Getting different AFR's in different gears ? Why ?

[J 98ta]

I just got an LC1 hooked up last week, and did some AutoVe tuning, then went to the track this weekend. I love it, but have a question.

The tune is still an auto VE tune. I cannot seem to get the afr to be the same at WOT in all gears. Seems like the car likes to get rich over the course of a run. 1st gear will be Low 13's 2nd gear will be mid 12's and 3rd will be low 12's in AFR. Why ? I try adjusting the VE richer, and well, it works, gets richer for 1st gear like I wanted it to, but then so does everything else. Seems linear.

Thanks, 'J

BTW: Went 11.58 @ 117

[LSRacing]

WOT is controlled via the PE tables. The VE tuning is only for idle/part throttle driving. Get the idle and part throttle driving right with the auto tune and then go to the track and use the PE VS RPM table to make corrections at WOT.

Jamy

[J 98ta]

Thanks for the reply. I guess I was not clear enough in the question. Given an RPM, say 5600, at WOT it, (the WB) will display a leaner AFR in 1st gear, then be richer in 2nd and more so in 3rd. The graph will slope downhill over the run. I am trying to understand why this happens, so I can attempt to get the same AFR in each gear given the same RPM.

'J

[jfpilla]

Thanks for the reply. I guess I was not clear enough in the question. Given an RPM, say 5600, at WOT it, (the WB) will display a leaner AFR in 1st gear, then be richer in 2nd and more so in 3rd. The graph will slope downhill over the run. I am trying to understand why this happens, so I can attempt to get the same AFR in each gear given the same RPM.

'J

Have you tried disabling cat overtemp?

[J 98ta]

Thanks for the reply.

I just double checked my file. I have B0701 set at Disable. Maybe there are other places I need to change ?

I did notice this before this weekend. But it was with stock type narrow bands, and did not think too much of it.

'J

[LSRacing]

Have you logged the map values at those given rpms to see if maybe you have a diff map value in 1st than you do in 2nd etc... That would be where to start.

Jamy

[J 98ta]

Thanks for the reply, again.

MAP is between 90-100 during the run. It usually bounces between 92-97. No real difference in MAP between gears.

'J

[J 98ta]

Here is a screen shot if it helps.

http://j.cz28.com/1161-at-1174.jpg

'J

[GMPX]

Is this running in SD or do you still have the MAF?.

Cheers,
Ross

[J 98ta]

SD, actually still on the AutoVE tune. --> The MAF is still physically there, but is positively not plugged in.

'J