GTM Fuel Kit - E5 V85TT Performance Mods & Dyno graphs and PC6 info

[MissouriDave]

Doing the install now as the weather is warm enough to work longer than a few hours.

Question regarding the connector "intercept" for the fuel injectors and throttle body. The male FI intercept from the PC6 mates with the female removed from the injector and PC6 female mates with the fuel injector? Same for the throttle body? The PC6 wiring harness in effect is clipped "in the middle" or "between" the stock male and female plugs correct?

 

[MissouriDave]

With regard to the stock muffler on the GTM headers and y pipe, it is as far on as possible and some rub with the rear foot hanger and sidestand. The muffler hanger also does not line up with the eye on the muffler, the muffler is about 1.6" or so back.

Does this indicate the Y pipe needs to slip up further on the headers? I measured the front of the y pipe where it slips onto the headers and that distance is 5" to the weld on the headers on both sides. What is everyone else's measure to?

Thanks.

 

[GTM®]

The PC6 wiring harness in effect is clipped "in the middle" or "between" the stock male and female plugs correct?

Correct.

 

[GTM®]

With regard to the stock muffler on the GTM headers and y pipe, it is as far on as possible and some rub with the rear foot hanger and sidestand. The muffler hanger also does not line up with the eye on the muffler, the muffler is about 1.6" or so back.

No. Pay close attention to side to side distances of the headers. Often people install them uneven side to side, and it causes the Y-pipe to rotate. Simple instruction is always loosely assemble all, inspect, rotate and move all to allow clearance and that it all looks correct. Then tighten. The headers should be true vertical looking from the front. The Y can be rotated on the headers to give proper muffler positioning. Yes you can push the Y further forward as needed. This is all by design.

 

[gmc28]

Anyone have the intel on approx db difference between GTM’s shorty and full length exhaust?
I’m in the “make it sound sweet but not loud” camp, and like the shorty but fear it’s probably louder?
I see they’re both back ordered, so gotta decide then get on back order list…

 

[GTM®]

approx db difference between the shorty and full length exhaust?

Both are full length mufflers, starting at the cone off of the Y-pipe. I have video on the shorty on IG I'll try to find and link (there's likely one here on the Forum already). The short is very decent at lower RPMs, louder as the RPMs build. Long is closer to most aftermarket with a db-killer. Long version sound is on the video in the first post here.

 

[Warnzie]

Hi folks, im in Japan atm, and will be back in a few weeks.

I will save the majority of the amazing results and feedback till I get back, as it needs that much justice and been on holiday doesn't give it what it deserves, but if you have a v85tt and were thinking, pondering, weighing up the $$ ECT ECT to see if your v85tt is worth it, deserves it, or more so you can love without the GTM PC6 fulling kit, I can without any hesitation or reservation absolutely recommend it and more so insist on it for your V85TT.
It goes way more than the physical components, it's the individual, personal and dedication from a individual that goes beyond the actual connection of hardware purchased that is the gold here folks...I CANNOT UNDERSTATE THIS MORE...you are getting personalised service, care and love for the brand, the product and YOUR bike in which for me personally, felt like his name was on MY bike and that his dedication and passion I experienced, and am still experiencing is unheard of and just mind blowing. I'm so taken back by GTM’s dedication and helpfulness. It's this stuff that is absolutely non existent in today's world, especially or more specifically in the moto world.
A more detailed review coming when back from Japan, but if the above hasn't convinced you, and just for reference and transparency, I'm a Aussie living in Queensland Australia, have never met GTM, just a v85tt owner who appreciates his machine, GTM’s expertise and products based on my purchases from him then please wait to hear my thoughts soon

 

[Warnzie]

Ok folks, recently back from Japan and now have the excitement of giving a real life and honest review of the PC6/AT300 setup from GTM. There is a unknown, maybe more so for some reason a un-told element to this whole setup that isn't ever talked about here. Why i don't know? It does perplex me as this element of this setup is where the magic happens, and more so where the owner and developer of the work we benefit so greatly from comes into its own. Suffice to say, i think you may of guessed this element from my post above.

