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Car: R33 gtst 1994

MODS: apexpi pfc

nismo fuel reg

slide performance highflow turbo stage 3

hiflo exhaust 3inch-split dump

bosch fuel pump internal

z32 afm

garret wastegate acuator new

15 psi

tuned

My problem is when i reach around 5-6000 rpm it looses power,and boost reading drops excessivley as if somthing has blocked the air intake.

has anybody had this problem?i have checked all pipes and fittings?

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I've got this exact same problem. Sometimes I get a loud whistling type sound in the higher RPMs. I've only got some basic bolt on mods, FMIC, split front/dump pipe, high flow cat, manual b/c at 10psi. Mine drops off to next to no boost past 5000rpm. My friends Dad had a look at it tonight, he's a nissan mechanic. We weren't able to solve the problem unfortunately. Got us pretty stumped.

your joking john isnt that silicon hose sposed to eliminate that problem (sucking close) if so its a complete waste of money,im gonna put my stock inlet pipe on and reinforce it,did the problem go away for you onced rienforced??

I regret buying it, wasted $150... was pretty worthless! Re-enforced it all sweet, I don't get a boost drop anymore!

if you squeeze it you'll notice its actually softer than the stock pipe!

  • 2 weeks later...

If your intake pipe is sucking closed, that suggests to me that your air filter is too restrictive. Take the air filter off and go for a quick drive, see if it's still an issue, but avoid any dirt roads!

Edited by Ionos

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