Okay, I'm getting really frustrated now & I usually turn to the forums as a last resort after researching and dabbling on my own.
I would post on e30tech, but I'm banned for whatever reason.
What you need to know:
M20
3.5" Miller Maf
173, No WAR chip.
Draw-thru setup. (MAF before Turbo)
42lbs Injectors
Walbro 255
LC-1 Wideband
TiAL mvr
Grimspeed MBC
Brand new spark plugs, 1 step colder gapped to .025 I believe
Tuned by Dan Miller himself on the Dyno.
12psi
12.5 AFR
91 octane
I don't have logging.
Alright so I've been having problems on and off with WOT AFR's.
When I have the throttle pinned and reach full boost, 12psi, my AFR's sometimes hit high 13's and even 14's which I immediately let off. I can hear the engine "suffering", to which I think is pinging. When everything is running dandy, I'm around 12.5 AFRs. These ratios happen sometimes, and sometimes they don't.
Although, from 0 - 10psi(part throttle or almost full throttle, but not letting it hit full boost by modulating the pedal), my AFR's are a healthy 11 - 12 and it pulls retardedly well. The problem comes only when I'm WOT, pedal pinned, and in full boost.
What I've done:
-Taped a fuel gauge to my windshield and went for a drive on the freeway. There is no erratic movement @ idle, part, full throttle. I can't remember what it was WOT, but I think 44psi. Idle was steady as well; no concern for a failing pump.
-Cleaned the MAF and element plenty of times.
-Pressure tested my BOV. It checks out.
-Wastegate is brand new, TiAL vband mvr.
-Tighten and re-tighten all hoses and clamps.
What I think:
-Does this sound like a shitty TPS? I know m20 TPS's are switched, unlike M50 ones.
So it's either idle, or WOT. It does click when I push the butterfly, but maybe it's oil soaked or faulty. IDK. Next step is to clean it I suppose since I don't have a replacement and testing it confuses me with the online tutorials. I'll update when I do that.
-I do have a wee bit of oil coming from the outlet on the turbo when I remove the MAF/Intake which leads me to believe that it's messing up the MAF readings. Though I don't know if it's the turbo, or the crank case hose/catch can exit line. But, why are my part throttles up to 10 psi so good? Physics tells me that any leaking oil while in motion should be just sucked thru the turbo and into my exhaust or intake? Could the oil be messing with the sensor on the wideband?
-ECU Coolant temperature sensor. This is usually for idle, but does the ECU rely on it while the throttle is open? I'll replace it anyways and update. My idle isn't the greatest half the time on start up, but it corrects itself in around 30 seconds without me touching the throttle. Starts @ 18 AFR and adjusts to 14.7 on it's own after a while.
-FPR. IDK. Fuel pressure was pinned WOT and idle.
The car was JUST re-tuned by Dan, and it ran amazing. Very smooth graph till 6.5rpm
The next day and few days after, I started getting these problems which lead me to believe the tune just was a band-aid for whatever is going on, so I'm ruling out tuning.
Any help is appreciated. I'll update as I go.
I would post on e30tech, but I'm banned for whatever reason.
What you need to know:
M20
3.5" Miller Maf
173, No WAR chip.
Draw-thru setup. (MAF before Turbo)
42lbs Injectors
Walbro 255
LC-1 Wideband
TiAL mvr
Grimspeed MBC
Brand new spark plugs, 1 step colder gapped to .025 I believe
Tuned by Dan Miller himself on the Dyno.
12psi
12.5 AFR
91 octane
I don't have logging.
Alright so I've been having problems on and off with WOT AFR's.
When I have the throttle pinned and reach full boost, 12psi, my AFR's sometimes hit high 13's and even 14's which I immediately let off. I can hear the engine "suffering", to which I think is pinging. When everything is running dandy, I'm around 12.5 AFRs. These ratios happen sometimes, and sometimes they don't.
Although, from 0 - 10psi(part throttle or almost full throttle, but not letting it hit full boost by modulating the pedal), my AFR's are a healthy 11 - 12 and it pulls retardedly well. The problem comes only when I'm WOT, pedal pinned, and in full boost.
What I've done:
-Taped a fuel gauge to my windshield and went for a drive on the freeway. There is no erratic movement @ idle, part, full throttle. I can't remember what it was WOT, but I think 44psi. Idle was steady as well; no concern for a failing pump.
-Cleaned the MAF and element plenty of times.
-Pressure tested my BOV. It checks out.
-Wastegate is brand new, TiAL vband mvr.
-Tighten and re-tighten all hoses and clamps.
What I think:
-Does this sound like a shitty TPS? I know m20 TPS's are switched, unlike M50 ones.
So it's either idle, or WOT. It does click when I push the butterfly, but maybe it's oil soaked or faulty. IDK. Next step is to clean it I suppose since I don't have a replacement and testing it confuses me with the online tutorials. I'll update when I do that.
-I do have a wee bit of oil coming from the outlet on the turbo when I remove the MAF/Intake which leads me to believe that it's messing up the MAF readings. Though I don't know if it's the turbo, or the crank case hose/catch can exit line. But, why are my part throttles up to 10 psi so good? Physics tells me that any leaking oil while in motion should be just sucked thru the turbo and into my exhaust or intake? Could the oil be messing with the sensor on the wideband?
-ECU Coolant temperature sensor. This is usually for idle, but does the ECU rely on it while the throttle is open? I'll replace it anyways and update. My idle isn't the greatest half the time on start up, but it corrects itself in around 30 seconds without me touching the throttle. Starts @ 18 AFR and adjusts to 14.7 on it's own after a while.
-FPR. IDK. Fuel pressure was pinned WOT and idle.
The car was JUST re-tuned by Dan, and it ran amazing. Very smooth graph till 6.5rpm
The next day and few days after, I started getting these problems which lead me to believe the tune just was a band-aid for whatever is going on, so I'm ruling out tuning.
Any help is appreciated. I'll update as I go.
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