Im not going to go into the install ect ect as that is more than clear on this thread, i can say from that element GTM’s instructions where clear, concise and more than easily followed. You would have to purposely want to do something wrong, as everything just clips / clicks into place with either a male / female end so you get the point

I could go into so many avenues but the important avenue, that is most sought after from a review perspective, is the, "How does it compare"...So mates, here we go, you asked "How Does it Compare"

HOW DOES IT COMPARE:

Lets use a v85tt with a Upmap map installed as our basis for comparison. That was my v85tt before getting GTM’s setup. The real and honest fact is, and this is not to offend anyone that is running as so, the stock v85tt tune is horrific at best, which is solely based on emissions, constraints, hand ties that are mandated by authorities ect ect. Enough said on that, no argument there hence why i wont use a stock bike as comparison, which i obviously did have at one point in time...and seriously, the majority if not all who are interested in gaining more enjoyment / performance from their v85tt have already made modifications which would most likely include a upmap map, so think its more than fair to compare from this angle, and as you will see, the difference is as the east is to the west with JUST a upmap map

 

[Warnzie]

My mods on my v85tt for reference are as follows;
- Verex Headers (Aussie Tasmanian Headers with bigger bore size over oem)
- Mistral muffler
- BMC airfilter
- Airbox lid modified to GTM suggestion (Large bore hole in centre, slits opened up)
- GTM SAS block offs
- Evap mod
**** IMPORTANT, valves set to Inlet 0.15. Exhaust 0.20 **** These clearances alleviate the pinging that this small block suffers from

and of-course a Upmap Map / Device and GTM’s PC6/AT300 setup of recent

So, lets cut this review into 2, what my bike was like with JUST the upmap map, and then with the GTM’s additional PC6/AT300 setup

Pre PC6/AT300 Setup

- My bike had the above mods, sans the airbox lid mod when i purchased a upmap device and associated map. I have a few posts here on GT that mention and ask for experiences of others in relation to flatspots, surging ect that i was experiencing. No doubt, it was a improvement in performance over stock, but it certainly wasnt perfect and the surging and fuelling issues i was expereicing were so bad i bought the lighter mod upmap map just to be able to have a behaved bike...Giving it the berries and more than 30% throttle resulted in overall a well behaved, enhanced performance bike, but anything under the fuelling was terrible. As one who uses his bike for communting and running errands, this was a big disappointment for me making riding arduous in traffic conditions ect . I would like to point out before a get slapped, this was for My bike and MY mods in MY location here in Australia, im not in anyway saying those that run a current setup like this are riding horrific fuelled machines, but i can tell you now without any doubt of a word, the upmap maps compared to GTM’s setup is so far in comparison, im struggling to find a example to show the difference...I dont think as chalk is to cheese gives it the justice it deserves...you get the point. If your bike is currently running fine with an upmap and you have no complaints i acknowledge and respect, and more so congratulate you on finding that balance, but mates, if you thought that burger without the cheese was great, you REALLY do need to try the burger WITH the cheese - GTM’s PC6/AT300

 

[Warnzie]

PC6/AT300 SETUP

The difference in running with this setup is just amazing. The first thing you will experience is just how smooth the engine will become and idle. Then you will find after the first take off is just how creamy and buttery the fuelling is...its astounding in comparison. The pull / torque of the engine across the rpm range, more so noticeable in the everyday running range makes riding the v85TT a pure joy and more so engaging experience. If you had any doubts of your purchase of a v85tt, we all know that "maybe i could have more power", or the "it was fun at first now i just wished", all these things are now washed away, it REALLY is that good lads. The bike is totally transformed, and not transformed in a arm ripping, unfriendly over bearing overpowered bike that will now make you second guess what you have done, it REALLY is a transformation of motorcycling bliss. The power spread you will now enjoy, the torque curve which gives you everything and more throughout the rpm range now, so much so its absolutely effortless to pass by that car as quickly as you want to dodge the booger they have rolled into a meatball sized ball and flick out the window just for us to ride straight into its path. The mechanical sympathy you have enjoyed with just owning and experienced from riding a v85tt is now enhanced to a beautiful perfection. It really is like your engine is saying thank you thank you thank you.

No more extreme engine temps, it now runs very cool in comparison which, logically and without argument is sooo much better for our engines but more so for longevity and reliability...Top end pull - 6,000 to redline (8-8500rpm) is magical, To think we have a setup with a aircooled, pushrod 2 valve engine to perform like this up to is mind blowning. The pull and accelaration is night and day in comparison to before, with exceptional power and pull from the 3500 - upwards where our riding and everyday matters. THERE IS NO COMPARISON to before with just my upmap map and mods.

