I've had this project on the back burner for the better part of the last year and a half, but it is finally done. 75mm tb on an A32 3.5 swap with a functioning IACV.

• The TB is an aftermarket 75mm TB produced for a 86-93 Mustang, redrilled and clearanced to fit the VQ35DE TB bolt pattern, tb mounted upside down to make throttle cable routing a bt easier.
• Throttle Cable bracket was fabbed from a random aluminum bracket I had previously removed from the car and bolted it to the firewall in place of the cruise control unit (for now).
• The IACV is a VQ30DE-K IACV Housing with a Pathfinder IACV, mounted onto the TB with an adapter plate I fabbed up.
• Throttle Cable Pulley is off of a VQ30DE.
• I wasn't thrilled with the way the original throttle cable return spring felt, so I replaced it with one from a B14. Note, this spring winds in the opposite direction than the VQ30DE throttle cable return spring.
• The TPS is a stock 86-93 Mustang TPS wired up to a salvaged A32 TPS connector, making it plug and play.
• No cruise control, unfortunately. I am currently looking into other 75mm TB where I can retain an IACV and CC.

As expected throttle response is increased, but low speed driving requires more attention than before as the throttle only needs to be held open 1-2% to maintain speed at 45mph according to my scangaugeII. Though the twitchiness at low speeds could also be attributed to the throttle cable being mounted to the Chassis, rather than the engine - even though I have all 4 poly engine mounts.

Before Portmatching





Everything bead blasted and port matched




75mm Mustang on left, 70mm PFTB on right

 

Damn, nice job! I saw an article in Grassroots Motorsports where they tested NWP's 75mm TB on a 350Z and they saw some decent gains in the mid range. Any chance you have before/after dynos?

 

Pretty cool adaptation.

I toyed with the idea of a Mustang TB both on the 5.5 gen upper and 7th gen upper but just stuck with a converted 7th gen TB.

 

Thank you, I did not dyno this. My butt dyno likes the throttle response, but thats about all I can say about it.

The crappy part about the 7th gen manifolds is the lack of clearance on the left side of the TB due to the VIAS. Otherwise, an LS1 TB would fit almost perfectly with a 4 bolt LS tb adapter plate. A 2V mustang tb would also be a decent candidate, but the tb flange is just a hair too small for the 7th gen UIM bolt pattern.

Right now I'm working on making a 75mm northstar tb work with the 7th gen upper, which also has provisions for an IACV.

 

Nice work as always

 

There's not enough room even with the butterfly on the firewall side (and plate orientation flipped)?. If I were to do anything other than adapting an oem TB I would have to do 78mm bore. LSx could be had with such if I googled correctly.

 

Thanks Chris!

Nope, if anything extends past the bolt holes (TPS in this case) it will hit the manifold. Most, if not all TBs will need to be rotated and have the throttle cables run on top of the manifold.

 

always nice to see something new