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Posted by kiddsm95, May 7, 2010
Tuning & Engine Management - 4G63 EPROMS, ECU, MAF, knock, EGT, wideband, datalogging, fuel trims, etc. Read this Forum's Strict Guidelines.
You can recreate "Lean Spool" like the Evos have, run 12.5 AFR during SpoolUp, then 11.0 AFR at WOT. (Or whatever AFRs your car can handle)
You only added timing to the low octane map? I thought the intent of the low oct map was so the car can revert to it for safety reasons. Please do explain.
So lean AFR's at spool up, and leave the timing as is?
I myself dont look at the spool that much but more of what makes more tq. I hit around 17* when boost starts to build and slowly rises to around 22* at redline. My car seems to love it. The minimal difference you will get from tuning is not going to be enough to really notice the turbo spooling faster.
There are many different theorys/practices for AFR tuning.
For a Lean Spool type of map:
Idle - 14.7
Spool - 12.5
WOT - 11.0
This replicates the Lean Spool feature the Evos have had since the Evo5.
I think the theory behind it is by running lean you have more power and faster spool, but since it is only for a short period of time it won't heat things up enough to cause knock, and the rich AFR at WOT will cool things back down.
If you can add more timing with out knocking during spool up, it will help. But you want to aim for zero or very low knock. If you start knocking during spool up it will cascade into the rest of the pull, and you will start to bog out from pulled timing and it will ruin the whole pull.
You should keep the Low Octane map stockish, as a safety feature in case you get bad gas, have a bad tune, or heat soak your intercooler or something.