It uses more fuel. you ask??? Well, any smart thinking human being would recognise more fuel = more push and shove..our bodies work the same way and we recognise that...so the logical answer is...Yes it does use more fuel. But how much more so? Before i was averaging 4.85lt per 100km - sorry to my US mates will leave you to work that out in your strange imperial ways now im returning 5.0lt per 100km - hardly a scratch mates...this is genuine and true and these measurements have been when using my new founded throttle. Im yet to take for a extended touring ride which without a doubt will yield lower or more so very much the same milage.

So, its got more power, more torque, runs better, runs smoother, runs cooler, fuelling is creamy smooth, its an absolute joy to ride and now effortless in every way, everything just gels together harmoniously to provide pure riding enjoyment in comparison to before, is this where things stop??

 

[scott_m]

I have said this at least 100x over the last 13+ years.



Welcome to the True Believers Club!

Best money you’ll ever spend on your motorcycle, eh?

 

[GTM®]

So, its got more power, more torque, runs better, runs smoother, runs cooler, fuelling is creamy smooth, its an absolute joy to ride and now effortless in every way, everything just gels together harmoniously to provide pure riding enjoyment in comparison to before…

It’s an astonishing difference on all bikes that this system is installed on. My GTM builds likely wouldn’t run at all without it.
But I’m just a salesman selling a bill of goods (according to the ignorant, misinformed and all those blindly using things they are told work that don’t) when I post on it, despite me personally enjoying it on all of my bikes since 2001. So thanks for your words!

 

[Zool2]

Warnzie's truly excellent review above has inspired me to write my V85tt story. I hope that my words can be valuable input not only for someone considering the GTM Upgrade but also for someone who may be just beginning to consider the V85. I'm an older rider, my last bike was a Triumph 650 in early 70's. I didn't know much about Moto Guzzi, but the V-Twin, shaft drive, craftsmanship, tradition and styling became alluring. I watched tons of video reviews of bikes, read everything I could. And it became apparent, this Marque is special. Many times I read an account from someone with a stable of the best bikes, or who had owned many of the best over decades, and they would point out that when it came to rider satisfaction, the joy and passion we feel, that the Moto Guzzi was right at the top!
Once I got used to riding again, I soon bonded with the bike. Clearly a keeper. But a bit to my surprise, I did feel, in certain situations, a wish for more power. I wanted the overtakes to be somewhat snappier.
Last year I installed GTM’s complete upgrade on my 2021 V85 Centenario. GTM Exhaust, Upmap with the Dbkiller Map, PC6/AT300, SAS delete, Airbox mod.
I completely accord with everything Warnzie has said! It's truly transformative and this goes beyond just acceleration. There is a feel to this bike, the response, the sound and vibration, we become exquisitely attuned to these things. The V85 is addictive in it's feel. And it is so sensitive to rider imput that to me the handling feels effortless, even telepathic. I believe that this may be related to the longitudinal crankshaft orientation. Which means the shaft drive has only one bevel. It's a brilliant design that's executed with great refinement, considering all the numerous design geometry trade-offs involved in the engineering.
Now imagine all this but now the bike is fuel corrected. Perfect tune held in steady state. The response is so alive, so smooth, so excellent in all gears and across the power band. The vibration, it's creamy! Overtakes? Very satisfactory! Sound? Awesome, but not obnoxious or ungodly loud. Grunt off the line is at another level, it yanks my arms. With the new exhaust and lithium battery the bike becomes 40 lbs lighter! Wet weight is now around 470 lbs, perfect.
It runs so much cooler that after a spin I can put my hand on the cylinder heads! I installed all the mods myself and I'm not a pro, I'm a YouTube mechanic. Yet I still have maintenance autonomy with oil changes and valves. It's a simple, air cooled engine, only 4 valves and all so accessible.
A fuel corrected bike is something you feel every minute you ride it. If we are limited to one motorcycle, as an all-rounder, a V85tt as sorted out by GTM is very hard to beat. Because its a balance of perfection. You can't buy this bike in a store. Beyond this point, diminishing returns set in very rapidly. even if money is no object. The Zen of it all is easily lost! So, I ask the same question that concluded the preceeding review, 'is this where things stop?'.

