1jz cutting out at wot

[300zxpwns]

well i fixed alot of the problem today. still not sure on exactly the cause.

rewired my safc and made sure all connections were good. the wastegate to turbo vacuum hose on one of the turbos i realized was smaller than the one i had on it before, so i changed that to a bigger hose. after i did that it still cut out some but not near as bad. I change the settings on safc on high throttle to -2 % and it only cut out one time at 5500 and then i added 4% and no problems. Still not sure of the cause.

 

[suprahero]

Sounds like you need a tune in a bad way. Have you ever had it tuned by a professional at a dyno?

 

[300zxpwns]

no i haven't yet. Well while driving to work this morning did a couple pulls and problem is still there, its just not as bad. but still cuts out.

 

[suprahero]

Can you make a video of it while it's cuttting out?

 

[300zxpwns]

i will try to do that today.

 

[300zxpwns]

ok here is the first vid with safc on all stock settings.
View My Video

I did a pull w/ -5% fuel taken out. It did not cut out once.


anything over -5% taken out it cuts out bad. I tried +5% and it was even worse. I used to be able to run +10% all the time with no problems.

 

[te72]

Sounds kinda like what my car's doing now that I've put on a 3" ypipe... get above 4k rpm, turbos spool to 13psi, and it likes to 'pop'. Feels like 7m fuel cut, but nowhere near as intrusive. You guys sure it isn't fuel cut?

 

[300zxpwns]

it definately could be now that i can't even run at stock fuel without it cutting out. Have to run it at -5 percent for it not to cut out. I have a walbro in my wrx that i might take out today and put it and see what it does.

 

[suprahero]

Do you not see that it was running lean? Your wideband showed a best of about 12.6 I think. For me that's way too lean. If you keep running it like this I see a big kaboom in your near future. Can't you go to the rpm it starts running lean in and add fuel to that rpm and then go to the next and add fuel there? You don't have to do an across the board change like you keep saying you're doing. You really need to get this to a tuner before you're forced to hitch a ride with your friends. Did you ever get Ben to look at it?

 

[suprahero]

I watched the video again and it seems it's not as lean as I first thought.


Maybe after tomorrows tuning session with my wife's I can shed more light on the subject. It's been about three years since I've messed with the AFCII. Maybe I can learn something tomorrow that might help you out.

 

[300zxpwns]

yes i do see that its lean but any fuel that i add seems to make it cut out.

 

[T701jz]

Do you still have ur canister hook up or cap?

 

[sc4me]

Hi guys, i just saw the vid, and that sounds alot like what my car is doing.On some runs my afrs are like yours wandering around 12.3-12.6, but i have had other runs with the same settings that they hit 11.9-11.8 . the only thing ive noticed as weird is that when looking at the datalog feature on the emu my injector input/output actually gets values of 0 somepoints above 5krpm. if anyone else has had this problem with the datalog, can you please let us know what you did to resolve it. thanks, and gl to you also 300

 

[300zxpwns]

Do you still have ur canister hook up or cap?

no its not hooked up.

 

[300zxpwns]

i think i had bad gas or something, filled up today and drove around for a bit and the problem got better and better and slowly went away..

wot with -5% taken out afr's are low 11's to high 10s

 

[Bigzavs]

what stations around here do you go to?

theres certain companies in the arlington/grand prarie area that are to be avoided. my car would run like dog shit on gas from them

 

[300zxpwns]

which should i avoid? i remember i had to get gas at a out of town station recently so that was probably it.

 

[Bigzavs]

i get gas at only Shell, Exxon/Mobil, or Chevron

theyre usually a little more expensive but worth it on a Supra

now i buy at kroger, since its the only local E85 station

 

[T701jz]

I use premium unleaded only. I'm sure the canister will play a factor for the pump to work well. I remove the canister but I'm using a pressure relief valve to make sure I don't KABOOM the tank. Pay close attention when your tank is full and when it's low. You'll feel the difference.

 

[te72]

now i buy at kroger, since its the only local E85 station

You know, Nebraska's only ONE freaking state over, and there isn't anywhere I can get E85 even if I wanted to anywhere NEAR here. On the plus side I suppose, I can get a decent selection of race fuels from a local petroleum company...