R34 gtr boost limiter?

[langy0009]

R34 gtr boost limiter?

Hey guys, so pretty much important myself a bayside blue 2000 r34 GTR, been super keen to get this car for the last couple months waiting, and today was the day to pick it up and drive it home, first 10 minutes car was a dream looked felt amazing just wanted I wanted, then... a problem started so  symptoms are this,

- start the car turbos/boost everything runs great, give it some gas and the turbos spool up to about 1 bar ( which I didn't think was stock boost settings but anyway ) 

then 5-10 minutes later I will go to just Accelerate normally and it will start to spool but when it gets to around .4 bar it will cut all the boost and the car will act like it has a speed limiter and not getting any air in, after that I had to keep driving the car in a higher gear to make sure it never gets into + boost because it would loss all power and not run, in 6th gear it will spool to around .2-3 bar at about 110 but as soon It gets over that bam cuts out again.

if I turn the car off and back on, problem immediately  goes away and car runs perfect again, then all of a sudden will start up again a couple of minutes later, watching the boost gage on MFD I can see it climbing into + boost then all of a sudden drops fully down ( with no wastegate noise or anything ) and the car staves for air.

any ideas of what it could be would be amazing, it's kinda put a downer on my excitement for getting this car, and really hurts when I still have a 1000km trip home with no boost 

 

[GTSBoy]

Coilpacks or some other electronics packing the shits when they get hot enough would be my guess.

[langy0009]

It's also not throwing a check engine light 

so I though coils would do that ??

[GTSBoy]

Nope.  Coils is just a misfire.  ECU is not that clever.

[langy0009]

So I think it's going into a 'safe mode ' is that a thing ?

[GTSBoy]

Unplug the AFMs.  Then you will know what "safe mode" feels like.

[No Crust Racing]

Bummer, but these old cars need TLC like any other. 

If it happens only when the car is warm it could be vac line that expands, could be bad sensor (I once had a bad CAS and an O2 that would only play up warm). AFMs with dry solder joints can also play up when warm if they are only just started to go. 

You need to pop the bonnet and get in there for a look. Dos a boost leak test, get a field services manual and multimeter and test some sensors. If you are not comfortable with those basic testing things take the car to a workshop that knows RBs. 

Factory ECU? You can buy a consult cable (I think like $100?) and download ECUTalk for free.

 

[langy0009]

Seem to fix the problem, have driven about 600 more Kms and if hasn't gone into limp mode so that's always good, I pretty much unplug all the easy to get to cables blew them out and plugged the back in, someone I know also thinks that it could be because the car wasn't driven for 7-8 months that it could have build up somewhere and driving has fixed it 

 

cheers heaps for advice and help 

time to enjoy the car now 

[No Crust Racing]

If you're unplugging things again in the future, a little contact cleaner is a good idea.

Pics?