9.5:1 setups

[ac4g63]

I inherited the car with 9.5:1 pistons in it already and I don't want to rip apart the block to put in 8.5:1's but I don't know what direction to go as far as gaining more power since I can't run alot of boost.

My setup is basically:
RC550's
HKS Cams
evo 16g
190lp fuel pump
S-AFC
I/C piping
3' exhaust system
FMIC soon

Please post your set ups or advice. Thanks

 

[ac4g63]

Wow, no 9.5 setups.

 

[L2RTSiAWD]

You may no be able to run as hig of boost with the 9:5 but you have more overall motor power so it kind of offsets. depending on the octane of gas you have avaiable you should be able to tune fairly well.

 

[Antilles]

Highest possible octane, lots of fuel, get a hell of a good FMIC, and keep the boost low. Thats really all you can do. Oh, and get a datalogger. With the same fuel setup as you, i can only go to 14-16psi on my 9:1 pistons. I can only imagine what 9.5:1 would be like.

Good luck, dont blow it up.

chris

 

[AWD]

92' octane, 9:1 compression, stock boost. Any problems? Need to rebuild the motor but I'm on a tight budget for a mounth. Will get 720's before my break-in is up so I won't be racing on 440's. Will my motor blow sky high or should I wait for the big injectors.

 

[Awdboost]

If you want to be like all the big dawgs then Go with the 9:1 but your going to be fighting knock alot on the street if you use pump gas. Unless it just a fun car then I would go with that setup. But there are lots of guys running 8:5 and are happy.

 

[Tevenor]

Originally posted by Awdboost
If you want to be like all the big dawgs then Go with the 9:1 but your going to be fighting knock alot on the street if you use pump gas. Unless it just a fun car then I would go with that setup. But there are lots of guys running 8:5 and are happy.

Strange. I am running 9:1's on 93 pump at 20 psi without any issues.

 

[Awdboost]

Originally posted by Tevenor


Strange. I am running 9:1's on 93 pump at 20 psi without any issues.

I don't own 9:1 But the fact are the higher the ratio the more chance of knock. That why turbo car have 8:5 vs. a honda's that push more like 11:1. but that because they don't have turbos.

 

[Antilles]

Yeah, i dont know how you can do that on a sidemount, but it sure as hell aint normal.

 

[hose101772]

say what kind of compression numbers is everyone at.my 9.0 setup grenaded little while back.the engine had been apart before i got it and the head must have been milled tons.the valves were the lowest point on head surface.before headgasket went i check compression it was showing 200lbs on all 4 cyl.running 16thou top ring gaps.seemed abit high.anyway wondering how far off it was.