Rx7 rear end

[Eric AZ]

How much does the RX7 rear end need to be narrowed on each side?

[Alvin]

How much does the RX7 rear end need to be narrowed on each side?

Great how-to and info here from Spriso:
viewtopic.php?p=116659&hilit=spriso+mazda#p116659


Narrowing will depend on your suspension type and wheel fitment. I've seen 48" total or about 4-5" off each side.

[Eric AZ]

Oh that might be perfect with the flares at stock length. Thank you

[Alvin]

Oh that might be perfect with the flares at stock length. Thank you

Please measure your own setup first!

[Gregs672000]

Oh that might be perfect with the flares at stock length. Thank you

I have a narrowed one installed in my car. I think it will need to be narrowed unless you are flaring the rear. I have flares that give a little extra room and work well with my wheels (Cosmics from the '70s or '80s, not sure on the offset) with a 205/50 15 tire. If there's some easy and useful place for me to measure without pulling the wheels off I'd be happy to check. I don't have the vented discs shown in the above pic... I think that's an upgrade or a different year. The RX7 rears are getting hard to find.

[drieseck]

sort of off topic.........Greg, your aero is quite intentional, we need to be educated. Do you (looks like) block all the ducts to regulate specific flow to air-in-grill? Or/and, are you minimizing air moving under the car via the engine compartment to moving it around the car? I know you have a specific duct behind grill direct to the intake. Thanks for the help.
BTW, very nice 67.5 2L -----------------still being improved and driven.

[Gregs672000]

sort of off topic.........Greg, your aero is quite intentional, we need to be educated. Do you (looks like) block all the ducts to regulate specific flow to air-in-grill? Or/and, are you minimizing air moving under the car via the engine compartment to moving it around the car? I know you have a specific duct behind grill direct to the intake. Thanks for the help.
BTW, very nice 67.5 2L -----------------still being improved and driven.

Well... I wish I could say something like "Yes, its been extensively tested in a Boeing wind tunnel..." or some smart aleck response, but to be honest it's all just based on what I thought looked good ! The front dam is one of Dean's, slightly modified to attach how I wanted, then driving lights in the bumper bracket holes and gold colored mesh or plate in other spots... but no, I don't do anything special to route air, except to make sure the scoup for the rad is well fed. We definitely drive air bricks, but compared to the Z cars I've driven fast the Roadster felt less nose light vs the (stock) Z. The Roadster has always felt sort of planted to me, but I can't say I've driven the best Zs to compare.

[drieseck]

success, it looks great, thanks