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post #12 of (permalink) Old 04-04-2017, 04:20 PM
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Join Date: Dec 2010
Location: SF, CA
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Originally Posted by MaddMartigan View Post
That's pretty good information but I think the challenge I have is slightly different. Basically, I could take just about any of the turns at significant speed without any slip/slide at all. It was only when I gave the car significant throttle that I had the rear end break lose. I think that it was a combination of the temperature and humidity and my power combination. The one problem that one of the Mustang guys mentioned is that since I'm running a 3000rpm non-locking converter that I would end up having more power available to me than I had traction to put down on the course. While this may not hurt me on a longer road course, it will definitely hurt under the conditions I was in for the day.

I went into most of the turns with as much speed as I could get but I had to be careful on the exit because too much throttle caused me to lose grip. In fact, my usage of brakes was actually fairly limited for the day.
I think we are on the same page here -- how do you continue accelerate out of a turn without breaking the rear end loose?
* I haven't dyno'd our tbird but it probably makes an honest 250HP now and a good deal of torque.
* In 3rd gear on a damp surface, you would have to be extra careful around a corner (aka: gently roll onto the throttle vs. just stabbing down like we used to do with the poor v6) or the back end would break free in almost every corner. I believe we are going a bit faster than you through our corners since it's a road course vs autocross but it seems like in the short clip you did a bit of unexpected throttle steering through some of these turns, right?

Q: What kind of gearing do you have in this car and what RPMs does your engine seem to make the most power? Also, on this autocross course, what gear was your car mostly in?

For our car, we have slightly shorter than 3.73:1 gearing b/c of the slightly smaller OD rear tires.
This makes 1st and pretty much 2nd gear fairly useless on the track; Sears Point is quite twisty and we spend most of the time in 3-4-5 (you could drive most of the course in 4th with only a few forays into 5th and a few into 3rd to really launch out of a corner -- when dry)..

Our 302 really seems to pull hardest from 3K-5K RPM. You don't really need to go higher than 5.5K RPM unless you are trying to wring the most out of the gear before the next turn.


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