new commodore

Hi,

Have u ever tuned the new commodore before? When I tune them on dyno, they made more HP, but on street! They got beaten by stock ones in the 3rd gear (auto) any idea what is going on?? Note, in the 1st & 2nd they are ahead, and then get beaten.

thx.....OB

Post some tune/log files.

here are the modified tunes and some logs with changes, last one is the one for the tuned file (log#5).


Attachment 5139
Attachment 5138
Attachment 5137

here are the stock ones

Attachment 5141
Attachment 5140

...

please help

I looked at the files, but I don't know the answer.

I will have the car again today on the dyno, I will log the 1st, 2nd, 3rd trans. what do u recommend??

Your timing doesn't really look to optimal to me. I'm hardly a 6.0L expert but I can't understand why you would progressively pull timing at for example the .84G/cyl column as RPM gets higher above 3600rpm all the way to the limiter. Sure pull a bit at peak torque.. But you have to raise timing with RPM as the ol bang process tends to need more time to do its thing the faster the engine goes.

do u think I have problem with AFR, the engine doesn't accept (+) timing. If I shoot for 12.2 ~ 12.5 the car knocks a lot with stock timing.