Lambo-Bully

Driving this morning I noticed some specifics:

All of this was in "stage 2", at roughly 1.45 bar.

EGT's seem fine until just before 5k rpms, then they shoot up really quick (along with the power!). Stoich stays rich, but we're still going to compare that with vag-com this weekend. Current plan is to swap in 450cc injectors, install apexi super afc, and adjust from there to see what it does for us. Seems that the current 310cc's can't keep up once the rpm's get too high?

xr4tic

310's will not cut it. I'm surprised they even worked up to 5000 RPM.

450's? or 440's? or 475's?

FWIW, I had my Ford 42lb/hr injectors flow-tested, and they flowed 450cc/m @ 3 bar.

Audi2ptzero

even with just the K04. I guess his 310's might make it to 5000 rpms if he is running a 5 bar fpr.

johnAWD

That's the consensus. What are you reading A/F ratio with, and what are the A/F numbers, before and after your EGTs start climbing?

Also, realize that the OEM O2 sensor isn't a tuning device. It'll give you O2 sensor voltage (and a fairly rough idea of AFR), but it doesn't have enough resolution for truely tuning. If you are pushing the car that hard, invest in an in-car wideband O2 sensor.

Power is most likely going up because you are running so hot. Like I said earlier, the car will never feel as powerful as it does right before things start to melt...

What exactly do you mean by "in stage 2"?

SMOKINA4TURBO

and still work fairly well to even 7K.

It was on the freeway in the higher gears,4th and 5th that it would drop dead on its face. When I had 310's I was suppose to keep it at 1 bar and I found myself cranking it up to 1.4 bar because of the addicting power.

He needs to make the hop to the bigger injectors as thats where the power really gets crazy.

Thanks for flow testing them btw...always nice to know exact #'s.

xr4tic

I had them in my car with the K03 chip running 1 bar, and it was still leaning out at the top end.

sw20T

You injectors are too small for the amount of power you should be making at that psi.
Don't forget to look at your timing maps considering your increased CFM and boost.

A crapy thing about a AFC is that on air flow equiped cars it tricks the ECU into thinking there is less load on the engine than there really is when you lean out the injectors (as you will with 440cc+). The ECU in tern bumps up ignition timing to compensate. This can spell disaster on bosted engines.

High EGT's are not only caused by a lean A/F mix, but can, and often are caused, buy timing that is too advanced , or too retarded.

aaron/sw20T

Audi2ptzero

boost down to 18psi where the chip is actually tuned for 27+ psi.

Also you have to understand my compression is only 8:1 and I have no problem running 20+ adv timing even on 91 octane. I can even run my 91 octane on 87 or 89 if I wish to.