Jump to content
SAU Community

I'm Getting Bad Boost Cuts/boost Leak

Richy

By Richy,
in Engines & Forced Induction

 Share

Recommended Posts

Richy Rookie

Richy

Posted
Posted

my r33 gtst is boost cutting or leaking, i'm not quite sure which one it could be but basically whenever i boost more than 5 psi, boost just wont hold, it either spikes at high rpm's or i don't feel the boost at all. For example the other day i set the boost to about 9 psi and at full throttle it spikes a little (not much) to 4/5k rpm and past that it will just start cutting like it doesn't wanna go any further. So now it's set back to 5 psi but i need to get rid of this problem. I've been told so many different things like Coilpacks need to be changed, intercooler could be leaking cos a friend installed it not a mechanic, BOV could be leaking etc.

Link to comment
https://www.sau.com.au/forums/topic/167012-im-getting-bad-boost-cutsboost-leak/
Share on other sites
mad082 Grand Master

mad082

Posted
Posted

do you have a front mount? if you do where do you have the controller taking its reading from? if it is from the bov hose then relocate it. have a nipple installed on the hot intercooler pipe.

what does the cutting feel like? is it a hard start/stop? or is it like a spluttering? if it is a spluttering then try gapping your plugs down, and taping up your coils.

bubba Grand Master

bubba

Posted
Posted (edited)

I had the similar symptoms the other day on my 32.. a hose clamp had popped off but the pipe was still in the hose (i.e. it hadn't popped all the way off). Was driving back from the shops and it would start to spool then at 4k it would kind of cut out.. I've had a hose pop right off on the highway once before and could barely keep the thing idling and driving it to the nearest exit was a complete bastard.

This time I could still drive if didn't go over 4k.. got home, popped the bonnet and found a hose clamp where the cooler piping joins the crossover pipe had let go :)

BUT could be the stock ECU's fuel cut happening on your 33 :)

Edited by bubba
mad082 Grand Master

mad082

Posted
Posted

bubba you could be onto something there. if you had a hose that wasn't sitting on right, and once it had a fair bit of force on it it was opening a gap up it would cause a loss of boost pressure and the car to run overly rich, which could be the cause of this issue. it would be worth checking the cooler piping.

Richy Rookie

Richy

Posted
  • Author
Posted

i'm gonna try taking off the intercooler and connecting it straight to the turbo, the cut feels like the airs just spluttering everywhere its spooling but just feels like its going nowhere. i got a stock ecu. I'll post results of the intercooler removal tommorow. thanx

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • The Bogan
      Neil's R33 Gts-t Build

      By The Bogan · Posted

      It was a great, but typical track day, and some VB was ingested at the night time debrief 🤪
    • Duncan
      Neil's R33 Gts-t Build

      By Duncan · Posted

      And so, to round this out, I couldn't be happier to confirm @MBS206 has decided to buy the car. He drove down from sunny QLD with a trailer last week and it is off to its new home today. I'll let Matt confirm on next steps but I understand broadly that the plan is to leave it pretty much as is, and just get some quality wheel time with a nicely balanced car that is pretty much track ready. There are a few a jobs still to be done first but nothing too major and I think its a very smart buy Dinner last night at the Paragon with a round of VBs (mostly) for Neil
    • Duncan
      Neil's R33 Gts-t Build

      By Duncan · Posted

      Well, 50 pages and the end of a chapter for this car. We took it out for a shakedown at Wakie yesterday, and everything went well. There were a couple of niggles: - Oil cooler fitting leak - tightened, cleaned, stopped leaking - Radiator cap overflow fitting was leaking....Mark called it, the overflow fitting was threaded in and not tight....tightened, tested and held pressure - Small oil leak at the rear of the block, probably the turbo oil feed - too hot to get at it comfortably but probably just needs to be nipped up - leak at the driver's side rear brake line where it meets the hardline. Fitting wasn't loose, so Matt backed it off and back on, no further leaks - there's also a leak somewhere on the top of the fuel tank, maybe that cross over fuel line - that was has been left to fix when its on a hoist Otherwise than those niggles the car went great, turned great and stopped great so it was a very successful day out. I'm always really nervous when a car first hits the track after a long break, especially with a brand new engine as well but it was great. VID-20251011-WA0007.mp4  Big thanks to @The Bogan who dropped by and helped out, @MBS206 and my nephew Lachlan the apprentice.  Neil's wife Mel also surprised the hell out of all of us by dropping by; she's up in Tamworth these days but was travelling to Melbourne so had plausible deniability for turning up at the garage, it was great to see her but also obviously a bit sad all round.
    • perry_r33
      Skyline R33 Sedan Tail Lights S2 - (2 SETS Available) Silver & Grey

      By perry_r33 · Posted

      Skyline R33 Series 2 sedan tail lights in excellent condition. These are becoming harder to find, especially in this state.    BOTH SETS ARE IN FANTASTIC CONDITION (REFER TO PHOTOS)    ✅ No broken covers or cracks ✅ Lenses are in flawless condition ✅ All rear mounting lugs intact ✅ Comes complete as pictured ✅ Perfect for restoration, replacement, or upgrade   These lights are ready to go, no surprises just quality OEM parts.   These are definitely one of the better sets we have seen in a while. With minimal wear and tear they will come as you see. Bear in mind they are not brand new they are almost 30 years old now. To find them in this condition isn’t easy they can only be obtained on the second hand market.   Australia Wide Postage Available At Buyers Expense. Silver Set:$850 Grey Set:$850 PM Me for purchase or any other questions  IMG_2166.dng IMG_2165.dng IMG_2172.dng IMG_2173.dng IMG_2174.dng IMG_2179.dng IMG_2180.dng IMG_2260.dng IMG_2258.dng IMG_2259.dng IMG_2261.dng IMG_2266.dng IMG_2273.dng IMG_2274.dng IMG_2276.dng
    • GTSBoy
      First time Skyline owner

      By GTSBoy · Posted

      Unsolicited advice? Keep the engine as close to stock as you can. Nothing wrong with adding some boost and making a little more power, but given where you are, you really don't want to try to make it into a monster. I can't imagine the roads are up to it, and the lack of locla support when it grenades will be a ball ache. FWIW, If there is a dyno around that you can access, then brand new injectors are a good idea, which will lead you to (at least) putting a Nistune in it, which will allow you to put an R35 AFM on it, all of which will make it possible to make it much much nicer to drive and live with.
×
×
  • Create New...