Slow spooling turbo - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

KingKong8247 · 05-23-2008, 01:14 PM

I have asked this before but I think I figured out a better way to explain it now.

Setup is SOHC 8.8:1 compression, GT30 turbo .63, ebay fmic, 50lb injectors, JWT ecu, and other turbo stuff.

Anyway it worked good for the first few weeks I had the turbo on the engine. Spooled very quickly, was hitting 14psi around 3k and held it till redline.

One morning the car felt sluggish. Now it takes all of 2nd gear just to get to 9psi.

Boost controller won't raise boost, disconnecting wastegate vacuum won't raise boost, compression is good, timing is stock, fuel pressure is at stock.

CLIFFS: Used to hit full boost at 3k rpms, now takes all of 2nd gear to hit ~9psi.

05-23-2008, 01:14 PM	#1
KingKong8247 Zilvia Junkie Join Date: Mar 2002 Location: Jersey Age: 40 Posts: 555 Trader Rating: (0) Feedback Score: 0 reviews	Slow spooling turbo I have asked this before but I think I figured out a better way to explain it now. Setup is SOHC 8.8:1 compression, GT30 turbo .63, ebay fmic, 50lb injectors, JWT ecu, and other turbo stuff. Anyway it worked good for the first few weeks I had the turbo on the engine. Spooled very quickly, was hitting 14psi around 3k and held it till redline. One morning the car felt sluggish. Now it takes all of 2nd gear just to get to 9psi. Boost controller won't raise boost, disconnecting wastegate vacuum won't raise boost, compression is good, timing is stock, fuel pressure is at stock. CLIFFS: Used to hit full boost at 3k rpms, now takes all of 2nd gear to hit ~9psi. __________________ 90 240sx Coupe