S14 Boost Issue - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Kaifd3s · 05-03-2012, 10:48 AM

Alright the car is an S14 with a S14 SR. When I go WOT the car gets 7lbs and slowly creeps up to 11. Now the thing is anwhere below 4500 the car instantly gets the 7lbs and stays dead on it. After about 4500 the boost creeps up to 11 but stays there and doesnt increase. Is this just normal creep? I thought if it was creep it would keep rising.

Thanks,
ALI

KendallH · 05-03-2012, 10:59 AM

What are you running for boost control? If someone installed the factory boost solenoid I believe that is its correct function

0wn3r · 05-03-2012, 11:09 AM

Sounds like what mine used to do. I'd say normal.

Kaifd3s · 05-03-2012, 12:33 PM

Where is the solenoid placed? Stock ECU, no boost controller.

ultimateirving · 05-03-2012, 01:13 PM

unlikely its a stock boost solenoid, normally they are not shipped over with the motorsets because the part is attached to the chassis. I think what ur seeing is pretty normal. look to see if you still have the stock WGA on the turbo.

Kaifd3s · 05-04-2012, 11:58 AM

Quote:

Originally Posted by ultimateirving

unlikely its a stock boost solenoid, normally they are not shipped over with the motorsets because the part is attached to the chassis. I think what ur seeing is pretty normal. look to see if you still have the stock WGA on the turbo.

Yea I still have the stock actuator on the turbo. What if I change out to one of those HKS wastegates? Would I get a steady boost pattern?

can24 · 05-04-2012, 12:47 PM

youll have a better boost pattern ,
your actuator is most likky going out
i recommend to change it, because my friends boost gauge was doing the same thing
,we replaced it and it was good but he got the stock actuator but i rather get the hks one

EJ8 944 · 05-04-2012, 09:20 PM

Check your engine bay to see if you have the factory boost control solenoid, there's been debate on whether the solenoid is only to help spool up time (with max boost at 7psi) or if the boost solenoid increases boost to 10-11psi.

Should be along the vacuum hose going to your wastegate actuator.

I'm interested on the results, I haven't read any solid proof anywhere about this matter.

Kaifd3s · 05-05-2012, 10:22 AM

I will try my best. Ill look through it when I go home (at work)

The funny thing is that until 4500 where it slowly goes up to 11lbs, its only at like .4 BAR which is like 5 or 6lbs not 7.

I have a Defi gauge so I recorded a coulpe WOT runs and was looking at them.

05-03-2012, 10:48 AM	#1
Kaifd3s Zilvia Addict Join Date: Feb 2008 Location: Tamarac, Florida Age: 35 Posts: 694 Trader Rating: (16) Feedback Score: 16 reviews	S14 Boost Issue Alright the car is an S14 with a S14 SR. When I go WOT the car gets 7lbs and slowly creeps up to 11. Now the thing is anwhere below 4500 the car instantly gets the 7lbs and stays dead on it. After about 4500 the boost creeps up to 11 but stays there and doesnt increase. Is this just normal creep? I thought if it was creep it would keep rising. Thanks, ALI __________________

05-03-2012, 11:09 AM	#3
0wn3r Zilvia Addict Join Date: Oct 2007 Location: CT Posts: 676 Trader Rating: (4) Feedback Score: 4 reviews	Sounds like what mine used to do. I'd say normal. __________________ 97 240sx se

05-03-2012, 12:33 PM	#4
Kaifd3s Zilvia Addict Join Date: Feb 2008 Location: Tamarac, Florida Age: 35 Posts: 694 Trader Rating: (16) Feedback Score: 16 reviews	Where is the solenoid placed? Stock ECU, no boost controller. __________________

05-03-2012, 01:13 PM	#5
ultimateirving Zilvia FREAK! Join Date: Nov 2010 Location: arizona Age: 33 Posts: 1,519 Trader Rating: (1) Feedback Score: 1 reviews	unlikely its a stock boost solenoid, normally they are not shipped over with the motorsets because the part is attached to the chassis. I think what ur seeing is pretty normal. look to see if you still have the stock WGA on the turbo. __________________ Z32 with lq4 swap Desert Street Scene \|\| Dssevents.com

05-05-2012, 10:22 AM	#9
Kaifd3s Zilvia Addict Join Date: Feb 2008 Location: Tamarac, Florida Age: 35 Posts: 694 Trader Rating: (16) Feedback Score: 16 reviews	I will try my best. Ill look through it when I go home (at work) The funny thing is that until 4500 where it slowly goes up to 11lbs, its only at like .4 BAR which is like 5 or 6lbs not 7. I have a Defi gauge so I recorded a coulpe WOT runs and was looking at them. __________________

05-03-2012, 10:59 AM	#2
KendallH Zilvia Addict Join Date: Jan 2011 Location: Clearwater, FL Level: Master Troll Age: 29 Posts: 871 Trader Rating: (3) Feedback Score: 3 reviews	What are you running for boost control? If someone installed the factory boost solenoid I believe that is its correct function

05-04-2012, 12:47 PM	#7
can24 Leaky Injector Join Date: Jun 2010 Location: upland Age: 29 Posts: 132 Trader Rating: (1) Feedback Score: 1 reviews	youll have a better boost pattern , your actuator is most likky going out i recommend to change it, because my friends boost gauge was doing the same thing ,we replaced it and it was good but he got the stock actuator but i rather get the hks one

05-04-2012, 09:20 PM	#8
EJ8 944 Zilvia Junkie Join Date: Aug 2009 Location: UT Age: 33 Posts: 557 Trader Rating: (8) Feedback Score: 8 reviews	Check your engine bay to see if you have the factory boost control solenoid, there's been debate on whether the solenoid is only to help spool up time (with max boost at 7psi) or if the boost solenoid increases boost to 10-11psi. Should be along the vacuum hose going to your wastegate actuator. I'm interested on the results, I haven't read any solid proof anywhere about this matter.

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