EvoScan Data Log - Need Help

[simace]

I've been having low rpm hesitation and timing pull at WOT at higher rpms. Until the advent of EvoScan, I wasn't able to tell if knock was happening or not.

Anyhow, I need help reading the data.....attached is the EvoScan datalog. 3rd gear pull and a bit into 4th.

[simace]

Still looking for help or interpretations on data log....

[markoverclock]

your probally running out of fuel your idc is going into the 100 ideal is at 85% up your fuel rail pressure if you can and do another log. if you dont have an adjustable fuel pressure regulator you might want one or just put in a walhbro pump. what are your mods that might help us help you.

i just ordered mine last night cant wait for it to get here to play with it.

[jba3]

Agreed, it looks like you're running out of fuel.

Beyond that, your fuel trims are off. They should be close to 100, give or take up to 10%. You're into the 120s on long, mid and short term. Adjust your A/F and then give it another shot. The knock is way too high.

[simace]

How do you adjust fuel trims? I just installed a SAFC-II....

[jba3]

Originally Posted by simace

How do you adjust fuel trims? I just installed a SAFC-II....

Unfortunately, I only know how to adjust it on an evo. My friend who does all his own evo tuning (made 502/501 with a HFC on a BW S256ET, dynojet) tries to teach me about reading logs, and I've only picked up a little but I do know he said fuel trims should be close to 100. You add or pull fuel as necessary to increase/reduce fuel trims, but I don't recall whether adding fuel will increase or decrease fuel trims.

SAFC definitely sounds like the way to do it, so hopefully someone can chime in who knows how to.

EDIT: The evo ECU is rewritable via ECUFlash so all the fuel changes are done directly to the ECU without a piggyback, hence why I don't know how to do it via SAFC.

[Let-luse]

OK. First, I am not sure that the Fuel Trims are acurately displayed on these logs because the 98-99 only have two fuel trims (Long Term and Short Term) and they fluctuate quite a bit especially the ST one (I can see it on the Scanmaster 3).

Anyways, from your logs it seems that you are having knock issues but I don't see a lot of timing pull. IDCs are a bit high but I think that no one will be able to help you unless you provide some additional info like the setup you are running (turbos, injector size, adjustable or stock FPR, fuel pressure, WB O2 values at WOT....)

Reda/

[simace]

Here's my setup....

Completely stock '99 with the following mods;
-K&N Intake
-HKS Recirculating BOV
-2.5" Custom DP (No Precats)
-3" Custom Exhaust
-Greddy FMIC (from GT Pro Group Buy)
-Walbro 255lph FP (Not hotwired or bypassed)
-AEM TruBoost (Spring@3.5lbs, A@60%=12psi, B@65%=14.5psi)
-AEM UEGO Wideband
-Tein S-Tec Lowering Springs
-Prosport Fuel Pressure Guage (Electric)
-Apex'i S-AFC II
::Low is unmodified throughout the RPM range
::High is only modified starting at 4.5k-7k RPM with max -6% correction @ 6k RPM because UEGO was reporting 10.5 or lower A/F ratio at WOT Hi-RPM condition.

The log in question; I did not have the Apex'i S-AFC II installed at that time, so the log was whatever the ECU doing with respects to fuel.

[Let-luse]

Originally Posted by simace

Here's my setup....

-Walbro 255lph FP (Not hotwired or bypassed)
-AEM TruBoost (Spring@3.5lbs, A@60%=12psi, B@65%=14.5psi)
-Prosport Fuel Pressure Guage (Electric)

The log in question; I did not have the Apex'i S-AFC II installed at that time, so the log was whatever the ECU doing with respects to fuel.

What is your fuel pressure at idle with the vacuum line unplugged?

You should check the voltage at the pump to see if it's getting enough juice. Typically bigger fuel pumps will be even more sensitive to voltage (I know that Supra fuel pumps are).

What boost were you running on the logs?

Reda/

[simace]

Vacuum line unplugged? Hmm don't know about that. How do I go about it so that I can check it. The way it stands, at Idle I see about ~36psi. But I do have to admit that I don't trust the prosport guage because at times it reads ~15-20psi at Idle.

I'll check on the voltage at the pump.

Log was running about 13psi @ WOT.

Eddie