SR20DET issues - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Blackzenki82 · 11-17-2009, 05:06 PM

so yeah, trying to finish this car off, and I'm having a few issues...

idles OK, a sputter here and there....

under acceleration, it's smooth till about 1500RPM then starts breaking up, popping, and just losing power, i've already put two different MAF's on the car, did a boost/vac leak test, so system is sealed...

i checked time, with a light, and was close enough for gov'mnt work, if not spot on...

i also checked TPS signal, was at .57V and put it at the .45 as used by Nissan...

engine grounds were loose, so i tightened, and even added one on the driver side... and that helped with the idle, as well as setting the TPS...

tomorrow I'm going to pull the valve cover off, and check cam timing, and restab the CAS....

to me, it feels like a boost/vac leak, but like i said, i put an aircompressor on the turbo inlet, and found all leaks (at the couplers), and even went ang got a GReddy hot pipe and HKS SSQV with super low miles for it (as the TurboXS RFL that was on it was leaking like a bitch, and still, no joy..

SO, with that being said, there's a few more things i'm going to check-

Cam/CAS timing
MAF signal (as it MAY be the problem)
spark plug gaps
compression test (although 0mile motor built by a professional)

one more thing, with a blown T25 cause it to run like that? i noticed the T25 on it has a fair amount of shaft play, but not as bad as i've seen on some cars, and does spin freely....

usually i handle my own shit, but here i'm getting kinda stumped, especially if my cam timing ISN'T off....

11-17-2009, 05:06 PM	#1
Blackzenki82 Zilvia FREAK! Join Date: Oct 2008 Location: United Republic of BFE Age: 42 Posts: 1,203 Trader Rating: (12) Feedback Score: 12 reviews	SR20DET issues so yeah, trying to finish this car off, and I'm having a few issues... idles OK, a sputter here and there.... under acceleration, it's smooth till about 1500RPM then starts breaking up, popping, and just losing power, i've already put two different MAF's on the car, did a boost/vac leak test, so system is sealed... i checked time, with a light, and was close enough for gov'mnt work, if not spot on... i also checked TPS signal, was at .57V and put it at the .45 as used by Nissan... engine grounds were loose, so i tightened, and even added one on the driver side... and that helped with the idle, as well as setting the TPS... tomorrow I'm going to pull the valve cover off, and check cam timing, and restab the CAS.... to me, it feels like a boost/vac leak, but like i said, i put an aircompressor on the turbo inlet, and found all leaks (at the couplers), and even went ang got a GReddy hot pipe and HKS SSQV with super low miles for it (as the TurboXS RFL that was on it was leaking like a bitch, and still, no joy.. SO, with that being said, there's a few more things i'm going to check- Cam/CAS timing MAF signal (as it MAY be the problem) spark plug gaps compression test (although 0mile motor built by a professional) one more thing, with a blown T25 cause it to run like that? i noticed the T25 on it has a fair amount of shaft play, but not as bad as i've seen on some cars, and does spin freely.... usually i handle my own shit, but here i'm getting kinda stumped, especially if my cam timing ISN'T off....