Can't get over stock boost.. (7 PSI)
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Can't get over stock boost.. (7 PSI)
I've already ran this by all of my 300ZX forums, and nobody seems to have anymore suggestions... here's the details:
Stock 85 Nissan 300ZX Turbo.. installed B&S MBC, cheapie.. ran it, set it to 10PSI, no problems. Ran a buddy of mine in a few friendly races, then did some donuts in the gravel. Came back, and the boost won't go over 7 PSI no matter what I set it to. Stock POV removed, plugged with 1/4 NPT fitting... aftermarket boost guage... the clutch roasted, got it replaced, now still sitting with the 7PSI problem... if you guys have any suggestions, I'd appreciate it. Thanks.
Stock 85 Nissan 300ZX Turbo.. installed B&S MBC, cheapie.. ran it, set it to 10PSI, no problems. Ran a buddy of mine in a few friendly races, then did some donuts in the gravel. Came back, and the boost won't go over 7 PSI no matter what I set it to. Stock POV removed, plugged with 1/4 NPT fitting... aftermarket boost guage... the clutch roasted, got it replaced, now still sitting with the 7PSI problem... if you guys have any suggestions, I'd appreciate it. Thanks.
#2
Re: Can't get over stock boost.. (Dramier)
Try a different boost controller, or do a quick blast with the line open. (I mean quick.) Is it taking longer to hit 7 psi than it did before?
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Re: Can't get over stock boost.. (Dramier)
Your problem is that the MBC is stuck open. 7psi is your stock setting, right?
I've had nothing but problems with MBCs. Mine got stuck closed, which is a much bigger problem then you have!
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Re: Can't get over stock boost.. (Dramier)
if i'm not mistaken, those cars have a feature called a "pop off valve" to prevent creeping or boost spiking. It probably only allows 7psi. Try a search on that
#6
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Re: Can't get over stock boost.. (zojirushi)
if i'm not mistaken, those cars have a feature called a "pop off valve" to prevent creeping or boost spiking. It probably only allows 7psi. Try a search on that
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OK..
Stuck MBC: Ok, I'll take a look at the MBC and see about that.
Popoff Valve: Yes, it HAD a POV. In the original posting I explained what I did with it.. Thanks for the suggestion though.
Thanks for the replies, and if anyone else thinks of anything, please let me know.
Popoff Valve: Yes, it HAD a POV. In the original posting I explained what I did with it.. Thanks for the suggestion though.
Thanks for the replies, and if anyone else thinks of anything, please let me know.
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