T28 Boost Issue (yes, I have searched!) - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Hammond · 08-31-2008, 08:58 AM

A mate and I have just finished fitting a T28 to my S13, got it running, set the Profec A at 1.0bar took it for a drive but both controller and mechanical gauge still read 0.7bar? I've checked for boost leaks and made sure all the pipes are tight. The turbo also came with a adjustable Forge actuator, but surely it won't make a difference if I'm running the Profec??

Just to add, I have the correct mods to support (STG2 chip, walbro, filter etc).

Thanks for your help.

Sileighty_85 · 08-31-2008, 10:47 AM

Do you have injectors? the 370cc max out after 10-11psi and will lean out after 5500rpms

so running 14psi is not a wise choice until you upgrade the injectors.

yes the adustable actuator will make a differnce loosen for less tighten for more

aNskY · 08-31-2008, 10:53 AM

ive never used a profec so i cant say for sure, but how do you know its at 1 bar? does it have auto boost setting? try upping the gain, you should see more boost

Z33dori · 08-31-2008, 11:14 AM

Quote:

Originally Posted by Sileighty_85

Do you have injectors? the 370cc max out after 10-11psi and will lean out after 5500rpms

so running 14psi is not a wise choice until you upgrade the injectors.

yes the adustable actuator will make a differnce loosen for less tighten for more

hmmm i had no problem when i was boosting 15+psi or the short period of running 22psi on my t25

had another friend we kept his SR T25 at 18psi for well over a year on stock injectors

DirtyS14 · 08-31-2008, 11:23 AM

If you have a H-Dev Stg2 chip then you need to keep the stock injectors and keep the boost at 1bar.

The actuator shouldn't make a difference because the controller should keep the wastegate closed/flapping until your boost setting is reached... Are you sure the controller has a good boost reference?

Also considering that you're in England i'm guessing you have a ca18det...

Sileighty_85 · 08-31-2008, 11:32 AM

Quote:

Originally Posted by Z33dori

hmmm i had no problem when i was boosting 15+psi or the short period of running 22psi on my t25

had another friend we kept his SR T25 at 18psi for well over a year on stock injectors

T28 will flow more volume of air than the T25.

Here my Dyno sheet Fully rebuilt/ built SR, I was running T28 .8bar Stock ECU, MAF, Injectors, Cams,

BlackTruenoAE86 · 08-31-2008, 11:35 AM

did you by pass the stock boost solenoid?

Osmosis · 08-31-2008, 08:28 PM

Make sure the dip switches on the prfec are correctly set. They might be set for if overboosting occurs and aren't letting it boost enough.

GReddy Profec

s15specR · 09-04-2008, 10:56 AM

having same problem with a Blitz SBC Spec R

08-31-2008, 10:47 AM	#2
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	Do you have injectors? the 370cc max out after 10-11psi and will lean out after 5500rpms so running 14psi is not a wise choice until you upgrade the injectors. yes the adustable actuator will make a differnce loosen for less tighten for more __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

08-31-2008, 11:23 AM	#5
DirtyS14 Zilvia Member Join Date: Sep 2007 Location: Odaroloc Posts: 190 Trader Rating: (2) Feedback Score: 2 reviews	If you have a H-Dev Stg2 chip then you need to keep the stock injectors and keep the boost at 1bar. The actuator shouldn't make a difference because the controller should keep the wastegate closed/flapping until your boost setting is reached... Are you sure the controller has a good boost reference? Also considering that you're in England i'm guessing you have a ca18det... __________________ S14 240SX aka "The Dirty S14" fizzerkart.com/s14.html

08-31-2008, 11:35 AM	#7
BlackTruenoAE86 Zilvia Member Join Date: Jul 2006 Location: San Antonio, TX Age: 32 Posts: 150 Trader Rating: (2) Feedback Score: 2 reviews	did you by pass the stock boost solenoid? __________________ -Emilio

09-04-2008, 10:56 AM	#9
s15specR Zilvia FREAK! Join Date: Oct 2007 Location: USA Posts: 1,021 Trader Rating: (18) Feedback Score: 18 reviews	having same problem with a Blitz SBC Spec R __________________

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08-31-2008, 10:53 AM	#3
aNskY Nissanaholic! Join Date: Apr 2005 Location: NY Age: 37 Posts: 1,604 Trader Rating: (10) Feedback Score: 10 reviews	ive never used a profec so i cant say for sure, but how do you know its at 1 bar? does it have auto boost setting? try upping the gain, you should see more boost

08-31-2008, 08:28 PM	#8
Osmosis Leaky Injector Join Date: Nov 2006 Location: Tacoma Posts: 87 Trader Rating: (0) Feedback Score: 0 reviews	Make sure the dip switches on the prfec are correctly set. They might be set for if overboosting occurs and aren't letting it boost enough. GReddy Profec