i just installed a gt40 manifold upper and lower with a 75mm TB. everything is good, idle is perfect, but i hear whistling. i checked all the vacuum hoses and gaskets.. the ones that need to be connected are all connected. the ones that arent are sealed perfectly. i even put silicon sealant on the threads. theres no way air is getting in. i sprayed carb choke cleaner around and no bogging or bubbles. still once the engine warms up, the manifold whistles loudly on idle. the manifold was ported out alot from the previous owner. could it be just that since the manifold is aluminum the porting made it whistle? i dont know. has anyone had a similar problem??
GT-40 or GT-noisy ??
- Thread starter str8stangracer
- Start date
legalize420
Active Member
that tb is probobly bigger than the intake opening. you said the intake was ported, do you know if the inlet is opened up to 75?
legalize420
Active Member
legalize420
Active Member
willys1
Active Member
dont go back to stock!! Get a 65mmlegalize420gt95 said:it might be the inlet tube is crookedi would suggest going back to the stock tb.
legalize420
Active Member
willys1 said:
maybe if it was free. i would spend the money on something that would do something.
willys1
Active Member
legalize420
Active Member
IMO, you dont need a bigger tb until you do a h/c/i or a power adder. you might have a minimal gain but its not worth it to me. i would get something else before that on a basicly stock motor.
willys1
Active Member
If I did a H/C/I I wouldnt bother with a 65mm!! It does make a difference on a stock motor.Do all the little mods and in the end it adds up!!legalize420gt95 said:
DarkProphet
Founding Member
umm this might be a stupid suggestion. but I know with my bbk TB it kinda squeals when i press the throttle. If its doing it all the time, the opening in the intake might not be big enough as suggested, creating turbulence on the backside of the throttle blade, and making it squeal a little too.
fastimes69
Founding Member
My old TrickFlow Street intake used to sound like that at idle. It sounded like a whistle type sound. It's normal I guess, I had a 70mm tb and it ran great!!
gcwh02
New Member
the bbk throttle bodies are known for their whistling, if your not leaking vacuum it could possibly be that if you are sporting a bbk
legalize420
Active Member
i would check the inlet pipe where it meets the tb. tb's do not whistle. if you hear a whistle something is wrong.
Euphoric306
New Member
- Apr 5, 2004
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bbk TB = teh lose
if you want better performance right now and less noise id suggest a 65mm accufab or maybe a 70mm
i dunno how that would do with your intake ported out to 75mm though
just another ?.... what is the stock intake plenum on a gt-40 intake? its already 70 mm is it not?
if you want better performance right now and less noise id suggest a 65mm accufab or maybe a 70mm
i dunno how that would do with your intake ported out to 75mm though
just another ?.... what is the stock intake plenum on a gt-40 intake? its already 70 mm is it not?
dstanggt50
Founding Member
Depending on how loud the whistle, it might be normal, my gt-40 makes a little noise, but nothing that noticable, but if the hood is open, I hear a little whistle, if you are going to mod in the future, I would just keep the 75t/b for now, of you could put the stock one back on until you get more mods, but I would just leave it.
gcwh02
New Member
str8stangracer, stock TB is def not 70, i think its 60 but its def not 70 because i have a 70mm that is def bigger than my stock, and plus why would companies make TB's smaller than stock?
Michael Yount
Mustang Master
Did you have that throttle body on before the manifold swap? If not, it's probably the throttle body that's the noise maker, not the intake. Many complain of whistling and noise with just about all aftermarket throttle bodies except Ford Racing or Accufab.
7-UP BILL
Founding Member
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