Public Enemy

Guys with over 400 cubes.. what kind of intake you use? Fast 90/90? Sheetmetal? Carb style? Victor JR? Harrop ITB?

the reason im asking is cause i used fast 90/90 intake in my head/cam F-body A4 and ran 11.2 with 433whp on 224/228 Camshaft and AFR 205cc.. the intake was great for that setup

but now our new motor is a 408ci solid roller.. is there a big difference between the fast 90 and the sheetmetal or carb style ones for this kind of engine?

cheers

Public Enemy

anyone?

Stang's Bane

iTrader: (22)

Street car or race car? How much power are you looking to run? I haven't seen many fast 90's on here over 560rwhp or so.

Public Enemy

Street car, N/A engine, producing about 700-750 crank HP.

Stang's Bane

iTrader: (22)

I think the two things you want go together like oil and water. you are going to need ALOT more cubes to make that kind of streetable power n/a. Please someone correct me if I am wrong but I don't think anyone has done that, on a lsx.

Orange Peel

iTrader: (20)

I'm using the FAST 90/NW 90 on my LS2402, should be in the 500rwhp range NA, seems to work ok.

Stang's Bane

iTrader: (22)

On second thought you may be able to with a LS7X world block and head setup 454 with a custom sheet metal intake but this is major bucks. I would say around $15-$20K, but no-one really knows what it is capable of yet. Good luck on getting it to hookup on the street. The higher you go the harder it is to more h.p.

Stang's Bane

iTrader: (22)

That is a good 100-150 away from what he wants isn't it?

Orange Peel

iTrader: (20)

Yeah, but he asked for 400+cid cars, and I have one and I said what I had. If he wants 750crank hp NA he should KNOW the Fast isn't the way to go anyways.

magius231

iTrader: (8)

http://www.harrop.com.au

beast96z (I think) is working on fitting one to his LS1, keep checking back in the forum for status!

SSilverSSurfer

iTrader: (8)

that harrop intake is bad ***....or you do a bad *** sheetmetal intake from beck

Public Enemy

i've seen hydrallic roller, 225cc 402's produce 530-550whp throudh a TH400 and a 12-bolt.. thats almost 700 HP in the crank. thats why I said 408ci and a big solid roller cam revving 8000 RPM with 240cc ET heads would produce 700-750 crank HP is tuned well.

I bet the 8 sec N/A car W2W built was 402ci with C5R heads and big custom solid roller cam revving 9500 RPM. thats more like 700whp.. so i think our setup is good for our goal.

our goals are to hit 9's N/A on a 3300lbs F-body.

11 Bravo

iTrader: (3)

Good luck. The best bet would be to run a set of ported LS7 heads and LS7 intake. That can get you 700 at the crank.

Public Enemy

but has anyone tried the LS7 intake over the FAST? or any other intake manifold over the fast?

im not gonna buy another intake manifold for a 5-10 HP gain.. cause paying 1500 bucks for that kind of gain is not a good bang for the buck.

do u know how much the LS7 intake costs? any before/after dynoes from fast 90 to better intakes?

cheers

strokedls1

iTrader: (1)

You won't see a ls7 intake vs fast 90 because the ls7 intake only works with ls7 heads. It bolts up differently and has rectangular ports on the ls7 intake. Price on those were cheap. Something like 270 the last time I looked. With a solid roller running a lot of rpm I would use the edelbrock victor jr with a port job, and run 12.5 compression or more. The edelbrock does require a lot of fab work to make things work. Stock computer only goes to 8k rpm, so if you want to rev higher than 7.6k I would swap to a aftermarket computer. I believe a high 9 is possible on the motor with the right combo and a good track.

11 Bravo

iTrader: (3)

As said above, the LS7 intake only fits the LS7 heads. You will also need LS7 rockers. It does flow more than the FAST, fwiw. If you do a search you will see where LG made something like 620rwhp with ported heads, cam, headers and tuning on a new Z06. MTI is up there, too. The LS7 is the **** in my book.

Public Enemy

say for a 26x/26x cam with around 680 lift, how do u think the ls7 heads and intake will be much better than a fast with ETP 240cc heads? yeah we are going more than 12.5:1 CR. btw how much is the edelbrock victor jr.?

why do u think another computer is needed if we rev more than 7.6k? the maximum is 8k right? hopefully we are not goin over 8k rpm.

Public Enemy

about the rockers.. the jesel j2k will work well on a solid roller setup.

yeah i saw that thread and was REALLY impressed.. i mean cam upgrade+mild exhaust port work, tuning and headers and that thing gained 180whp! one question though.. was that on Stock 11:1 Compression ratio?

Beast96Z

iTrader: (21)

Your correct. I'm working on it, if they'd get it here. Supposed to be here right now, but you know how things go. Not quite sure the intake runners are tuned for the revs he's looking for. I believe they are adjustable legnths though, so maybe he could shorten them a bit. I'd say they are hands down the best route, but not many americans are ready to throw down $3500+ for a intake that they don't even know fits or not. However, I do plan to make it fit in mine, no matter what. Hence the right up when I'm finished.

pdd

iTrader: (3)