Power Cut On Cold Nights

[D3LTR33]

Hey, I've got a basically stock 92 r32 gts-t. Months and months ago i got a manual boost controller and turned the boost up to about 12-13psi and more recently i got a 3 inch exhaust with split dump and high flow cat.

It has always run great and loved to be thrashed. But last week on a f**king cold night, i gave it a hit (once the engine was fully warmed) and as the boost started to build, the engine choked. I lost all power and it felt like i was basically just rolling. I had to come off the accelerator to get the power back. This would happen late at nights and early in the morning when it is incredibly cold, but during the day it runs perfectly.

Me and my friend initially thought this was a matter of the stock fuel pump and injectors not being able to match the colder denser air now going into the engine. But the last few days i haven't been able to replicate the problem. It seems to be running fine even on the coldest nights.

What's going on? Why did i have this problem one week, but not the next?

[Rekin]

did the power cut happen above 4000rpm and was it a missfiring all the up the rev range?

I had similar problem and mechanic said it was crank angle sensor.

It could also be your coilpacks not handling the higher power from the dense air. Check coilpacks for hairline cracks.

[Strik3r]

sounds like boost cut to me. just means your hitting a point on your ECU map that it considers dangerous and cuts power to the engine. time for aftermarket management, or just take out ~1 PSI to avoid it. if there are other symptoms (like missfiiring through the rev range) could be the coilpacks.. but from what youve said, its just boost cut.

[D3LTR33]

It runs fine up to the point where it cuts. No misfire. And i think it cuts above 4000rpm.

Might have to look at new ecu.

[4core]

It sounds like you need a fuel computer.....

Edited June 3, 2007 by 4core

[Strik3r]

if you dont intend on modifying your car down the track, look at an SAFC to band-aid the problem.

otherwise, start thinking about tracking down a PFC and getting a proper tune done.

[1400r]

fuel cut wind down the boost so it doesnt cut under all condition i.e cold nights

12 + psi is alot without a cooler on a cold night it could easily spike to over 1 bar

[D3LTR33]

fuel cut wind down the boost so it doesnt cut under all condition i.e cold nights

12 + psi is alot without a cooler on a cold night it could easily spike to over 1 bar

So if down the track i get a cooler, the problem is gonna happen more often?

[Rekin]

Im surprised you are running 12psi with only catback and no fmic.

It's preferred that these 2 are modified before any boost is increased because you may be causing a lot of harm.

I suggest drop it back down to 10psi and get supporting mods before you start increasing boost

[limpus]

Factory fuel cut...anyone who says otherwise has NFI...as mentioned...some sort of aftermarket engine management will stop that...or even a fcd...

Edited June 3, 2007 by limpus

[D3LTR33]

Im surprised you are running 12psi with only catback and no fmic.

It's preferred that these 2 are modified before any boost is increased because you may be causing a lot of harm.

I suggest drop it back down to 10psi and get supporting mods before you start increasing boost

Hey, I've got a basically stock 92 r32 gts-t. Months and months ago i got a manual boost controller and turned the boost up to about 12-13psi and more recently i got a 3 inch exhaust with split dump and high flow cat.

I got turbo back exhaust.

Just trying to decide which path to take atm.

I really wanna get an fmic, but if i do that then i definately have to get an ecu. And after that i'm gonna want more and more power because i know i can have it. So it's gonna cost me alot in the long run.

Alternatively i could turn down the boost and save my money. But stock power is sooooo boring.

[limpus]

Getting an fmic does not warrant an ecu...although some sort of ecu will probably be best...if you keep your boost to 12psi...i don't see any problem...provided you are not running mixtures that are too lean...have you got a fuel pump yet? if not...i'd get one asap...even before considering a fmic...fuel pumps on 32s are VERY old now and will most likely be on their way out....

Edited June 4, 2007 by limpus

[tigr33]

fuel cut, had the same problem 1 month ago, got my safc tuned and all good

[700HP-GTR33]

Can the power drain on the battery cause this?

I have had this happen to me...twice so far.

On cold nights....my heater,power fc,AVCR ,air purifier..stereo/amp/sub...lights...are all on.....

Can the drain in the power and a bad battery be at fault.

The battery in the boot is tiny and due to workshop downtime has been drained at least 10 times....

The only thing I think that keeps it firing every morning is the turbo timer charging it the night before..lol

It sounds like it is electrical...if you know your battery is good...check your coils....spark plugs.

This can also be a AFM fault.

[32vspecII]

its air flow cut (fuel cut)

[Crans]

have you checked your AFM? mine did the same thing swaped out AFM and problem went away