SouthFL.02.SS

I'm getting a whistle noise coming from 2000-3000 rpms (when under part throttle acceleration, and while sustaining that rev range).
The whistle does not occur at idle or at WOT.

I've taken off my TPIS 90mm TB and reinstalled it to make sure it was on right and the sound/whistle persists. Does this sound like a TB leak? Or, is this a common noise with the FAST 90 intake?

HumpinSS

iTrader: (1)

Hope this isnt your issue but here is somethig to check

https://ls1tech.com/forums/generation-iii-internal-engine/285743-afr-205-fast-90-sealing-issues.html

SouthFL.02.SS

I've read that thread. I sure hope this isn't the issue with mine. I just got over the whole FAST TB nightmare. This is becoming a HUGE inconvenience.

SouthFL.02.SS

Seems like I'm not the only guy....
https://ls1tech.com/forums/showthrea...intake+whistle

SouthFL.02.SS

Strangly enough, the whistle wasn't there with the POS FAST TB. Maybe it's the TB. In fact, I hope it's the TB and not the LSX manifold. I'll take off the TB again and put it back on again to make double sure it's not a TB leak.

I've found it could also be the MAP sensor (thanks Smokin' Joe), or it's an intake leak.

I've read a few methods for finding intake leaks, but none sound simple. Any suggestions before I go out and purchase a stethoscope and a straw?

So many "could be this" or "could be thats" are every bit as helpful as they are discrouraging, but I'd rather hear people's feedback.
Thanks.

xssive

iTrader: (123)

Mine sounds like a damn supercharger sometimes. It makes a crazy loud whistling noise randomly at low throttle...

SouthFL.02.SS

Same thing here.
And you're ok with this? Do you know what's causing the noise?

Edit: WAIT, just read your sig.

tonyb

I am the one with the other thread on sealing issues.My TB whistles at closed throttle only from the air being sucked through the closed throttle blade.I have no problems at higher rpms other than the POS TB sticking occassionally.If you know anyone with a shop that does emissions work they will have a smoke machine that is the easiest way to check for leaks.You plug the TB opening,Disconnect your PCV line from the intake and inject smoke in the manifold port.This injects about 4psi of smoke that will billow out any leak you have in the motor.If you were closer I'd tell you to stop by.
Good luck
Anthony

SouthFL.02.SS

Thanks for the tip!

xssive

iTrader: (123)

Haha, my sig is old. I am running n/a now and it makes the horrible noise. I have the 78mm version without the foam underneath. It has an mti tb on it now. Does the fast tb have an idle hole in the tb blade? My mti tb doesnt and im thinking thats the cause

SouthFL.02.SS

No hole in the blade in either the FAST or the TPIS.

tonyb

The Fast TB does not have a hole but that would only be the cause at closed throttle.

tonyb

Beat me to it

John02SS

iTrader: (47)

Mine has whistled since the FM13 install. The FAST didn't cure it so I give up! I glued the MAP down as it kept coming out and didn't use the padding under the intake.

SouthFL.02.SS

I'm getting a severe case of OCD over this! Wish I could forgettaboutit, but I can't (yet). I'll do some more investigating over the next couple days. I need to get my cousin to hold revs while I listen carefully around the intake tract.

Beast96Z

iTrader: (21)

I'd be willing to put money on the TB. The sligtest little imperfection in the intake tract could cause a whistle. This used to be a big problem with BBK TB's. As far as the MAP is concerned, Drk Phx had a sweet right up on how to correct it. It involved a spacer and longer bolt for the bolt next to the map. Basically a metal arm sticks out over the top of the sensor and sits on top of the spacer. It worked out great for me and I can't forsee any problems with it.

LawmanSS

iTrader: (19)

All these problems with the FAST and the various TBs is making me want to scrap the whole project! ...where's the Tylenol? lol

1fstGM

iTrader: (13)

Mine whisltes too. Only at part throddle though. At full throddle it doesn't.

93LS1RX7

iTrader: (8)

Here is a strange question but I read about this probelm earlier.

Where is the PCV port on the TB? Is it up stream or down stream of the TB blade? I heard TPIS had the issue where they had it wrong.

SouthFL.02.SS

Called TPIS yesterday and the PCV is before the throttle blade (as it should be), I checked it with them on the phone. All of their new batches come with the hole before the blade.
Good catch though.