Mirek

I still have the LS1 manifold and will swap it for either an LS6 or the FAST 78mm. I have searched & discussion seems almost exclusive to the 90mm and subsequent gains/tuning issues. I do not want the tuning "challenges" the 90mm presents or to have to use LS1 Edit.
Cost/value is not an issue, Max HP and a perfect fit is.

How is the overall fit with the 78mm unit? Are they shipping with all of the hardware now ?
Can I still use my stock T-body ?
Do I have to tune or can I just plug and play and let the computer learn ?

Also:
I am getting 205 AFR's milled .24 for a 62cc & 11:1
I understand per AFR that you can mill heads .35 -.40 without LS6 manifold fit issues
I hope this is true for the 78mm FAST unit as well.


Thanks for any help that you guys can provide.

Damage Inc.

iTrader: (7)

I think a 78mm LSX would be the way to go. Considering your mild cam and future for AFRs. Don't get an intake to be equal to a 2002 model Fbody, surpass them. I believe a 90mm would be a bit to large for your application.

The fit is fine and the install is straightforward with a few small fabrications. Yes, you can use your stock TB on the 78mm, but not the 90mm. Use the search button and you'll find your info.

LS1LT1

iTrader: (16)

I was wondering the exact same thing except that I'm remaining stock internals.
I was on the fence about going to an LS6 or an LSX 78mm from my LS1 intake but once I found a great deal on a used LS6 I just had to take it.
Still considering an LSX 78mm with my newly ported/polished TB as a nice addition to my bolt ons only car though.

n2o

iTrader: (1)

LS6 with ported tb.

Mirek

Hey thanks that was the kind of input I was looking for. Now to learn about the "fabrication" required. I had heard that the FAST intakes were "not ready for prime time yet" as one member put it, but evidently this is not so much an issue with the 78. I am almost sold on the 78 FAST....I'll do some more searchin'
For as much cash as the FAST units cost they should fit perfectly I am surprised I have to fab.
Ballz.
Thanks again.

jrp

iTrader: (16)

from what i've seen stick w/ the ls6 or go with the 90mm. the 78 gains havent been worth the price.

black_z

iTrader: (4)

I too would go with an LS6, and a ported stock TB.

Mirek

JRP - Note I still have the LS1 so if the 78 Fast gets even a small amount over the LS6 It would be worth it. My main concern is fit, especially with the AFR heads cut down .24

cyphur

iTrader: (10)

Mirek, jrp nailed it. LS6/90mm or bust. i'm stickin to the ls6 til i go bigger cubes. i picked mine up for 300 even. that was over six months ago when the lsx intakes were still real iffy, especially for a simple bolt on motor. ls6 will still give you the gains you want, for a much better price over the 78mm FAST.

davered00ss

iTrader: (4)

With a cam I would get the Fast 78mm. It shows more hp on motors with H/C. I thought the 90mm was only good for larger cubes.

Mirek

I'm cam soon to be heads/cam. I am not going to try to be smarter than some of you cats here though.
If the FAST can give me a few ponies extra (at all) over an ls6 and fit perfect that is good enough reason to get the FAST for me. I do not see anything else in the pipeline and I'm not messing with a 90mm.

Trojan T/A

iTrader: (1)

If your arent looking to buy immediately, you might want to wait a few months and see how the new BBK manifold turns out. It's an 85mm and looks like a nice piece. It should make some good power.

jrp

iTrader: (16)

thats what i thought too until the numbers for the 78mm started comming out, unless you port match the intake to your heads (which most people dont) then the 78mm hasnt shown enough solid gains to warrent it. with the 90mm on a 346 h/c setup i've seen 20rwhp with some great under the curve power.

smokin' joe 00 ss

27HP gain here with the 90mm with my small B1 cam and stage2 heads and made great power through out the curve. If money not the issue go with the 90mm and get it dyno tunned it will run great.

Mirek

No, I do not want to have to get a tune w/ the 90 and worry about it being finicky here and there with my small cam it's not worth it and I'd have to re-tune after the heads go on. I read about the BBK and I have not heard much skuttlebutt about it really. It is aluminum (which some say is a "heatsoak" and others say "yes but some of the fastest cars in the world have aluminum intakes") so I am not sure what to think after reading all the negative stuff about the aluminum Holly. Thanks for the helpful input and opinions guys.

smokin' joe 00 ss

My cam is a 221/221 559/559 114lsa and the 90mm doesn't have any issue's at all it's very drivable in any kind of traffic. If your going to go with heads you'll wish you went with the 90mm down the road. The tunning is just adding fuel if you already had it tunned with your cam your turner should do it just for dyno time since the heads and intake are just adding more air thats what mine did.