70 or 75 mm tb help! - Mustang Evolution

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Old 11-04-2012, 10:53 PM   #1
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70 or 75 mm tb help!

I have a 2000 mustang gt I'm not sure if I shud get a 70 or 75 mm throttle body and wat plenum? I have bbk CIA, underdrive pullies, x pip, catback exhaust, 3.73 gears, Accel coil pack with upgraded sparks. Plan on getting headers very soon maybe even intake manifold. What wud be the best combo for my stang
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Old 11-04-2012, 11:00 PM   #2
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i wouldnt go to big it could hurt the car not sure about this but does the plenum come attached to some after market manifolds?
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Old 11-04-2012, 11:08 PM   #3
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No plenum is a seller ate Bolton part that connects inbetween the TB n intake mani
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Old 11-04-2012, 11:15 PM   #4
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Get the 70mm anything bigger is to much and you will lose a little power. Dyno proven that the 70mm gives the most power.
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Old 11-04-2012, 11:20 PM   #5
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I saw a guy do dyno tests with a 75 mm TB n c&l plenum n it put out 3 more hp then a 70mm TB with the c&l plenum though that's the only reason I'm not sure
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Old 11-04-2012, 11:58 PM   #6
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84mm
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Old 11-04-2012, 11:59 PM   #7
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You only need a 75 if your gonna run boost.

---------- Post added at 09:59 PM ---------- Previous post was at 09:59 PM ----------

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Originally Posted by Slow2V View Post
84mm
You've got a 4v though lol
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Old 11-05-2012, 12:05 AM   #8
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Anything g over a 70mm is just gonna reduce your air velocity on a N/A motor. If you plan on getting some FI pretty soon then I would say the 75mm otherwise the 70mm should work just fine.
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Old 11-20-2012, 12:47 PM   #9
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The guy from American muscle said the 75 with plenum combo wud be great for it but also said its best to just get the 78 mm n that it won't hurt.
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Old 11-20-2012, 12:50 PM   #10
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Quote:
Originally Posted by Joeyd5
The guy from American muscle said the 75 with plenum combo wud be great for it but also said its best to just get the 78 mm n that it won't hurt.
Iam no expert but that sounds really big might not be the best for the car could lose power what are your plans for the car in the future for mods?
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Old 11-20-2012, 01:04 PM   #11
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Yea I no I'm not sure he was right. But I plan on finishing my exhaust with headers, most likely gunna get a intake manifold eventually n not sure wat else yet
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Old 11-20-2012, 01:06 PM   #12
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Well unless ur going to get forced induction then I would go with a 70 mm
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Old 11-20-2012, 01:13 PM   #13
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Unless your forcing air to it it really shouldn't matter at all
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Old 11-20-2012, 01:32 PM   #14
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Quote:
Originally Posted by Joeyd5 View Post
The guy from American muscle said the 75 with plenum combo wud be great for it but also said its best to just get the 78 mm n that it won't hurt.
Joeyd5,

We hooked our 2000 GT up with the BBK 78mm TB/Plenum, Airaid CAI, Pypes O/R Xpipe, and a Bama custom tune. After getting a baseline bone stock run, we saw zero negative effects from running a 78mm TB/Plenum in lower rpm. In fact we picked up solid hp and tq gains throughout the entire power band!



Hopefully this helps your decision and clear things up for you.

Shane
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Old 11-20-2012, 02:11 PM   #15
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Originally Posted by AMShaneLesky View Post
Joeyd5,

We hooked our 2000 GT up with the BBK 78mm TB/Plenum, Airaid CAI, Pypes O/R Xpipe, and a Bama custom tune. After getting a baseline bone stock run, we saw zero negative effects from running a 78mm TB/Plenum in lower rpm. In fact we picked up solid hp and tq gains throughout the entire power band!



Hopefully this helps your decision and clear things up for you.

Shane
It would not show up at lower rpms, but at higher revs and WOT. Also yours is hardly an "apples to apples" back-to-back test; your changed too many parts to know which one or combination of them produced the gain.

The next step would be to remove the BBK 78 mm TB/plenum and install almost any aftermarket upper plenum and a 70 mm TB. I believe you will find that the upper end improves a bit as the 2V benefits from all the charge velocity it can get.

