JUSTA4 -Matt

What I mean is, does this work even with non stock applications. I am testing a custom set up with aftermarket injectors, fuel pump, fuel rail, pressure regulator, maf.

I was wondering because I am getting weird numbers and thought it maybe applied to stock part or something?

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A different/bigger MAF would be an exception and air/fuel
ratios would probably be different.

JUSTA4 -Matt

I understand the ratios are basically the same and optimal tunning is 14.7:1 in most cases. I was asking about the formula used to derive the ratio in the Ross-Tech link. They use assumed values and flow rates in both the MAF and injectors. I would imagine its a different formula if your car has all of those flowing differently.

scroll down to "Some Useful Off Site Links"

I used the HP vs. TQ spread sheet and got some very accurate numbers for my K03 with my mods as far as I can tell. The guy that made it was only off by 4 hp when he dyno tested and used his formula with Vag-Log info. I pulled 185.5 hp / 219.9 tq. Using that method. If anything I bet I can get slightly more because I can beat a K04 car that pulled 200whp on a dyno. Plus my car only hit 14 psi during the logs. I ususlly hit 16-17 steady spike 18.<ul><li><a href="http://www.ross-tech.com/vag-com/cars/index.html">http://www.ross-tech.com/vag-com/cars/index.html</a</li></ul>

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You can definitely expect to see a different pattern (as you
suspected). I would keep a close eye on Air/Fuel ratios
as I think therein are some basic guidelines you want to follow
such as never going below 10.3 or above 17.5 or something...
I just threw those numbers in there, but I'm sure there is a
spectrum of specific air/fuel ratios you'll want to stay very close
to for optimal tuning as well as keeping things from going boom.
I don't know what those numbers are, but I'm sure if you ask
around you'll find out. You may even want to contact a
tuner/vendor such as APR or GIAC for that info if you can't
find it here.

As far as finding, or deciding upon a specific pattern such as
injector duty cycles and how they mesh with A/F ratios at 2k,
3.5k, 6k, rpm's is completely unknown for your custom setup,
but I'm sure as you continue to log you'll notice a pattern(s).

Also, you may be better off running a stand-alone boost
controller if you are swapping out injectors, so that you can
somewhat tune your car if so wish to go further down
that road.

JUSTA4 -Matt

The guy that I am helping with this can not afford a air/fuel wideband right now and its just silly that he spent so much money on his car and didnt budget for this but still drives the car around. I mean its fully built from the bottom up with everything. His goal is 500 which I see as long reached. So needless we have no reference on where he is running right now. Thats why I have been doing this.