Using Excel to dial in your maf curve (meth users, perfectionists, etc.)

[Lex]

Nice curve fitting Rob.

Just be aware that on gen2 cars the WOT trims will make your car reach AFR targets unless you're off by more than 10-12%.

For safety reasons I would not scale my MAF for meth especially on a gen2 and let the ECU take care of it. If you're off by more than 10-12% then that's a lot of meth.

I assume this was from a gen1 car?

[rfinkle2]

Originally Posted by Lex Nice curve fitting Rob. Just be aware that on gen2 cars the WOT trims will make your car reach AFR targets unless you're off by more than 10-12%. For safety reasons I would not scale my MAF for meth especially on a gen2 and let the ECU take care of it. If you're off by more than 10-12% then that's a lot of meth. I assume this was from a gen1 car?

Thanks Lex. I understand what you mean about the ability of the ecu to trim fuel in open loop.

I've used it on both generation cars with great results.

The multiplier that I'm using is still based on the ol' long division to correct the curve, I'm then allowing excel to fit the curve based on those corrected g/s values rather than plugging each individual cell manually, or multiplying small groups of cells manually.

@Lex; ... # 3 in the OP is a better way to explain.

[86AmishMs3]

Good stuff...tis what I do too

[superskaterxes]

Originally Posted by Lex Nice curve fitting Rob. Just be aware that on gen2 cars the WOT trims will make your car reach AFR targets unless you're off by more than 10-12%. For safety reasons I would not scale my MAF for meth especially on a gen2 and let the ECU take care of it. If you're off by more than 10-12% then that's a lot of meth. I assume this was from a gen1 car?

when is cobb going to release these tables for us?

[rfinkle2]

Originally Posted by superskaterxes when is cobb going to release these tables for us?

Good question. I know DJ asked David about the maximum amounts of trim allowed and those tables to be exposed, but I haven't heard anything else about it.

[Cobb Tuning]

Originally Posted by rfinkle2 Good question. I know DJ asked David about the maximum amounts of trim allowed and those tables to be exposed, but I haven't heard anything else about it.

Still in the testing/experimental stage to make sure we have all the controls you need before letting it go out.

-David@COBB

[Lex]

Originally Posted by superskaterxes when is cobb going to release these tables for us?

Not sure if there is much in terms of development at this time. They have their hands full with the ST etc. I will inquire next time I speak with David.