max-hid

iTrader: (2)

I have a vortech with 3.12 pulley and im going to build my engine..i want to know what is best do it low compresion(8:5:1) or high compresion pistons(11:1)..im going to put a 50-75 hp shot of nitours to for drag days..which is the best setup of pistos??

Sylvan Lake V35

iTrader: (23)

I hate be the search...guy but really.... I bet even google has a ton of info on high vs low compression as well as what applications each is suited for and the effects of boost/nitrous on each.

Lower compression engines respond better to boost/nitrous. High compression works typically is best for N/A or low boost small shot applications. If I was doing your build I would go with a 9.0:1 compression ratio.

str8dum1

iTrader: (11)

i wouldnt bother building the motor

Sharif@Forged

iTrader: (92)

Definately a low compression motor.

SmallTuner

iTrader: (2)

a 9.0:1 is what u need for your setup

Floridaboy1605

iTrader: (4)

If you plan on staying with the charger u might get away with a 9.5 or even 10:1 Comp Ratio... But if u have the slightest idea of going for more power down the road just get the 9:1 Comp ratio!!!

max-hid

iTrader: (2)

Thanks...im dont want to make more than 400whp.that is my goal...i need to built the motor??

Cass007

iTrader: (34)

IIQuickSilverII

iTrader: (13)

RA has build cars with 430whp and a built engine




edit.
NO

05Z33

iTrader: (11)

I would say skip the nitrous and go with a higher compression motor. If you really want to spray then you need to lower that compression for sure. However I see your goal is 400whp, in that case you don't need to build your motor at all.

Dynosty

iTrader: (27)

For 400whp, spend your money on engine management and a good tune. If you decide to build, I would keep compression up around 10 rather than 8.5 or 9:1 for your setup on 3.12 pulley.