The stock upper plenum is restrictive, as is the catted 2-1/4" stock mid-pipe. Just improving those and a good tune would produce very similar results...
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Old 11-20-2012, 02:44 PM   #16
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Probably a dumb question but how do u know what size tb u have? Is there a part that u measure. Mine was on the car when I bought it and have never purchased one
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Old 11-20-2012, 03:03 PM   #17
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U get the measurement by the diameter of the t/b opening .. And yea I saw the dyno test but u did one test with it n didn't compare it to maybe a 75 were its 3 mm smaller so it might have a better amount of airflow pulling in and produce a better outcome then the 78.
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Old 11-20-2012, 06:43 PM   #18
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I took a 70 off of an f150 on a stock setup with short ram what a huge difference especially because it cost me nothing best mod I've done so far
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Old 11-20-2012, 08:01 PM   #19
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Go with a 70mm
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Old 11-20-2012, 10:26 PM   #20
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Quote:
Originally Posted by Venomouz831
Go with a 70mm
Plus one... Bigger is not always better, also people will tell you whatever to sell a product to you. Not bashing AM I'm just sayin...
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Old 11-20-2012, 10:49 PM   #21
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I have the 75 mm accufab TB and plenum set up on my N/A 04 gt and man wat a huge difference and I only have the basic bolt ons(mid pipe,cat back, cai) I've being running it for almost 2yrs now and no problems at all... Your PCM should b able to rich up your air/fuel mixture if the amount of air going in is your main concern
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Old 11-20-2012, 10:52 PM   #22
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I also did the Accufab 75mm setup on my car and saw a good difference to my car. Plus 70-75 I don't think you will see a noticeable difference just by driving the car, but you will no matter which one you get feel a difference over stock.
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Old 11-21-2012, 12:49 AM   #23
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Yea I'm leaning more towards the bbk 75mm tb with a c&l plenum
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Old 11-21-2012, 07:15 AM   #24
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Quote:
Originally Posted by Faststallion98 View Post
I took a 70 off of an f150 on a stock setup with short ram what a huge difference especially because it cost me nothing best mod I've done so far
Is 70mm stock for f150s?
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Old 11-21-2012, 07:43 AM   #25
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Originally Posted by jdavis96gt

Is 70mm stock for f150s?
Yup, 4.6/5.4 both come stock with the 70mm.
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Old 11-21-2012, 08:43 AM   #26
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Yup, 4.6/5.4 both come stock with the 70mm.
So I could just get TB and plenum off f150 and throw it on?
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Old 11-21-2012, 09:22 AM   #27
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Originally Posted by jdavis96gt

So I could just get TB and plenum off f150 and throw it on?
I'm not a 100% sure, I would think if you have a 4.6 and got the stock 70mm off a 4.6 truck it should bolt right up. But again I'm not a 100% sure on that.
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Old 11-21-2012, 09:40 AM   #28
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I'm not a 100% sure, I would think if you have a 4.6 and got the stock 70mm off a 4.6 truck it should bolt right up. But again I'm not a 100% sure on that.
That would be alot cheaper than buying one if it would work.
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Old 11-21-2012, 10:41 AM   #29
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Originally Posted by jdavis96gt

That would be alot cheaper than buying one if it would work.
Yea it would, I would go to a junk yard and find one you could prolly pick one up for really cheap. Im pretty sure it would fit but like I said I'm not a 100%
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Old 11-21-2012, 05:54 PM   #30
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Originally Posted by cliffyk View Post
It would not show up at lower rpms, but at higher revs and WOT. Also yours is hardly an "apples to apples" back-to-back test; your changed too many parts to know which one or combination of them produced the gain.

The next step would be to remove the BBK 78 mm TB/plenum and install almost any aftermarket upper plenum and a 70 mm TB. I believe you will find that the upper end improves a bit as the 2V benefits from all the charge velocity it can get.

The stock upper plenum is restrictive, as is the catted 2-1/4" stock mid-pipe. Just improving those and a good tune would produce very similar results...
What I meant to show is "apples to apples" comparison with the OP's car, since we both have similar mods except the intake plenum/TB. The video was a good example of showing what his power band will look like with the BBK 78mm plenum/TB and show how hp/tq does not suffer with this mod. I'm not saying a 70mm can't make better power or equal power, I'm showing the power increase over stock will be extremely noticeable and efficient even with a large 78mm plenum/TB. If the OP is satisfied with the power-band of our 78mm setup, he may be interested since it will support more drastic mods down the road even better than a 70mm (centri. superchargers, nitrous, cams, CNC heads).

Just wanted to clear the air a little. I appreciate your input though!

Shane
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Old 11-21-2012, 06:47 PM   #31
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Quote:
Originally Posted by AMShaneLesky

What I meant to show is "apples to apples" comparison with the OP's car, since we both have similar mods except the intake plenum/TB. The video was a good example of showing what his power band will look like with the BBK 78mm plenum/TB and show how hp/tq does not suffer with this mod. I'm not saying a 70mm can't make better power or equal power, I'm showing the power increase over stock will be extremely noticeable and efficient even with a large 78mm plenum/TB. If the OP is satisfied with the power-band of our 78mm setup, he may be interested since it will support more drastic mods down the road even better than a 70mm (centri. superchargers, nitrous, cams, CNC heads).

Just wanted to clear the air a little. I appreciate your input though!

Shane
Yea! What he said........lol
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Old 11-22-2012, 11:51 AM   #32
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As far as the 70 off of an f150 it's a great cheap improvement. The plenum can't be used just the tb and it takes a bit of modding but well worth it over an aftermarket one that is way more expensive and looks nicer but does the same thing
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