GT-40 or GT-noisy ??

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str8stangracer

New Member

Nov 12, 2005

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Dec 8, 2005

#1

• Dec 8, 2005

• #1

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??

 

legalize420

Active Member

May 21, 2005

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Dec 8, 2005

#2

• Dec 8, 2005

• #2

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

May 21, 2005

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#3

• Dec 8, 2005

• #3

what is under the manifold that you need a 75mm tb?

 

S

str8stangracer

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Nov 12, 2005

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Dec 8, 2005

#4

• Dec 8, 2005

• #4

i ported out the inlet to fit the 75 tb. as for whats under it. nothing really. just wanted bigger for the future

 

legalize420

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May 21, 2005

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Dec 8, 2005

#5

• Dec 8, 2005

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it might be the inlet tube is crooked i would suggest going back to the stock tb.

 

willys1

Active Member

Dec 2, 2003

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Dec 8, 2005

#6

• Dec 8, 2005

• #6

legalize420gt95 said:

it might be the inlet tube is crooked i would suggest going back to the stock tb.

Click to expand...

dont go back to stock!! Get a 65mm

 

legalize420

Active Member

May 21, 2005

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#7

• Dec 8, 2005

• #7

willys1 said:

dont go back to stock!! Get a 65mm

Click to expand...

maybe if it was free. i would spend the money on something that would do something.

 

willys1

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Dec 2, 2003

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Dec 8, 2005

#8

• Dec 8, 2005

• #8

legalize420gt95 said:

maybe if it was free. i would spend the money on something that would do something.

Click to expand...

a 65mm does better then stock

 

legalize420

Active Member

May 21, 2005

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#9

• Dec 8, 2005

• #9

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

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Dec 2, 2003

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Dec 8, 2005

#10

• Dec 8, 2005

• #10

legalize420gt95 said:

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.

Click to expand...

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!!

 

DarkProphet

Founding Member

Aug 19, 2002

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Quakertown, PA

Dec 8, 2005

#11

• Dec 8, 2005

• #11

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

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Jun 27, 2001

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San Benito, Texas

Dec 8, 2005

#12

• Dec 8, 2005

• #12

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

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Jun 20, 2005

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pottstown, PA

Dec 9, 2005

#13

• Dec 9, 2005

• #13

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

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May 21, 2005

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Dec 9, 2005

#14

• Dec 9, 2005

• #14

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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Dec 9, 2005

#15

• Dec 9, 2005

• #15

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?

 

S

str8stangracer

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Nov 12, 2005

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Dec 10, 2005

#16

• Dec 10, 2005

• #16

ya, stock is 70mm. as for going back to a smaller tb. no thnx... id keep the noise before doing that

 

dstanggt50

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Sep 13, 2000

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Woodinville, WA

Dec 10, 2005

#17

• Dec 10, 2005

• #17

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

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Jun 20, 2005

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pottstown, PA

Dec 10, 2005

#18

• Dec 10, 2005

• #18

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

Apr 10, 2002

9,039

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79

Charlotte, NC

Dec 10, 2005

#19

• Dec 10, 2005

• #19

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

Jan 4, 2001

885

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My other car is a Firetruck

Dec 11, 2005

#20

• Dec 11, 2005

• #20

Stock TB is 58mm, i believe