Stelvio/Guzzidiag - Temporarily Disconnect Power Commander

Paul, I'm using my LC-2 to trim my Arrow/Mistral exhaust. I've configured the LC-2 narrowband output to my ideal AFR and it's working very well indeed.

Doug, the 2-lambda maps won't work with a 1-lambda bike. I can send you the latest 1-lambda map if you like.

Beetle, what settings do you use to get the analog signal out of the lc2?

Pete Roper wrote:

To the best of my knowledge there is only one roller cam profile. (The Cali 14 May have a different one, I'm not sure.)

Also the idea that cam profiles changed with the flat tappet models is a misconception. Yes, when the A5 engine became the A8 the part # changed and it is commonly assumed that this was because the profile was changed. The thing is that is what it was, an assumption! If you actually go to the bother of graphing the profile you'll find it is identical on all models and engine series up until the advent of the roller engines, (With the exception of the 1200 Sport 8V. I have no idea why! And perhaps the Norge, I haven't graphed one of them.). The reason the part # changed is because at that point the factory started shimming the camshafts for end float and the shaft, not the lobes, is machined differently to accomodate the shims.

As for how closely the roller cam profile mimics the earlier flat tappet lift and duration I'd have to guess that the answer would be 'Pretty closely'. Why? Because when you rollerise a 1200 Sport, which as mentioned had a 'Stand alone' cam profile, it gets the same parts as any other roller converted bikes and consequently it has to be re-mapped. In the service bulletin about the swap a great palaver is made about the 'Special map' that has been developed for this conversion and how it must be uploaded after the engine has been rollerised. Only thing is if you look at this 'Special Map' it is in fact just the same shitty map they used in early 2009 Stelvio'Stelvio! What a crock!

Given how sensitive the 8V motor is to even small changes to lift and duration my guess is that the map you were running before will be just dandy but given that Mark and I are going to be rollerising both our bikes soon I'm sure that one of the first things he'll do is go into hyper-nerd-frenzy mode and build a completely new map to compensate for any changes!!!

As it is I have some more information to impart about exactly how sensitive the 8V is to profile changes that I'll explain in another message after the weekend.

Pete

That is interesting. It's amazing how many people have told me that the low and mid range grunt is so much better on the new Stelvio's because of an improved cam profile designed specifically for that. I've never found the low and midrange bad on my Stelvio anyway. It's become sort of an urban legend of why not to buy the earlier Stelvio's.

Quote :

Fri Mar 20, 2015 4:03 pm
Doug, the 2-lambda maps won't work with a 1-lambda bike. I can send you the latest 1-lambda map if you like.

Definitely like to try out the most recent map when I get my rollerized bike back this week. Thanks!


Doug

after first year the airbox changed a lot. ANd because the hum in the pres, guzzi has told they changed a lot of things. Just like the bullshit they told when they mounted 2 lambdas

Well, if one is good, two must be twice as good, right?



Shaun

Well it certainly makes it a lot easier to get the delta map right!

Pete

Certainly, especially important on a GRiSO. Just curious -- is there much of a delta with the Stelvio, or other bike with symmetrical exhaust?

Cheers,
Shaun

Yes. Only the headers are symmetrical. There's a collector (or Y-pipe etc) instead of a pretzel for the other 2-into-1 zorsts for the Stelvio and Norge, and a horrid great cat box for the Sport. A delta map is necessary.

Good to know. Thanks, Mark.

pauldaytona wrote:

Beetle, what settings do you use to get the analog signal out of the lc2?  

Paul, sorry I missed this. I have analog out 2 configured for lambda as 1.1V=0.83 and 0.1V=0.87