s13 sr20 gt28rs vacuum problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

1997silvia · 08-12-2009, 05:48 PM

i just got done installing my gt28rs and its all good except for a vacuum problem that has me befuddled , half the time it shows good vacuum and half the time it shows half the vacuum , i can tell this by the guage and by the fact that under low boost i get turbo flutter and then the blow off valve goes off which is an hks super seq , i have checked all vacuum lines and replaced them all, i dont know if i need a dedicated one but i have one going to three, one line going to my boost guage, wastegate,and blow off valve its wierd how its only half the time

any help greatly appreciated thanks

1997silvia · 08-12-2009, 10:25 PM

im thinking that it may have something to do with the adjustment on the wastegate?

turboant · 08-13-2009, 10:51 AM

im having this same problem and its driving me crazy...

1997silvia · 08-13-2009, 12:39 PM

any ideas turboant? i think that since my wastegate is adjustable i need more preload on the rod to the flapper while at idle or even off, i think that maybe the wastegate is staying open a little and only sometimes which is really wierd to me!!! but i dont want to keep getting turbo flutter and hurt my new turbo
any ideas???????????

1997silvia · 08-14-2009, 10:07 AM

ok this doesnt make any sense to me, somtimes driving down the road everything is perfectly fine i mean i boosts fine, and blows off fine, the other half of the time i get turbo flutter and then the blow off valve goes off like a second or two later?????? the wastegate i can barely move with the car off just sitting there so i dont know that it is my problem but i wont rule it out
does anyone have any idea
thanks so much

*fliprayzin240sx* · 08-14-2009, 03:18 PM

Wait whats the issue? Are you just worried about the turbo fluttering? Loosen up your BOV, plain and simple. Personally, I wouldnt T off the wastegate line, add a dedicated vacuum/boost source for it right off the piping.

1997silvia · 08-15-2009, 09:47 AM

smart man lol i put i dedicated line to the wastegate yesterday and its all good now

08-12-2009, 05:48 PM	#1
1997silvia Zilvia Member Join Date: Nov 2007 Location: pennsylvania Age: 37 Posts: 152 Trader Rating: (3) Feedback Score: 3 reviews	s13 sr20 gt28rs vacuum problem i just got done installing my gt28rs and its all good except for a vacuum problem that has me befuddled , half the time it shows good vacuum and half the time it shows half the vacuum , i can tell this by the guage and by the fact that under low boost i get turbo flutter and then the blow off valve goes off which is an hks super seq , i have checked all vacuum lines and replaced them all, i dont know if i need a dedicated one but i have one going to three, one line going to my boost guage, wastegate,and blow off valve its wierd how its only half the time any help greatly appreciated thanks

08-14-2009, 03:18 PM	#6
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Wait whats the issue? Are you just worried about the turbo fluttering? Loosen up your BOV, plain and simple. Personally, I wouldnt T off the wastegate line, add a dedicated vacuum/boost source for it right off the piping. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

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08-12-2009, 10:25 PM	#2
1997silvia Zilvia Member Join Date: Nov 2007 Location: pennsylvania Age: 37 Posts: 152 Trader Rating: (3) Feedback Score: 3 reviews	im thinking that it may have something to do with the adjustment on the wastegate?

08-13-2009, 10:51 AM	#3
turboant Join Date: Nov 2006 Location: sacramento Age: 41 Posts: 15 Trader Rating: (0) Feedback Score: 0 reviews	im having this same problem and its driving me crazy...

08-13-2009, 12:39 PM	#4
1997silvia Zilvia Member Join Date: Nov 2007 Location: pennsylvania Age: 37 Posts: 152 Trader Rating: (3) Feedback Score: 3 reviews	any ideas turboant? i think that since my wastegate is adjustable i need more preload on the rod to the flapper while at idle or even off, i think that maybe the wastegate is staying open a little and only sometimes which is really wierd to me!!! but i dont want to keep getting turbo flutter and hurt my new turbo any ideas???????????

08-14-2009, 10:07 AM	#5
1997silvia Zilvia Member Join Date: Nov 2007 Location: pennsylvania Age: 37 Posts: 152 Trader Rating: (3) Feedback Score: 3 reviews	ok this doesnt make any sense to me, somtimes driving down the road everything is perfectly fine i mean i boosts fine, and blows off fine, the other half of the time i get turbo flutter and then the blow off valve goes off like a second or two later?????? the wastegate i can barely move with the car off just sitting there so i dont know that it is my problem but i wont rule it out does anyone have any idea thanks so much

08-15-2009, 09:47 AM	#7
1997silvia Zilvia Member Join Date: Nov 2007 Location: pennsylvania Age: 37 Posts: 152 Trader Rating: (3) Feedback Score: 3 reviews	smart man lol i put i dedicated line to the wastegate yesterday and its all good now