Motec M48 - A/F ratio values

[laza]

Hi! WHat should be the A/F ratio values for my rallycar? full charge (1.6/1.7bar) from 2000rpm to 6400rpm? Assuming that: 36mm restrictor , 2.3hks stroker kit, evo 8.5 tme turbo, bigger fmic.We have an average 14 kilometers Special stage, 28°c
I am not sure because now I am running 12,5:1 A/F (I've made all my statements with an innovate motorsports LM1) and I would like to have your opinion.Too conservative?not enough?

Thanx for your help.

[miller153]

12.5-1 sounds a bit on the lean side i would of thought you wanted nearer to 12.0-1 afr or high 11s but then again you only need to run a richer mixture to cool the pistons to eliminate det so if the engine is not detting then the mixture would be ok. Then again though if you richen the mixture up you might be able to run a bit more advance on the timming which would get you more power.... but i might be wrong