Jump to content
SAU Community

Recommended Posts

R33 boost spike issue

Hi all, I need to find a solution to fix a boost spike issue that my car has. It's a 1997 manual GTST, only mods are YJ coils, return flow FMIC, MBC and 3 inch turbo back exhaust.

Since I installed my front mount and dialled my boost up to 10/11 PSI I have noticed that when I punch it from 3.5 grand upwards the boost will spike to 12 or 13 PSI for a moment and then taper back to my set pressure. Just last night I installed a JJR bellmouth 3 inch dump pipe and now when I punch it, it will spike to 15 PSI! Would prefer not to launch my exhaust wheel out my exhaust, so I need to get this under control. Do I need an electronic boost controller or what?

 

Link to comment
https://www.sau.com.au/forums/topic/467794-r33-boost-spike-issue/
Share on other sites

I have a cheap 'Drift' brand MBC - would be I correct in believing that this is a bleed type MBC? Would I benefit from changing to a ball type MBC such as this? http://www.ebay.com.au/itm/Turbotech-manual-turbo-boost-controller-THE-ORIGINAL-and-still-the-BEST-/321155544509?hash=item4ac65cb5bd:m:mJ5Yk12EnMVqXBuR8UxKxhQ

1 hour ago, jhjones said:

connect the wastegate actuator hose directly to the intercooler pipe and see what happens

Okay, I did this. I saw 5 PSI when easing into boost and around 6-7 when stomping it from higher revs. I had a thought: perhaps with the addition of my front mount intercooler, the extra volume that has to be pressurised before results in the opening of the wastegate being delayed? If this was the case, would relocating the barb from the cold side to the hot side fix this?

13 minutes ago, djvoodoo said:

Why don't you just turn the boost down via the MBC??

Probably would have achieved the same result what as post above suggested, but it's done now. :P

Just to be sure, the stock solenoid has been disconnected and the other hose blocked properly right? Getting 5 and 7 suggests the stock solenoid is still in use. Are your psi readings from an aftermarket gauge? Stock one is not psi.

35 minutes ago, Sklyn said:

Just to be sure, the stock solenoid has been disconnected and the other hose blocked properly right? Getting 5 and 7 suggests the stock solenoid is still in use. Are your psi readings from an aftermarket gauge? Stock one is not psi.

Yes, actuator is connected straight to the nipple on the cold side of the intercooler piping, no stock solenoid. Readings are taken from an aftermarket boost gauge in PSI. The higher boost level that I'm getting isn't dependant on my RPM but rather how hard and fast the boost is coming on. 

Edited by Custard

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


  • Similar Content

  • Latest Posts

    • I've heard the Tomei USA head gaskets are decent if you want to o-ring the heads but otherwise not recommended.
    • The 296mm rotors are the R33 turbo brakes. The 310mm rotors are the R34 turbo brakes. The calipers are nearly the same, but not. They're the same caliper but the R34 caliper has longer legs so that it sits out far enough to go over the rotor. The pads are the same for both. When you say, "I bough tsome EBC"....did you just mean pads? Or rotors? 310mm rotors fit under 17" wheels. There may be some wheels without enough clearance though. I can't fit my fingers between the barrel of my wheel and the "corners" of my R34 calipers, but there is plenty of room behind the spokes. This is on Enkei RPF1. You can fit 324mm rotors inside a 17" wheel, but I'd be willing to bet that it would be close to impossible with the Nissan/Sumitomo caliper (using an adapter, of course), because the Sumitomo caliper is fatter than the Brembo caliper that is supposed to go on the 324mm rotors.
    • Hi. Can someone tell me what brakes(and mainly WHERE) can i buy brakes on R34 GTT? I bought some EBC which SHOULD go on my car(i have GT but it has GTT brakes) but it does not fit, Brakes are "too" small(296mm) Are 310mm be good or? I have 17 inch wheel so no "big boys" but for me driving i just need one that fits and i can get here in EU/Czech.
    • Since winter isn't that harsh anymore in Poland, i will definetely drive it 365 days a year 😉. But if the snow hits i will try it for sure and let U know. Only swap i am planning to do is of course R34 GTR front 😍.
    • Hey. Very valuable information about pitwork, I will pay attention when buying any consumable parts 🙏 As for the carpets - I got a handful of information from nengun, from which it appears that indeed the carpets for the driver's side are OEM. They are not able to show me any pictures due to the long chain of different sales entities but after I place the order, as soon as the goods arrive at the nengun warehouse from which they will send the shipment to me they can send me photos and if my purchase differs from OEM I can immediately return it / cancel the purchase. I think I will give it a try 😉. Of course i'll let you know what's what as soon as i get them P.s. I know the topic is not relevant to the thread, but both nengun and amayama have these SICK 😍 trunk room lamps available. Do you know anyone who ordered them? I need to have one in my car
×
×
  • Create New...