Boost spike, actuator problem? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

BLITZZZ · 02-18-2007, 01:22 PM

Hey, to make a long story short:

1) I welded a hks ssqv bov flange on my hotpipe, for some odd reason the flange was warped, and with the bov on it would leak.

2) The turbo made a sharp whistle noise, i removed the flange, welded a steel sheet over the hole to cover it up temporarily.

3) the turbo still makes a whistling noise ( it didnt beforehand) and the boost spikes to 10.0 ~ 10.8 lbs (STOCK SR20DET REDTOP)

4) I disconnected my greddy profec, and it still spikes to 10lbs. (The car used to be a consistent 7lbs)

The temperature here is and has been about 15-25 degrees Fahrenheit. Other than the boost spike and whistle the car runs fine.

Could the weather be to blame for

a) dramatic 3.8lb increase in boost
b) sharp whistling noise

or could something be wrong with my actuator? (my turbo is fine, atleast the blades/seals are)

-Sorry to make such a big deal about this, just wanted to be thorough.

*NemeGuero* · 02-18-2007, 01:27 PM

check vac line to actuator.

BLITZZZ · 02-18-2007, 01:37 PM

I did, it was cracked a little from being stretched over the nipple, so i replaced it with a bigger diameter new line, still same ole problem..

punxva · 02-18-2007, 02:59 PM

i maybe the sound your hearing is compressor surge since the bov wasnt seating properly, and now that you've just completly covered the hole on the hotpipe, it is just surging the compressor. If you want we could meet up somewhere and i could check it out for you man. PM me for my cell number

BLITZZZ · 02-18-2007, 03:03 PM

im not in the state right now thanks, anyways, i know what compressor surge is. this is when I'm in boost it whistles, and the real problem is just that turbo / wastgate is spiking

***S14DB*** · 02-18-2007, 03:26 PM

Check the vacuum actuator and it's linkages.

punxva · 02-18-2007, 03:29 PM

hmm sounds like maybe a boost leak somewere too, check your piping, and by whistles do you mean it sounds like its just spooling very loudly?

BLITZZZ · 02-20-2007, 12:09 PM

just checked all piping for leaks, retightened everything, still does it, the car runs perfect its just boosting to 10lbs as opposed to 7 and whistling like a bitch, i'm going to replace the actuator this weekend, hopefully that will fix it..

question.. if a bolt on the Intake manifold was removed for sometimes and my car goes through hot and cold cycles could the flange have warped? or would there have to be like 2 or 3 bolts missing? (all other nuts/bolts were tight to spec)

thanks

***S14DB*** · 02-20-2007, 12:58 PM

More like the welder sucked and warped the flange.

BLITZZZ · 02-20-2007, 08:28 PM

your butt.... on my....... butt..

uhhhh heh heh heh

BLITZZZ · 02-22-2007, 01:01 PM

solution:

driving today and pop, intercooler pipe blows off, t-bolt clamp broke in two, im guessing it was already pretty much done for and wasnt sealing a coupler correctly.. went to Napa got a ring clamp and fixed the whistle, and the boost dropped down to 8.9-9.5 PSI, fuckin weird

Ameer · 02-22-2007, 11:15 PM

are you running a stock actuator?

punxva · 02-22-2007, 11:31 PM

wooohooo i knew it had to do with a coupler, lol congrats man

02-18-2007, 01:22 PM	#1
BLITZZZ BANNED Join Date: Jan 2007 Location: Richmond, VA Posts: 134 Trader Rating: (0) Feedback Score: 0 reviews	Boost spike, actuator problem? Hey, to make a long story short: 1) I welded a hks ssqv bov flange on my hotpipe, for some odd reason the flange was warped, and with the bov on it would leak. 2) The turbo made a sharp whistle noise, i removed the flange, welded a steel sheet over the hole to cover it up temporarily. 3) the turbo still makes a whistling noise ( it didnt beforehand) and the boost spikes to 10.0 ~ 10.8 lbs (STOCK SR20DET REDTOP) 4) I disconnected my greddy profec, and it still spikes to 10lbs. (The car used to be a consistent 7lbs) The temperature here is and has been about 15-25 degrees Fahrenheit. Other than the boost spike and whistle the car runs fine. Could the weather be to blame for a) dramatic 3.8lb increase in boost b) sharp whistling noise or could something be wrong with my actuator? (my turbo is fine, atleast the blades/seals are) -Sorry to make such a big deal about this, just wanted to be thorough.

02-18-2007, 01:27 PM	#2
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 40 Posts: 8,132 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	check vac line to actuator. __________________

02-18-2007, 03:26 PM	#6
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	Check the vacuum actuator and it's linkages. __________________ Comments should be taken as Opinions not as Statements of Fact

02-20-2007, 12:58 PM	#9
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	More like the welder sucked and warped the flange. __________________ Comments should be taken as Opinions not as Statements of Fact

02-18-2007, 01:37 PM	#3
BLITZZZ BANNED Join Date: Jan 2007 Location: Richmond, VA Posts: 134 Trader Rating: (0) Feedback Score: 0 reviews	I did, it was cracked a little from being stretched over the nipple, so i replaced it with a bigger diameter new line, still same ole problem..

02-18-2007, 03:03 PM	#5
BLITZZZ BANNED Join Date: Jan 2007 Location: Richmond, VA Posts: 134 Trader Rating: (0) Feedback Score: 0 reviews	im not in the state right now thanks, anyways, i know what compressor surge is. this is when I'm in boost it whistles, and the real problem is just that turbo / wastgate is spiking

02-20-2007, 12:09 PM	#8
BLITZZZ BANNED Join Date: Jan 2007 Location: Richmond, VA Posts: 134 Trader Rating: (0) Feedback Score: 0 reviews	just checked all piping for leaks, retightened everything, still does it, the car runs perfect its just boosting to 10lbs as opposed to 7 and whistling like a bitch, i'm going to replace the actuator this weekend, hopefully that will fix it.. question.. if a bolt on the Intake manifold was removed for sometimes and my car goes through hot and cold cycles could the flange have warped? or would there have to be like 2 or 3 bolts missing? (all other nuts/bolts were tight to spec) thanks

02-20-2007, 08:28 PM	#10
BLITZZZ BANNED Join Date: Jan 2007 Location: Richmond, VA Posts: 134 Trader Rating: (0) Feedback Score: 0 reviews	your butt.... on my....... butt.. uhhhh heh heh heh

02-22-2007, 01:01 PM	#11
BLITZZZ BANNED Join Date: Jan 2007 Location: Richmond, VA Posts: 134 Trader Rating: (0) Feedback Score: 0 reviews	solution: driving today and pop, intercooler pipe blows off, t-bolt clamp broke in two, im guessing it was already pretty much done for and wasnt sealing a coupler correctly.. went to Napa got a ring clamp and fixed the whistle, and the boost dropped down to 8.9-9.5 PSI, fuckin weird

02-22-2007, 11:15 PM	#12
Ameer Zilvia Member Join Date: Jan 2007 Location: Los Angeles,CA Age: 35 Posts: 181 Trader Rating: (0) Feedback Score: 0 reviews	are you running a stock actuator?