Fuel cut with translator! Help!

[bottledbird68]

Help, I had no issues with fuel cut before the translator was in. I installed the MAF translator and now when I get on it from a roll I hit fuel cut around 4500 rpm or so. Not every time though, it does it consistently when the car is cold and occasionally after it warms up. I turned fuel cut off on the dip switches but it still happens? If I run the car hard from a dead stop though it doesn't do it?!? I checked for boost leaks and all is well there now, I changed the throttle body, that was my only leak, but I'm still having issues. Any other ideas? I have been taking all sorts of logs trying to sort this out so if there are any questions I can give an answer, I'm just not sure what you need to know? Please help, the propane kit is in and I want to crank the boost up to make a run for the 12's but I don't want to blow myself up

 

[Maarek]

Ok, I am still new at this, i havnt received mine as i just ordered it, But i feel like i have read every post on the subject. First reread the Fuel Cut switch documentation, Cause Its kind of confusing but i think on it off and off is on or something like that. Just look it over and try to decifer it maybe you have it on? With that out of the way, Which Tubo, Injectors, Pump, FPR ect.. Are you using?? I have been reading and 450s are easy to max out especially on a 16g with stock injectors you hit max at around 4500, maybe 5500-6000 rpm on a 14b though I only have this infro from what I have read. I was hoping for just a nice easy install but it seems injectors are going to need upgrading for me since I am running stockers.

 

[bottledbird68]

I read and reread the way the fuel cut switch works. Right now it is off, but it happens either way.
here are my mods:
removed air can and maf silencers, 2g exhaust manifold, clutchmasters hdsb clutch, removed cat, K+N filter, ported exhaust and turbo, starion fmic, custom ic piping, removed balance shafts, 2g throttlebody elbow, hardwired 3KGT fuelpump, removed all emissions and egr, custom 2 1/2" exhaust turbo back, Joe-P mbc @ 15psi, autometer boost guage, HK$ turbo timer,extreme motorsports stiff shift kit, magnecore plug wires, NGK plugs, 3" GM maf, maf translator
stock 14b turbo and stock 450cc injectors.
I was assured my injectors were fine by a knowledgeable source so I don't think they are the problem. I just don't know where else to look?

 

[kpt4321]

Do you have a pressure tester? Pressure test the intake.

I would not suggest using the no fuel cut feature, that's a good way to lose a motor if you don't have some other way to compensate for it.

Are all the knobs zeroed out?

....Kyle T.
93 TSi AWD "TURBO4"
14b - 12.8 @ 108

 

[bottledbird68]

Intake has been pressure tested. The only boost leak was at the throttle body shaft. I had a spare throttle body so I threw that on and now no more leak. I've been carefully logging and as far as I can tell I'm not hurting the motor. Most logs I have zero knock all the way through. Once in a while I get 1 or 2 counts on the high side of 6k rpm but that's about it. Any other ideas? I'm fresh out and I'm losing my mind Base knob, low, and mid are all zero'd out. High is two clicks towards rich. Does that help you?

 

[badboyr66]

I am having the same problem...everythin else seems to go ok, but when i launch it or hit like 15 16 psi. the car falls on it's face.
I wish i knew what the hell was goin on, cause the car was running better when i had my bad DSM MAF on


[email protected]

 

[bottledbird68]

Originally posted by badboyr66
I am having the same problem...everythin else seems to go ok, but when i launch it or hit like 15 16 psi. the car falls on it's face.
I wish i knew what the hell was goin on, cause the car was running better when i had my bad DSM MAF on


[email protected]

Well, at least I know I'm not the only one then. Sounds like the same problem. What are we missing, anyone? Any ideas?

 

[bottledbird68]

Originally posted by badboyr66
I am having the same problem...everythin else seems to go ok, but when i launch it or hit like 15 16 psi. the car falls on it's face.
I wish i knew what the hell was goin on, cause the car was running better when i had my bad DSM MAF on


[email protected]

Well, at least I know I'm not the only one then. Sounds like the same problem. What are we missing, anyone? Any ideas?

 

[HighPSI TSi Guy]

everyone is having this problem almost. my guess is a fault in calculations

 

[bottledbird68]

Has anyone been able to tune around it?? Or do we just need to deal with it Hey Ramchargers, any help here??

 

[bottledbird68]

Here's a question, I'm using a draw through setup. Is everybody else with this problem draw through as well? I'll switch to blow through in a heartbeat if it solves my issues. Or is this occuring in both setups?

 

[DrZiplok]

Here's a question - how do you know it's fuel cut?

You say you're logging - what does the injector duty cycle look like when you hit this?

 

[bottledbird68]

it drops to 0% and then jumps right back up

 

[Benji]

Originally posted by bottledbird68
it drops to 0% and then jumps right back up

Well, that's fuel CUT for you. What the Duty Cycle right before it drops to 0%? Is it 99%? Or even 100%? Then obviously that should tell you that you are running out of injectors.

Remember, that GM MAF + translator flows much more air - more air = more fuel.

Simple, right?

If you duty cycle shows less than 95% though before cutting, you problem lies elsewhere!

 

[Turbo Lag]

Originally posted by Benji


Well, that's fuel CUT for you. What the Duty Cycle right before it drops to 0%? Is it 99%? Or even 100%? Then obviously that should tell you that you are running out of injectors.

Remember, that GM MAF + translator flows much more air - more air = more fuel.

Simple, right?

If you duty cycle shows less than 95% though before cutting, you problem lies elsewhere!

Benji is right. You cannot run as much boost with the stock injectors after installing the translator. If I run 15psi I will hit fuel cut also with my stock injectors. It just flows too much air. I used to run 17psi prior to installing it and my car feels faster now at 14psi than it did at 17psi with the 3" sensor installed.

 

[badboyr66]

maybe it is right....but if so...lets at least follow up on it. In the mean time i will get a new pump and injectors ect.

[email protected]

 

[badboyr66]

hmm sure am glad i got the 3" and not the 3.5

 

[bottledbird68]

Hmm, I understand what you guys are saying and I see the logic in it. But, I was discussing this with GRNDSM on a local forum and he told me he was routinely running 112 to 114% duty cycle on 450cc injectors with no problems whatsoever. Now I'm confused, it's kinda hard to argue with his results Hey badboyr66, let me know how you make out. In the meantime, if I get an adjustable regulator and turn the pressure up think it will be enough to lower my duty cycle? I'm actually running around 112% in the higher rpm's. I'm looking for general consensus here as I was told otherwise by a knowledgeable source

 

[bottledbird68]

Here's a little more food for thought, it cuts worse when the car is cold. After it warms up some it rarely does it I don't mean outside temp either, I mean engine temp. How could that be injector related? I'm still confused on this one?

 

[badboyr66]

Mine does it when the car is warm...and the warmer it gets the worse it does it

 

[Tallen]

umm, did ya try ruchening the car out?? maybe tell it you have one step smaller i jectors.

 

[kpt4321]

You mean leaning it out, not richening.

Do you guys have knock? If not, then lean it out! The MAFT acts like an UNAHCKED MAF, and as such, you will be much more likely to fuel cut.

....Kyle T.

 

[bottledbird68]

Nope, no knock. Hmmm.... Thanks for the input. As soon as I get another tranny in the car later this week (don't ask ) I'll give that a shot. I'll let you know how I make out