 

[Zool2]

Just got back from a 700 mile trip. Lake Nipissing MG Rally, for two days, then Trans Canada past Sudbury, cross the twirling bridge to Manitoulin Island, then the ferry to Bruce Peninsula. Vistas so picturesque, it is motorcycle paradise which is a consolation for the high insurance rates and high costs of everything here.
So, right before the trip, I received an updated map from GTM. I was actually surprised at the result. My GTM V85 is really torquey everywhere but now once it hits 5k, it just surges, as if it hit some kind of afterburners. Todd says next time I should not wait 15 months to send in a new map.
Now here is the daunting problem I face. I am limited to owning one Moto Guzzi. My interest in other brands is very minimal. Guzzi is unequalled smiles per miles. Cost, limited garage space and wife acceptance factor conspire to put a V100 Mandello out of reach for now. Strategic thinking is required! My solution is the GTM V85tt. Which I believe deserves its own review. Like we used to talk of a 'Shelby' Mustang. Something in a different category.
Now in my case, my natural freeway cruising speed is 75 to 80 mph. If that figure was 90+, then a V100 would be mandated. I am 95/5 with dirt roads and trails so Adventure bike versatility is the ticket. I treasure air cooled, shaft drive simplicity, and maintenance autonomy. Also lightness, so am quite averse to weight getting much over 500 pounds. My GTM performance increase (>25% hp and torque) plus lithium battery/-25 mm new shock = a net weight reduction of 40 pounds (= 5 hp?) and more manageable lower center of gravity. At 5' 8.5" am now flat footing it.
The retro design language, the long driving range, perfect ergonomics and overall "friendliness' of the GTM V85tt means I can't replace it. It is my first choice Guzzi configuration. Yet I do also covet the modern version, the Mandello. It's gorgeous and at the Rally I chatted with a fellow who had the S version. He loves it. Said it's a 'dealer bike'. Meaning, 'don't be messing with the valves,' VVT and all. Well, I hope my words might be helpful to others who view the V85 as the ultimate all-rounder/keeper. Yes, the GTM Upgrade is over $3k in parts. For me, it's so worth it! The way I see it, it's like getting a whole new engine! Seriously! Its not just the gear, its the wisdom that comes with it! Now, here is the deal: Todd's fuel correction package makes the bike way more engaging to ride, not to mention the now snappy overtakes. I think this cost is very reasonable as translated to long term owner satisfaction. I hold that this is cheaper than trading in for new ones. My guess is that perhaps 1/3rd of V85 owners wish for more power. I did, but not anymore. Was just reading on the UK V85 forum, there was a thread, about a dozen guys who had replaced their 1250 GS with the V85tt and they all reported being happy with the change. Well, if only they could experience the GTM V85! When I was waiting for the Ferry, the bikes were first in line. One fellow had a 1250 GS, a great machine for sure. But when he started it, in ten seconds I knew I could never fall in love with that bike. That offset MG V Twin sound, it rules! (Yes, lose the stupid cat). It sounds delicious.
Even if we could have a stable of bikes, we can only ride one at a time. More is not better, there is always the onset of diminishing returns. Here is an ideal balance of weight, power and agility. If my bike gained even more power, it would begin to lose it's 'friendly nature'. I give it the beans all the time. It's pure joy.! But that's not the case if we are in any way intimidated by the bike's ferocity. And other consequences begin to manifest. Like traffic citations, burning through rear tires and ever more gas consumption.
I'm writing this because I believe there are others who will feel the same. This GTM V85 is something really special. It's like it's transparent. So many times on this trip I had that feeling, you know, like those dreams of flying.

 

[Zool2]

I just took the plunge and purchased the whole setup for my ‘21 V85TT: full Werks exhaust kit + full fueling E5 kit + K&N filter + SAS evap!
Looking forward to a cooler running engine; linear acceleration without gaps; the beautiful Werks long exhaust. It was difficult for me to judge “how loud” the exhaust will be. Hope not ‘annoying to passerby’ loud.
It’ll be at least 60 days before i get it here in Bolivia because sending it all via air would be too expensive.

It's awesome, I think you will love it! This is my 1st experience with aftermarket pipe after stock. Sudden change for me. GTM pipe is similar to other such mufflers, I would say. So I got a dbkiller off of Amazon for about $15. That reduced the sound level at least 10 db. Now the sound is great. Dbkiller power loss was barely perceptible. On the highway wearing my earplugs I hear it just a bit. A startup it sounds somewhat loud but not obnoxiously so. I have same year bike and GTM upgrades as you have. I purchased before the GTM BT FT option, so I'm using the Upmap T800 for the y pipe exhaust with dbkiller. GTM Stainless steel design looks great.

