URLOSN

iTrader: (29)

I have been reading and am not sure i am understanding some things. I have always dealt with nitrous, so please forgive my ignorance. I bought a D-1sc kit and am fixing to build a motor. i was wanting to do a 402 , but am told it won't make power cause the motor breaths to much air and won't see enough boost, then i thought about a 383, my goals are 750-800 rwhp. Is it true that if your motor is built and is effiecient flowing you won't see the boost, but see the power?? The 402, with say AFR 225's probably won't see maybe 10# of boost, not sure, but will put down the power, and use a lower grade octane fuel to do it, or am i wrong in my assumption. Does more boost mean more RPM's the blower is spinning or does that even matter. i have been doing a lot of reading, but boost is all greek to me, sorry for the ignorance, but trying to learn and choose my set up accordingly, and i also plan on using a small 75 shot or maybe a max 100 shot to cool the boost more.
thanks for any help.
David

URLOSN

iTrader: (29)

any help would be appreciated

SSilverSSurfer

iTrader: (8)

370 with a D1 or a 408 with a F1 would be bad ***...hell a 347 might be able to get you where you want

ty_ty13

iTrader: (42)

i've said this many times... PSI has nothing to do with power.

psi only shows the motors restriction.
the amount of air flow going in and out of the motor is what you want.

a 408 and a d1 might get 800rwhp it just depends how much compression and what gas you use.

i'm hoping for 700rwhp in my 408 and d1 with a FMIC and 93 octane

URLOSN

iTrader: (29)

Thanks man, thats what i was wondering, you don't have to have a lot of boost to make the power. so if you have a good motor that flows air it won't push a lot of boost. i am looking at around 8.5 or 9:1 compression.

Thanks SS, i also thought about that option of a 370 also, just wanted a little bigger

EPP

iTrader: (22)

I would shoot for a compression ratio of 9.5/1 for your engine. Centrifical superchargers don't require as low of a compression ratio as a turbo or a top mount supercharger requires. With your larger engine with a lower boost combo, you will make more power with a little higher compression ratio. Bob

URLOSN

iTrader: (29)

Bob will i be able to make say around 700 on pump gas, or will it have to be race gas all the time?? theoretically speaking of course

EPP

iTrader: (22)

You can easily see 700 rwhp on pump gas with an ATI ProCharger D-1SC. Bob

URLOSN

iTrader: (29)

would i see that on a 402 or would i need to stay with a 383 or under? whatever motor i choose, afr 225's , fast 90, 1 3/4 to 1 7/8 headers, bolt on's, blower cam, etc, thats what i am looking at, just not sure on motor size

Blownramair

I just put a w2w ls6 blower motor in (346) with a d1sc @ 16psi... Depends on how much power you want to make? I run turbo blue, to be safe, instead of pump gas... The smell is just.... ahhhhhhmazing...

Bob will know a lil more then me on this, but should be able to hit 700at the tires with a 346 and, of course, the right parts... I'll tell you one thing, for the price of my w2w ls6 engine it was the best bang for my buck...

Jay

matt346ls1

We put together a 427 with a d1sc and made 700rwhp @ 8-9lbs of boost in a street vette. The power is almost unusable. Fun on the highway though.

Matt

ty_ty13

iTrader: (42)

dont use a fast intake use a ls6 intake instead... or use a single plane (which is the best option for more even airflow) GMPP or edlebroch

nc z28

andy at a&a corvette has done several cars w/ 402's and d1sc that have 800= rwhp.

SSilverSSurfer

iTrader: (8)

no problem buddy...i myself will probably be running a 347 with a D1....hope to make some good power with that

URLOSN

iTrader: (29)

was this just the blower, or did it have N2O on it also. i would love to hit that high, but i am just trying to figure out the best route to go. so a 402 is not out of the question then,

Ya'll say do not use the fast 90?? So lets say, a 402, blower cam, 9 or 9.5:1 compression, an edelbrock carb style intake, and pulley it for around 12-14# of boost would be a pretty good set up, or should i pulley it for more?

ty_ty13

iTrader: (42)

14# on a 402 with nice heads will be a lot of power-- atleast 700rwhp usually

Drewstein

Since my numbers were on stock heads and bottom end and 91 octane, I would say 750rwhp on pump is an easy goal using a built 346. I don't like the 400+ CI motors because they're more prone to belt issues caused by massive low end torque.