started porting my FAST intake
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,650
Likes: 4
From: Ringgold GA
You know the saying; can't believe everything you read
That being said, most of the articles I read concerning the FAST 78, stated that there was not a lot of gains over the Z06 intake. Haven't seen any #s to substantiate the negative feedback, but that's pretty much all I've seen written
It would have been great on a project like this, to see a couple of dyno pulls with the stock intake, 78, and ported 78. Since pulls are so expensive, most just dyno after several mods, so it's hard to tell what changed the #s.
That being said, most of the articles I read concerning the FAST 78, stated that there was not a lot of gains over the Z06 intake. Haven't seen any #s to substantiate the negative feedback, but that's pretty much all I've seen writtenIt would have been great on a project like this, to see a couple of dyno pulls with the stock intake, 78, and ported 78. Since pulls are so expensive, most just dyno after several mods, so it's hard to tell what changed the #s.
I have not done any mods since my last dyno session at Vengeance so I might head back down there to make a few pulls after the intake is on. We'll see.
I copied and pasted this response I made in another thread discussing various gains from different intakes and their cost effectiveness. This particular customer was looking at buying an 85 mm TB and planned on opening up the 78 to fit which leaves it very thin. Seems some of what I posted below applies to your question....especially the quick chart of power gains versus cost.
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Consider this in your search for "value" (I look at everything on a HP per dollar basis).
If you already have a good epoxied and ported 78 mm TB (like a Mark Shaner piece or something similar) score a FAST 78 unit cheap and just consider having it ported. Even at the prices I charge to do a very neat and thorough job your return on investment is still better than buying a larger 85 mm TB and cutting up the snout which might close the gap in half between an unported 78mm and the 90mm FAST (netting you 2-3 more HP than a 78 FAST). For an extra few hundred you would see an additional gain of 10 RWHP and a similar bump in TQ (my ported FAST 78 set-up went 20 RWHP and 15 RWTQ stronger than my former LS6/78 set-up as I previously mentioned).
For grins I just whipped up this spreadsheet....prices and performance may vary slightly but I think the general point I am making would still be intact.
Manifold.............Avg Retail $$...........Typical Gain.........Cost/HP
Stk FAST 78.............700...................... ..8....... ............. $87
Stk FAST 90 (w/ TB)..1200......................13....... .......... ...$92
FAST 78 w/ 85 mm.....900.......................11..... .......... .....$82
Ported FAST 78.........1200......................18. .......... .........$67
Ported FAST 90/90.....1700......................23..... .......... .....$74
The key is to understand that the snout doesn't represent the largest restriction in the FAST hence the smaller gains when messing with it. Reshaping and reconfiguring the ports are where the larger gains in airflow and power can be unlocked....
Tony
--------------------------------------------------------------------
Consider this in your search for "value" (I look at everything on a HP per dollar basis).
If you already have a good epoxied and ported 78 mm TB (like a Mark Shaner piece or something similar) score a FAST 78 unit cheap and just consider having it ported. Even at the prices I charge to do a very neat and thorough job your return on investment is still better than buying a larger 85 mm TB and cutting up the snout which might close the gap in half between an unported 78mm and the 90mm FAST (netting you 2-3 more HP than a 78 FAST). For an extra few hundred you would see an additional gain of 10 RWHP and a similar bump in TQ (my ported FAST 78 set-up went 20 RWHP and 15 RWTQ stronger than my former LS6/78 set-up as I previously mentioned).
For grins I just whipped up this spreadsheet....prices and performance may vary slightly but I think the general point I am making would still be intact.
Manifold.............Avg Retail $$...........Typical Gain.........Cost/HP
Stk FAST 78.............700...................... ..8....... ............. $87
Stk FAST 90 (w/ TB)..1200......................13....... .......... ...$92
FAST 78 w/ 85 mm.....900.......................11..... .......... .....$82
Ported FAST 78.........1200......................18. .......... .........$67
Ported FAST 90/90.....1700......................23..... .......... .....$74
The key is to understand that the snout doesn't represent the largest restriction in the FAST hence the smaller gains when messing with it. Reshaping and reconfiguring the ports are where the larger gains in airflow and power can be unlocked....
Tony
Last edited by VIPERBLUELX; Nov 7, 2008 at 03:31 PM.
Pro
Joined: Aug 2007
Posts: 619
Likes: 1
From: ATLANTA GA
I did my 90 just like you did yours... I sent it over to vengeance for a street tune to get the LS2 more operable.. Well you know how that goes lol.. But I definally picked up gains on the butt dyno. No numbers yet, to all the skeptics I swapped from a LS6 manifold any camed stock head car or head and cam car benifits because the demand for air is much needed. Obviously the weak stock cam doesnt really need a whole lot of demand.
Do you ever come out here in atlanta for anything.. Id love to check out the car and hear those ti's. A friend of mine has a 01z just like yours but hes all stuck up on those corsas.
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,650
Likes: 4
From: Ringgold GA
When I come to Atlanta I usually have the family with me. My modded Ti's sound pretty dang good, but they are pretty tame after I put the highflow cats back on it. Sort of a sleeper sound, but they come alive at WOT.
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Pro
Joined: Aug 2007
Posts: 619
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From: ATLANTA GA
the video you posed of the Ti's was it without cats then?
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,650
Likes: 4
From: Ringgold GA
Here's how the intake lined up to the heads with no port matching.
Finished last night and bolted it on. I'm running the car at the track Saturday.
It was pretty close, I used a pick to scribe the bottom of the intake and matched it the best I could.
Finished last night and bolted it on. I'm running the car at the track Saturday.
It was pretty close, I used a pick to scribe the bottom of the intake and matched it the best I could.
Melting Slicks
Joined: Jul 2005
Posts: 2,586
Likes: 2
From: Bardstown Kentucky
I usually take a micrometer and get a top and bottom measurement, then sketch that measurement over to the intake and port to that. I guess it all works the same, just thought I would put that out there.
The intake is looking great! I cant wait to see the results!
The intake is looking great! I cant wait to see the results!
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,650
Likes: 4
From: Ringgold GA
that would probably work, but with the lower torqued to spec ever runner didn't require the same amount of material removal, if I'd done them all the same, the entrance of the head would have stuck out some.
Melting Slicks
Joined: Jul 2005
Posts: 2,586
Likes: 2
From: Bardstown Kentucky
I use the micrometer on every port, with mine it was a ls1 so I didnt have as many options. My heads are ported as well so I knew I would have to mic. every hole. I would assume when you torque it down if its done in the right fashion the intake would go straight down, as long as both holes are the same they should line right up.
Melting Slicks
Joined: Jan 2008
Posts: 2,394
Likes: 0
From: Goldsboro NC
Did you do anything with all of the plastic thats all over the gasket...looks like a crappy job from FAST in the mold process
Since I gotta remove my intake for the clutch install Im gonna pull mine apart and check a few things....if they require a little massaging then I will do it...and while Im at it Im going to do the LPE map sensor relocation kit
Since I gotta remove my intake for the clutch install Im gonna pull mine apart and check a few things....if they require a little massaging then I will do it...and while Im at it Im going to do the LPE map sensor relocation kit