FAST 90mm TB and Intake Tunning.

[DaleMX]

Look what Santa dropped at my front door today. Now I gotta do some research and figure out how to tweek this bad boy.

http://www.circuitflex.com/FAST_TB.jpg

[Bruce Melton]

I wish you luck. I found the manifold to be fussy in terms of mounting and while I should have tried longer, did not make the power I expected. They really like >displacement.

[SinisterSS]

Are you sure you need that setup? Email me and I'll send you my shipping address for "proper disposal" of gearhead paraphernalia.

:muahaha:

[DaleMX]

I think port matching really helps these intakes out, so that's my weekend project, then it's tune time.

Hey Rick, I'll send you some of my slightly used "gearhead paraphernalia" from the basement if you want, I have all sorts of neat stuff that's been collecting dust for 20 years or so. In fact, I'll even pay Freightliners fare for the 3 trailer loads.

Of course we must define "Gearhead paraphernalia" as "Anything a gearhead collects and cherishes to the point of "disposal denial".

So that includes:

Fish tanks, dog crates, screening, old lawn mowers, odd wheels, green carpet, rack mounts, old ham radios, etc...

[bink]

I think port matching really helps these intakes out, so that's my weekend project, then it's tune time.

Hey Rick, I'll send you some of my slightly used "gearhead paraphernalia" from the basement if you want, I have all sorts of neat stuff that's been collecting dust for 20 years or so. In fact, I'll even pay Freightliners fare for the 3 trailer loads.

Of course we must define "Gearhead paraphernalia" as "Anything a gearhead collects and cherishes to the point of "disposal denial".

So that includes:

Fish tanks, dog crates, screening, old lawn mowers, odd wheels, green carpet, rack mounts, old ham radios, etc...

I don't think green carpet should be included. That's a standard household item. Some of the rest is a stretch....but you can't stretch to green carpet.

Check out gojo's tuning thread for eff. area changes and tuning that pretty piece -> http://efiforum.iqd.co.nz/showthread.php?t=149

[dfe1]

I don't mean to rain on your parade, just don't want you to beat yourself up if you don't see a big improvement with the FAST manifold. Unfortunately, this manifold doesn't seem to do much on stock displacement engines. We got about one or two horsepower over an LS6 manifold on an LS6 with a 220+/- cam, headers and exhaust. A bit of tuning brought that up to about a 12 horsepower increase, but that's an apple to oranges comparison, because we didn't have time to tune with the LS6 manifold. I also have a friend who has used these manifolds on a variety of engines and his best results were on a stout 420-incher. He saw 10-horsepower over an LS6, but it took quite a bit of tuning to get there. Good luck with your project and keep us posted-- maybe you'll find the secret.

[SinisterSS]

I think port matching really helps these intakes out, so that's my weekend project, then it's tune time.

Hey Rick, I'll send you some of my slightly used "gearhead paraphernalia" from the basement if you want, I have all sorts of neat stuff that's been collecting dust for 20 years or so. In fact, I'll even pay Freightliners fare for the 3 trailer loads.

Of course we must define "Gearhead paraphernalia" as "Anything a gearhead collects and cherishes to the point of "disposal denial".

So that includes:

Fish tanks, dog crates, screening, old lawn mowers, odd wheels, green carpet, rack mounts, old ham radios, etc...

Odd wheels and lawn mowers sound interesting. Fish tanks, dog crates - anything critter related you can keep. :cheers:

[caver]

Those manifolds are very tricky to seal properly.
Strange but those manifolds make a bit of power up here halfway to the clouds course thats with cam and headwork. Std tb and manifolds are restrictive as witnessed by the falling manifold pressure over 4k dont have that problem with the Fast.

[DaleMX]

My main reason for the fast was because I cracked my LS6 intake, repaired it, and it broke again. I have planed on a 402 in the future so I decided the fast 90 was the best decision.

There has been some good gains with porting on stock cube engines, but the correct porting is a science. Tony Mamo over on www.LS1Tech.com (http://www.LS1Tech.com) has shown some real promise. I am going to contact him for details before I do the 402. So for now I will just port match to my Stage II heads.

