mikes ss

iTrader: (10)

I recently installed my fast intake (78mm) on my Z06 I can really feel a differance thru the rpm range car does pull harder (sop dyno)the only problem I have is when giving throttle there is a whistle sound at idle no problem smooth idle no codes .is the whistle normal on these intakes?

JPH

iTrader: (2)

make sure the intake is not cracked around the intake bolts areas. they have been known to do this, and whistle.

vettenuts

iTrader: (4)

Did you buy it used? A lot of guys sell them used and don't warn the buyer about the special button head screws required for the valley cover to prevent cracking the bottom part of the FAST manifold.

mikes ss

iTrader: (10)

I bought the intake new but did not see where the button head screws go?
the instructions were not very clear where do they go?

00T\A

I have a MTI 78mm TB and it whistles also.
I think it may be your TB nothing to worry about alot of the ported ones do it.

mikes ss

iTrader: (10)

Iam using a stock throttle body not ported

vettenuts

iTrader: (4)

There are butten head screws that replace the ones in the valley cover. The instructions to put them in are on the top of page 3. Have you checked your idle vacuum? If you didn't use the bolts, the bottom is likely cracked. You may need to pull it, check the bottom, and fix with JB Weld if it is cracked. Change the valley bolts at the same time.

caviness

iTrader: (14)

they are located on the plate right under your intake.take the factory ones out put the button head ones in. hope its not cracked.

Tony Mamo @ AFR

iTrader: (13)

If someone can send me a good digital pic of the front opening of the intake I will repost it with an arrow in the area that needs to be modified to cure your whistling ailments.....I always hated that whistle....found it kind of annoying.

I may even have a 78 banging around AFR somewhere I can snap a pic of.

Tony M.

mikes ss

iTrader: (10)

I pulled the intake off again replaced the intake valley cover screws with the button screws did not see any cracks on the intake,thank goodness
reinstalled still has the whistle only when you give throttle (wtf) sounds like around throttle body

Please keep the help coming Guys, I hope Tony has a intake laying around to show were the dreaded whistle is coming from.
Thanks everyone for all the help

Orange Juice

iTrader: (3)

I have a 90mm fast and a 90mm NW tb. This was installed with a FM 13 and the intaked whistled all the time, car sounded like it was supercharged. Had to have the engine rebuilt but kept the same combo. After it was put back together it never whistled.

Michael02hawk

iTrader: (26)

Is this design 'flaw' only found on the 78mm FAST intakes or is it the same on the 90mm as well?

HotWhipT/A

iTrader: (31)

My car whistles too. Although, its got a stock LS1 intake that has never been touched. I ported my TB and it whistles for a second when you give it gas. I did change to the WS6 lower ram air box at the same time though. My hood is cut where you can see straight into the MAF (clear lid). Its a faint whistle and more like a sucking sound. I really like it!!!!

NHRAFORMULA00

iTrader: (2)

i have the 90/90 fast intake and it whistles also, I was told by one of the sponsors that they have a distinct whistle too them.

orangeapeel

iTrader: (18)

My car is so loud, I could not even tell you if it whistles or not.

<------------- 78mm here as well.

00formLs1

ported my tb on sunday and its whistling also. why do ported tb do that?

orangeapeel

iTrader: (18)

Did you leave something that would cause a turbulent swirl of air going through the TB? Or port out around the butterfly?

00formLs1

butterfly was ok. its pretty smooth theres one small inperfection thats higher then the rest, i need to go back and smooth that peice out. could that be what cause a whistle? it only does it from about 10-30mph

orangeapeel

iTrader: (18)

Nah, your exhaust is not loud enough...That is the real problem!

00formLs1

then the problem should be fixed in a month. gettin some TD dumped before the axle