Last Updated: 08/12/2021 @ 08:41 am
Community Member Credit: schmellyfart
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 clearance to fit the VQ35DE TB bolt pattern, TB mounted upside down to make throttle cable routing a bit easier.
- The 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 another 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 Port Matching
Everything bead blasted and port matched
75mm Mustang on left, 70mm PFTB on right