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Seeking 4000 RPM Flat Spot Remedies

guzziben47

guzziben47

Cruisin' Guzzisti
Joined
Jun 5, 2010
Messages
191
I have read that the differences between the 2009 and 2010 Stelvio are a larger air box, different cams, and different mapping. I know you can't change the air box on a 2009, but if more air is the issue, I would think a high flow filter like the one's K&N make would help. In fact, I think I read somewhere that someone got improved midrange by installing a new filter. I'm not sure about the cams; I think I've also read somewhere that the parts fiche lists the same part number for the 2009 and 2010 cams. Otherwise, I wonder if you can just buy the new part and install it. When I got my bike, I also remember the dealer saying something about installing the new mapping, so I'm going to find out more about that when I go in for the next service.

Anyway, my question is, has anyone tried any of these potential remedies (or anything else) and been able to make a noticeable difference in the torque flat spot around 4,000 rpm?
 
guzziben47 said:
Anyway, my question is, has anyone tried any of these potential remedies (or anything else) and been able to make a noticeable difference in the torque flat spot around 4,000 rpm?
Click to expand...
No one has tried them because none of the parts are yet available to my understanding. If/when the cams are, it would require an ECU map update. On the air box, my open lid ring (shown below) is sure to superior as to air-flow, and my GT-Rx/PC-V fueling package will allow it to run to its full potential, completely eliminating any flat spots. I've done nearly a dozen+ Stelvio with this mod, so hopefully someone will speak up.

ArbxElim_G11.jpg
 
GT-Rx said:
On the air box, my open lid ring...
Click to expand...
Is this a stock item for you or do you take deposits for a batch order? I would certainly be interested if I can work out my other issues.

Coldcanuck
 
guzziben47 said:
I have read that the differences between the 2009 and 2010 Stelvio are a larger air box, different cams, and different mapping. I know you can't change the air box on a 2009, but if more air is the issue, I would think a high flow filter like the one's K&N make would help. In fact, I think I read somewhere that someone got improved midrange by installing a new filter. I'm not sure about the cams; I think I've also read somewhere that the parts fiche lists the same part number for the 2009 and 2010 cams. Otherwise, I wonder if you can just buy the new part and install it. When I got my bike, I also remember the dealer saying something about installing the new mapping, so I'm going to find out more about that when I go in for the next service.

Anyway, my question is, has anyone tried any of these potential remedies (or anything else) and been able to make a noticeable difference in the torque flat spot around 4,000 rpm?
Click to expand...

Flat spot?, what flat spot?

Remove the charcoal canister and associated plumbing, plug the two ports in the TB's with allen cap screws and ride.
 
I have Todd's PCV/AT, open airbox, and exhaust pipe all installed on mine. It works just like Todd says it does. I have no flat spot.
 
Coldcanuck, I do small batch runs on occasion, I'll post again here next I have some.

Thanks Ray R, can you elaborate a bit more on the transformation of the bike post-PC-V install(?)
 
It's been so long since I did the upgrade that I don't really recall how it used to run. I also have a 1200 Sport with the factory race kit, and the Stelvio runs just as good as that bike. The idle is steady. There is no decel popping. It just pulls like a tractor from down low in the RPM range all the way to redline. Just like a Guzzi should.
 
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