Boost Issues

[legend]

Hey all,

don't know if anyone has experienced this one before.... I've got a bleed valve on it to bring it up to about 10PSI but through the rev range it only hits to 10psi after it revs past 4000rpm. anything below that, its still at the stock 7psi. Can anyone help with any 'constructive' suggestions to fix this problem???

[rs73]

Bleed valve is a cheap way to increase your boost, but not as reliable as Electronic Boost Controller one. solution perhaps is to get a proper electronic boost controller like Apex'i AVC-R or HKS EVC.

I have a bleed valve as well, still saving money to get an EBC.

[Hicks]

Probably because the stock turbo cant make more than 7 pounds of boost below 4000 revs.

[sil21jun]

isn't stock at 0.7 bar not 7 psi?

[rs73]

no, stock is 7psi or around 0.5 bar I think for R33. R32 may run a bit higher stock boost

[legend]

yeah, stock turbo, stock boost is 7psi

[sil21jun]

I got 10psi for my standard boost on my silvia and my housemate GTR has 0.7 bar as well. But I have heard too many people saying that their stock boost is 7psi... doesn't matter I guess, ultimately, everyone wish to bring it over 15psi.

Cheers!

[croat]

What bleed valve do you have. Some of the valves are gated and apparently bring boost on harder and faster... I have a bleed in and it goes right up to the amount set at low revs...

[qikr33]

it sounds like your bleed valve is the problem.What type is it.Does it make a hissing noise at idle?Also is your stock boost regulator still connected?

[legend]

I don't know... I'll see if I can get a pic of it.

[TTT]

for $135 you can get the Turbo XS High Performance Boost Controller (HPBC)

it has 2 adjustments.

1 = increase boost

2 = reduce or eliminate wastegate creep.

the second adjustment is what makes the boost come on earlier and harder.

R33's standard boost is 7psi.

R32 is more like 9 or 10psi standard.

as mentioned, if you put a boost controller on, you need to use that INSTEAD of the standard boost solenoid...

[Guest INASNT]

Originally posted by Hicks

Probably because the stock turbo cant make more than 7 pounds of boost below 4000 revs.

i doubt it as the r33 series 2 spools up real quick coz of the plastic comp wheel.

at the moment with my half complete project i can get 12psi boost at just under 2000rpm with lightened flywheel, adj cam gear and pfc tune.

Legend

I think you have your stock boost solenoid still connected in the line. Bleed valves are cheap and nasty, dont ever expect good boost control with them.

[predator]

you're not reading the boost off the factory boost guage are you?

otherwise you probably have some kind of boost leak elsewhere.. so check all your joints and hose connections..

[legend]

INASNT: me thinks I'm going to have to invest in an EBC... $$$

predator666: nope, got a greddy boost gauge

[Guest INASNT]

Originally posted by legend

INASNT: me thinks I'm going to have to invest in an EBC... $$$

predator666: nope, got a greddy boost gauge

yes you better. I think my greddy profec b spec 2 also helps bring boost on early!! Only think with the spec 2 is that you have to *** around with it alot to get it to work the way you want

[predator]

yer.. with my profec it comes on at about full boost at about 3500rpm from what i remember.. not bad considering just S-AFC, zortst, cooler combo. it'll make a difference..

really depends on the bleed valve.. some are worse than others..

[legend]

3500rpm... hmmm, if that's the case, it may not be worth going for a EBC, I was hoping for something around the 2800rpm mark but it sounds like it's wishful thinking...

[Guest INASNT]

Originally posted by legend

3500rpm... hmmm, if that's the case, it may not be worth going for a EBC, I was hoping  for something around the 2800rpm mark but it sounds like it's wishful thinking...

did u not read my post??

my series 2 turbo is making 12psi by 2000rpm.

[legend]

yeah but I don't have a pfc, or any other major mod other than an exhaust.... looking to get an intercooler soon but that's about it!