Is the '91 RX-7 (FD) impossible to tune without the slip?

[scarslasher]

My friend on another forum wants me to help him tune his RX-7 to stop him from slipping out every time he turns.

The car slips like it's on ice when he turns in Autumn Ring Mini.

I've tried adjusting the suspension, the downforce, just about everything. But I can't seem to stop this monster from slipping without introducing a HECK of a lot of understeer.

Even RACING SOFTS can't keep it from slipping out occasionally.

Is it simply not a racing car and more of a drifter?


P.S. Note that the guy I'm tuning for has pretty much fully-tuned the RX-7 aside from turbochargers. No turbos at all.

 

[chuyler1]

Did you add a wing yet? It's a sure way to lock down the rear end on a car that wants to break loose on every turn. Start with the default downforce and increase it until you can open the throttle up.

 

[scarslasher]

Did you add a wing yet? It's a sure way to lock down the rear end on a car that wants to break loose on every turn. Start with the default downforce and increase it until you can open the throttle up.

Yes, even with the highest downforce (20), it still wants to slide its rear all over the road like it's on ice.

 

[scarslasher]

Should also note the guy refuses point blank to add racing softs. He's stickign with sports softs maximum. :/

 

[Rotary Junkie]

Should also note the guy refuses point blank to add racing softs. He's stickign with sports softs maximum. :/

And well he should.

The early FDs are absolutely maddening to make easy to drive and aren't particularly quick once you eventually do... What I will say is that putting the rear ride height a bit higher then the front should calm it noticeably; I've mostly given up on mine though just because it's nowhere near grippy enough to be competitive.

 

[oppositelock]

What's the current setup?

 

[NjLowrider]

Rear toe at 0?

 

[blah941]

You remind me of my ZR-1 RM (Regardless that the ZR-1 had racing hard tires and a lsd. It still wanted to kick out) have more front camber and less rear camber. Then put both front and rear toe to 0. From there tune the rear to have more toe and the front toe. I almost forgot to mention that you have to tune your toe adjustments to toe in. Here's an example of all I just told you.

F/R

Camber: 0.7/0.2

Toe: 0.1/0.2


This kind of combination has a the tendancies of oversteer and understeer. Hopefully it will provide the result you are looking for. If not. I wouldn't mind working on it.

BTW - Be careful with the rear toe. It is a very powerful variable in the suspension. It can override your other adjustments if you're not careful.

Oh yeah! Camber first, then toe and do your tuning one tik at a time. If you want to see if your tuning is working. Tsukuba is a popular proving ground. It's also the place to have your car kick out to the extreme!

 

[Mopatop]

Is your friend any good at racing? Is he coming completely off-throttle on turn in? He might be experiencing lift-off oversteer.

 

[crossup]

my feeling is that these cars just want to have the tail out, once I accepted that it thought it was a drift car, I was amazed at its traction and how you could control the car at least up to a 90 deg slide with ease