Red_racer2

iTrader: (1)

Can someone help me and figure out if I should go with the Fast Intake with 78mm or the 90mm. Whats the best bang for the buck. I have a stock intake that has been ported and polished so I really dont want to buy another TB. Is the Fast 90 that much better than the 78mm?

Thanks

2c5s

iTrader: (11)

In short, yes.

Ksett

Need more info. What are your current mods and what are the goals for the car? Do you already have an LS6 intake?

Red_racer2

iTrader: (1)

Here is the plan for the car, I am getting AZPS-02 cam, 1 7/8" LT with cats and have spintech exhaust system on the car now. My thoughts were to put the Fast 90 on but since I already had a stock TB ported and polished I figured i really didnt think it was necessary to spend 350 on a new TB. I will be changing my CAI to a better one that I have currently. I road race the car not drag it. I hope this helps out. I just want to know what I am missing by not going to the 90mm if I go to the 78mm. I really not need a lot more HP but wouldnt mind more.

Cop Car

iTrader: (14)

dont bother with a FAST intake, unless you like wasting money or you are spraying

RoastEmSS

LOL fast 78=waste, fast 90=i dont think so

erikthegoalie

iTrader: (29)

its a waste i have heard unless you are going bigger cubes, spray, or a nice set of heads and a cam...then it will shine!

stock motor...nah LS6 all the way!

Cop Car

iTrader: (14)

yes, waste, you can spend the $1200 you would spend on an intake and TB much better somewhere else ie heads

vettenuts

iTrader: (4)

According to all the research I have done, you should get about 15hp with the 78mm. I have been researching the same thing and am in the same boat, I have a ported throttle body and don't want to start over with a new one.

Hotrod God

I currently have the 90/90 set up. I like it. It would be hard for me to judge the gains from just the new TB and intake because I installed a new cam, heads, roller rockers, underdrive pully, and a few other odds and ends all at the same time. From what I have heard, if you already have the LS6 intake, the LSX intake and the 90mm TB are not worth the $$ for the gains you get. The reason I went with them at the time is because I plan on adding a Procharger D1SC next spring. What I gathered from all the research I did was you notice the biggest gains w/ the LSX and 90mm TB when you are using a power adder like NO2 or a supercharger. Otherwise you should just stick with the LS6 intake and the stock ported TB.

staringback05

iTrader: (8)

depends on really what your doing and what you want for your money....a ls6 is the most valuable when it comes to money/performance

Tony Mamo @ AFR

iTrader: (13)

https://ls1tech.com/forums/showthrea...=527602&page=1

Note my replies on the both the first and second page...

Tony M.

gollum

iTrader: (1)

Some say that the MAP sensor fits poorly/loosely on the FAST intake. What is the best way to install the MAP to the FAST intake? Are there any other poor fitment issues with the FAST?

Tony Mamo @ AFR

iTrader: (13)

A new GM MAP gasket is recommended, plus I also recommend purchase of the FAST intake O-rings that go around the eight exits of the manifold. Re-using stock crushed gaskets is not a good idea and can create small vacuum leaks potentially. The FAST O-Rings are slightly thicker than stock and do a much better job of sealing up the ports....

Besides that its a fairly straightfoward install....

Tony

erikthegoalie

iTrader: (29)

tony, where can these new gaskets be had??

and where shoudl i get a new MAP gasket?
ive heard guys loading the area with RTV sealant as well....and heard it works...

ShevrolayZ28

iTrader: (4)

I'll probably break down and get one some day but 1200 is a lot of clams for 20 hp. Contemplating this purchase sent me out to the garage where I then gutted my cats lol.

gollum

iTrader: (1)

You can find the fast gaskets here.
http://store.summitracing.com/egnsea...=KeywordSearch

erikthegoalie

iTrader: (29)

thanks! I actually found then at ws6store by chance...but thank you!