Need someone to shed some LIGHT!!!

[VTECCURED]

98 1.8t , stock motor...
gt30 with all support bolt on parts.

Here is the problem...
i have been noticing that i will lean out under WOT...4 gear pull.
up to 5k at WOT i see low to mid 12... as the RPM still climb.. AFR will raise to 13 sometimes see 13.5.

My question is , is this normal.. ?

just to answer everyones question... i do have a walbro fuel pump, brand new at that time! TAPP software with 630cc. Ford Lightening (ebay) MAF.
i also running an adjustable FPR.. right now im sitting at 56psi which is above 3 bar as recommended.

I just cant see how i can do to solve this issue, if it is an issue?

OH one more thing... i recently installed v6 Throttle body and yes its adapted.

Thanks guys,
JOHN

i have a feeling if i continue with it as it is.. im going to blow that motor .

[b5a4gt28]

My car has the exact same problem. I don't have a similar setup but I do have a 28rs with 440's. I bought a good maf, adj fpr, checked all leaks, and still have no answer. Oh and I even went to a colder plug. Good luck.

[maxspeed]

its called idonthaveamapitis, and it can be a serious hinderance to engine performance.

[1fstavant]

dude same problem here....leans out to about 13 at wot....i have the same tune and setup (on a 50 trim tho) have a feeling its a vacuum leak since ive personally changed my injectors, fuel pump, added an inline, changed my maf, and installed a 4 bar....with the 4 bar it runs at 11.8 wot but thats cuz its dumping more fuel, which is compensating for the extra air....

[VTECCURED]

dude same problem here....leans out to about 13 at wot....i have the same tune and setup (on a 50 trim tho) have a feeling its a vacuum leak since ive personally changed my injectors, fuel pump, added an inline, changed my maf, and installed a 4 bar....with the 4 bar it runs at 11.8 wot but thats cuz its dumping more fuel, which is compensating for the extra air....

so you saying that after u install the 4 bar.... u are now at 11afr....
or is it raising to 13 ...
I have an adjustable fpr and im sitting at 56 psi which is close to 4 bar and it satrts to run lean after 5k... it should stay at 12 through out right?

john

[t1demont1]

high 11s is where you want to be. Did you reset you ecu like i told you to try? since the tune was adapted to the 2.5" tb, the extra air from the 3" would lean it out.

[VTECCURED]

high 11s is where you want to be. Did you reset you ecu like i told you to try? since the tune was adapted to the 2.5" tb, the extra air from the 3" would lean it out.

not yet .... but will tomorrow... and I will log it also.

[killa]

not yet .... but will tomorrow... and I will log it also.

John, turn that fuel pressure down, the tune is for 3bar of fuel pressure, after reset the ecu and TB.
While you're at it, roll by and trade you Throttles, no need to pay extra for the code

[1fstavant]

yea after the 4 bar im at 11.8 so i assume i have un meterd air coming in and the extra 10% of fuel is compensating for that...

[t1demont1]

yea after the 4 bar im at 11.8 so i assume i have un meterd air coming in and the extra 10% of fuel is compensating for that...

with a boost leak you will actually run richer since your maf is pulling in tons of air and not as much of it is making it to the cylinders. A leak will also make you run leaner out of boost. Johns case is different because there is more air making it into the inake manifold faster than what the ecu adapted the tune for from the .5" larger tb.

edit: I would check for leaks after the maf before the turbo on the intake, or maybe try some fuel system cleaner. The 10% ethnol in the fuel gunks up lines. My friend with a busa kept having to turn his idle up for the bike to idle at the right rpm, then he used some fuel system cleaner, forget the name, but 2hours later his bike was idling at like 1800rpms so he dropped it back down to where it needs to be and the next day it went back up to 1500 so he had to drop it again. This is on a bike thats only a year old too.

[1fstavant]

depends on the leak...since with a vacuum leak your pulling air into the motor that the maf didnt read so the air fuel would be right with the readings from the maf but since there is extra air its leaning it out- so i think with the higher fpr its compensating for the air....that and i think my wideband is going on me

[VTECCURED]

if its a leak... i would noticed it at idle? dont you think.

