Contour Enthusiasts Group Archives Forums Modifications Duratec Performance 70 MM Throttle body.

I just realized I have an old Mustang TB on my desk at work, I think its a 65mm though, I'll have to measure it.

Hey, you don't happen to have an old 5.0 block on your desk, do you? My Ranger needs some more torque

I think you would probable see a deseint gain seeing how us se people switch to the svt throttle body even with it not being port matched and see a noticable gain,snappier throttle response,and theres dyno evidence I think its 5 hp.

Well...I drove it with the new throttle body in today. There definitly is a performance gain. How much I'm not sure of. It also feels like I'm getting more torque out of it, both low end and high end.

--Matt

hate to burst your bubble but i would get that think dyno'd before you go spreading ideas in peoples heads about huge gains. a larger throttle body on a 2.5L n/a duratec engine will most likely cause a drop in hp/tq espcially in the low end tq range due to a decrease in air velocity. svt used a 60mm tb for a reason, they didn't just pick numbers out of a hat. now mistergrym might actually find a good use for that considering he is probably loosing 10-20 hp from that tb bottle neck on his... but like i said forced induction is a whole other animal...

I'm not intentionally trying to put ideas into peoples heads. All I am going by here is what I am seeing in my car. I do drive it everyday and with the new throttle body, I have to say that there definitly an increase. As to how much I don't know. And yes I will be getting it dyno'd soon. I want to make my intake pipe first. I should be finished with that by the end of the week.

--Matt

Now the big question.

Did you hog out the intake manifold?
Otherwise that larger throttle body is worthless as the opening size is now the restriction! Food for thought...

Even the SVT 60mm TB could benefit from this port matching... Also I don't see how much larger you could go. 10mm is a ton to try and hog out... Don't remember seeing that much meat, but then I was looking at it compared to the 60mm unit???

gutting out the manifold or not, i still think you are loosing way too much air velocity with a larger tb. 70mm is probably too much for even the 3L, but like mark(mistergrym) said 73 would be ideal for the vortech. in size vs. velocity there is a peak point at which velocity is greatest, and an increase in size will cause a loss in velocity. Just think of it this way, if mcdonalds gave you a straw or a 4 inch (diamete) pipe, which do you think you could get more coke through in the same amount of time? The straw, you probably couldn't even the the coke to your mouth with the pipe, it is the same principal with your car's engine. Now if you hooked a blower to the bottom of your coke cup then the straw becomes a bottle neck and the 4 inch pipe becomes more ideal. just some food for thought... hehe

I am ver interested too. I want one!
Like the other guy asked, did you port match the intake manifold to the new TB or was the opening big enough already.
Did you buy yours new from a dealer?
Can't wait to see more pics showing the modification to the brackets.
Keep us all informed.

my .02

I don't think putting in a larger TB will reduce velocity. Changing the size of the TB is not like changing the size of a straw.

Think of the TB like a washer at the end of the straw. Keeping the straw (this would be the manifold) the same size and then increase the size of the the washer (this would be the TB) would only decrease the amount of air flow restriction.

What I'm wondering is if the intake manifold inlet has to be enlarged to match the size of the TB.

Mmars have any pix of the TB?