SR20det: Good Comp, leak and tune - no power - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Corbic · 07-24-2014, 05:07 PM

So for the longest time my SR has run like shit. It drinks fuel, pops and gurgles at idle, won't stay running while cold and has shit throttle response.

It also feels woefully underpowered. My setup is actually a friends old set up. DOC manifold, 550cc and a t60 Turbonetics in place of his 30R. His car also had BC cams and spun 235 17R tires in first, second and 3rd.

I can't break first.

The car has been tuned serval times. Advancing and retarding the timing does nothing. Fueling is spot on.

3k mile plugs

I get massive blow by and some leakage out the oil cap.

Compression tests on two separate Gage's when warm was 155psi. The second gage need to have the engine cranked longer to get there.

Leak down test was 4-6%. We did it 5 times with 3 different methods.

All the symptoms indicate low compression. There is no boost leaks or vacuum leaks. The turbo was brand new and is still in great shape. Oil is clean. Coolant is clean. The car does not appear to burn oil.

WHAT THE FUCK!

07-24-2014, 05:07 PM	#1
Corbic Post Whore! Join Date: Jul 2005 Location: US Age: 41 Posts: 8,226 Trader Rating: (8) Feedback Score: 8 reviews	SR20det: Good Comp, leak and tune - no power So for the longest time my SR has run like shit. It drinks fuel, pops and gurgles at idle, won't stay running while cold and has shit throttle response. It also feels woefully underpowered. My setup is actually a friends old set up. DOC manifold, 550cc and a t60 Turbonetics in place of his 30R. His car also had BC cams and spun 235 17R tires in first, second and 3rd. I can't break first. The car has been tuned serval times. Advancing and retarding the timing does nothing. Fueling is spot on. 3k mile plugs I get massive blow by and some leakage out the oil cap. Compression tests on two separate Gage's when warm was 155psi. The second gage need to have the engine cranked longer to get there. Leak down test was 4-6%. We did it 5 times with 3 different methods. All the symptoms indicate low compression. There is no boost leaks or vacuum leaks. The turbo was brand new and is still in great shape. Oil is clean. Coolant is clean. The car does not appear to burn oil. WHAT THE FUCK!