I'd keep the ls6. Look around at all the fast ls stuff with stock style intakes. MightyMouse was running a ls6 into the 8.60's iirc. Spend the money elsewhere imo

 

stock long blocks have went low 11's.... doesnt mean they couldn't improve with better parts.

 

Came in here to post about a horse that had been beat to death, re-incarnated then beat to death once again...then I saw the "turbo."

Can offer that the best place to ask is in the forced induction section. However, the FAST really shines when used on engines w/ larger than stock cubes. For this reason, because you are using a turbo, the FAST is probably the better choice; more air movement than a stock LS1.

This may also be an area where a gently ported (cleaned up) LS2 intake can benefit the set up for a lot less money. Have seen gently ported LS2's perform similar & @ times better to an LS6 intake on stock cubes when non-ported LS2 intakes (mold ridges/edges in the runners restrict airflow) generally do not. With a turbo, a cleaned up LS2 intake can be a great choice.

 

Ok. What I meant was, the ls6 intake is not a limiting factor with boost. If you want max effort thats fine, but the fast intake is still the wrong choice for a max effort boosted app.

Spend that 1k elsewhere in suspension or fuel system.

Op, post this exact same question in the forced induction section and see what those folks have to say, because I can easily tell that the majority of the people in this thread are not around boosted stuff.

 

https://ls1tech.com/forums/forced-in...induction.html

10 pages on this with no real answer to that question. I'd probably stick with the LS6.

I've also read threads on the corvette forums where FI guys switched to FAST intakes and gained nothing on the dyno.

 

I definitely want a fast 92 eventually, its on my to get list anyway. Maybe if I'm good mr.c will bring me one for xmas lol. Doubtful. Anyway I have a pair of warhawk heads 235cc 72cc cchambers. Do anyone use or know someone who does? If so do they likem?

 

Maybe ill work some over time and waste the money on a fast just to prove they don't add 30 hp on a h/c car.

 

It's already been done...several times. So, no need. IDK why the FAST/LS6 debate comes up so often. There is a library of info on the subject in the archives.

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Related to my reply a few posts up (not this one), after thinking about it can't see how one intake would be an advantage over the other when related to FORCED induction.

 

A 'waste' of money is relative. I gained 20 rwhp with my 92 on the same dyno from ~4400rpms on up. Below that was about the same...within 3-5 rwhp.

 

Who the hell only drives their car up to 4.4k,

 

ALL that matters is power below 4500, no one races above there and the 20whp or more if ported above there evidently is considered a waste of money.

 

Well, I would have no reason to post bs numbers. I would want my car to gain 30 with a ported fast but I wouldnt bet on it.

 

you have a pretty stout h/c car and make 414. theres no reason with a fast combo PORTED that you couldnt make 440-445 which would be a 25030 hp gain plenty of people do it and have posted results just search in the dyno section.

 

I see the posts on here. I was just saying I have never seen that kind of a gain in person. Maybe in a couple months ill get one if I get bored with the car.

 

Well idk what the difference in dyno numbers would be,but I can say that every time I go to the track seems like most the ls1 are using the fast, na or fi. My only concern was since I don't have the funds for the fast atm could I get by on the ls6 for the time being. I got my answer indeed lol. But the fast must be worth some hp cuz alot of folks usem.

 

Oh yes, they are worth some horsepower, they are just very expensive because Comp has a proprietary product.

 

a aluminum bbk/weiand type intake mite be a better intake for boosted engines.you can find them used for $300.

 

I'll definitely own one asa I get the extra $$$, ill check ebay or the classifieds on here. just can't wait to get this thing done, as I've stated before this will be the first fi car I've ever had so looking forward to see wha t awsome hp really feels like under my foot lol. Guess everyone's been there before

 

+1. Yea they work but not worth it when figuring $$/HP

 

Another `option` that can be looked at is the TPIS mod to your existing LS6 manafold.The 78mm opening is the limiting factor in this manafold not the runners when used on a stock ci LS1.If you decide that your going to up your ci in the future then spend the extra money on the fast,other wise,this could be a viable option for you.