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Discussing tp 65 vs 70 vs 75 in the 99-04 Forum. I'm planning to get a new TP i see most ppl heer running 70 ...

       

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Old November 1st, 2009, 10:17 PM   #1
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tp 65 vs 70 vs 75


I'm planning to get a new TP i see most ppl heer running 70 and 75
my modsd are magnapacks with o/r h , UDPs, CAI, 373, shift kit(auto) , egr delete ,sct with bren speed email tune
btw what is the stock TP size for 99gt ? will i be able to change teh TP with out the plenum
 

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Old November 1st, 2009, 10:18 PM   #2
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t/b? throttle body?
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Old November 1st, 2009, 10:18 PM   #3
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yep
 
Old November 1st, 2009, 10:20 PM   #4
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ok. people say 70mm N/A and 75+mm FI....imo 70 is good but 75 with bolt ons is nice too.
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Old November 1st, 2009, 10:21 PM   #5
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what is the stock size?
 
Old November 1st, 2009, 10:46 PM   #6
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60mm i think.
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Old November 2nd, 2009, 12:35 AM   #7
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Originally Posted by unblock View Post
what is the stock size?
...come to think of it ...
i dont know.
i think 57.....but that almost seems to small.
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Old November 3rd, 2009, 12:49 PM   #8
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I thought stock was 65mm?
65mm = 616 cfm
70mm = 726 cfm
75mm = 850 cfm
 
Old November 3rd, 2009, 01:15 PM   #9
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can never go wrong with a 70mm
 
Old November 3rd, 2009, 01:25 PM   #10
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If you are asking about a Throttle Body T/B then go with a 75mm and dont look back. I believe the stock size for a 99 is 65mm
 
Old November 3rd, 2009, 02:12 PM   #11
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Stock size is 65mm...
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Old November 3rd, 2009, 08:50 PM   #12
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Hey everything I'm reading is saying 70mm for N/A and not to touch 75 or 78 unless your boosted? Does anyone know the real issues with running a 78 on a NA motor? is there just less benefit or can it actually degrade or cause a problem? I would think for the bbk combo price it would make sense to get the 78mm then if you boost it later it's ready, and if you don't no harm right?
 
Old November 3rd, 2009, 09:11 PM   #13
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a aftermarket TB will work on the stock plenum, the TB will give you a couple HP and make the motor respond faster.
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Old November 3rd, 2009, 09:13 PM   #14
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Originally Posted by 4.10GT View Post
a aftermarket TB will work on the stock plenum, the TB will give you a couple HP and make the motor respond faster.
thanks I got that.. but I'm reading that 75 and 78 is 'too much' for a NA motor? wondering what the downside/drawbacks would be..
 
Old November 3rd, 2009, 11:23 PM   #15
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The 75 is not to much at all. I have ran a 75 for a long time and way before all my other mods. Didn't need a tune and ran great. Nothing bad at all.

Last edited by TorqueO : November 3rd, 2009 at 11:26 PM.
 
Old November 3rd, 2009, 11:33 PM   #16
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I just saw the "Throttle Intake" from BBK. I dont like how you wont be able to change the throttle body. Stick with just the 75 t/b imo
 
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