[schmitty426]

Are all plenums 75 MM? I'm looking to get a throttle body and plenum combo the 70 MM setup but every plenum seems to be a 75 would this be ok to get with a 70 MM without FI?

---------- Post added at 09:40 PM ---------- Previous post was at 09:39 PM ----------

Get with a 70 MM throttle body**

 

[Uhh taken]

Yeah get 70 if your not going FI

 

[schmitty426]

Would that be ok to run even with a 75 MM plenum?

 

[Uhh taken]

IMO I'd get 70 both

 

[schmitty426]

IMO I'd get 70 both

Where can I find both 70? I can only find the tb 70

 

[Venomouz831]

Have you checked LMR? AM or CJ

 

[schmitty426]

Have you checked LMR? AM or CJ

Both AM and CJ don't put in their descriptions what size the plenums are and lmr offers a 70 combo but the plenum is a 75.

 

[Uhh taken]

On AM the accufab 70mm tb and plenum are both 70mm and it's what I run on my gt. definatly gained some go and throttle response. Can really feel it after 3k rpm.

 

[BigB227]

On AM the accufab 70mm tb and plenum are both 70mm and it's what I run on my gt. definatly gained some go and throttle response. Can really feel it after 3k rpm.

+11 after 3k rpms I can definitely feel my car pull harder

 

[schmitty426]

On AM the accufab 70mm tb and plenum are both 70mm and it's what I run on my gt. definatly gained some go and throttle response. Can really feel it after 3k rpm.

Damn that would be an awesome feeling.. to bad its way out of my price range lol

 

[Mzilla]

The Accufab is what I used to have on my 04 and it has been proven to make more power the all other setups available. There was a bunch of dyno comparisons in muscle mustangs and fast ford years ago.

 

[cliffyk]

The upper plenum, stock or aftermarket, has a 75 to 78 mm opening at the TB--there is no such thing as a "70 mm plenum". Also, the stock plenum is the weak link in the intake tract, if you examine Accufab's flow bench tests you will see that any aftermarket plenum, with the stock 65 mm TB, will out flow the stock plenum with any size TB.

After market plenums are 3/4" to 7/8" higher than the stock unit which allows a wider (internally) passage through the 90° bend. Ford should have replaced the upper plenum when the PI upgrade was introduced--they did not as it's only real effect on the PI 2V is to roll-off the power a bit faster after 5500 rpm. If you were warrantying Mustang GTs you might not consider that as being a bad thing either.

Also and as stated by others above, 70 mm is the optimal size for any n/a 4.6 L 2V build--this is also spoken to on my Accufab flow data page.

In the last, the OP make want to read the "Beginner's guide to bolting-on power gains" sticky...

 

[Uhh taken]

The way I see the prices are that you get what you pay for.

 

[cliffyk]

The Accufab is the prettiest and most expensive, they all perform basically the same with no particular brand having any significant advantage. Some of the B&K throttle bodies have throttle plate shaft binding problems due to a weak design...

 

[bottlefed04]

I bought a 70mm tb and just ported my stock plenium. Plenty of air flow

 

[Polar Bear]

I bought a 70mm tb and just ported my stock plenium. Plenty of air flow

I like that idea better.

 

[schmitty426]

I bought a 70mm tb and just ported my stock plenium. Plenty of air flow

How did you do that?

 

[bottlefed04]

With a port and polish kit of jegs and a few carbin bits with a air drill

 

[schmitty426]

With a port and polish kit of jegs and a few carbin bits with a air drill

Any tips for the process? Or is it pretty simple..

 

[bottlefed04]

Pretty simple. Just be careful