Generation III Internal Engine - Need input on Fast Intake

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

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

In short, yes.

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

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


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.

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

dont bother with a FAST intake, unless you like wasting money or you are spraying
LOL :eyes: fast 78=waste, fast 90=i dont think so

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!

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

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

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.

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.

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

http://www.ls1tech.com/forums/showthread.php?t=527602&page=1

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

Tony M.

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?

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?
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

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...

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.

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...

You can find the fast gaskets here.
http://store.summitracing.com/egnsearch.asp?Ntt=fast&N=700+115+4294925237&Ntk=KeywordSearch

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