high compression setup, any inputs?

[DawgMode]

wassup guys,i have a s14 sr with a gt30 setup and im looking to put pistons in my car, but the thing is i want to do a crazy high compression setup. im looking at around 10.5- 11:1 compression pistons with stock bore. any inputs on what piston manufacturer i should inquire on and if this is a sane idea

[supreamS14]

wassup guys,i have a s14 sr with a gt30 setup and im looking to put pistons in my car, but the thing is i want to do a crazy high compression setup. im looking at around 10.5- 11:1 compression pistons with stock bore. any inputs on what piston manufacturer i should inquire on and if this is a sane idea

You will want to get a really good tune from a pro who is confidante in tuning high compression and/or boost applications. I would talk to some one who will tune it and get input on your set up. I like the high compression motor sound! 11:1 is not insane but Im not sure about a gt30 and 11:1 compression on pump gas.

[E7-S14]

I like the high compression motor sound! gas.

im sorry for thead jackbut could you explain teh high compressoin motor "sound"ive never heard anyone say that..

i have a N/A SR comp 10:1which is considered High. compared to the turbo SR.

and arnt KAs 10:1 also?

sorry for thread jack

[Hijacker]

I don't know if any aftermarket companies make forged straight up that are that high of comp. Wiseco does custom cuts I believe based on whatever comp you want. One of my friends had high comp pistons custom made for his 1st gen Mazda MX-6 and he went with Wiseco.

Also, N/A SRs get the slightly higher compression from headgasket thickness as well as different piston designs.

[supreamS14]

but could you explain teh high compressoin motor "sound"

If you go to the drag strip and listen to some drag cars that run high compression you can hear a crackeling sound. Alot of muscle car's with V8's that have that crackel sound run race gas.

My father had a chevy small block in his camaro that was fully rollerized with roller ball bearings and everything you could do. I think it ran 14:1 compression ratio and could REV 14000RPM!!! 740WHP I will ask him about it tomarrow.

KA24de=9.5:1KA24E=11:1

[DawgMode]

well we run AV gas down here so fuel wont be an issue

[codyace]

well we run AV gas down here so fuel wont be an issue

So you're loosing power then?

I thikn a nice 'higher copmresion' setup would be a 9 to 1 piston, with a smaller HG.

However, if you're looking for something even cooler, go with the same compression piston, but a slight overbore. Little bit quicker spool from both upgrades.

[DawgMode]

um how are u saying we are losing power on AV gas... and with the pistons i really think 10:1 and a thin headgasketwe have no shops down here to bore out so over size is out of the question

[redtop91]

You can always get custom pistons but they aren't cheap. CP makes pistons to order. That being said if you go with something like 11:1 get used to race fuel or low boost. I'd say it'd be pretty dumb to do it on a street car but for a strictly race car it'd be fine.

[DawgMode]

yes im expecting not to be able to run much boost aswell as always being on gas..the car will be a weekend runner only

[srdub-t]

why do you want such high comp.. just do 9:1 with more boost and youll make alot of power safely.. i dont see the point in high comp with low boost.. waste of mony in my opinion

[jr_ss]

why do you want such high comp.. just do 9:1 with more boost and youll make alot of power safely.. i dont see the point in high comp with low boost.. waste of mony in my opinion

Because it's more reliable and you have better off boost response... Not to mention the potential to make crazy amounts of power when the boost is jacked up.. Honda guys do it all the time and it's not uncommon to see 500-600whp with a 10:1 motor at 15-20lbs of boost...

My build is going to be either 9.14:1 or 9.47:1, depending on what head gasket I decide to run. I need to clay my motor though when it gets assembled so I can see if there is going to be able contacting the pistons.

[480sx]

You have a gt30, a turbo capable of putting down 400-450 hp at 25ish plus pounds of boost depending on the trim. Why on earth would you limit that awesome turbo to low boost..

I mean it would be cool to run 10.5:1 ish range with E85 and meth injection. You could put down stupid HP at reasonable levels of boost and still be safe. You would need a hell of a tune.

If your plan is to run pump gas with this setup you have a really bad plan. Honestly, if you cant get E85 then this plan is bust unless its for nothing but a track car that you intend to run race gas with.

Cant stress this enough, your tune has to be perfect or your going to be blowing motors left and right. Make sure you talk to the tuners around your area to see if they can handle what you want them to do.

[FAST-DATSUN]

JE built them for us, but we used 87mm bore. TQ goes up very nice. You need a good Tomie or Apexi head gasket and a really good colling system...

[Seishuku]

Nice reliable water+alcohol injection setup will cure any issues, and you'll get a nice amount of timing back (more torque, yay!).Something along the lines of a progressive controller with fail safes will do nicely.