 

[Zool2]

@Zool2 thanks for your encouraging comments! Now to sit still and wait ‘calmly’ for 60 to 90 days!
I have a friend who has a bike shop where he runs a dynamometer. An Argentine product, forget the brand name. I plan to run a pre and a post GTM reading on it. So I should be able to report back here (in several months time…) on the improvements.
I have to admit to reacting worriedly to your opinion on noise levels. I’ll discuss it with GTM and see what he recommends. I did not buy the Upmap and instead got his newer AT (AlienTech) option. Hope the AT option also provides a map that allows for a DB killer.

I don't think there is any need to feel worried. For GTM, I believe it's just a tweak in the fuel tables. Me personally, I don't like really loud pipes on any vehicle. To me that's obnoxious. Even racetracks set limits. But, the way I have my bike set up, it sounds much better than stock. Stock is too quiet imo. Mine is a bit louder though but not at all annoying. Now it sings in a way that I find really pleasing. I do wear earplugs unless it's a really short ride. I have set the dbkiller in the most open position and it's perfect.
You are in for something really good! I am over the moon with my GTM V85tt! My rider satisfaction keeps going up! Seriously this has exceeded my expectations. MG V85tt + GTM, there is a real synergy here. The whole exceeding the sum of the parts. I believe there are hundreds of V85 riders who, if they tried my bike for a day, would get out the Visa Card and order the parts from GTM forthwith!

 

[GTM®]

Sound: Everyone has an opinion. My exhaust systems are built to dyno-proven results. My “long” muffler in this case has over 22” of sound deadening core and steel wool packing, starting at the connection to the Y-pipe, along with my design of a db-killer. It’s a really good and moderate sound, in between most aftermarket mufflers with and without db-killers. My shorty version is louder, but still has 16” of sound deadening, but of course it makes more power. I sold just one, and he loved it. Please don’t let the above words scare anyone off. If you want quiet, you can run my E5 headers and Y, with the stock muffler. Dyno results are down considerably with it, but that’s the trade off. I grew up riding and racing in the 70’s, 80’s & 90’s, so I know loud. NOTHING I make is loud, compared to any open pipe HD that permeates every town, everywhere I’ve been. End.

 

[Zool2]

I have a 2021 Centenario. I believe it was created with an extra measure of Testosterone. That's why it was a bit louder at first even with the GTM Long Muffler.
At first I couldn't understand the importance others attached to the sound of their pipes. Now I do. It sounds awesome and it's a really important part of the whole mix to me now. Also, I'm a musician. So possibly more sensitive than most.
I see on YouTube that interest in Moto Guzzi is growing fast. For those who have the passion, everything is here on this thread to take it to a much higher level. Spread the good word! Art, science, experience and dedication all converge here backed up by dyno results. Why piss ass around with these idiotic booster plugs? This here is the real deal. And saving a few bucks on cheaper exhausts is a false economy. The system is holistic, it's tuned to work together. Looking forward to hearing from others getting these great results!

 

[GTM®]

I have a 2021 Centenario. I believe it was created with an extra measure of Testosterone. That's why it was a bit louder at first even with the GTM Long Muffler.

EVERY bike is louder with ANY aftermarket full system compared to stock. It’s a drastic and sudden change to anyone who spent time on a stock system. My full system long is quite mellow to me, especially compared to my fire-breathing GTM builds. Glad you found peace.

 

[Zool2]

EVERY bike is louder with ANY aftermarket full system compared to stock. It’s a drastic and sudden change to anyone who spent time on a stock system. My full system long is quite mellow to me, especially compared to my fire-breathing GTM builds. Glad you found a happy medium.

I actually have really sensitive hearing. I guess over reaction on my part. And really there's no issue, perhaps most won't need to bother with any dbkiller. Its not Harley Davidson loud! And with dbkiller in the performance change was so slight I barely noticed anything. So bottom line, there's no problem here at all. If a dbkiller is used it only costs $15, install or de-install in a few minutes. Season to taste!

Update: I bought the Sound Meter App on my phone. Wheeled the bike into open space. Two feet away, 45 degree angle.
Measured Result: 89 db idle.