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R32 Gt-R Factory Boost Restriction

Samuel Leonard
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Samuel Leonard Rising Star

Samuel Leonard

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I just removed mine and literally noticed no difference? is it a tiny difference that you hardly notice? couldn't even see the vacuum meter change. i know it's not a great means of measuring boost but the maximum it ever gets is 350 mm of mercury (hg) i thought it would boost much harder? but still pretty much exactly the same? anything else i was supposed to do? what is the electrical wiring to the PCM?

post-70516-0-82030500-1295596272_thumb.jpgpost-70516-0-29469700-1295596298_thumb.jpgpost-70516-0-11304700-1295596309_thumb.jpg

Edited by Samuel Leonard
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Samuel Leonard Rising Star

Samuel Leonard

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Are you using a boost controller already?

not that i am aware of. car's got a dyno sheet stating it puts down 180 kilowatts. i'm an apprentice mechanic and i've had a good look around the engine bay and can't see anything? does this restriction usually make a pretty big difference?

Samuel Leonard Rising Star

Samuel Leonard

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an r32 gtr with restrictor out should boost 14.7 psi with full exhaust

well i definitely don't get anywhere near this. not even sure if it'd be getting over 8. it's in bar so it's not easy to tell. but 14 psi would be near the 750mm of mercury on the standard vaacuum meter and it's still at 350. i'm fairly confident it made no difference at all...

  • 2 months later...
CabbageMS Rookie

CabbageMS

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Posted

Hey dude, did you ever find the answer to this? I have exactly the same situ except mine boosts just above the mark between 0 and +7 on the boost gauge. So slightly more boost than you according to the gauge but it didnt change when I removed my boost restrictor. Again no aftermarket boost control.

  • 4 weeks later...
Samuel Leonard Rising Star

Samuel Leonard

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  • Author
Posted (edited)

Hey dude, did you ever find the answer to this? I have exactly the same situ except mine boosts just above the mark between 0 and +7 on the boost gauge. So slightly more boost than you according to the gauge but it didnt change when I removed my boost restrictor. Again no aftermarket boost control.

mine was an easy fix. there are 2 restrictors, not just one in the line with the yellow band, but one in the other line to the PCM. it changed mine from .55 bar to .75 bar. .75 is just above the 350mm mercury line on the standard vacuum meter/boost meter.i'd estimate 500 to 550mm mercury.

Edited by Samuel Leonard

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