I'm currently modding my my z28 heads, cam, rockers ext. Plus ill be running a turbo with roughly 8-10 lbs ob. I'm guessing the ls6 intake I have will be to small? Just wondering, because I'd love not to have to spend 1000.00 + on a new fast manifold

 

The ls6 will work but a fast would def be worth it in the Ho department you can also get a used one much cheaper than 1k on here

 

With the 346, the LS6 under boost should be all you need

 

The fast is worth 25-30 on a H/C setup on a boosted car it will be the same so it's def worth it if the op has the funds. The early 90's had issues holding boost but I believe they solved that issue. Just make sure the map sensor gets sealed up.

 

Seems like the LS6 will work more than fine IMO. Otherwise if you plan on picking up more boost then you can consider a FAST 92. As mentioned above you can find good deals on FAST intakes here in the parts classifieds.

 

Considering that you have a LS6 already i'd just keep that. Want 20 more hp just add a pound of boost or so

 

No point in buying a fast, just add more boost.

 

I'll give you two answers.

Will the ls6 be fine? Yes absolutely. But let's dig a bit deeper in the bag here...

Folks say yes it's fine, just turn up the boost, and the sort.

All "boost" is, or PSI, is a measurement of restriction, or volumetric efficiency, if we're being technical here. Lets say you run a 10.33 at the track with an LS6 intake and 12lbs of "boost". Replace the LS6 with a FAST 92 or 102 and run the same time (given yes, you will run FASTER now) but this time with only 9lbs. Turn it back up to 12lbs and run faster yet.

It's up to you op. I myself would want to have the least amount of restriction possible in the top end.

 

Well said my brother

On a side note; did you see that FAST 102/102TB/Lid/Rails/Injectors combo for sale on here? I think he's asking $1,200 for the whole setup. I know you were looking there for a while.

 

Very solid point dr_whigham, and it makes total sense of course. For me it would boil down to a hp per dollar thing, and if I already had some sort of power adder i'd be very tempted to pull my 20 hp from that source instead. Now if I were to get a decent price for my LS6, and could find a nice used FAST for a good price well...then for a few hundred bucks I might be very tempted

 

I think some have lost sight of the original question,''will the ls6 intake be too small'',the answer is no it will not.

 

FAST intakes are for Max effort. When every Hp counts. The FAST intake is worst dollar per hp mod you can do.

 

Cool, I'm glad cuz I was afraid that I may be getting well over my head $$$ wise right now, maybe in the future the fast will be something to consider just glad I can get by on the ls6 for now. This will be my first turbo car build/forced induction iv ever done so i've got a lot to learn yet. Glad I've got you guys to get good advice from, any pointers y'all wanna share would greatly appreciated. Thanks

 

with boost you don't need great efficient max flow.you have pressure pushing the air in.

 

No its not, assuming you dont go with a very budget exhaust system or build in general there are worse things. This thread outlines it nicely. https://ls1tech.com/forums/generatio...s6-intake.html
This is very off. Like whigam said by reducing the restriction in the intake side you will lower the boost pressure. By your logic you can just turn up the boost to make the difference up but then you run into problems with detonation or reaching max boost limits.

By doing the fast and lowing the boost pressure you will still make more power than before thanks to the fast and then you can still add more boost and make even more power. bottom line is the fast intake is better period, if you have the extra money it is worth while. You can make the same power with less boost i.e safer and can turn up the boost to the pre fast levels and make more power than before.

The question more specifically was focused to "is the fast worth it" and if the op can afford it then yes it is worth it all day long. The ls6 will work, no one said it wouldn't but is it optimal? No...

 

For an intake that cost $1000, you don't gain much.

Who pays $1500 for an exhaust? Subjective as there is not different brands of FAST intakes

 

---The question more specifically was focused to "is the fast worth it"---oh really?what ever,he got his answer.

 

Think the bottom end will be ok? My car has 130k miles on it but still runs great and don't smoke. Just wondering with that kinda of miles if it can take boost ok? From what I've read it will be ok @ 8 psi but I've also been told its not a good idea with that kinda mileage.

 

Who pays 1k for just an intake? last I checked a new 92 was around 800, couple that with the fact that you can sell your ls6 and tb for around 400 then buy a tb. You can easily put together a complete fast setup for under 1k. Unported of course.

Lots of people pay 1500 for an exhaust. And didnt you notice in my original comment I said assuming you dont have a budget exhaust? How many people on this site do you see with Kooks, ARH, or even Tsp headers? Couple that with a good catted y setup or a set of true duals and you are easily over 1k for just a tad more hp than a ported fast would provide.

Listen obviously you are very rooted in your opinion and thats fine for the op the ls6 will work I nor whigam didnt say it wouldn't, But a fast would be optimal for hp and lower boost levels there's no arguing that. .

1k for a used ported fast setup that gains 25 whp or so isnt that far off from a 1100 dollar exhaust that gains the same over a stock exhaust. my point is on a stock car the fast is a terrible hp/dollar mod but on a built or FI car its pretty close to a lot of other mods because of the breathing capbability of the engine.https://ls1tech.com/forums/generatio...s6-intake.html

OP I think your bottom end will be ok with 8psi as long as it was taken care of. 99% of reliability in FI is in the tune so make sure you get a damn good one

 

Just listen to the guys that said get the fast intake,love mines with it the sky is the limit.