why does my SR20det run 10psi when should 7psi stock - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

RedTopDrifter01 · 10-05-2009, 12:28 PM

hello i have a 91 s13 silvia and its totally stock except hks intake and hks exhaust, but it runs 10psi instead of 7psi which is stock amount what could be wrong? it dosent have a boost controler just boost gauge and the gauges vaccum source is the right place. Anyone know why it does this? the car also has hesitation when giving it gas quickly istead of graduatly even though it spools up quick when stepping on it still hesitates.

WISH ONE · 10-05-2009, 01:25 PM

check all your vacuum lines for any obstructions, sometimes people put restrictors in the vac lines to increase boost.

Om1kron · 10-05-2009, 01:32 PM

who put the turbo on? check your gate on the turbo... make sure there are no (extra) washers where the bulk of it bolts up. It's a ghetto boost adjustment most people do to get 3 more psi out of their turbo.

That's how mine is, I boost 10lbs.

lazysk8er2 · 10-05-2009, 01:42 PM

i thought oem boost is 11psi factory...the wastegate is set for 7psi spring

hailandkill · 10-05-2009, 05:43 PM

Quote:

Originally Posted by Om1kron

who put the turbo on? check your gate on the turbo... make sure there are no (extra) washers where the bulk of it bolts up. It's a ghetto boost adjustment most people do to get 3 more psi out of their turbo.

That's how mine is, I boost 10lbs.

OT but do you have a pic of this?

Team DET · 10-06-2009, 12:05 AM

Quote:

Originally Posted by hailandkill

OT but do you have a pic of this?

i second that

ILoveMyRHS13 · 10-05-2009, 10:18 PM

They run 12lbs from the factory, FYI. Most people don't have the BOOST SOLENOID, which causes them to run 7lbs.

JVD · 10-06-2009, 09:10 AM

Quote:

Originally Posted by ILoveMyRHS13

They run 12lbs from the factory, FYI. Most people don't have the BOOST SOLENOID, which causes them to run 7lbs.

This is correct... except I believe stock is 11lbs.

Could be wrong.

lazysk8er2 · 10-06-2009, 10:05 AM

Quote:

Originally Posted by ILoveMyRHS13

They run 12lbs from the factory, FYI. Most people don't have the BOOST SOLENOID, which causes them to run 7lbs.

Well pretty sure its set at 11lbs and he is ALSO from Canada and says it is a silvia which in turn COULD MEAN he has a rhd imported s13. Which COULD MEAN he didnt do any swap so it came with the sr20 which in turn WOULD most likely have the factory BOOST SOLENOID.

BUT he didnt specify so cant really tell ya.

just read this:
http://zilvia.net/f/tech-talk/208005...4-sr20det.html

Check your routing something is fudged.

sr20silvia91 · 11-29-2009, 01:42 PM

Quote:

Originally Posted by lazysk8er2

Well pretty sure its set at 11lbs and he is ALSO from Canada and says it is a silvia which in turn COULD MEAN he has a rhd imported s13. Which COULD MEAN he didnt do any swap so it came with the sr20 which in turn WOULD most likely have the factory BOOST SOLENOID.

BUT he didnt specify so cant really tell ya.

just read this:
http://zilvia.net/f/tech-talk/208005...4-sr20det.html

Check your routing something is fudged.

newb question... i checked my car and my wastegate has a tube going to the manifold plastic then that means i dont have a factory boost selinoid, right? if so am i getting robbed of boost? and if i dont have one can i replace it with a manual boost contoler?

RedTopDrifter01 · 10-06-2009, 10:58 AM

Yes exacly I'm from Canada and it is a end with factory motor and the solinoid it should run 7like to of my other friends silvias and they are stock to just the same as me

JVD · 10-06-2009, 11:15 AM

Quote:

Originally Posted by RedTopDrifter01

Yes exacly I'm from Canada and it is a end with factory motor and the solinoid it should run 7like to of my other friends silvias and they are stock to just the same as me

NO.

If you have the factory solenoid you will run 11psi.

If you run straight off the wastegate you'll only get 7psi.

PS. Try to punctuate. Your shit makes no sense.

reeskm · 02-15-2010, 06:55 AM

The factory had pretty poor boost control. It's designed to only work with the stock intake and exhaust. As soon as I put on a 3" turbo back exhaust and huge cone k&n filter, and replaced all my vacuum lines, I got 10 or 11 psi.

AFAI, there is a "hack" that gets you most boost from the factory. It involves removing a factory restriction that is hidden in a vac line going to the waste gate solenoid. Replacing this and your vac lines will give you a boost increase of 3psi or so.

Skyline GTRs had a red restriction you could remove that would increase the boost. It was there to decrease stock HP but could be removed in seconds to give you free factory boost. It seems the JDM market S13s had the same deal. Too bad I threw out all that junk years ago otherwise I'd go hunting for the specific line and take a photo for you.

rb25_s13*CHUKI · 02-15-2010, 07:52 AM

Stock factory boost Is 7 psi. I've owned 7 sr20's. I've swapped them all In my self and watched them boost 6-7 psi. You should look for a bent/tweaked Actuator arm. That's a common trick people use to up the boost a few pounds or check for added washers on the acuator mounting bolts. I added spacers with 3 inch elbow,down pipe and straight pipe and I held a steady 12 psi. without spacers and the same exhaust set-up It held a steady 7 psi.

ILoveMyRHS13 · 02-16-2010, 12:50 AM

Quote:

Originally Posted by JVD

NO.

If you have the factory solenoid you will run 11psi.

If you run straight off the wastegate you'll only get 7psi.

PS. Try to punctuate. Your shit makes no sense.

Quote:

Originally Posted by rb25_s13*CHUKI

Stock factory boost Is 7 psi. I've owned 7 sr20's. I've swapped them all In my self and watched them boost 6-7 psi. You should look for a bent/tweaked Actuator arm. That's a common trick people use to up the boost a few pounds or check for added washers on the acuator mounting bolts. I added spacers with 3 inch elbow,down pipe and straight pipe and I held a steady 12 psi. without spacers and the same exhaust set-up It held a steady 7 psi.

Maybe people will learn one day that stock boost for an SR is NOT, I repeat NOT 7LBS

Sako · 02-17-2010, 01:50 AM

I had a JDM S13 with the original SR that came in it from the factory, and I was getting 11 lbs of boost. Most people that do SR swaps don't install the factory boost solenoid because it's mounted on the shock tower, and since they buy a motor and not a clip, they don't get the boost solenoid. Also, as reeskm said, there was a factory restrictor in one of the lines. It is usually found in the line that goes from the boost solenoid to where it's tee'd off. It can be easily located by looking for a white band towards the end of the vacuum line. Removing this line and replacing it with a normal vacuum line gets you 11 lbs. The car will only boost 7 lbs if the wastegate is connected directly (which is not the way it comes from the factory) since the spring is set for 7 lbs.

Leroy_Stickshift · 11-10-2010, 11:10 AM

this is how i ran my vaccuum lines.

no solenoid's or charcoal canister.

1990 sr hatch · 04-27-2012, 01:12 AM

Quote:

Originally Posted by Leroy_Stickshift

this is how i ran my vaccuum lines.

no solenoid's or charcoal canister.

what is the third port under the throtle body used for? im in need of knowledge i have a blacktop if this helps

Leroy_Stickshift · 11-10-2010, 11:14 AM

and thats where your boost solenoid/ignitor/other shit is located. i believe its the one connected to the green clip? maybe its both??

im sure someone else in here can clarify, pictures always help though

10-05-2009, 12:28 PM	#1
RedTopDrifter01 Join Date: Sep 2009 Location: AB, Canada Age: 29 Posts: 26 Trader Rating: (0) Feedback Score: 0 reviews	why does my SR20det run 10psi when should 7psi stock hello i have a 91 s13 silvia and its totally stock except hks intake and hks exhaust, but it runs 10psi instead of 7psi which is stock amount what could be wrong? it dosent have a boost controler just boost gauge and the gauges vaccum source is the right place. Anyone know why it does this? the car also has hesitation when giving it gas quickly istead of graduatly even though it spools up quick when stepping on it still hesitates.

10-05-2009, 01:25 PM	#2
WISH ONE Post Whore! Join Date: Aug 2006 Location: orange county ca Posts: 2,738 Trader Rating: (13) Feedback Score: 13 reviews	check all your vacuum lines for any obstructions, sometimes people put restrictors in the vac lines to increase boost. __________________ PARTING/SELLING MY COUPE. PM ME.

10-05-2009, 01:32 PM	#3
Om1kron Post Whore! Join Date: Sep 2004 Location: Simi Valley, CA Age: 40 Posts: 6,879 Trader Rating: (15) Feedback Score: 15 reviews	who put the turbo on? check your gate on the turbo... make sure there are no (extra) washers where the bulk of it bolts up. It's a ghetto boost adjustment most people do to get 3 more psi out of their turbo. That's how mine is, I boost 10lbs. __________________ Wayne

02-15-2010, 07:52 AM	#14
rb25_s13*CHUKI Post Whore! Join Date: Mar 2007 Location: Cali Age: 32 Posts: 2,759 Trader Rating: (16) Feedback Score: 16 reviews	Stock factory boost Is 7 psi. I've owned 7 sr20's. I've swapped them all In my self and watched them boost 6-7 psi. You should look for a bent/tweaked Actuator arm. That's a common trick people use to up the boost a few pounds or check for added washers on the acuator mounting bolts. I added spacers with 3 inch elbow,down pipe and straight pipe and I held a steady 12 psi. without spacers and the same exhaust set-up It held a steady 7 psi. __________________ Obliterate

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10-06-2009, 10:58 AM	#11
RedTopDrifter01 Join Date: Sep 2009 Location: AB, Canada Age: 29 Posts: 26 Trader Rating: (0) Feedback Score: 0 reviews	Yes exacly I'm from Canada and it is a end with factory motor and the solinoid it should run 7like to of my other friends silvias and they are stock to just the same as me

02-15-2010, 06:55 AM	#13
reeskm Leaky Injector Join Date: Jun 2006 Location: Calgary, Canada Posts: 50 Trader Rating: (0) Feedback Score: 0 reviews	The factory had pretty poor boost control. It's designed to only work with the stock intake and exhaust. As soon as I put on a 3" turbo back exhaust and huge cone k&n filter, and replaced all my vacuum lines, I got 10 or 11 psi. AFAI, there is a "hack" that gets you most boost from the factory. It involves removing a factory restriction that is hidden in a vac line going to the waste gate solenoid. Replacing this and your vac lines will give you a boost increase of 3psi or so. Skyline GTRs had a red restriction you could remove that would increase the boost. It was there to decrease stock HP but could be removed in seconds to give you free factory boost. It seems the JDM market S13s had the same deal. Too bad I threw out all that junk years ago otherwise I'd go hunting for the specific line and take a photo for you.

02-17-2010, 01:50 AM	#16
Sako Leaky Injector Join Date: Apr 2008 Location: Tarzana, CA Age: 34 Posts: 138 Trader Rating: (30) Feedback Score: 30 reviews	I had a JDM S13 with the original SR that came in it from the factory, and I was getting 11 lbs of boost. Most people that do SR swaps don't install the factory boost solenoid because it's mounted on the shock tower, and since they buy a motor and not a clip, they don't get the boost solenoid. Also, as reeskm said, there was a factory restrictor in one of the lines. It is usually found in the line that goes from the boost solenoid to where it's tee'd off. It can be easily located by looking for a white band towards the end of the vacuum line. Removing this line and replacing it with a normal vacuum line gets you 11 lbs. The car will only boost 7 lbs if the wastegate is connected directly (which is not the way it comes from the factory) since the spring is set for 7 lbs.

11-10-2010, 11:10 AM	#17
Leroy_Stickshift Join Date: Sep 2010 Location: Lower mainland Age: 35 Posts: 22 Trader Rating: (0) Feedback Score: 0 reviews	this is how i ran my vaccuum lines. no solenoid's or charcoal canister.

11-10-2010, 11:14 AM	#19
Leroy_Stickshift Join Date: Sep 2010 Location: Lower mainland Age: 35 Posts: 22 Trader Rating: (0) Feedback Score: 0 reviews	and thats where your boost solenoid/ignitor/other shit is located. i believe its the one connected to the green clip? maybe its both?? im sure someone else in here can clarify, pictures always help though