is it possible to be TOO lean?
Thread Starter
Joined: May 2004
Posts: 1,080
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From: Elgin, Illinois
is it possible to be TOO lean? it seems im around 13.5 ish WOT afr this season so far. But I have no KR to speak of. Im down on power some (et and mph down) after an ls6 intake swap and was wondering if maybe the leanness is part of the problem.
Thanks
dave
Thanks
dave
Just because you can run 13.5-1 A/f with no knock doesn't mean your making the most power you can for the track which is probly what your seeing. We found that most of the cars like 12.5-1 A/F to run there fastest times 
Thread Starter
Joined: May 2004
Posts: 1,080
Likes: 0
From: Elgin, Illinois
well i went 11.7@118 last year w/ an ls1 intake at 13.0 AFR. now today i went 12.1@115 w/ no other changes but ls6 intake around 13.5 BUT im using a new LC-1 (had an LM1 last year) DA was MUCH better today too.
Dave
Dave
Originally Posted by TT_Vert
i certainly will richen it up some. i just need to get this lc1 to quit bouncing around so much at wot.
dave
dave
Otherwise, you may have an exhaust leak upstream of the sensor...if you do, your readings cannot be trusted. Even a small leak from my band clamps caused reading errors - I fixed it by moving the sensor to my header. The only reason I knew it was a leak was because idle would show some very erratic results (on the lean side).
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Thread Starter
Joined: May 2004
Posts: 1,080
Likes: 0
From: Elgin, Illinois
its still set to instant, i just need to slow down the sampling rate some. its pretty much dead nuts w/ my commanded AFR its just that it looks like a switching o2 right around the commanded AFR which is probably good and just a high sampling rate issue (i hope)
Dave
Dave
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Originally Posted by TT_Vert
and i have a stock exhaust system w/ the bung welded in front of the DS cat, no leak.
Dave
Dave
