Overboosting to 20psi!!!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

roel03 · 07-15-2009, 08:36 PM

I just installed my boost gauge yesterday and when doing a pull boost seems to top out at 20PSI. I have a t25 setup with stock wastegate on my ka connected to my intake manifold. Turbo does not smoke but pulls hard, and engine runs awesome. The car is Enthalpy tuned. Sunday I ran it at a full AutoX without a hiccup, but just noticed how high the boost pressure is.

Shouldnt it be only 7psi? How can I get it back down? MBC? I dont really want to use that much money on an EBC as a couple track days are coming up. Any links to a good MBC? This is for reduction, not to increase

zorak · 07-15-2009, 08:40 PM

make your own manual boost controller. there should be a write-up around here.

roel03 · 07-15-2009, 08:42 PM

Will that bring it down to my desired amount?

khilgers · 07-15-2009, 08:49 PM

I would check your wastegate actuator first. On my T28, untuned, no boost controller it never went past 15lbs.

codunc · 07-16-2009, 12:22 AM

You can't lower the boost pressure with a controller, only raise it. check the actuator, and the line going to it. it should just go from the compressor housing anyway, not the intake manifold.

SidewayZ-s14 · 07-16-2009, 12:32 AM

Make sure you have your vacuum lines hooked up correctly. Sounds like you have them hooked up wrong.

roel03 · 07-16-2009, 12:51 AM

Will check it in the morning.

07-15-2009, 08:36 PM	#1
roel03 Zilvia Addict Join Date: Oct 2006 Location: florida Age: 37 Posts: 807 Trader Rating: (23) Feedback Score: 23 reviews	Overboosting to 20psi!!!! I just installed my boost gauge yesterday and when doing a pull boost seems to top out at 20PSI. I have a t25 setup with stock wastegate on my ka connected to my intake manifold. Turbo does not smoke but pulls hard, and engine runs awesome. The car is Enthalpy tuned. Sunday I ran it at a full AutoX without a hiccup, but just noticed how high the boost pressure is. Shouldnt it be only 7psi? How can I get it back down? MBC? I dont really want to use that much money on an EBC as a couple track days are coming up. Any links to a good MBC? This is for reduction, not to increase

07-15-2009, 08:40 PM	#2
zorak Zilvia Member Join Date: Oct 2008 Location: South Age: 35 Posts: 287 Trader Rating: (4) Rides Gallery: zorak Feedback Score: 4 reviews	make your own manual boost controller. there should be a write-up around here.

07-15-2009, 08:42 PM	#3
roel03 Zilvia Addict Join Date: Oct 2006 Location: florida Age: 37 Posts: 807 Trader Rating: (23) Feedback Score: 23 reviews	Will that bring it down to my desired amount?

07-15-2009, 08:49 PM	#4
khilgers Zilvia Addict Join Date: Oct 2005 Location: Twin Cities Age: 44 Posts: 893 Trader Rating: (0) Rides Gallery: khilgers Feedback Score: 0 reviews	I would check your wastegate actuator first. On my T28, untuned, no boost controller it never went past 15lbs.

07-16-2009, 12:22 AM	#5
codunc Zilvia Junkie Join Date: Sep 2006 Location: Denver, CO Age: 35 Posts: 316 Trader Rating: (2) Feedback Score: 2 reviews	You can't lower the boost pressure with a controller, only raise it. check the actuator, and the line going to it. it should just go from the compressor housing anyway, not the intake manifold.

07-16-2009, 12:32 AM	#6
SidewayZ-s14 BANNED Join Date: Nov 2007 Location: SoCal 714 Posts: 1,061 Trader Rating: (14) Feedback Score: 14 reviews	Make sure you have your vacuum lines hooked up correctly. Sounds like you have them hooked up wrong.

07-16-2009, 12:51 AM	#7
roel03 Zilvia Addict Join Date: Oct 2006 Location: florida Age: 37 Posts: 807 Trader Rating: (23) Feedback Score: 23 reviews	Will check it in the morning.