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Thread: Leaning Out WTF!! Need Some Advice

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Posts: 1-10 of 17
2010-06-26 18:49:52
#1
Leaning Out WTF!! Need Some Advice
Ok so a month ago or so. I had my ecu retuned from JWT. Went from 50lb injectors to 72lb'ers and from 9:5/1 comp ratio to 8:5/1. I installed a new FPR (china made) and new braided lines and AN fittings. I didn't change anything else. Before the car would pull a consistant 11.4-11.6 AFR at WOT. Now i hit it and it falls to 11.4 ish and then it starts to climb to 12.5-12.8 when it gets in the upper rpm's. So found that the FPR I installed wasn't making the right fuel pressure. CHINA JUNK. At 15psi it was only making 3.75 bar. I can set it to 3 bar with the vac line off. But it should make roughly 4 bar @ 15psi. So I went to Summit Racing last night and bought an Aeromotive FPR. Installed it and now it makes 4 bar fuel pressure @ 15psi. The AF's are better now but still climbing into the low 12's. 12.5 was about the highest. So I bought a new Walbro when I picked up the FPR. So I put that in this morning. I haven't drove it on the highway yet to see, but the small ride I took it still seemed to be climbing into the 12's. I have boost leak checked with intake pipe on and no leaks. I put a new fuel filter in even though it didn't need it. I did all this before the new FPR and pump. So I am running out of ideas. Please help. Any info is appreciated. Thanks guys
2010-06-26 19:46:05
#2
Intresting
I also have a buddy thats having the same issue. Went with bigger injectors and z32 maf after installing a t25/t28 turbo and sent in his jwt ecu for a reflash. Got the ecu back from jwt and is not at 12.5 afr at wot. Before it was in the mid 11's.
2010-06-26 20:02:18
#3
hmmm.. interesting. The only thing I can think of is that I used a 72lb Siemens Deka injector instead of MSD injectors. But when I talked to a guy a JWT yesterday he said it should be fine. So I'm just uber pissed at this point. Had a track day tomorrow that it looks like I'm not gonna make
2010-06-26 20:06:35
#4
well my buddy used msd 50lbs and is still having that same issue.
2010-06-26 20:13:10
#5
Think its the tune???
2010-06-26 21:52:42
#6
probally not, jwt ecus are always rich.

stratton.
2010-06-27 12:46:38
#7
Originally Posted by STRATTON
probally not, jwt ecus are always rich.
stratton.


JWT ALWAYS rich?
Then maybe I should swap out my JWT ECU for a stock ECU -
in my 162whp daily driver B13 SE-R, that gets nearly 40mpg,
mostly city miles.
2010-06-27 13:09:04
#8
Originally Posted by SRpowrd
I installed a new FPR (china made) and new braided lines and AN fittings. I didn't change anything else. Before the car would pull a consistant 11.4-11.6 AFR at WOT.


You answered your own question buddy. I'm sure that piece of crap Chinese regulator isn't keeping your fuel pressure in the right ratio as your boost increases. If you FPR is messed up then that can cause all kinds of inconsistent AFR's THROW AWAY that pos CHINA regulator which I would never ever trust for my fuel in the first place good you got a new radiator. If the new regulator still is doing this it may be the larger lines affecting it. I can't think of anything else besides buying a Calum RT so you can actually tune...did you ever consider the JWT ecu might not be a perfect tune considering your car wasn't on a dyno and they don't know exactly how it runs. I tune my car for an hour on the dyno changing all kinds of things to get it perfect. Im sure JWT is really good at guessing all these things but I'm sure they cant be perfect.
2010-06-27 13:10:12
#9
Originally Posted by jp314
JWT ALWAYS rich?
Then maybe I should swap out my JWT ECU for a stock ECU -
in my 162whp daily driver B13 SE-R, that gets nearly 40mpg,
mostly city miles.


Mine gets 42 on the stock ECU don't feel special...usually 36 to 38 cause I drive harder in the city. JWT is usually rich because they don't want people calling them and saying oooooo my motor blew up because your tune leaned out buy me a new motor.
2010-06-27 13:30:46
#10
Brian,

I will call you later on today.
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