Last night we began doing some tuning on a friend on mines LS/VTEC T04E 50 trim setup. This is not the first Crome tune I have done, so I figured it would be simple enough.

Well, we get to the WOT tuning and we run into a problem, and this is where the question lies.

When I go wide open from 3000 up, the map goes fat (below 10:1) from 3000 until the VTEC crossover. Once the VTEC crossover occurs, the map is nailed with a consistent 12:1 AFR.

What I am wondering is has anyone ever encountered this before? I have tried changing low cam/high cam fuel tables under the specified loads without change to the AFR. I have also tried messing with the multiplier tables without change.

Any help is appreciated. Thanks!

 

are you using pro to datalog a/f or are you using a separate datalogger?

 

We are using a tailpipe sniffer to see the A/F ratio