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View Full Version : SR20DE compression ratio

nasx
10-17-2007, 04:58 PM
I'm pretty certain that the S13 SR20DE has 9.5:1 compression.However, I was told that the S14 has 10:1 compression. Would that be correct?
delphis
10-17-2007, 05:29 PM
I know the s13 de has a 9:1
racer98
10-17-2007, 07:00 PM
Its a little bit higher then that, are you planning a turbo set up on a S14 SR20DE , you know its a VTC / VVL motor
nsn240
10-17-2007, 10:51 PM
most of them are 9:1
a couple japanese sr20de's are 10:1 but i forget which ones/why
nasx
10-18-2007, 04:25 AM
I have a 95 jdm s14 with a VTC sr20de which I turbochared. It is now running at 7 psi on a T25. Just need to know what the compression is, so I calculate how much boost I can run on pump.
CKAMC
10-18-2007, 04:58 AM
Yeah non VTC/VVL SR20DE's are 9.5:1

You can find some FWD SR20DE's with 10:1 like some of the UK ones and VVL motors

S14 and S15 SR20DE's are 10:1

Original poster is correct

if you find a S15 SR20DE Autech Motor they have somewhere around the 11.5:1 Compression
nasx
10-18-2007, 01:07 PM
^^ grassyass
racer98
10-18-2007, 01:14 PM
Yeah non VTC/VVL SR20DE's are 9.5:1
if you find a S15 SR20DE Autech Motor they have somewhere around the 11.5:1 Compression


very expensive motor it is now,
racer98
10-18-2007, 01:15 PM
I have a 95 jdm s14 with a VTC sr20de which I turbochared. I is now running at 7 psi on a T25. Just need to know what the compression is so I calculate how much boost I can run on pump

7psi unless you go to a 1.5mm or thicker head gasket

only run an oil cooler if possibile.
ashmir
09-16-2010, 12:16 AM
I have a 95 jdm s14 with a VTC sr20de which I turbochared. It is now running at 7 psi on a T25. Just need to know what the compression is, so I calculate how much boost I can run on pump.

Hi,sorry.I want to know what ecu number for s14 sr20de(vtc).If u can list all out thank in advance..