To further clean up our engine bay, we turned to JP3 Motorsports for their Mazda RX7 FD3S Brake Booster Vacuum Tubing Simplification Kit.
This plug-and-play kit eliminates the long factory hardline mounted on the firewall and shortens and simplifies the vacuum tubing for the brake booster on left-hand-drive FD RX-7s.
We disconnected the vacuum line that runs from the brake booster to the firewall mounted hardline and then removed the ugly hardline.
We bolted the CNC aluminum adapter to the intake manifold. I really like how they designed this adapter with a Viton o-ring seal instead of a traditional gasket. We then attached the included -6AN ORB to -6An swivel fitting and stainless steel flared tubing, and connected the factory rubber vacuum line to it.
This was a very quick and easy install that greatly cleans up and simplifies the FD RX-7’s engine bay. In my opinion, the JP3 Motorsports FD3S Brake Booster Vacuum Tubing Simplification Kit should be done on every FD.
9 comments
This is a no-stone-left-unturned kind of build and I am glad you are documenting it! I hope you make a video at the end covering everything you have done over the years.
Thank you. We will do a video recap at some point.
I had no idea the stock TB was so complex. It’s actually pretty cool, and I’m sure it was a great setup for a stock or closer to stock engine, but I can only imagine the new e-throttle will give far better drivability and support making more power on the new engine.
but a 5% reduction in size… I’m surprised they didn’t find an option that was just barely larger, instead.
If you consider the throttle shafts into the equation, the effective area is actually the same. I would imagine that a single butterfly impedes flow less than several smaller ones.
LS3 throttle body is 90mm but the motor is huge and probably wouldn’t fit very well here.
What bothers me most is that the throttle pedal spacer in installed the wrong way up. That’s going to cause some serious issues.
Lol. You’re right. It’s upside down. Well, should be an easy fix.
Ha, you’re right. Good catch. What serious issues will it cause?
It will cause no issues whatsoever. It just doesn’t line up with the opening in the carpet and that’s too much for my OCD.
GrantC – There’s a hypothesis that a much smaller 74mm TB will perform better at power levels up to ~500whp… That might need testing.