Ls sn95

Trying to get an idea of the perfect CID for my turbo motor here is a few goals for the car.


Street/ strip car 1100 hp goal
Fuel is goin to be e 85 with an intercooler
4l80e transmission
Will be using an 88mm turbo
Lsx block
Ls7 heads

Now I have heard a few different opinions as 370,390,400,410 CID let me kno what you guys have or reccomend thanks guys

Stroked96Bowtie

iTrader: (22)

Since you're going LSx block, should try to get as many cubes as possible without sacrificing the effienciency of the combo. 427ci seems to be what most go with, thats the ci mine is also.

milkplus

iTrader: (3)

4.125 minimum bore for the ls7 heads, 4.000 stroke max on the lsx block = 427cid.

Ls sn95

Well I'm not set on anything right now I just want to kno the best CID for a turbo

mike13

iTrader: (27)

Good question, LME and a few others are having good results with a large bore short stroke configuration. LME builds a 388" motor I think its a 4.125 bore X 3.622 stroke. I personally would go this route only because when you go 427+ it takes a huge exhaust side of the turbo (turbine wheel & housing) to keep from having big backpressure issues.

I personally don't think a off the shelf 88mm turbo is going to flow enough exhaust for a LS7 head on a 427.

Ls sn95

So the 388 wouldn't have an issue with the 88mm maybe with some tsp heads or AFR reaching the 1100 hp rear wheel

mike13

iTrader: (27)

I'm not sure about the turbo but not a problem for the motor. Mighty Mouse was making 1300rwhp on a 370 W/GT91 turbo T4 housing.