SR20DET No Boost? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Dyl510 · 07-12-2010, 05:33 PM

Don't seem to have any boost..... For one I haven't seen my wastegate move an inch since it's been running/revving up

Moreover, I have a vacuum line connected to my Fuel Pressure Reg. which is supposed to up the fuel pressure under boost... and the fuel pressure does nothing, if anything the fuel pressure drops slightly after revving.

I'd figure so long as the exhaust is spinning the damn turbo you would get some sort of boost when you hit the gas, but I can't even seem to get the thing to spool up!

Any help is appreciated thanks guys.

Sileighty_85 · 07-12-2010, 05:57 PM

Nope you have to put a load on the engine to build boost, free reving wont

s14unimog · 07-13-2010, 09:17 AM

^ well those tiny T25's will make something; at least enough to blow off...

make a charge system pressure tester and see if you have any leaks... Do you have a boost/vacuum gauge?

you should try and provide as much information as possible when asking for help...

Doom · 07-23-2010, 02:27 AM

Yeah, i have the same problem, so free revving wont work. So will the boost work if i go a certain speed? because i tried around the block and it still wont boost. should i try the freeway?

rb25_s13*CHUKI · 07-23-2010, 02:34 AM

do u have a boost gauge hooked up? If so whats your vacum pressure at? Also If the wastegate Isn't hooked up to a vaccum line then your gonna boost ALOT! Lol. So don't try to not run a line to the actuator

Doom · 07-23-2010, 02:54 AM

well actually it is my friends car, there is a boost gauge, and i dont really know what the vacum pressure is at??? and also the BOV barely hisses.

97nismo · 07-23-2010, 05:56 AM

exhaust leak???

lazysk8er2 · 07-23-2010, 10:49 AM

loose intercooler pipe

spools420a · 07-23-2010, 11:55 AM

I'll sell you my home boost leak tester for $20,I gotta make somthing off it =]

volkrps13 · 07-28-2010, 02:40 PM

could be a major exhaust leak at the turbo/mani or a bad boost leak somewhere in the fmic system

Sileighty_85 · 07-28-2010, 03:42 PM

turbo seized?

Pull off the turbo intake and see if the turbine wheel spins freely

TurboStrong · 07-28-2010, 03:56 PM

check to see if ur actuator arm is loose?

that little ring comes off ever so often and the arm comes off

07-12-2010, 05:33 PM	#1
Dyl510 Join Date: Jul 2010 Location: Vancouver Age: 36 Posts: 14 Trader Rating: (0) Feedback Score: 0 reviews	SR20DET No Boost? Don't seem to have any boost..... For one I haven't seen my wastegate move an inch since it's been running/revving up Moreover, I have a vacuum line connected to my Fuel Pressure Reg. which is supposed to up the fuel pressure under boost... and the fuel pressure does nothing, if anything the fuel pressure drops slightly after revving. I'd figure so long as the exhaust is spinning the damn turbo you would get some sort of boost when you hit the gas, but I can't even seem to get the thing to spool up! Any help is appreciated thanks guys.

07-12-2010, 05:57 PM	#2
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	Nope you have to put a load on the engine to build boost, free reving wont __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

07-13-2010, 09:17 AM	#3
s14unimog Nissanaholic! Join Date: Dec 2003 Location: In a place, near a river, over a lake Age: 38 Posts: 2,415 Trader Rating: (22) Rides Gallery: s14unimog Feedback Score: 22 reviews	^ well those tiny T25's will make something; at least enough to blow off... make a charge system pressure tester and see if you have any leaks... Do you have a boost/vacuum gauge? you should try and provide as much information as possible when asking for help... __________________ Fuking ginger bread man stole my wallet... SHIFT*lock_slide to side d3m3rs0n: if i have a baby im naming it Brandons Fault Emerson

07-23-2010, 02:34 AM	#5
rb25_s13*CHUKI Post Whore! Join Date: Mar 2007 Location: Cali Age: 36 Posts: 2,759 Trader Rating: (16) Feedback Score: 16 reviews	do u have a boost gauge hooked up? If so whats your vacum pressure at? Also If the wastegate Isn't hooked up to a vaccum line then your gonna boost ALOT! Lol. So don't try to not run a line to the actuator __________________ Obliterate

07-28-2010, 03:42 PM	#11
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	turbo seized? Pull off the turbo intake and see if the turbine wheel spins freely __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

07-23-2010, 02:27 AM	#4
Doom Join Date: Jul 2010 Location: San Jose Age: 33 Posts: 6 Trader Rating: (0) Feedback Score: 0 reviews	Yeah, i have the same problem, so free revving wont work. So will the boost work if i go a certain speed? because i tried around the block and it still wont boost. should i try the freeway?

07-23-2010, 02:54 AM	#6
Doom Join Date: Jul 2010 Location: San Jose Age: 33 Posts: 6 Trader Rating: (0) Feedback Score: 0 reviews	well actually it is my friends car, there is a boost gauge, and i dont really know what the vacum pressure is at??? and also the BOV barely hisses.

07-23-2010, 05:56 AM	#7
97nismo Nissanaholic! Join Date: Oct 2008 Location: Asheville Posts: 2,133 Trader Rating: (53) Feedback Score: 53 reviews	exhaust leak???

07-23-2010, 11:55 AM	#9
spools420a Zilvia Junkie Join Date: Dec 2009 Location: phoenix az Age: 43 Posts: 460 Trader Rating: (1) Feedback Score: 1 reviews	I'll sell you my home boost leak tester for $20,I gotta make somthing off it =]

07-28-2010, 02:40 PM	#10
volkrps13 BANNED Join Date: Jan 2010 Location: NC Age: 37 Posts: 103 Trader Rating: (0) Feedback Score: 0 reviews	could be a major exhaust leak at the turbo/mani or a bad boost leak somewhere in the fmic system

07-28-2010, 03:56 PM	#12
TurboStrong Nissanaholic! Join Date: Jun 2008 Location: L.A Posts: 1,707 Trader Rating: (21) Feedback Score: 21 reviews	check to see if ur actuator arm is loose? that little ring comes off ever so often and the arm comes off __________________