70 or 75 mm tb for a 300 horse 4.6?

[lman657]

Hey guys,

the p&p headswap/cams/headers/clutch/exhuast/injectors/maf project is nearly done!

Do you guys think i should go w/ a 70 or 75 mm BBK throttle body for my mustang with 24# injectors and C&L 80mm maf?

Thanks!
Lance

 

[Beau]

bigger = better right? so go with the 75mm

 

[GinoGT]

What kind of intake are you using? I would go for the 75mm just for the heck of it.

 

[KaPPaBaLL]

Hey guys,

the p&p headswap/cams/headers/clutch/exhuast/injectors/maf project is nearly done!

Do you guys think i should go w/ a 70 or 75 mm BBK throttle body for my mustang with 24# injectors and C&L 80mm maf?

Thanks!
Lance

what the hell kind of advice is this???

what year mustang do you have? if you don't have a plenum yet get one. Without it a TB won't do you any good but maybe a 1hp gain. Get the plenum and TB together.

getting a bigger TB without an aftermarket plenum will SLOW the velocity of the air coming in the intake therefore losing power. Do it right the first time..

 

[GinoGT]

Won't a larger plenum slow the air down as well? More flow, but less velocity at a specific rate of airflow.

I'd like to know what kind of intake he has, if he has a Bullitt we might look a little stupid telling him to get a plenum.

 

[lman657]

hey guys,

I'd like to spring for the plenum, however, i've already over-exerted my funds so far. Would it be possible, for the time being, to port the upper intake? I've got all the tools from porting heads, and use that for now until i can work up the money for it? I've been trying to go by the philosophy of "do it right the first time" but the 200 bucks more for an upper intake might be pushing it, as you can see, i've already dumped quite a lot of money into this project.

Thanks,
Lance

 

[Frank 03GT]

hey guys,

I'd like to spring for the plenum, however, i've already over-exerted my funds so far. Would it be possible, for the time being, to port the upper intake? I've got all the tools from porting heads, and use that for now until i can work up the money for it? I've been trying to go by the philosophy of "do it right the first time" but the 200 bucks more for an upper intake might be pushing it, as you can see, i've already dumped quite a lot of money into this project.

Thanks,
Lance

If you're doing everything else, I can't see skipping on the plenum. I went from a ported stock plenum to a C&L and Accufab 75mm TB and felt a very noticable gain. More than I did from my Dr. Gas X-pipe even...

 

[KaPPaBaLL]

If you're doing everything else, I can't see skipping on the plenum. I went from a ported stock plenum to a C&L and Accufab 75mm TB and felt a very noticable gain. More than I did from my Dr. Gas X-pipe even...

true... you running the Accufab 75MM TB and the C&L intake will run you more lean than you actually want the car to run.

Iman, you can P&P the upper stock plenum and put the Accufabs 70MM TB for now and later switch to C&L's upper plenum.

Gino that would be his fault for not telling us what kind of mustang he has.

 

[lman657]

Hey again,

It's a 96 GT with ported PI heads, with comp cams xe270ah grind hot street cams, along with their beehive springs.

 

[RonnieDiaz99GT]

I got a pretty badass n/a 2v myself so I can say with some type of authority to go 75mm ACCUFAB all the way...for the few extra bucks it blows BBK away in quality and performance....this might help also..from an independent test:

 

[Sam98]

The 70mm is probably adequate and will probably give you more torque than the 75mm, but if you aren't finished with your mods the 75mm may be the way to go...

OK...I didn't see the previous post the first time around...sounds like 75 is the way to go.

 

[lman657]

Hey guys, I just picked up a 75mm Accufab with a C&L plenum on ebay for a good price, as you can see by my updated signature. Thanks for the help!

 

[KaPPaBaLL]

ay ronnie, i've heard the accufab 75mm TB and the C&L plenum will make the GT run too lean?

 

[Sam98]

ay ronnie, i've heard the accufab 75mm TB and the C&L plenum will make the GT run too lean?

I don't see how...the engine can get more air, but the MAF will still accurately measure the amount used and the PCM will adjust the fuel accordingly...

 

[KaPPaBaLL]

I don't see how...the engine can get more air, but the MAF will still accurately measure the amount used and the PCM will adjust the fuel accordingly...

thanks ronnie.

 

[claytucc3]

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