Vac leak or just pressure drop - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Bad40r7 · 08-04-2007, 07:46 PM

Well guys, im still a noob to the sr20, but am catching on quick. Bare with me a little...I have a redtop, and im assuming its a t25. I have a 3inch front mount core, with the normal legnth pipes. Before, my bov O-ring was ripped, so it was leaking boost like crazy, now that i have a new one, its better, but still not what i expected. If i am rolling in 2nd at say 25mph...and put it to the floor, it will go, pull out of vacumn, to about 2psi...and then very abruptly shoot up and the car will start pulling. Is this because im loosing so much pressure because of the front mount.

And a quick one, i have an HKS actuator...i have been adjusting it, making it longer...and havnt noticed the boost moving past about 6psi.

Thanks guys.
-Alex

Bad40r7 · 08-05-2007, 07:18 PM

Anybody have a clue?

mwilloughby87 · 08-05-2007, 07:29 PM

i wouldnt think that the fmic would make that much of a difference. i have the same mods and at about 3000 im at a steady 7psi and its a gradual pull. not all at once. id go back and check over everything

Bad40r7 · 08-05-2007, 08:59 PM

Thats where my problem comes in, my tach is not accurate lol. So i have no idea when im hitting boost. I think im going to buy some carb cleaner and spray around to see if i have a leak. Thanks.

08-04-2007, 07:46 PM	#1
Bad40r7 Zilvia Junkie Join Date: Jun 2007 Location: Maryland Age: 37 Posts: 348 Trader Rating: (0) Feedback Score: 0 reviews	Vac leak or just pressure drop Well guys, im still a noob to the sr20, but am catching on quick. Bare with me a little...I have a redtop, and im assuming its a t25. I have a 3inch front mount core, with the normal legnth pipes. Before, my bov O-ring was ripped, so it was leaking boost like crazy, now that i have a new one, its better, but still not what i expected. If i am rolling in 2nd at say 25mph...and put it to the floor, it will go, pull out of vacumn, to about 2psi...and then very abruptly shoot up and the car will start pulling. Is this because im loosing so much pressure because of the front mount. And a quick one, i have an HKS actuator...i have been adjusting it, making it longer...and havnt noticed the boost moving past about 6psi. Thanks guys. -Alex

08-05-2007, 07:18 PM	#2
Bad40r7 Zilvia Junkie Join Date: Jun 2007 Location: Maryland Age: 37 Posts: 348 Trader Rating: (0) Feedback Score: 0 reviews	Anybody have a clue?

08-05-2007, 07:29 PM	#3
mwilloughby87 Zilvia Junkie Join Date: Feb 2007 Location: smyrna Age: 37 Posts: 441 Trader Rating: (10) Feedback Score: 10 reviews	i wouldnt think that the fmic would make that much of a difference. i have the same mods and at about 3000 im at a steady 7psi and its a gradual pull. not all at once. id go back and check over everything

08-05-2007, 08:59 PM	#4
Bad40r7 Zilvia Junkie Join Date: Jun 2007 Location: Maryland Age: 37 Posts: 348 Trader Rating: (0) Feedback Score: 0 reviews	Thats where my problem comes in, my tach is not accurate lol. So i have no idea when im hitting boost. I think im going to buy some carb cleaner and spray around to see if i have a leak. Thanks.