409CISecondGen

iTrader: (2)

So I'm thinking about the FAST102 intake. I'm doing the intake before headers because I am concerned that with my Corsa Sport exhaust the car is going to **** of my neighbors when I get headers (I leave at 6:30-7am every day). Also, from the dyno sheets it looks to me like the 102 should make about 20hp/30tq. So close to the gains I would see from headers, but with a much cheaper install that I could DIY and much happier neighbors. I have a few questions about the FAST:

1. Can I run this Billet fuel rail (FAST 146033-KIT) and Crossover (54028FRC) without issues on my Stock LS2 Injectors?

2. Will the billet fuel rails do anything or do they just look pretty?

3. Any reason I should consider getting headers first?

4. Is it worth it to port match the 102 to my stock 243 heads?

dodson55

iTrader: (18)

i would do the headers first headers are probably the single best mod that you can do to a lsx engine and it will let you take full advantage of any other mods you do in the future

409CISecondGen

iTrader: (2)

Fast 102 cost:$850
Install: DIY
Retune: $50
Gain: 20whp, 30wtq
roughly $45 per HP

Headers with Cats: $1300
Install: $275-$325
Retune: $50
Gain: 25whp
roughly 65$ per HP

The FAST102 seems like better $ per HP. That's one of the reasons I'm thinking about doing it first. Even adding 200$ for Billet rails, it comes to $55 per HP, plus it looks nicer under the hood and it won't annoy the neighborhood. Unless you compare catless (which I don't think I'll be doing) to billet rails + FAST, it seems like a no brainer to me. I know it goes against convention that's one of the reasons why I'm asking if my math is right.

jrob56

iTrader: (39)

You sure youre gonna see 20/30 out of that intake though full exhaust? Where is all that extra air gonna go? Seems like you need both to get the full potential of the intake. I dont see why you cant do a header install yourself either? If your adept enough to do the intake you can do the headers, just takes longer.

03EBZ06

The 102 lined up pretty well w/my TFS235s. I put an LS3 rail on mine. I think the billet is a waste of money when compared to those.

409CISecondGen

iTrader: (2)

Your right, all the gains I've seen with the 102 have been with cars that already had headers. However, I've seen ported ls2 intakes pick up about the same with or without headers. Also, I've done headers once, never again. I don't have air tools, or patience, or a lift. I've also done an intake manifold on a 350Z and it was the easiest thing I've ever done to pick up 15hp.

The question isn't should I do headers, it's "should I spend less money and do a FAST 102 that will get me similar gains first?" I will get headers but when I do they are going to be stainless with cats and coated. When I do the 102 I'll be sure to do a before and after dyno so that we can quantify the gains on stock manifolds for future reference.


I'm going to do the Billet rails for show anyways, I just wanted to know if there would be an added bonus of lowering the injector duty cycle by any meaningful amount.

jrob56

iTrader: (39)

Yeah the intake will be simple in comparison, I was just saying if you can turn a wrench to do one, you can do the other. It is frustrating though, so if you got the dough I see why you wouldnt want to do it.

Itll be interesting to see the gains, so you are going to port it?

409CISecondGen

iTrader: (2)

Probably, I use Lethal Performance and they do have a ported version for around $130 more. if it's only worth 2hp than forget it but if its worth more I will. I need to do more research on that.

jrob56

iTrader: (39)

Probably not much difference right now If I had to guess, but that port work will shine later with some headers and a cam.

409CISecondGen

iTrader: (2)

I'm not gonna cam it, just going to do full bolt ons and hopefully be in or close to the 11's. Then I'll move onto suspension, this thing drives like a speedboat lol.

SweetS10V8

iTrader: (4)

I have actually done this. I had an LQ9 that was fairly stock. Gained 21rwhp and power accross the board.

1. Had 799 heads(243 equivalent)
2. Had OEM truck cam smaller than LS2 (190s @ .050 and .460/.470 lift)
3. Had OEM exhaust manifolds with an aftermarket exhuast/muffler
4. OEM LS2 90mm DBW throttle body, used on FAST as well
5. Had LS2 intake manifold

So basically an iron LS2 with a little smaller camshaft. I dynoed my truck and immediatly swapped the intake with the truck still on the rollers, NO tuning so there was probably more power on the table.

jrob56

iTrader: (39)

Skepticism withdrawn, do the fast haha. Should pick up more with longtubes later. Might look at upgrading to a fast 90 on my bolt on ls1.

redtan

iTrader: (5)

You are not going to gain that much hp/tq with a FAST102 on the stock heads/cam/tb and through manifolds. So in the end, the headers will give you more power than the FAST.

I've also seen a FAST102 gain 6rwhp on a cammed car with headers and 243 heads...so I'll continue with my skepticism until the OP does get the FAST and shows us some results on the stock cam/heads/tb/manifolds.

409CISecondGen

iTrader: (2)

As long as the fast nets you 15HP and TQ your still at the same HP:$ ratio as longtubes that gain 25HP. Plus it doesn't add nearly as much noise.

There are many graphs showing solid gains from a FAST on an LS2 so your claim of only getting 6hp from a fast is the exception, not the rule.

bww3588

iTrader: (49)

Pay attention....read 2 posts above yours.

he gained 21hp and 20ftlbs thru stock manifolds and smaller cam...WITHOUT A TUNE. no reason the OP shouldnt see the same.

SweetS10V8

iTrader: (4)

Why does it have to he the OP? I just showed you exactly that? Stock cam/heads/TB/Manifolds.......and my cam was even smallerAgreed! Its nothing more than bad data.What you dont see is that those are average files. I did three runs with the stock manifold and they layed over each other, I then averaged them to get the graph.

Then swapped manifolds and did three more runs, and averaged them. So these are "actual" gains, not some "glory pull" that you cant back up.

bww3588

iTrader: (49)

lies! it was a fluke...you had the leaf blower stuffed down her throat...NO WAY IN HELL!!!

409CISecondGen

iTrader: (2)

82cetuner

iTrader: (9)

actually if you have a ls2 intake you will pick up a ton swapping out that shitty intake, you would actualy gain about 6 tp 7 rwhp if you put a ls6 intake in place of the ls2, ls2 intakes suck. however if you had a ls6 intake or ls3 intake you would only see about a 7-10 rwhp gain

409CISecondGen

iTrader: (2)

Correct me if I'm wrong, but don't you need the ls1 style fuel rails and injectors to run the LS6 intake?

Seems like if you have an LS2 you may as well buy a FAST because the injectors and rails on top of the LS6 manifold would probably be close to the same price.

I would also think that the Ls1 injectors would hit full duty cycle pretty fast on an LS2.