0 Boost on SR20. troubleshooting help - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

JohnnyDrfiter22 · 05-07-2014, 03:36 PM

Last drift event, my car decided to stop boosting during one of my runs. I have installed an AEM V2 with a map sensor so difficult trying to find the culprit.

what are some of the things to look for, I have no visual boost leaks. the WG snaps back when pulled back by force. The turbo is an ISIS 3871 new last year. It is not smoking at all.

indomiekid1 · 05-07-2014, 03:55 PM

no visual as, you check on your gauges?

JohnnyDrfiter22 · 05-07-2014, 05:23 PM

No visual leaks from the couplers or anything that could cause a possible leak.

I check my boost gauge it reads 20 vacuum, than rev it up and its 0 boost. MY BOV doesn't go off at all.

jr_ss · 05-07-2014, 06:14 PM

Pull the exhaust and intake pipes off and look at your wheels. You can further inspect the turbo by removing the compressor and exhaust housings. Time to get dirty.

Better yet, remove the intake pipe and start your car, watch what the compressor wheel does. Does it move? If not what's keeping it from spinning? Sometimes it's better to start with the basics.

DillPickle · 05-07-2014, 06:16 PM

i have a feeling that chinese turbo shit the bed

indomiekid1 · 05-07-2014, 07:05 PM

btw when you rev it and and have no boost, your just sitting in your car and not moving?

i had that before, but once i drove it was fine. weird.

anyway... if i was you, i'd do what jr ss says and get down in their and check.

JohnnyDrfiter22 · 05-07-2014, 08:15 PM

#probablytruth

Quote:

Originally Posted by DillPickle

i have a feeling that chinese turbo shit the bed

jr_ss · 05-07-2014, 08:46 PM

Quote:

Originally Posted by indomiekid1

btw when you rev it and and have no boost, your just sitting in your car and not moving?

i had that before, but once i drove it was fine. weird.

anyway... if i was you, i'd do what jr ss says and get down in their and check.

The reason you don't have any boost at idle or free revving the car is because there is zero load on the motor. You need a load to create boost. You'll see the needle move to 0 on your boost gauge, but not create any positive pressure.

JohnnyDrfiter22 · 05-07-2014, 09:47 PM

I took it for a spin down the street, feels like a KA. 0 boost either with a load and my BOV wasnt going off. I am going to check out the turbo tomorrow.

I pulled the BOV off but not apart yet its a HKS SSQV. im really hoping the bov is stuck but wouldn't the turbo still create boost?

Quote:

Originally Posted by jr_ss

The reason you don't have any boost at idle or free revving the car is because there is zero load on the motor. You need a load to create boost. You'll see the needle move to 0 on your boost gauge, but not create any positive pressure.

indomiekid1 · 05-08-2014, 07:00 AM

jr ss, yep correct!

cool, keep us updated

Kaifd3s · 05-08-2014, 07:46 AM

Check to see if the compressor wheel is spinning. First things first.

shawn1331 · 05-10-2014, 06:01 PM

Quote:

Originally Posted by JohnnyDrfiter22

I took it for a spin down the street, feels like a KA. 0 boost either with a load and my BOV wasnt going off. I am going to check out the turbo tomorrow.

I pulled the BOV off but not apart yet its a HKS SSQV. im really hoping the bov is stuck but wouldn't the turbo still create boost?

it'd make boost but it would just be sent out the open bov immediately essentially causing a boost leak.

Tom N · 05-11-2014, 11:47 PM

With a leaking bov it would still produce positive boost pressure at wot. Just not as much as normal. If you are producing zero boost at wot then the turbine/compressor wheel isn't turning freely.

05-07-2014, 03:36 PM	#1
JohnnyDrfiter22 Zilvia Addict Join Date: Apr 2008 Location: New Jersey Age: 38 Posts: 670 Trader Rating: (0) Feedback Score: 0 reviews	0 Boost on SR20. troubleshooting help Last drift event, my car decided to stop boosting during one of my runs. I have installed an AEM V2 with a map sensor so difficult trying to find the culprit. what are some of the things to look for, I have no visual boost leaks. the WG snaps back when pulled back by force. The turbo is an ISIS 3871 new last year. It is not smoking at all.

05-07-2014, 06:14 PM	#4
jr_ss Post Whore! Join Date: Dec 2005 Location: Pa Posts: 6,056 Trader Rating: (34) Feedback Score: 34 reviews	Pull the exhaust and intake pipes off and look at your wheels. You can further inspect the turbo by removing the compressor and exhaust housings. Time to get dirty. Better yet, remove the intake pipe and start your car, watch what the compressor wheel does. Does it move? If not what's keeping it from spinning? Sometimes it's better to start with the basics. __________________ My SR20VET

05-08-2014, 07:46 AM	#11
Kaifd3s Zilvia Addict Join Date: Feb 2008 Location: Tamarac, Florida Age: 35 Posts: 694 Trader Rating: (16) Feedback Score: 16 reviews	Check to see if the compressor wheel is spinning. First things first. __________________

05-11-2014, 11:47 PM	#13
Tom N Zilvia Addict Join Date: Oct 2012 Location: SW Florida Posts: 746 Trader Rating: (1) Feedback Score: 1 reviews	With a leaking bov it would still produce positive boost pressure at wot. Just not as much as normal. If you are producing zero boost at wot then the turbine/compressor wheel isn't turning freely. __________________ 98 240sx w/ S15 SR20DET, T2 20g, 11.22 @ 124.98

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05-07-2014, 03:55 PM	#2
indomiekid1 Leaky Injector Join Date: May 2014 Location: Austin Age: 37 Posts: 96 Trader Rating: (0) Feedback Score: 0 reviews	no visual as, you check on your gauges?

05-07-2014, 05:23 PM	#3
JohnnyDrfiter22 Zilvia Addict Join Date: Apr 2008 Location: New Jersey Age: 38 Posts: 670 Trader Rating: (0) Feedback Score: 0 reviews	No visual leaks from the couplers or anything that could cause a possible leak. I check my boost gauge it reads 20 vacuum, than rev it up and its 0 boost. MY BOV doesn't go off at all.

05-07-2014, 06:16 PM	#5
DillPickle Zilvia Member Join Date: Nov 2013 Location: las vegas Posts: 155 Trader Rating: (-1) Feedback Score: -1 reviews	i have a feeling that chinese turbo shit the bed

05-07-2014, 07:05 PM	#6
indomiekid1 Leaky Injector Join Date: May 2014 Location: Austin Age: 37 Posts: 96 Trader Rating: (0) Feedback Score: 0 reviews	btw when you rev it and and have no boost, your just sitting in your car and not moving? i had that before, but once i drove it was fine. weird. anyway... if i was you, i'd do what jr ss says and get down in their and check.

05-08-2014, 07:00 AM	#10
indomiekid1 Leaky Injector Join Date: May 2014 Location: Austin Age: 37 Posts: 96 Trader Rating: (0) Feedback Score: 0 reviews	jr ss, yep correct! cool, keep us updated