ca18det head gasket sizes

[Chinamandrift]

i know the thicker the less compression .......the less comrpession means the more boost safely............

would lower compression cause it to have a slower response?

theres many different sizes ...i cant figure out which one to go with .....

what company makes the best head gaskets?

[c-rad]

You don't buy a thicker headgasket to lower the compression. You buy it to compensate for a machine head/block. Remember, the ecu is calibrated to work with 8.5:1 compression. That's why when you run a different compression ratio, a standalone is the only way to go.

[Chinamandrift]

thanx for the info c-rad.....i am going stand alone .....i plan to use the autronic EMS..........

[bentvalves]

siiick wish i woulda went with a true standalone rather than PFC.

[ca18datsun510]

You don't buy a thicker headgasket to lower the compression. You buy it to compensate for a machine head/block. Remember, the ecu is calibrated to work with 8.5:1 compression. That's why when you run a different compression ratio, a standalone is the only way to go.

where do you get this stuff.

yes that would be optimal, but not written in stone.

[ca18datsun510]

i know the thicker the less compression .......the less comrpession means the more boost safely............

would lower compression cause it to have a slower response?

theres many different sizes ...i cant figure out which one to go with .....

what company makes the best head gaskets?

your question is kinda vague. technically lower compression will have lower response, but it depends how lower you go. the less volume the cylinders are pushing out the slower the turbo will spool up in theory. but you could run higher boost with less chance for detonation.

but there's more to it then that.

i would just go with a stock thickness gasket.

[pnblight]

ok in a nut shell you basically on the right track, lowing compression will reduce responce and people DO use thicker head gaskets to do this regularly but mainly for high boost application (drags / dyno queen). I would not recomend it for street application tho.

pete

[ca18datsun510]

a lot of the dedicated "serious" drag cars run high compression turbo setups, with real good tuning.

just like in n/a, a higher compression will produce more power in a forced induction application. its just more likely to blow up.

[float_6969]

Don't use a thicker HG unless you're compensating for removed material from the block/head. It ruins the quench area and decreases combustion chamber efficiency. If you want to lower the compression, get different pistons.

Also, I'm running 9.5:1 compression on pump gas. It's a pain. I'm only running about 8° total timing under boost. But man does the car scream with the timing up around 20° total timing under boost with race gas!

I'm planning on h20 injection to help reduce intake temp to allow for more timing.

[ca18datsun510]

I'm planning on h20 injection to help reduce intake temp to allow for more timing.

ive been looking into that myself. what kits are you looking at?

[float_6969]

Aquamist is very nice, top of the line, but also very expensive. http://www.aquamist.co.uk/

After much research though, I think the best bang for the buck is Cooling Mist. Like aquamist, they have a h20 injection pump designed specifically for this purpose. It's not the same pump as aquamist's(aquamist's pump is MUCH smaller) but it works much better than the pump that comes with most kits. Also, they have a digital controller with various available injection curves to suit most applications. It is 2D in it's most basic form, but with some free software and some tuning, it can be converted to a 3D map and you can completely customize the injection amount based on various imput. VERY nice and nothing else out there like it. All of their stuff is very competitivly priced as well. http://www.coolingmist.com/

[Chinamandrift]

very very good info guys .............but .........timing and gas is another issue .......over here in the US ...the highest octane from pump gas is 91 octane ........there is 100 and 110...and i think 120 also but thats all condsidered race gas ....only sold on the track ....or theres some 100 octane pumps in very very rare locations.......but then again my car is not going to be rolling around on the street....ca18det did not come out in the US .....stupid US regulations ...haHA

Float... what is the highest octane from the pump that your using? which pistons and gasket did you use to get 9.5:1 comp ?

i heard about the H2o injection how does that work ???........theres a company that will make custom carbon fiber intake manifolds ........its suppose to dramatically lower intake temp ........ive seen the ones they make for hondas...big blocks .....they are very high quality......

as for the gaskets ........i would love response more then power .......has anyone else experienced a different compression ratio other then stock ?

[float_6969]

Float... what is the highest octane from the pump that your using? which pistons and gasket did you use to get 9.5:1 comp ?

i heard about the H2o injection how does that work ???........theres a company that will make custom carbon fiber intake manifolds ........its suppose to dramatically lower intake temp ........ive seen the ones they make for hondas...big blocks .....they are very high quality......

as for the gaskets ........i would love response more then power .......has anyone else experienced a different compression ratio other then stock ?

I get my gas from BP. It's 92 octane. It's prob actually 91, but it helps me sleep at night thinking I've got that extra 1 octane rating. I got custom pistons made by CP for the 9.5:1 compression. Stock HG, it's holding up just fine. Seen as much as 14 psi on a T28.

H2O injections sprays a fine mist of water into the intake tract. This cools the air going into the motor. Also, since the water is intert in the combustion process it has no ill side effects. It also helps to steam clean the combustion chambers, removing and preventing carbon buildup, which reduces knock. H2O injection by itself does nothing. The extra timing that you are able to run because of the reduced intake temps is where the power is made. A Carbon Fiber intake mani would be cool, but depending on price, I doubt it would be worth it unless they've got flow comparisions vs. stock and the runners all flow evenly.

AFAIK, I'm the only retard that's INCREASED his compression. The off bost response of my motor is very nice. It has decent low end torque for a CA anyway, and the spool up time is considerabally faster than before. Once again, this is all at the sacrifice of severly retarded timing under boost. If I were to do it again, I'd only bump it up to 9:1....