[scxc15]

So I have someone wanting to sell me an Accufab Plenum and 75mm throttle body for a very good deal. Only thing is seems like I recall a 75mm throttle body being too much for a stock GT... What mods would you need so that it wouldn't hurt it?

[DARKHORSE02]

I Just Asked This Question From A Rep At American Muscle. It Wont Hurt Anything You Just Wont See The Advertised 7-11 Hp Gain. I Believe Big Mods (cams, Lt, Blower) Is Where You See The Benefit Of A Larger Tb. I Cant Tell You This From Experience And I Hope Someone With Hands On Know Can Be More Helpful.

[wishIhada5.0]

I run a C&L/BBK 75mm tb/ JLT fenderwell setup and I can tell you first hand that its not to much. F/I will really make it shine though

[Trick Tuners]

On a near stock car the hp gains will be near 0. 7hp is hardly enough to measure on a dyno and that is probably with a 400+hp car.

[RALVAREZ26]

when i put mine i wasn't expecting any HP gains really i just wanted a better throttle response when i step on it, which is exactly what happened!

[03gtfirered]

plus the real restriction is in the plenum. you'll see more of a diff in the plenum swap then TB.

[njstang]

Originally Posted by 03gtfirered plus the real restriction is in the plenum. you'll see more of a diff in the plenum swap then TB.

+1, tb and plenums wont net you much hp, the rule of thumb seems to be 70mm for n/a cars and 75mm for sprayers or boost. im sure if you have some radical cams and head work that a 75mm would work better than a 70mm but for you adverage mustang with bolt ons 70mm is plenty. it is a fact that the stock plenum is the restrictive part of the intake, not as much the TB

[bullitt ak]

there not gunna do much unless you have forced induction basically...

[Abe02GT]

Accufab/JLT combo looks mean. I smile every time I open my hood.

[00gtCoolGuy]

i recently installed a jlt, 75 mm tb, and plenum on my basically stock GT and knocked off .3 of my ET and gained about 2 mph on on my trap

just get a 75 mm, it won't hurt and allows room to grow

[UnixHH]

my 75 mm accufab plenum and throttle body made me looose low end torque and gain like 1 hp up top. (so the dyno tells me) but it did help alot when i put the cams and blower on it

[Hasselm8]

Originally Posted by Abe02GT Accufab/JLT combo looks mean. I smile every time I open my hood.

+1 Too bad shes totaled now, But I had the 70mm Accufab tb and plenum + JLT and the set up was mean. 75 mm wont net you much in hp but if you got cam work scheduled than it is worth it, otherwise 70mm is fine.

[jivepepper]

Originally Posted by 00gtCoolGuy i recently installed a jlt, 75 mm tb, and plenum on my basically stock GT and knocked off .3 of my ET and gained about 2 mph on on my trap just get a 75 mm, it won't hurt and allows room to grow

Exactly +1

It won't help more than a 70mm but won't hurt either.

[Trick Tuners]

Originally Posted by njstang 70mm for n/a cars and 75mm for sprayers or boost.

Quick tip: You don't need extra intake volume for nitrous. The "air" is in liquid form and injected thru the N2O system. It may slightly increase the VE, but i would be really surprised to see more than a 2% increase in air flow at the maf.

[jivepepper]

Originally Posted by Trick Tuners Quick tip: You don't need extra intake volume for nitrous. The "air" is in liquid form and injected thru the N2O system. It may slightly increase the VE, but i would be really surprised to see more than a 2% increase in air flow at the maf.

It might not be measured at the maf but there has to be more volume or there wouldn't be more power.

[Trick Tuners]

Originally Posted by jivepepper It might not be measured at the maf but there has to be more volume or there wouldn't be more power.

The extra air "volume" comes in the form of liquid N2O

[jivepepper]

Originally Posted by Trick Tuners The extra air "volume" comes in the form of liquid N2O

Which releases it's O2 from the nitrous molecule when it's introduced into the warm engine. It is still a pressurized volume of oxygen which is easier and safer to deliver to the engine attached to a nitrogen molecule.

You're adding an additional volume of oxygen or you wouldn't be making more power. It's canned O2. The reason you can't use just pressured O2 not already attached to a nitrogen molecule is that it's to flammable and would blow your head off in that form.

Again my point is that you can not increase power in an internal combustion engine with out increasing the air flow. So there for nitrous has to increase airflow.

[Trick Tuners]

Originally Posted by jivepepper So there for nitrous has to increase airflow.

There is no increase in air flow, only in the (O2) "air" in the combustion chamber. (well maybe if you spray the N2O pre maf, which is stupid if you ask me). You got the basics of N2O down, but i think you are confused on where the "air" is coming from.

[jivepepper]

Originally Posted by Trick Tuners There is no increase in air flow, only in the (O2) "air" in the combustion chamber. (well maybe if you spray the N2O pre maf, which is stupid if you ask me). You got the basics of N2O down, but i think you are confused on where the "air" is coming from.

It's coming from the the 1000lbs+ psi compressed nitrogen being shoved in the motor and releasing O2 when it hits the hot combustion chamber.

There is an increase in oxygen volume. Might not have the same volume as a Sc or turbo because the O2 in the atmosphere is at a lower concentration but it is still an increased in volume of O2 or there wouldn't be an increase of power.

A supercharger/turbo might have to move more for the same effect, but in a different way it's doing the same thing.

[Trick Tuners]

I think we are a little off topic. My original comment was this.

Originally Posted by njstang View Post 70mm for n/a cars and 75mm for sprayers or boost. Quick tip: You don't need extra intake volume for nitrous. The "air" is in liquid form and injected thru the N2O system. It may slightly increase the VE, but i would be really surprised to see more than a 2% increase in air flow at the maf.