SoCal_T/A

ok so what im curious about is im shooting for somewhere in the 720 rwp range and im wondering if i can get away wit using a ls6 manifold or if i need to step up to like a fast 90/90 set up

TheBlurLS1

iTrader: (8)

You can use an LS6 intake manifold......... as long as you've got about 15psi pushing it's way through it and into a 408....

How about a little more info on your setup?

orangeapeel

iTrader: (18)

Casey, he has to be charged. This is gonna be another one of those "How to make 11'ty billion horsepower DD" threads.


If you are serious about power. Sheet metal intake.

SoCal_T/A

by no means is this one of those threads. i dont plan to dd the car. i was looking into a 383 with an F1a and good set of afr heads with about 15 psi. id be happy with round 500 rwp in my weekend cruiser then just have the 722 rwp when its just not enough

lsx24

iTrader: (45)

Sure you can get away with using the ls6 intake manifold, you will just be leaving horsepower on the table.

ClemsonT/A

iTrader: (2)

Max effort on a full drag car then get a sheet metal intake. Otherwise if you are spending 15k going forced induction get the 90/90 set up. IMO if its a weekend cruise car then 700hp is a lot even for that.

HAMRHEAD

iTrader: (8)

You can look at getting a ported LS2 manifold as well if your going FI. Some people have had issues with the Fast intake and high boost.

SoCal_T/A

what kind of issues? how much would a ported ls2 run me?

BlackSVT03

iTrader: (1)

Never heard feedback on the F-bodys, but couple friends have LS6 FAST intake manifolds on their GTOs and one friend has had fitment issues and his had a little leak because it wouldnt seal properly.

amsterdamn

iTrader: (3)

This FI Firehawk has an Victor Jr intake with aluminum elbow and makes 715rwhp on 93 octane. It works well and is more affordable than a custom made sheet metal intake or Fast 90.

amsterdamn

iTrader: (3)

Then again, this turbo Formula made 995rwhp with a LS6 intake.

SoCal_T/A

ok so as far as skimping on the intake should i step up to a 90/90 or just stay with what i got

amsterdamn

iTrader: (3)

The cost of a Fast 90/90 is not justified in my opinion.

SoCal_T/A

ok so that kinda settles that. what bout the throttle body? can i get away using my stock 78mm or do i gotta go bigger?

BlackSVT03

iTrader: (1)

That second one is Mighty Mouse's car. Didnt he wreck it? That was the one on the magazine cover right?

amsterdamn

iTrader: (3)

Some might disagree, but stock should be sufficient.

Yes, he's working on "MM3" (Turbo WS6). Yes, GM High Tech Performance January 2007 edition.

stevieturbo

With boost, stock intake and TB will work perfectly well, and will pose a negligable resistance to you making yor power goals.

An expensive intake like FAST 90/90 would be like throwing money down the toilet, if making power is your aim.

I switched from a stock ported TB and LS6 intake, to a Victory Jnr and 85mm TB, and to be honest, can see little difference in performance between the 2 setups.

dpw41285

iTrader: (26)

i am doing what i like to call a budget intake...i traded a stock ls6 for a weiand...going to have it port matched to my heads and have the tb opened up to 85mm. Picked up a 85mm tb from professional products for 170 bucks and i guarantee it will outflow a ls6 with p@p tb. and i only spent 70 more considering its around a 100 for the p@p tb. All very nice components. Plus with 15psi or nitrous in my case i wouldnt want a composite manifold...

stevieturbo

It may outflow the the LS6 TB......but can your engine outflow the stock TB in the first place ?

TB Blade and shaft restriction aside.....how big is your intercooler plumbing ? Likely 3"....if so how much restriction is a 75mm TB going to pose when the IC plumbing is 76mm OD ?

Not a huge amount I'd think. An 85mm would pose no restricion at all. It does baffle me as to why some people opt for bigger than that ( on FI applications )