R33 GTS-t stuck on low boost - Skyline Owners Club

rozzer1275 · 18th August 2008, 09:58 AM

finaly got round to fitting a boost gauge to my standard gts, but i'm only getting 4-5psi boost

I was thought that the boost was ment to go up to 7psi after 4500rpm.

i have replaced the boost control solenoid but still the same (have not yet tested new solenoid).

anyone any ideas

**Spearmint** · 18th August 2008, 12:13 PM

Weak actuator spring.

rozzer1275 · 18th August 2008, 02:21 PM

I have tried a manual boost bleed valve and i can up the boost with that but it gains a misfire at 4,500 rpm, still think actuator is worth a look at?

**Spearmint** · 18th August 2008, 08:46 PM

Well it can't hurt, take it off and test it for when it opens.

That won't be a missfire by the way, sounds like boost cut.

kaminari · 29th August 2008, 07:05 PM

Either this possibility by priority check:

1. Hose leak (boost or i/c)
2. Intercooler leak
3. Turbine blown, Fin wreck
4. Weak actuator
5. Solenoid malfunction
6. Lost engine compression (Headgasket leak/blown)

Normal boost kick in about 3000rpm, 0.5bar (7psi) ...peak on 3rd gear full throttle 0.7 bar (10PSI) at 5500rpm when VTC kick in.STD ECU comes with Boost cut feature at 0.9bar (13PSI)

**RoboPope** · 29th August 2008, 07:31 PM

if you are measuring this with the built in boost guage that isnt showin psi

18th August 2008, 09:58 AM	#1
rozzer1275 Skyline Enthusiast Registered User Join Date: Jan 2008 Posts: 4	R33 GTS-t stuck on low boost finaly got round to fitting a boost gauge to my standard gts, but i'm only getting 4-5psi boost I was thought that the boost was ment to go up to 7psi after 4500rpm. i have replaced the boost control solenoid but still the same (have not yet tested new solenoid). anyone any ideas

18th August 2008, 12:13 PM	#2
Spearmint Per Ardua Ad Astra Area Rep Membership No. 461 Join Date: Jan 2006 Location: A shithole County: Northamptonshire Drives: Project Spearmint Posts: 7,432	Weak actuator spring.
	__________________ PROJECT SPEARMINT \| BUILT BY SP AUTOS \| TUNED BY ABBEY MOTORSPORT iF IT AIN'T BROKE DON'T FIX IT.......AND IF IT IS, LOOK LIKE YOU KNOW HOW TOO....

18th August 2008, 08:46 PM	#4
Spearmint Per Ardua Ad Astra Area Rep Membership No. 461 Join Date: Jan 2006 Location: A shithole County: Northamptonshire Drives: Project Spearmint Posts: 7,432	Well it can't hurt, take it off and test it for when it opens. That won't be a missfire by the way, sounds like boost cut.
	__________________ PROJECT SPEARMINT \| BUILT BY SP AUTOS \| TUNED BY ABBEY MOTORSPORT iF IT AIN'T BROKE DON'T FIX IT.......AND IF IT IS, LOOK LIKE YOU KNOW HOW TOO....

29th August 2008, 07:31 PM	#6
RoboPope Skyline Owners Club Club Member Membership No. 010 Join Date: Jan 2006 Location: Highgate, London County: London Drives: Miss Daisy Posts: 1,131	if you are measuring this with the built in boost guage that isnt showin psi
	__________________ According to the man in the street I am a ** AbbeyMotorsport** ECR33 with RB30, FCON Pro, 500bhp @ 1 bar. The R is quite nippy too

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18th August 2008, 02:21 PM	#3
rozzer1275 Skyline Enthusiast Registered User Join Date: Jan 2008 Posts: 4	I have tried a manual boost bleed valve and i can up the boost with that but it gains a misfire at 4,500 rpm, still think actuator is worth a look at?

29th August 2008, 07:05 PM	#5
kaminari Skyline Enthusiast Registered User Join Date: Jul 2007 Location: Tokyo County: Outside UK Drives: R33GTSt Series 1 R33GTSt Series 2 Posts: 19	Either this possibility by priority check: 1. Hose leak (boost or i/c) 2. Intercooler leak 3. Turbine blown, Fin wreck 4. Weak actuator 5. Solenoid malfunction 6. Lost engine compression (Headgasket leak/blown) Normal boost kick in about 3000rpm, 0.5bar (7psi) ...peak on 3rd gear full throttle 0.7 bar (10PSI) at 5500rpm when VTC kick in.STD ECU comes with Boost cut feature at 0.9bar (13PSI)

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