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R32 Gtr Boosting Too High

hj61vx

By hj61vx,
in Engines & Forced Induction

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hj61vx Newbie

hj61vx

Posted
Posted

Hi all,

I just recently purchased an R32 GTR. Just fitted a boost gauge and noticed that it boosts up to around 20PSI. I'm not sure if there are stock turbo's in this car ... i know at 20PSI, it is no good for stock turbo's.. question is, how do i reduce the boost back to safer levels? say 12PSI?

Thanks!

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Spurdo Experienced

Spurdo

Posted
Posted

at 20PSI this also no good for a stock engine (it will probably destroy it before long). i would start by finding the vacuum lines that come off the actuator on the turbos, make sure they are connected properly and follow them back looking for a split or a leak. or if someones fitted a boost tap you might find that somewhere along the lines. to reduce the boost pressure you first must find what has increased it.

if you cant work it out take it to a workshop (ideally one thats familiar with gtrs) they should be able to work it out pretty quickly.

right now you should assume it's stock standard as you dont know any different, so stay off the boost altogether until either a)its fixed. or b)you discover you have a built engine, aftermarket turbos and a tuned ecu.. lol

i'd like to think no one is wreckless enough to buy a gtr without asking the question "is it modified?" and get every detail if it is. neglecting this very simple step will result in you opening up a good ol' can of worms. i sort of made this mistake when i was 17 and it cost me dearly but we wont go into that.

Spurdo Experienced

Spurdo

Posted
Posted

only way really is to take off all the surrounding pipework to uncover them, if they are aftermarket they might have a brand name on the compressor cover, again probably a job for a tuning shop that knows their turbos and could positively identify them as there are some very minute external differences (if any) between a lot of turbos. if they are stock turbos that have been high flowed then it'll be even harder to tell. first thing i'd do is look at the compressor wheel, if its steel then its probably aftermarket. ceramic and it'll definately be stock, the ceramic ones dont like putting up with continued abuse.

EdGTR Enthusiast

EdGTR

Posted
Posted

No they dont! My R32 dropped the rear ceramic wheel a few months ago and the bits went back past the exhaust valves and destroyed my engine. You should see the scratches in the bores. Also if its still running the standard comp it will be having issues at that boost. its not the gauge is it. Can you borrow another one to double check?

lotsalag Contributor

lotsalag

Posted
Posted

I'd get it to a gtr experienced workshop asap. something is very wrong.

if they're stock turbos im surprised they're in one piece, if not stock and it has no other mods be very worried too!

fingers crossed its just a busted actuator hose, even so i'd be surprised if ur turbos or engine for that matter aren't damaged. :thumbsup:

Spurdo Experienced

Spurdo

Posted
Posted
sort of on the topic rb26 twin turbo setup the wastegate lever's attached to actuator rod with little CIRCLIP

any1 know a decent trick to getting them out without fkn around ... very tight spot

grow some ninja fingers. also use a small ultra fine flat blade screwdriver to flick it out maybe? and for the love of god dont drop the circlip.. it will vanish into thin air

Galois Veteran

Galois

Posted
Posted

^^^ +1 !!!!!!!!!!!!

yeah you can move it to the point where you can squeeze a screwdriver in there and prise it out, but sweet merciful fk don't drop it. i did and it landed on the plastic guard under the engine bay, the gf was not amused when i asked her to get it with her thinner arms, not amused at all haha

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