02402RAMAIR

iTrader: (8)

I am building a new combo for a 2004 Z06 Vette. Customer wants a LS2 402.

So far the build is going to be

LS2 402 14cc dish
AFR 225 72cc 650 springs
Fast 90/90
D1SC

compression should be around 9.2
cam is going to be spec ed by Patrick G

Is this a good setup
Should I do it different

Looking to get 700rwhp

No Juice

iTrader: (11)

What fuel?

I'd suggest staying at 9.5 or more but not less

How much boost do you want to run? The D1 will have troubles keeping up with a 402

02402RAMAIR

iTrader: (8)

93 octane
meth injection if need be.

pro charger said that the D1 should be able to go 14 to 16 psi maxed out.

will 9.2 vs 9.5 make that much difference
What will be the difference

Dragframe

iTrader: (14)

again.. its been said a million times... psi is a measure of restriction. Turbos and s/c are rated at a CFM basicly.

So if you have a BIG motor (like yours) and big flowing heads (like yours) you will hit that CFM much sooner (as in less boost and a maxed out blower) than the other guy with the smaller motor who is making a lot more boost with the same unit.

Someone correct me if i'm wrong... but this is the reasoning i see why everyone is always making threads asking why they can't make more boost with their unit (not taking elevation into account, which also makes a big difference is what a blower will put out)

02402RAMAIR

iTrader: (8)

This did not answer any of the questions I had!


my compression ratio options are 9.2 or 9.8

If the best is 9.5 but can not be done with of the shelf parts then witch would be better. 9.2 or 9.8.

there are many builds that have used a 402 and a D1.
goal of 700rwhp is below there numbers.

I know that a F1 would be the best choice.
customer has a P1 on the car now and wants to upgrade it to a D1.
He does not want to spend the extra for the F1.
not my choice.

98transguy

iTrader: (7)

700rwhp can be done with a 346 and a d1sc on a vette.just go to exotic performance plus and check it out.

02402RAMAIR

iTrader: (8)

You guys kill me.

My customer wants a 402!

customer gets what he wants in my book.

I am trying to decide on the compression ratio.
9.2 or 9.8

will 9.8 be to much.
I will be using knock sensors with this build so I think the 9.8 should be safe.
what do you guys think.

EPP

iTrader: (22)

I'd go 9.2/1 which will give you a safty margin, and 700 rwhp is easily within reach provided you have a good return style fuel system. Bob

02402RAMAIR

iTrader: (8)

Thanks Bob.
9.2 it is.

02SSLE

iTrader: (26)

LOL

Gauge

iTrader: (3)

Can't you get the heads with the larger CCs and just mill them to get closer to your 9.5:1 goal?

CHRISPY

Go with 9.2:1 compression

Ditch the D1SC and go with the F1A with those cubes.

Patrick will spec a cam out to your exact specifications. (ie: emissions compliant? Street, Street/strip, strip only, rpm range etc)

You'll make killer power with that combo...

ChevyChad

iTrader: (50)

I doubt you will see 14-16psi with a D1 on a 402. You probably can hit 700rwhp tho... I'd go with 9.2 also, but that will hurt power a bit...

02402RAMAIR

iTrader: (8)

I was able to talk my customer into a F1A. I will be giving Bob a call and ordering the new F1A head unit Monday. I want to keep as much deck on the cylinder heads as I can. I think the lower compression ratio will still do the job. Thanks Bob for all the help.

ChevyChad

iTrader: (50)

Now you're cookin with gas!

mdhmi

iTrader: (1)

If the goal is 700 rwhp then why buy AFR heads, an LS2 402, etc?

You can make 700 rwhp with a forged 346 with average heads and a decent blower cam on pump gas.

TS6

iTrader: (41)

Boy, there is alot of misinformation here. Alot of people talking about **** they haven't tried or don't know anything about (with a couple exceptions of course).

First, a D1 will feed a 402 no problem. I promise anyone who says it won't is either stupid or hasn't tried it. Will an F1 make more? Yes, of course. If 700 RWHP is the goal why go with a bigger blower, more heat, more noise, etc.?

I make 14 psi on a 408 with a D1SC and a 3.85 pulley. That means I can install a 3.4 pulley and make more boost (and more power). I passed 700 RWHP easily on the 3.85 pulley. This was through an A4, 12 bolt, and big MT's. On pump gas of course.

02402RAMAIR

iTrader: (8)

Lets see. This is a 2004 Z06 with 9000 miles on it. He bought it with 6000 miles on it. After having it for 1 month he put LG long tubes, borla stinger, and a P1 on it. 540 rwhp. Now he wants more.

He wants a ls2 402!

I am using afr 225s for the thick deck, plus they are a great head.

The D1 would have been fine for the 700 rwhp goal but looking ahead I can see that he will probably want more so we decided to skip the D1 and go for the F1. After selling the P1, it will be about 800 more than if he upgraded to a D1.


With this said the 700rwhp goal will be an easy target with the ability to step it up to 900 rwhp easy.

02402RAMAIR

iTrader: (8)

I think this setup will keep him happy for a little while.

Thanks for all the help guys.

EPP

iTrader: (22)

Not a problem, thanks. Talk to you tomorrow. Bob