Dynotuned L33 (5.3L)/T56 disappointing (?) Results...

[mattster03]

Well I just got done tuning a friends L33/T56 Powered RX-7 and the results were a bit lower than expected... but maybe the expectations were too high? The car has an LS1 cam/intake/throttle body with Hooker Headers cast manifolds and dual 2.5" exhaust. We were really hoping for 300/300 on Dynojet. The best I could squeeze out of it was 270HP/275TQ.

I was able to make some good gains from starting with a super fat AFR and lazy timing. I made the best power with 12.8-13.0 AFR's and 24 degrees timing (799 heads). I have attached the tune and one of the 4th gear dyno pull logs. Does anyone see anything strange/suspect?

I am really suspicious of the Cylinder Air Mass values which were much lower than expected (0.3-0.4 g/cyl @ WOT) which caused the tune to pull timing values in a completely different portion of the timing table than I am used to with my car. What might be the cause of this?

Any input is greatly appreciated!

[mecanicman]

Your confusion on cylinder air mass values and where the timing is on the chart comes from failing the maf and running sd mode while still having the maf pid in the scanner. Delete the maf pid from the table and chart and look at where your timing falls again.

[mattster03]

Your confusion on cylinder air mass values and where the timing is on the chart comes from failing the maf and running sd mode while still having the maf pid in the scanner. Delete the maf pid from the table and chart and look at where your timing falls again.

Ah ok... that makes pretty good sense. So if I'm tuning in SD (which I am) it's still using the MAF values to calculate cylinder air? What should it be using to populate the timing table in SD mode?

[mattster03]

Any other comments on the tune or log?

[Hotwire]

I know, holy old posts, but checking to see if you were able to get anywhere on this setup?

I'm running a L33 w/ LS6 cam, have been running 87 octane for a while and have just started tuning 93 octane, can't believe the difference..