AFR Tuning

Rageful · 07-05-2011, 10:32 PM

20g turbo(20psi), 255 walbro, 560cc evo injectors. Rest of Mods on profile.

I do know I am in need of a afpr, and its on the list just before the professional tune this summer.

Car has a 98ecu with tactrix cable already setup, so tuning software of choice is:
ECUFlash/CeddyMods with EvoScan for logging software.

Idle is 14.7:1 So I am alright at this aspect.
During DD car is 11.9-15.1 So This isn't bad imho.

During WOT car goes into 10:1 (Gauge Does Not Go Below 10, so it is a possibility it is lower)

Is there anything I could do at this time besides the afpr? (relatively new to tuning)

In Certain Areas My A/F tables go down to as low as 9.1. Should I start by just adjusting my A/F Tables slowly? Or Am I hopeless until I get the afpr.

Another Question:
20g/255walbro/560cc. Is this A/F setup fine with that size injectors and my other mods? Looking for 350-425whp.

snowborder714 · 07-05-2011, 10:40 PM

You should have a wideband o2 sensor before really tuning AFR's.

Any idea what your IDC %'s are? I can't imagine being able to even push the 20g on 560's without easily overrunning them.

Rageful · 07-05-2011, 11:40 PM

I do have a wideband. AEM Wideband O2 Air/Fuel UEGO Gauge Kit - Part Number: 30-4100 - Sparktec Motorsports

I'll check the IDCs today when I log it. But I figured as much about the 560s duty cycle.

What would you recommend? 650/700s?

What ECU Changes would I need to do to accommodate for larger injectors, other then going into EcuFlash and setting the new cc size. As in, to keep me stable until the tune day.

mattasi · 07-06-2011, 01:06 PM

For pump gas I would recommend 880cc. I have a 20g at 24psi with 660cc injectors and they are pretty maxed out..

e_miller81 · 07-06-2011, 01:36 PM

You only want to run about the 80% Injector duty cycle. I would use this calculator to help determaine the injector size

RC Fuel Injection

I forgot to mention that if you plan on running E85 you can actually get more more because it can take more igntion but it also takes about 20% more fuel to do so.

Rageful · 07-08-2011, 01:47 AM

Ran 3 sets of 3rd gear pulls.

note: Throttle Cable is a bit loose, have planned to tighten it this weekend when me and my friends hang out.

Mechanic Installed Fuel Rail ONTOP of Throttle Cable on my last visit ~_~.

Highest IDC was 70.2% at 85% TPS.

Car log when as low as 9.8 AFR, don't have load (im at work

)

Car ran like a beast tho. (1st actual run since head work)