Newbie help on s14 turbo spool and reading psi - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

IRISH · 06-03-2009, 02:15 AM

Aight so recently i purchased a '96 with s14 engine and it has a Defi boost gauge. My boys were checking it out and realized the turbo wasnt spooling and in fact was reading neg. boost. Its at 7psi boost and only reads when i gun it at like 60mph plus. I heard something its called vacuum and it doesnt boost until you gun it. Can someone please explain his to me. Thanx

HYPNOTIK · 06-03-2009, 02:30 AM

You need more help than we can offer.
Turbocharger - Wikipedia, the free encyclopedia

GSXRJJordan · 06-03-2009, 02:36 AM

Haha... yeah. Your engine is in "vacuum", meaning it sucks more air naturally than the turbo is pushing, until you give it some throttle and wait for the turbo to spool - this is why most boost gauges have '0' somewhere in the middle, so they read vacuum and boost.

Your engine should generate boost in gear (not in neutral/revving with the clutch in) above 3000rpm or so when you give it some gas.

MandTPhotography · 06-03-2009, 02:42 AM

Yep...

Try going slow and matting it in 5th, you'll see your boost rise.

Your turbo isn't always spooling while you drive.

06-03-2009, 02:15 AM	#1
IRISH Join Date: Jun 2009 Location: San Diego/Phoenix Posts: 6 Trader Rating: (0) Feedback Score: 0 reviews	Newbie help on s14 turbo spool and reading psi Aight so recently i purchased a '96 with s14 engine and it has a Defi boost gauge. My boys were checking it out and realized the turbo wasnt spooling and in fact was reading neg. boost. Its at 7psi boost and only reads when i gun it at like 60mph plus. I heard something its called vacuum and it doesnt boost until you gun it. Can someone please explain his to me. Thanx

06-03-2009, 02:30 AM	#2
HYPNOTIK Zilvia Addict Join Date: Apr 2008 Location: Pisa, Italy Posts: 700 Trader Rating: (3) Feedback Score: 3 reviews	You need more help than we can offer. Turbocharger - Wikipedia, the free encyclopedia __________________

06-03-2009, 02:36 AM	#3
GSXRJJordan Post Whore! Join Date: May 2006 Location: San Diego, CA Posts: 9,135 Trader Rating: (19) Rides Gallery: GSXRJJordan Feedback Score: 19 reviews	Haha... yeah. Your engine is in "vacuum", meaning it sucks more air naturally than the turbo is pushing, until you give it some throttle and wait for the turbo to spool - this is why most boost gauges have '0' somewhere in the middle, so they read vacuum and boost. Your engine should generate boost in gear (not in neutral/revving with the clutch in) above 3000rpm or so when you give it some gas. __________________ Jordan Innovations has a new web site! www.JordanInnovations.com -- All your favorite FD Pro Drifters love it, trust me -- www.JordanInnovations.com

06-03-2009, 02:42 AM	#4
MandTPhotography Zilvia Addict Join Date: Jul 2008 Location: Wilmington, NC Posts: 801 Trader Rating: (2) Feedback Score: 2 reviews	Yep... Try going slow and matting it in 5th, you'll see your boost rise. Your turbo isn't always spooling while you drive.