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65mm mustang throttle body

^^^^^

thats what i did. but you have to shave down the TPS mounting point so there was full contact with the plastic part of it
 
95pgt-t said:
true,good call
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Yea, I had to do this as well. I may have access to a machine shop through school so I may see if they'll let me shave down the two 65mm castings I have and then machine in my custom stops. Then the ones I have prepped would just need to have the SVT linkage installed and obviously opened up to accept the larger plate.
 
DemonSVT said:
A 65mm TB gives a throttle response increase on any decent 2.5L or above. Increased throttle response is commonly perceived as an increase in power when it normally does not give any.
A hot 2.5L will see a high rpm power gain with a 65mm TB. High rpm being above 6800 rpm. An optimized 60mm SVT TB flows roughly 320-330cfm without a power loss. If you do the math a typical bolt on 2.5L (with chip obviously) will not surpass 320cfm until past 7200rpm.
A "good" 3L (not oval cams or intakes!) will hit 320cfm at around 6200 rpm. So a 65mm TB will be beneficial as the power curve passes 6000 rpm.
A boosted car is a different matter. Either a boosted 2.5L or 3L will love a bigger TB as long as it is not bigger then the intake tract before it or the manifold behind it.
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May I add another reason this should be a good mod for a 3.0, especially a hot one. Going from a 2.5 to a 3.0 increases displacement about 20%. That means that to breath the same as 2.5, a 20% increase in throttle body area is desired. A 20% increase would be close to 65mm, actually closer to 66mm. That is assuming that is the biggest restriction.
 
yeah. i had a stock TB on my car at the dyno last year at SZ. just after i got back i got my 65mm TB and 75MM maf housing in. the gain from 5000-redline was VERY noticible. i have most the N/A bolt ons so those were the restriction points. i then put a gutted LIM in, and it pulled like crazy. too bad i locked that motor up in a puddle :(
 
99 red SVT said:
any progress on a complete write-up? :)
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I've taken most of the pictures...

All i have left is 3-4 pictures do the rest of the modifying...and do a write up:crazy:

Oh and put some pictures in paint to help point out a few things.
 
DemonSVT said:
Either a boosted 2.5L or 3L will love a bigger TB as long as it is not bigger then the intake tract before it or the manifold behind it.
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I too am interested...anyone know the exact size of the intake pipe directly before the TB on the nautilus kit? 3"? That would be 76.199999 mm. (2.5" = 63.5mm) So, for a boosted tour you might want to go even bigger than 65mm?

Or would we need our intake manifolds to have a bigger inlet right after the TB for this to be useful?
 
SHOgoFast said:
I too am interested...anyone know the exact size of the intake pipe directly before the TB on the nautilus kit? 3"? That would be 76.199999 mm. (2.5" = 63.5mm) So, for a boosted tour you might want to go even bigger than 65mm?

Or would we need our intake manifolds to have a bigger inlet right after the TB for this to be useful?
Click to expand...

Svt inlet for the UIM is 67.3mm. You can even grind t down to fit a 70mm.
 
SVTDEMON said:
When and where will that how to be posted?:cool:
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Oh the write up is almost done. I need to add pictures and will post it.

I always over write things....just because i want to be very clear on what procedures should be taken.:cool:
 
I did this yrs ago and supplied it to a buddy of mine with a 3.0. Bought it back after he sold his car. Never installed it on my 2.5 as I figured it would be too big plus I already had a custom overbored 62mm I made. Now that I have the 3.0 installed it will be going on my motor in the Spring.

I posted a how to c/w digipix here years ago. Find it if you do a search?

I'm a machinist by trade so it was pretty easy once I had the parts. I used a 4.6 SOHC Mustang casting, plate and shaft and an SVT fulcrum. I did have to machine the casting so the fulcrum had clearance. Of course I optimized everything too. Then I made my own adjustable stop which bolts to the upper RH mounting point. I had custom gaskets made so there are no sealing problems or gasket sandwich req'd.

If I can find the pix (new PC) I'll post 'em.
 
DemonSVT said:
A 65mm TB gives a throttle response increase on any decent 2.5L or above. Increased throttle response is commonly perceived as an increase in power when it normally does not give any.
A hot 2.5L will see a high rpm power gain with a 65mm TB. High rpm being above 6800 rpm. An optimized 60mm SVT TB flows roughly 320-330cfm without a power loss. If you do the math a typical bolt on 2.5L (with chip obviously) will not surpass 320cfm until past 7200rpm.
A "good" 3L (not oval cams or intakes!) will hit 320cfm at around 6200 rpm. So a 65mm TB will be beneficial as the power curve passes 6000 rpm.
A boosted car is a different matter. Either a boosted 2.5L or 3L will love a bigger TB as long as it is not bigger then the intake tract before it or the manifold behind it.
Click to expand...

How about a 3.0 with SVT cams?
 
Bradness said:
You cannot use the shaft as it's too short and the seals end up being inside the bore of the casting. Use the fulcrum and the springs from the SVT t-body and the rest of the parts from the 65mm.
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Bradness...you can do both.
 
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