R32 Gtr Loss Of Boost

[Sico04]

My R32 gtr is running 14psi.........feels good as

some times after 30min some times after 2hours of driving

the car wont boost above 10psi and feels sluggish

i pull the car over restart it and its fine again..........

What the f**k is that???

even when the car was on stock boost it did the same thing......

at first i thaught it was the fuel running though it but y is it alright when i just turn it off and start it again

help please.....

[ali-turko]

i got exactly the sAME PROBLEM WILL NEED HELP TO PLZ

[lwells]

Rich and retard maybe? I forget what the GT-R's threshold is. Have you checked the ECU for fault codes?

[warriorbrawl]

yeah your ecu could be going into safe mode if there is a problem somewhere eg fuel pump stuffed. Or is your intake pipes going soft and sucking shut causing a big restriction

[Sico04]

if it was the fuel pump what other symptoms would there be??

i just had the car returnd to me from ice performance after having some work done and they said it was 100% healthy

as i said the car doesnt do it all the time........it might go for a month with out doing it then all of a suddon there it is again

[ali-turko]

i don no its pissin me off!!!

some plz help

[rev210]

you have a heat related leak (both of you).

As the heat increases the rubber softens and allows some air to leak out. Sad to say but put a scewdriver to each and every one of your hose clamps might fix it

[Sico04]

heat related leak??

if this is so what is actually happening, does the computer relise whats going on and change settings?? cause some times i could be driving for 2 hours and it wont happen on a pretty warm day

other times i could do less then 30 min of driving

and why would simply restarting the car stop whats happening??

[Sico04]

could it have any thing to do with having the air con running???

[Sico04]

or low fuel ?? causing loss of pressure??

[AMS]

Had the same problem in my Stag....never found out what it was untill I blew the turbo

[rev210]

when things leak they usually do so almost randomly. If you haven't tried to check the tension on ALL of the intercooler pipes then I suggest you do so, if not only because you should do this on a regular basis as part of maintenence.

[ali-turko]

iv checked all the piping and did them up with a rachet so der all fine!!

i cant think of what else it cood be?

im changing the fuel filter tonite i got told it could be the fuel filter being blocked let u guys no if anything changes

[Robbo]

After a while when they heat up the car pings/predetonates which sends the ecu to the knock map, until it is restarted.

Unfortunatly the solution is better fuel, less ignition timing, or less boost.

[ali-turko]

will solve the problem if i put after martket ecu in??

coz im car will be getting on monday??

[lwells]

will solve the problem if i put after martket ecu in??

coz im car will be getting on monday??

<{POST_SNAPBACK}>

Yes, until you munch the pistons (unless you retune). Again, check for ECU error codes. If its going in to limp home (rich and retard) mode, its a pretty good indicator of detonation which will lunch your engine. Don't just stick a new part in without first working out what the problem is.

[Sico04]

how do i go about checking the error codes in the ecu????

ive done a fair few searches

[Sico04]

just called ice and they have suggested that it could be the afm's or coil pack possibly breaking down on hotter days..........or when things heat up

[Sico04]

its now booked into get a diagnostic done

few more things i have noticed bout what the car is doing

for about 2 weeks it wouldnt boost above 10psi and felt sluggish

few days ago it stopped, and boosted normally and every thing.......same weather.

today i was driving to work hit a hill was in 4th boost was on 14psi.......all of a sudden it just dropped back to 10psi........car still runs smooth....

i have noticed that it does it more if i am going up hills........

so i guess i have to wait 7 days till the diagnostic is done, then i will know exactly wtf is goin on

[Sico04]

no codes have been logged