at wot the a/f is at 10.00 to 10.3

should i take some fuel out.. or add some timming to bring this to a better level?


thanks

 

10 is way rich. For safety 11.8 to 11.3 is good and makes more power

 

Er so just take fuel out, don't add timing

 

I would datalog and find out what a/f ratio the PCM is commanding. If it's commanding 10:1 then take fuel out. If it's commanding a leaner mixture, you need to get your MAF transfer function corrected. Taking fuel out might make for some dangerous lean spots, if the transfer function is off.

 

+1

most issues are located around the Maf transfer function and most tuners dont know how to adjust those tables correctly. optimal a/f varies with timing, CHT, and what boost pressure you are running.

 

What is your timing at now?

 

10.3 is too rich you need to be around 11.5-11.8 for a nice tune. Anything over 12 is running lean and anything under 11 you are too rich. Be very careful if you are tuning it yourself...change the numbers in small increments.