Throttle Body Options?
#31
Rainman
Rennlist Member
Rennlist Member
how big can you go with regards to the inside size of the plenum?
a 4.6L mustang before 2005 has a 65mm throttle stock with a 4-bolt square flange. as someone suggested you could just cut off the original and weld on a new one. should be able to pick one up for pennies at a boneyard...be creative to get the TPS working.
http://www.ebay.com/itm/Throttle-Bod...428800&vxp=mtr
a 4.6L mustang before 2005 has a 65mm throttle stock with a 4-bolt square flange. as someone suggested you could just cut off the original and weld on a new one. should be able to pick one up for pennies at a boneyard...be creative to get the TPS working.
http://www.ebay.com/itm/Throttle-Bod...428800&vxp=mtr
#32
The Audi TB needs to be rewelded on one side to reproduce the "square" bolt offset of the stock TB. I attached it on the inlet plenum by tightening the bolts from the inside of the plenum. It works 1 to 1 with the stock TPS. Might be a PITA to proceed the same way on a stock intake, but I see little point using a larger TB on the stock intake anyway.
#33
Rennlist Member
Thread Starter
The Audi TB needs to be rewelded on one side to reproduce the "square" bolt offset of the stock TB. I attached it on the inlet plenum by tightening the bolts from the inside of the plenum. It works 1 to 1 with the stock TPS. Might be a PITA to proceed the same way on a stock intake, but I see little point using a larger TB on the stock intake anyway.
#34
Rennlist Member
how big can you go with regards to the inside size of the plenum?
a 4.6L mustang before 2005 has a 65mm throttle stock with a 4-bolt square flange. as someone suggested you could just cut off the original and weld on a new one. should be able to pick one up for pennies at a boneyard...be creative to get the TPS working.
http://www.ebay.com/itm/Throttle-Bod...428800&vxp=mtr
a 4.6L mustang before 2005 has a 65mm throttle stock with a 4-bolt square flange. as someone suggested you could just cut off the original and weld on a new one. should be able to pick one up for pennies at a boneyard...be creative to get the TPS working.
http://www.ebay.com/itm/Throttle-Bod...428800&vxp=mtr
Thanks Spenser. I just went ahead and purchased one of these. This unit looks promising and at $29 it is worth having it to see if I can make it work. Thanks again. I will post up what I find.
#35
Rennlist Member
Tonight I used my Arduino logger to measure pressure drop across the TB. At 1 Bar the minimum pressure drop through the TB at WOT was 1.3 psi. No doubt at mid to high power levels the stock TB is a restriction.
#36
Administrator - "Tyson"
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Lifetime Rennlist
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Larger throttle body, interesting topic.
The most powerful road going 928 in history uses a stock 928 throttle body:
https://rennlist.com/forums/928-foru...deo-added.html
The owner is a good local friend of mine. He did a lot of testing and found the smaller 928 throttle body (compared to larger aftermarket units) was preferred to keep air velocity higher versus overall volume from a larger unit.
He also liked the pedal to throttle plate ratio build into the stock Porsche unit.
The most powerful road going 928 in history uses a stock 928 throttle body:
https://rennlist.com/forums/928-foru...deo-added.html
The owner is a good local friend of mine. He did a lot of testing and found the smaller 928 throttle body (compared to larger aftermarket units) was preferred to keep air velocity higher versus overall volume from a larger unit.
He also liked the pedal to throttle plate ratio build into the stock Porsche unit.
#38
Administrator - "Tyson"
Lifetime Rennlist
Member
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#39
Rennlist Member
The 4.6L mustang before 2005 65mm throttle body does indeed looks to be a nice cheap option. I picked one up on Ebay for $29 shipped. I think Spencer suggested looking at it (thanks man!). These TB's are available in abundance. Worked on adapting it this weekend. Not bad and I was able to make a fairly simple adapter plate so I can use the 951 TPS. The flange has just enough room to drill the factory intake pattern. Even the 951 throttle cable fits perfectly with no modification. I plan on testing it later this week.
#40
Addict
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Rennlist Member
Not exactly small TB
#41
Rennlist Member
Thread Starter
Shawn, thanks for the update. If you get a chance, would you mind measuring the spacing of the original mounting holes on the throttle body? I'd be putting it on an aftermarket/SFR manifold (set up for a 928 TB), so curious how close it would be.
How is the throttle cable pull range compared to stock -- think it will create the same pedal travel length as stock?
Are you planning to pressure test it -- I'm always a little leery of n/a throttle bodies being able to contain 20psi without blowing out like a popped balloon...
How is the throttle cable pull range compared to stock -- think it will create the same pedal travel length as stock?
Are you planning to pressure test it -- I'm always a little leery of n/a throttle bodies being able to contain 20psi without blowing out like a popped balloon...
#42
Rennlist Member
Shawn, thanks for the update. If you get a chance, would you mind measuring the spacing of the original mounting holes on the throttle body? I'd be putting it on an aftermarket/SFR manifold (set up for a 928 TB), so curious how close it would be.
How is the throttle cable pull range compared to stock -- think it will create the same pedal travel length as stock?
Are you planning to pressure test it -- I'm always a little leery of n/a throttle bodies being able to contain 20psi without blowing out like a popped balloon...
How is the throttle cable pull range compared to stock -- think it will create the same pedal travel length as stock?
Are you planning to pressure test it -- I'm always a little leery of n/a throttle bodies being able to contain 20psi without blowing out like a popped balloon...
Hole spacing on the Mustang TB is 3" x 2.6"
Pedal travel will be less as the MTB has a 0.6" radius vs 0.9" on the 951. I will see how it feels later this week.
I will pressure test it for sure. I am also curious about the idle air screw.
#44
Rennlist Member
#45
Rainman
Rennlist Member
Rennlist Member
The 4.6L mustang before 2005 65mm throttle body does indeed looks to be a nice cheap option. I picked one up on Ebay for $29 shipped. I think Spencer suggested looking at it (thanks man!). These TB's are available in abundance. Worked on adapting it this weekend. Not bad and I was able to make a fairly simple adapter plate so I can use the 951 TPS. The flange has just enough room to drill the factor intake pattern. Even the 951 throttle cable fits perfectly with no modification. I plan on testing it later this week.