For the sealing, I bought the thicker o-rings that BYUNSPEED sells, and I'll flatten out the bolts in the valley pan. Hopefully the thicker 0-rings will do the trick though.

[jfpilla]

HP....TQ
362 366 3.90 pt4000 228/228
382 380 3.90 pt4000 228/228 + 90 mm Fast/NW TB
407 374 3.90 pt4000 228/288 + TEA stg 2.5 2.055/1.57
competition ported and polish, 11:1CR

7.199 95.79 1.571 1/8 mi times

These are the results from my 346cu,C5. The intake was not port matched until the heads were redone. The results are good but is not all that unusual.
Why are you flattening the VC bolts, didn't the setup come with the flatter bolts?
I believe the warped intakes are out of the system.
Take your time and watch out for the oil pressure sender. Suggest you put a little clear caulk under the MAP sensor.

[Black02SS]

I have seen a lot of people have trouble with the FAST TB's. Almost all either just give up and buy a NW or do some spring trick. It appears to want to hang around 4k rpms...

[Redline Motorsports]

We have installed many of these 90/90's on a variety of motors. The only ones that really responded well where the 400+ ci motors. I have done a couple stock displacement direct port NOS cars in which this intake is great for. I also got away from the FAST TB as the tolerances where a problem. Most likely leading to the tuning issues many have incurred. We use TPIS's TB with great results!

Howard

[jfpilla]

We have installed many of these 90/90's on a variety of motors. The only ones that really responded well where the 400+ ci motors. I have done a couple stock displacement direct port NOS cars in which this intake is great for. I also got away from the FAST TB as the tolerances where a problem. Most likely leading to the tuning issues many have incurred. We use TPIS's TB with great results!

Howard


Howard,
Dale has spent the money. Let's not rain on his parade before he has installed the setup. It worked very well for my car and scores of 346's. That they work on 346's is not even an issue any more. Also, suggest you try a NW TB and compare the workmanship and quality, built in, that make it the best.
Joe

[Redline Motorsports]

Joe,

I did not have intentions to rain on his parade. The posts prior to mine all just expressed there experiences with that setup, I expressed mine.

Seems like the LS6 intake was a tough intake to improve on. As far as TB's; I have also heard good things about the NW TB's. Many of the "earlier" FAST 90's TB's where causing all kinds of problems with idle due to tolerances. I'm sure they are resolved but when I made the switch to the TPIS I never looked back.

Howard

[dfe1]

For what it's worth, I've seen some kickass billet throttle bodies for both F-bodies and Corvettes that are made by a company in Florida. They have a variety of sizes including 90 and 95mm. I don't have any other details, but you can get that from Pete at CNC Cylinder Heads (727/527-8866) in Pinellas Park, FL.

[DaleMX]

Thanks guys, I appreciate all the feedback, both good and bad!
Well I did get the setup installed last week and the TB did give me mucho trouble. It was sticking at all different RPM's. I ended up installing a booster spring to help it return. I will be selling the FAST and Getting a NW. Fwiw the FAST TB is performing OK with the spring and idle is not an issue, but the tunning is so far off that I now have a bad dead spot just off idle and WOT power dies at 4000 and up so I guess it's going really lean, or the tps is not reporting correctly.

I have a wideband to hook up this week end then I'll run some logs and try to figure this thing out. I may wait on the NW TB though.

[bink]

Thanks guys, I appreciate all the feedback, both good and bad!
Well I did get the setup installed last week and the TB did give me mucho trouble. It was sticking at all different RPM's. I ended up installing a booster spring to help it return. I will be selling the FAST and Getting a NW. Fwiw the FAST TB is performing OK with the spring and idle is not an issue, but the tunning is so far off that I now have a bad dead spot just off idle and WOT power dies at 4000 and up so I guess it's going really lean, or the tps is not reporting correctly.

I have a wideband to hook up this week end then I'll run some logs and try to figure this thing out. I may wait on the NW TB though.


You will like the Nick Williams 90 mm TB.
It makes part throttle tuning a pleasure. I suspect that is due to the exacting tolerances it is milled at. :master: