Stock R32 Boost Levels?

[Mr. iNFMS]

Hey guys.. I got an r32 skyline,

Noticed yesterday car wasnt very as powerful as it has been (in the last couple of weeks). Im pretty sure I have a boost leak somewhere but im just after the stock boost level of a r32 gtst. On the stock gauge it reads about 5 and then dips down to 4.5 or 4psi.. im dead set it usually runs about 7.5

Anyone with any ideas please let me know.

Michael

[002doc]

Stock R32 boost 10 psi, the gauge in the dash is in mmHg, so it should go to about +7.5 I think , this equals about 10psi.

C heers

[Mr. iNFMS]

Cheers for that info!! Any ideas of why its not hitting the +7.5mmHg? It hits 4.5/5 and then drops slightly.. Would a small boost leak cause this?

[Cubes]

Mine with an exhaust saw 11psi.

I know of one running a 3.5" exhaust no cat that saw 12psi.

The +7mmg or what ever it is is ~14-15psi when I had mine on the dyno. Sitting just under the little + sign was ~11psi.

[govich]

http://www.skylinesaustralia.com/forums/in...howtopic=127647

[Cubes]

Nice find... backs up my findings.. I notice when turning the ignition on the boost guage flicks to the lower edge of the 0 line. So it would explain why my guage was reading a tad high.

[002doc]

yeah sorry to give u the wrong info mate, +7 is like 14 psi, 10 psi is between the mark and the +7 and thats the standard boost. If u add an exhaust u should get 11 psi.

Cheers

[boosted_andy]

dont go too much boost, turbo will chuck a hissy fit lol

[Cubes]

dont go too much boost, turbo will chuck a hissy fit lol

Mine was fine on 16psi for quite some time. Still is fine now; it has a little to do with luck of the draw, and how well the motor has been tuned with regards to NO detonation, mixtures are not lean and most importantly how hard its driven.

[barnoon]

Mine was fine on 16psi for quite some time. Still is fine now; it has a little to do with luck of the draw, and how well the motor has been tuned with regards to NO detonation, mixtures are not lean and most importantly how hard its driven.

Yeah its strange how some people say its crazy to boost a R32 turbo over 12 psi but I know of one guy whose been running his stock turbo on 18psi since he imported the car 5 years ago and it hasnt missed a beat once!

[mad082]

slightly off topic, i've been running my 33 at 14psi on the stock turbo for a few months now. haven't had any issues. people say they lose power after 12psi due to the turbo being out of its efficiency range, but 14psi feels faster than 12. i put it down to about 11psi for a few weeks, and it just felt dead.

[barnoon]

slightly off topic, i've been running my 33 at 14psi on the stock turbo for a few months now. haven't had any issues. people say they lose power after 12psi due to the turbo being out of its efficiency range, but 14psi feels faster than 12. i put it down to about 11psi for a few weeks, and it just felt dead.

Yeah I know what you mean my car made 166 RWKW on 14 PSI but Unigroup put it up to 18 to see how much more power it would make and it made close to 180 RWKW. (stock turbo)

[Cubes]

slightly off topic, i've been running my 33 at 14psi on the stock turbo for a few months now. haven't had any issues. people say they lose power after 12psi due to the turbo being out of its efficiency range, but 14psi feels faster than 12. i put it down to about 11psi for a few weeks, and it just felt dead.

I think what people mean is top end peak power doesn't increase much past 12psi.

The gains to be had by upping boost are through the mid range which essentially accelerates you quicker to the peak power. So.. the car feels quicker.

[mad082]

I think what people mean is top end peak power doesn't increase much past 12psi.

The gains to be had by upping boost are through the mid range which essentially accelerates you quicker to the peak power. So.. the car feels quicker.

if i only fang it up through the gears at high rpm it feels great. i think the problem is that so many people hear that it is bad to run them at high boost that they never do, then just tell everyone that they don't go any better without ever trying it themselves.

[r3225t]

my old stock 32 ran 11.5psi, you will always get an increase in power when u run more boost, just the increase per psi slowly drops as you go past the efficiency rate of the turbo