1979 SA RX-7 LS Turbo Build (8.93 @ 153)

[forcefed86]

On 315’s. Yea, if you look one page back I sold the 370 setup and threw in a gen4 4.8 with a small cam. It’s fun getting back to the cheaper JY stuff.

Runs OK for what it is, esp. with the mismatched parts. I still can’t manage to rev it past 6700 or so, RPM just hangs and accelerates slowly. I believe the converter is too tight for the power I’m making. Winter plan is to swap the converter out for a much looser 17-18 stator deal and see how it acts. I think It’s got some 8’s in it easy, if I could rev it ALOT more. This Billet S480 should have quite a bit more left in it with a 4.8 as well.       

[SuperSlow]

I do remember that actually. Guess you have just gone through so many set ups it's hard for me to keep up lol.

I would love to move to an s480 after I'm done with this little 7575, good to know it's working out for you.

[forcefed86]

Still alive... 4.8 put up a new personal best last night of 8.80 @ 158. 



Made it to the track again these last 2 weekends. I found some New "old stock" racing beat FB RX-7 adjustable road racing shocks on the Mazda forums. They don't even make them anymore that I'm aware of. Installed these with some 175lb springs up front on full firm. New tie rod ends and bushings all around. The nose of the car is like a rock now. Removed the limit straps and played with the launch and rear shock settings a bit.

Finally go the new 275 pro bracket radial tire to hook.  Little room to grow on the 60' as well. Basically 4 more lbs of boost and almost running the same times as the 370" motor on 20lbs.

23-24lbs on 13* of timing. Pulling lots of power from the launch as well.

Made a few 9 sec passes going easy on it at first and trying to dial in the suspension. This was a WG pass around 12 lbs.

https://youtu.be/TBk3UYr9rN8

[digitalsolo]

Man, that's hauling!

[FC3S Murray]

Holy crap! Congrats. That is some major acceleration

[forcefed86]

Antique store find!  1979 Mazda Rx-7 cake pan... what are the chances?  Making my kid an RX-7 cake this week!

[digitalsolo]

Hah!   That’s a cool find!

[forcefed86]

May have put this poor car into the wall a couple weeks ago.  I had a good 9 year run! After reviewing the logs, walking the track and looking at the engine nearest I can tell I hit something slick on the finish line. Made a great 8.8x pass at 154 @ 7100 rpm.  .3 seconds later wheel speed went to 178mph and rpm bounced off the rev limiter at 7950. I slid into the opposite lane and skipped down teh guard rail a few dozen times. Managed to walk away without a scratch but the RX-7 is toast.  IF anyone knows of some good caged rollers I'm looking. 

thanks for the help over the years all!

 

[digitalsolo]

Ooof, that’s a bummer.   Glad you’re alright!

[SuperSlow]

Sorry to hear man, was always a really cool car. Things could have been worse though, on to the next one

[MPbdy]

Unreal man sorry to see!  At least you have a datalog to offer some explanation.  It can be awful to not have some peace of mind in knowing what happened.  Sometimes it is just out of your control.  Glad it sounds like you're doing alright.

Not sure if you're just looking for rx7's or other cars are on the menu.  I'm on a number of drag racing classified facebook groups and about 3 times a week I'm seeing caged rollers that I am drooling over - everything from early muscle cars to premium street race-car builds and also late model cars.  Street car to full on drag chassis.