75 mm Throttle Body vs. 70 mm - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 8 Old 05-23-2007, 10:23 PM Thread Starter
 
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75 mm Throttle Body vs. 70 mm

I am building a 331 to accecpt a turbo. I have a RPM II and 75mm throttle body. I need to open up the intake from 70 to 75 mm to accecpt the throttle body. Is this worth it, or should I just get a 70mm? I am concerned about getting the metal shavings in the intake and not being able to remove all of them. Thanks.

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post #2 of 8 Old 05-24-2007, 01:07 PM
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I would pull the upper off if you plan on going that route but you could also just leave it as it is and run the 75mm

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post #3 of 8 Old 05-26-2007, 04:16 PM
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Do not leave it and just run the 75 it would not be a work at all, I can't think of the terminology to use but it creates some sort of airflow issue since the incoming air hits the restriction, someone chime in if you know how to say what I am trying to say.
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post #4 of 8 Old 05-27-2007, 03:47 AM
 
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Turbulance?
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post #5 of 8 Old 05-27-2007, 08:26 AM
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Ammm ? What block and rotating assembly is this being built around ???
A 65mm with flow 550 rwhp with ease...The whole induction pipeing would need to be atleast 3 1/2 inches all the way through..
Yep take upper manifold off and open inlet up....

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85 Lb inj Custom cam ,P 2000 Haltech ecu...4x's 2 coil wasted spark ignition.Twin SC 61-2s with Dart block, 330/4340 Crank, Oliver rods,7.9/ comp c C.P pistons.. 482 rwkw/ 646 rwhp..A.P 4 pot brakes...TKO
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post #6 of 8 Old 05-29-2007, 01:59 AM Thread Starter
 
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I am building a 331 with a stock block for now. I have a complete DSS forged rotating assembly: -18cc pistons, H-Beams, 4340 crank, girdle, windage tray. I will be using AFR 185's, unported. I have an Edelbrock RPM II, unsure of cam right now. I will be adding a turbo, but plan to run low boost for now. Later, I plan to upgrade the block to a Dart Iron Eagle or possibly Boss. The car probably will see very little, if any, track time with the turbo. It will run NA for some time before I ever get the turbo.

I ported and polished the TB opening to match the 75mm Accufab TB and it came out very nice.
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post #7 of 8 Old 05-29-2007, 01:02 PM Thread Starter
 
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Finished pictures.





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post #8 of 8 Old 05-29-2007, 03:09 PM
 
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Quote:
Originally Posted by turboLXstang View Post
Do not leave it and just run the 75 it would not be a work at all, I can't think of the terminology to use but it creates some sort of airflow issue since the incoming air hits the restriction, someone chime in if you know how to say what I am trying to say.
That makes no sense whatsoever........If what you're saying had any truth, then a bone stock motor would lose power by bolting on a cobra or Track Heat intake......
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