Intake NVCS (valiable valve timing control) is the reason. S14/S15 SR20DE has it and any FWD SR20 does not have it (except SR20VE's VVL system). NVCS is the old school valiable valve timing system and B14's GA16DE motor came with it. Another reason is the compression ratio. JDM S14/S15 came with higher compression (10.0:1) than US spec SR20 (9.5:1). Those two are the reason why S14/S15 Silvia SR20DE has 20 extra HP.
Oh, BTW, S15 SR20DE motor is 165HP.
See the bump where I pointed? This is where the NVCS sits. This is the S15 Silvia Autech version's 200HP SR20DE engine. I know.....
Last edited by CarbonBlack200 : Jul 31st, 2002 at 11:34 PM.
Thx for the answer carbon... u rock! Can you tell me where to find the specs on that 200 hp sr20 you pictured and/or some info on how to tune my sr20 to those specs... something in english (stuff i found is mostly in japanese).
I had no luck finding it in English either. But since I can read Japanese, I'm going to translate for you.
These are the differences.
Higher Compression:
This 200HP SR20DE comes with high compression pistons. They raise the CR up to stock 10.0:1 to 11.7:1.
Exhaust System:
Nissan developed the exhaust headers with Fujitsubo. They are equal length stainless steel 4 to 1 headers. It comes with larger catback exhaust system too. Main pipe is same as SR20DET equipped Spec R, and it has Autech version original muffler.
Cams & tuned NVCS:
Those cams are higher lift and larger overlap. They special tuned the NVCS to match those cams so still has good low and mid end torque.
ECU:
Autech version ECU has different fuel map, and different ignition timing program. Rev limitter is also raised from 7200 -> 7500rpm.
Sodium filled valves:
Higher reving engine generates more heat. These sodium filled valves will reduce the heat increase inside the head. Those help to burn the fuel better.
Nismo Lightweight flywheel & heavy duty clutch:
For quicker rev, Autech changed to billet lightweigt flywheel. Heavy duty clutch is probablly the same one used for Spec R (turbo). Also, this Silvia Autech comes with 6-speed manual transmission.
I drove couple S15 Silvias when I was in Japan and one of that was non turbo SR20DE (165hp). I wasn't very impressed with the performance though.. I would love to take that Autech version for a spin.
Originally posted by sr20racer WOW Carbonblack, you sure know alot about the SR20. So what do you have?
What do I have? Oh come on! I really hate that question. GA16po$. Probablly 40hp at the wheel.
Doing years of SR20 research probablly built up my useless knowledge about SR20. This is what happens when I really want something.
Originally posted by devious_kid is it possible to get an nvcs on a fwd sr20de or will it only work with rwd?
It is probablly not possible. RWD SR20DE head probablly won't fit on FWD block. look at the picture and see where the distributer is. I don't think that's going to work at all. But it would be nice to have a couple more extra HP with NVCS on FWD motor. I don't know why, but Nissan choose not to use it.
LIUSPEED, your question will be answered in Forced Induction forum.
now..... it would be interesting to take a se-r and MAKE it rear wheel... take alot of modifications... but I would like to see it done...
__________________ CHAD HODGES PARIS HARLEY-DAVIDSON www.parisharley.com GAURANTEED LOWEST PRICES ON HARLEY, HONDA, & YAMAHA BIKES, ATV'S, SCOOTERS, AND SIDE BY SIDES
1994 NEW PROJECT (SHHHHHH)
1964 Dodge Polara -5" Drop Past Nissans: 1999 Se-L -Sold; 1991 Hardbody -Sold; 1995 Se-R -Gave Away; 1994 Sentra Le -Sold; 1995 Nissan Hardbody -Sold; 1997 Nissan Hardbody -totalled 1/08
SR20DE Hidden Power?
(drooling)?
NVCS
Linear Mode
