I need some guidance. I'm looking to upgrade my intake. I have an option to go with the FAST 90 intake and FAST 90 TB for ~850 or go with a brand NIB FAST 92mm Intake for 800 (no tb). I'm working on a budget so build is coming very slow and I'm trying to find the best deal. My WS6 has full exhaust, Volant CAI, upgraded 25% pulley, 160 thermostat, custom programmer, 4.10 gears. Can you help a brother out? Thanks.

 

All depends on your budget....


If you go fast 92 you have to hunt Down a TB which can run 200+

So about 1k for the 92 setup

$850 for the 90 sounds like a good budget setup.

It's just up to you if you want to hunt those extra ponies!!

 

I appreciate the response. How much hp/tq would I be losing if I go w/ the 90mm intake? I know FAST doesn't make them anymore but is it really that big of a difference between 90mm and 92mm?

 

The deal on the 90 setup sounds pretty good. You get the intake and TB for the price you could get the 92 intake for. Like Burken01 said, a TB is going to run you around $200. Plus, you can always get the 90 setup ported. I don't think the little, if any, gain in HP will be worth the extra money spent.

 

Sounds good. I appreciate the guidance on this. But does anyone know the hp/tq difference between the two?

 

Don't let the TB factor your decision a lot. The Fast 90mm TB is crap and will most likely need replaced anyway. I have one and it's been nothing but a nightmare both as far as hanging blade and it refuses to maintain a proper idle. Several tuners on here have said the IAC chamber needs ported on them to make them run right consistently.

I would either try to get a lower price on the 90/90 (then you can try it as is and sell the TB if it is junk) or else just get the 92 and a good TB and be done with it.

There will be 0 hp difference. The 92 was a revision to correct some issues such as the MAP sensor fitting loose and a couple other small things. The size of the TB has very little to do with power gains, it is runner shape and plenum volume that make the fast superior, not the opening size (hence why a 102mm intake with a 90mm tb is still an improvement, new runner design)

 

This might be true, but Fast did fix the issues they had with the original 90's, or atleast the replacements I received were always fixed. The first couple Fast 90's I used hung open all the time and didnt idle very well. They warrantied both on different occasions. They acknowledged there was an issue and immediately sent me new "fixed" ones. I never had single issue from the replacements. It's doubtful in my opinion that your 90 would still have an issue buts its possible.

 

Negligible at best. 90/92 to a 102 is a different story.

FWIW, I got my 92/NW92 combo for 800 shipped. I personally think the 92 price is high if it's used.

I'd opt for the 90/90 combo, and have it ported by one of our sponsors if money allows.

 

Interesting. I have had this one for many years as I got it for a good deal (or so I thought) second hand. The person who had it before me even tried drilling a hole in the blade to get it to work before they apparently gave up and I bought it not knowing better.

I spent some time with it to get it to stop hanging (oddly enough it only hung open once installed, it would not do it on the bench).

I assumed the idle was due to poor tuning. It still did it after a dyno tune and then I bought software and have been learning since. I have spent many hours trying to get it to work and it will not idle correct consistently. My next step is to try porting the IAC as recommended by other tuners and if it still doesn't work I will buy a replacement.

I would want to see one working properly or test it myself before ever spending money on another, that's for sure.

 

Its been so long and of course they dont make them anymore, so there's probably no way to get an answer any longer. I bought my first one used off tech. I didnt know there was any issues with them at the time. It hung horribly. I would be at stop lights at 2500 rpm. I also had an idling issue when it wasnt hanging. I tried the drill mod as well but it didnt help much. I called them and even though I bought it used, they replaced it no questions asked. I put the new one on and never looked back. I didnt have a single issue.

I had the same issue with another car but again, sent it back and the new one never had a single issue.

 

Dang wish I would have known they would do that back when I first got it. Thanks for posting though!

 

Wow, Thanks for the input fellas. I guess it comes down to if I want to gamble on a possble FAST 90/90 w/ issues, buy NIB FAST 92, or just wait to see who has one to sell for a decent deal.

 

Wow, I just found a FAST 102 NEW for $820. Wonder if I should just go w/ this or would it be overkill? I will eventually do CAM & Heads.....

 

Just remember when going to a FAST 102 you'll need new fuel rails and injectors.

 

I am contemplating the same.....

 

I don't mind doing that, I'm just wondering if it's overkill...

 

not overkill, again the performance is dictated by the runner design...there for a while Fast didn't even sell the 92mm anymore, they built the 102mm to replace it but people wanted the ease of install the 92 had so they brought it back

 

So then what so much more difficult to build w/ the 102 vs the 90 or 92? Is it just the fuel rails and injectors?

 

This. Which = spending even more money over the already expensive intake and TB

 

An outside-the-box opinion:

You might be better off just going with a LS6 intake (if you're 98-00) and investing that extra in a cam rather than going right to an expensive manifold setup that isn't really "needed" yet.