boost leak? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

oLemurs · 12-03-2017, 06:05 PM

So i am having this issue with my sr20 where it only makes around 1 or 2 pounds of boost at around 4000 rpm and i was wondering if its because i have a boost leak. ill link the video im also curious if a boost leak would have the same effect as a vacuum leak meaning it sounds cammed when the engine is warm
https://youtu.be/hLVBrDx3DwU

*e1_griego* · 12-03-2017, 06:23 PM

Your boost gauge is hooked up pre-throttle body so you should change that so you can get a vacuum reading with the throttle plate closed.

Your car isn't going to make boost just free-revving.

unicoder · 12-03-2017, 07:09 PM

You are only running about 10inHg on vaccum, should be more like 20-22. I would definitely say you have a boost leak.

- you arent going to make any boost sitting idle, gotta drive it to do that.
- Is your MAF setup draw through or blowthrough?
- are you familiar with how to do a boost leak test?

oLemurs · 12-03-2017, 08:54 PM

Quote:

Originally Posted by unicoder

You are only running about 10inHg on vaccum, should be more like 20-22. I would definitely say you have a boost leak.

- you arent going to make any boost sitting idle, gotta drive it to do that.
- Is your MAF setup draw through or blowthrough?
- are you familiar with how to do a boost leak test?

im not sure if it is draw thgough or blow through, but here is what the intake looks like. i do not have the supplies to do a boost leak test yet but i should probably buy them
https://imgur.com/gallery/Zg2Y5

oLemurs · 12-03-2017, 09:11 PM

Quote:

Originally Posted by e1_griego

Your boost gauge is hooked up pre-throttle body so you should change that so you can get a vacuum reading with the throttle plate closed.

Your car isn't going to make boost just free-revving.

i hooked it up to where the egr was, also thanks for letting me know it wont make boost out of gear

unicoder · 12-03-2017, 09:50 PM

Quote:

Originally Posted by oLemurs

im not sure if it is draw thgough or blow through, but here is what the intake looks like. i do not have the supplies to do a boost leak test yet but i should probably buy them
https://imgur.com/gallery/Zg2Y5

It's draw through, since your MAF is before the turbo.

Always start with the boost leak test, it will save you hours of headaches

oLemurs · 12-03-2017, 10:37 PM

Quote:

Originally Posted by unicoder

It's draw through, since your MAF is before the turbo.

Always start with the boost leak test, it will save you hours of headaches

got it, just ordered a bunch of stuff for the test

cotbu · 12-05-2017, 05:47 AM

No boost with no load unless you have launch control / antilag

Sent from my LG-H631 using Tapatalk

12-03-2017, 06:05 PM	#1
oLemurs Zilvia Member Join Date: Aug 2017 Location: MO Posts: 197 Trader Rating: (0) Feedback Score: 0 reviews	boost leak? So i am having this issue with my sr20 where it only makes around 1 or 2 pounds of boost at around 4000 rpm and i was wondering if its because i have a boost leak. ill link the video im also curious if a boost leak would have the same effect as a vacuum leak meaning it sounds cammed when the engine is warm https://youtu.be/hLVBrDx3DwU

12-03-2017, 07:09 PM	#3
unicoder Zilvia Member Join Date: Apr 2017 Location: Alabama Posts: 160 Trader Rating: (2) Feedback Score: 2 reviews	You are only running about 10inHg on vaccum, should be more like 20-22. I would definitely say you have a boost leak. - you arent going to make any boost sitting idle, gotta drive it to do that. - Is your MAF setup draw through or blowthrough? - are you familiar with how to do a boost leak test? __________________ 5.3 V8 Swap w/ Nitrous

12-05-2017, 05:47 AM	#8
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 47 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	No boost with no load unless you have launch control / antilag Sent from my LG-H631 using Tapatalk __________________ LoverTechnologies "Half Broken Things!"

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12-03-2017, 06:23 PM	#2
e1_griego Premium Member Join Date: Sep 2004 Location: Independence, Ore. Age: 36 Posts: 2,642 Trader Rating: (24) Feedback Score: 24 reviews	Your boost gauge is hooked up pre-throttle body so you should change that so you can get a vacuum reading with the throttle plate closed. Your car isn't going to make boost just free-revving.