It doesnt matter what Fuel Pressure im at... but around 5k .. it will start to run lean.
im wondering if its program conflicting with the TB...
But then again... the MAF should compensate for the additional air being let it via the bigger Throttle body..

tomorrow... i will drop down the Fuel pressure down to 3 bar, and will be reset the ECU...
and readapt the TB.

will then monitor the AFR...


Stand alone ,. here i come ... lol

john

[VTECCURED]

dropped the fuel pressure to 3 bar even...
reset the ECU, and also did a TB adaption afterwards...
drove for about 10 miles ... and under a WOT in 4th gear..


my AFR it dips to 12, but then creeps up to 13.5 and stays!

this is not good!... i have to do some logging and see if i can find out whats going on.

Anyone has this happen?
could it be software related?


JOHN

[1fstavant]

how is part throttle...are you lean under that condition or no

[1fstavant]

mine does the same thing except with a 4bar fpr it goes down to around 11.0 and holds 11.8-3 bar 12.0 and creeps to 12.8 or 13.0- and like i said i have changed everything, maf, injectors, fuel pump, installed an inline fuel pump, and changed my lines out-and i checked all grounds

[killa]

dropped the fuel pressure to 3 bar even...
reset the ECU, and also did a TB adaption afterwards...
drove for about 10 miles ... and under a WOT in 4th gear..


my AFR it dips to 12, but then creeps up to 13.5 and stays!

this is not good!... i have to do some logging and see if i can find out whats going on.

Anyone has this happen?
could it be software related?


JOHN

How is the AFR under load with 3 bar of fuel pressure vs 4 bar?
If the same then it's the tune.

[VTECCURED]

how is part throttle...are you lean under that condition or no

ok... part throttle at 3bar the feels a bit sluggish. until the boost kicks in and the afr enriches...there is a delay.

on 3.75 bar (about 57 psi) the car feels so crisp , and the afr enriches alot faster(almost instantly as the pedal gets depressed). if i full throttle it will hit low 12 to mid 12 until 5k and starts to lean out. which it will hit 13.5,and holds.

so part throttle in either instance, it hold 12.. to mid 12!


john

[VTECCURED]

mine does the same thing except with a 4bar fpr it goes down to around 11.0 and holds 11.8-3 bar 12.0 and creeps to 12.8 or 13.0- and like i said i have changed everything, maf, injectors, fuel pump, installed an inline fuel pump, and changed my lines out-and i checked all grounds

thats exactly what i wanna see and not worry about it....

i understand that when the turbo loses breathe later in the RPMS that it should lean out... but damn at 5k is way to early... dont u think.

[VTECCURED]

How is the AFR under load with 3 bar of fuel pressure vs 4 bar?
If the same then it's the tune.

afr is exactly the same in both and react the same way... the only difference is how fast it enriches when the pedal gets depressed.

either the tune or it has to be the maf.... but i dont remember this happening before the throttle change.
lol who knows...
finally get my idle perfect and now the afr is off... there is something always to work on. lol i love this car.

john

[Toyotatech]

I read somewhere that it is supposed to be a factory ford maf, that the ebay ones will cause lean conditions with this tune, but I can't find where I read it now.

[t1demont1]

yeah but they both had cars with good AFRs before.

[VTECCURED]

Problem SOLVED>>>

as i am messing with the FPR , raising pressure , dropping pressure...
i noticed that either way, low or high, it would start to run lean on top end!

SO when i went in to adjust the FPR for the final time... i noticed the nipple that accepts the vac line.. was turning. WTF!!!

realized then that nipple is threaded on (ECS FPR)...
what i think happen was, since the nipple was loose... under boost it actually wasnt getting the correct signal causing it to not dump enough fuel.

Few days later,
today , WOT.... my AFR now reads mid 12 all the way to redline>>> lol NICE!
by the way.. im running 50PSI ( about 3.33bar)


THANKS GUYS>>>

happy holidays!