Want a Critique from Predator Gurus
First of all, I want to thank everyone who contributes regularly to this forum. I have owned my 04 A4 GTO since 3/31/05. This forum (and the search function) has been valuable beyond words to me over the last 6 months.
I have driven around with the Predator tuner watching the live data function for several weeks. Using the advice of many of you in this forum, I constantly tweak settings.
I'd like all you Predator gurus in this forum to give me a critique of my settings and tell me if they're good, bad, or ugly, and see if there's any room for improvement.
First off, I have only 3 modifications on the engine thus far that would have a bearing on these readings. I have a 160* thermostat (the engine runs 181 to 185) and a Speed Induction Intake with 9" K&N cone filter. (This is similiar to the New Era intake...it has NO heat shield. I plan to put a Lingenfelter intake on it this Winter with the enclosed shield) I have also re-located the IAT sensor to the lower edge of the inside of L.F. fenderwell where it gets close to the ambient air stream. The exhaust system is stock. I only run Shell V-Power 93 (yea, I'm a sucker for that "top tier" gas thing).
My tune is the standard Predator Performance tune with the following tweaks:
LTFT is +3 to +5 at an idle to 2000 RPM's (indicating I'm lean at low RPM)
LTFT is is -2 to 0 at WOT and anything above 3500RPM's
STFT is all over the place in normal driving, but is also 0 at WOT
My O2 Sensors read 450 to 700 in normal driving and flucuate wildly, but all 4 sensors lock on
920 to 925 at WOT.
On sudden WOT I'll get an instant of KR at 0.3. The most KR I've ever seen is 1.7 and that was just for an instant. 99% of the time it stays at 0.0
My timing varies from 15 to 32 degrees in normal driving. It locks on to 24 or 25 at WOT, but will back down to about 22 in an extended WOT run. (I suspect this is due to my non heat shielded intake sucking hot air.) My IAT temps from the relocated sensor read anywhere from 89 to 110 depending on outside temp)
The following was done to obtain these settings:
2K to 4K Fuel +6
4K to 7K Fuel +6
Fuel Injector slope at -6
2K to 4K timing is +2%
4K to 7K timing is +1%
I've tried going up to +3 or +4 on timing in both ranges, and I get 2 or 3 on KR...(I suspect due to unshielded hot air intake)
I know I must be going in the right direction with all this, as my fuel mileage in town has gone from 14.5 to 17.2 and my highway mileage has gone from 22.4 tp 25.1 with an A4. But I still feel like from my SOTP dyno, there is room for more improvement. (and I think my upcoming CAI will help) But I'd really appreciate any feedback on this from all the Predator guru's on here to see
how this compares with those who have had or done dyno pulls with their Predator tunes.
I do not and probably never will race this GTO. It is my daily driver. I simply want it to run at it's maximum efficiency for power and economy.
TIA for any help