Have boost then POW!!!

[Sicotic]

like i hit a wall, but if i let off gas and go agian its fine. My guess a Boost Leak. Any suggestions?

 

[Nick2gGST]

Someone had this issue the other day, it was boost creep. They were told to dremel out the o2 housing.

 

[matthewdesigns]

Welcome to fuel cut. You need to do a boost leak test for sure. Looks like you are stock, so a leak is probably the cause. While boost creep could contribute to overboosting and cause the OP to hit fuel cut, it's not the cause directly.

 

[->PrOjEcTGS<-]

Fuel Cut +1

Use the search feature to look up "Fuel Cut" there is tons of information on this site about it.

 

[Sicotic]

thanks getting stuff tomorrow ill update ya. also i my boost guage(Faze) has a plastic hose ahould i get a rubber hose instead? bc it saying im boosting past 25 psi

 

[ArticNemesis]

thanks getting stuff tomorrow ill update ya. also i my boost guage(Faze) has a plastic hose ahould i get a rubber hose instead? bc it saying im boosting past 25 psi

Well, 25psi would explain the fuel cut. You need to figure out WHY you are overboosting.

[edit]

And quit pushing the car into boost with that problem, or we will be reading in another post very soon about how you blew your headgasket or trashed your motor.

 

[Sicotic]

Well, 25psi would explain the fuel cut. You need to figure out WHY you are overboosting.

[edit]

And quit pushing the car into boost with that problem, or we will be reading in another post very soon about how you blew your headgasket or trashed your motor.

i dont trust that i can shift safely around 4000k but i ahve evrything stock, with a 14b turbo.

 

[dsmfa9nutter]

You will hit fuel cut at a constant (mbc set to) 17-18lbs with a 14b, 450s and a stock ecu. You can spike higher than 25lbs, at one point on a cold day I maxed my 30psi gauge with a spike when my hose came off my mbc.

 

[my dreamt dsm]

Yes fuel cut it is. The other guy that posted few days ago installed a downpipe. He also explain about hitting a wall. So fuel cut is the culprit.
What mod do you recently do to cause this? Or did it just happen?

 

[tsi1991awd]

I have this same problem. I was fine doing 15psi but after my Supra sidemount install, 15psi is WAY different and too much for the 450s to handle. I have 750s but waiting for ECMLink. Turn your boost down...especially if youre boosting 25psi on stock injectors and fuel pump! Thats what I did.

 

[ApexVIII]

You will hit fuel cut at a constant (mbc set to) 17-18lbs with a 14b, 450s and a stock ecu. You can spike higher than 25lbs, at one point on a cold day I maxed my 30psi gauge with a spike when my hose came off my mbc.

i max out my 30psi gauge too... but i can run that much boost

zip ties on every vaccume line!!!

 

[Fabian]

definitely fuel cut. The first time I had ever hit fuel cut I thought I blew a rod through the bottom end. Then I let back out the clutch and praaaaaaaaise hallelujah! the car was fine...

I have this same problem. I was fine doing 15psi but after my Supra sidemount install, 15psi is WAY different and too much for the 450s to handle. I have 750s but waiting for ECMLink. Turn your boost down...especially if youre boosting 25psi on stock injectors and fuel pump! Thats what I did.

I was running 16psi on my 450's in my gsx and never had a problem. wideband always read a nice 11.7! But of course I had a walbro 255 and ebay FMIC and some other supporting mods.

 

[Sicotic]

no mods except a 2g head thats all. It started to do after my new turbo. i never toched my boost i was happy to get the car running, my downpipe is broke in half where the flex stuff is, i put it back in but the exhaust is terrible. My exhaust manifold is cracked as well will this be a cause?

 

[habitatguy187]

i dont trust that i can shift safely around 4000k

Please stop doing that

 

[bnr32_coupe]

haha did that fuel cut give you a heart attack?
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[Sicotic]

haha did that fuel cut give you a heart attack?
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no just freaked me out, thought my car blew up i was about to be pissed. does a split flex pipe bad or can it cause this?

 

[habitatguy187]

no just freaked me out, thought my car blew up i was about to be pissed. does a split flex pipe bad or can it cause this?

You will blow it up if you keep on doing that, and no the flex pipe wouldn't matter.

It sounds like you've got some learning to do - VFAQ Site - Visual Frequently Answered Questions

 

[ArticNemesis]

You are hitting fuel cut because you are boosting way too much. You've gotta back down that boost on your stock fuel system, or you WILL break something.

^^habitat in a minute before.

 

[tsi1991awd]

definitely fuel cut. The first time I had ever hit fuel cut I thought I blew a rod through the bottom end. Then I let back out the clutch and praaaaaaaaise hallelujah! the car was fine...



I was running 16psi on my 450's in my gsx and never had a problem. wideband always read a nice 11.7! But of course I had a walbro 255 and ebay FMIC and some other supporting mods.

I was at 15/16 on stock fuel system with a rewire. If I had my 255 and AFPR then I am sure it wouldnt have been a problem. It was probably the pump not being able to push out enough fuel.

 

[Sicotic]

im stock how would i be pusing more boost? its stock nothing modified. Its a 14b thought it was like 12 psi max. not like 25. even tho my gauge says im pusing that high.

 

[ArticNemesis]

If your gauge says you are pushing that high, then you are. (especially if it's sitting at 0 off).

You need to fix whatever the problem is. Whether it's a bad wastegate actuator (or one not hooked up)

 

[JusMX141]

no mods except a 2g head thats all.

I never knew a head with smaller ports was an upgrade. Performance secret?

does a split flex pipe bad or can it cause this?

If by "split" you mean "completely separated from the rest of the exhaust" then yes. Your downpipe would, in effect, be about 3ft long at best....there's absolutely NO backpressure in the turbine housing. I'm sure your wastegate is opening at 10psi, but the exhaust just continues to flow through the unrestricted turbine housing, spooling the turbo more and more. Welcome to the wonderful world of boost creep.

 

[Sicotic]

I never knew a head with smaller ports was an upgrade. Performance secret?




If by "split" you mean "completely separated from the rest of the exhaust" then yes. Your downpipe would, in effect, be about 3ft long at best....there's absolutely NO backpressure in the turbine housing. I'm sure your wastegate is opening at 10psi, but the exhaust just continues to flow through the unrestricted turbine housing, spooling the turbo more and more. Welcome to the wonderful world of boost creep.

I did it bc it was a free head and i old one blew. I ported the intake mani to match the throttle body it i have more power than before/. but anyways the Exhaust thing could be the problem?

 

[tsi1991awd]

I never knew a head with smaller ports was an upgrade. Performance secret?




If by "split" you mean "completely separated from the rest of the exhaust" then yes. Your downpipe would, in effect, be about 3ft long at best....there's absolutely NO backpressure in the turbine housing. I'm sure your wastegate is opening at 10psi, but the exhaust just continues to flow through the unrestricted turbine housing, spooling the turbo more and more. Welcome to the wonderful world of boost creep.

I am running 3 inch open dp with no other piping whatsoever. I dont have any problems. Then again I have a ported turbo and O2 dump. Maybe that has an effect

 

[Colt4G63 also]

I have an idea! Post a picture of your wastegate, and the hose that connects to it. It's that vacuum canister thingy on the front of your turbo. Make sure we can see the whole rod that sticks out of it, and where it connects to the O2 housing.