I know you guys have said it somewhere before... but are you just running the Rex Inserts for with your factory mounts?? and what "stage" (street, race, etc.)...?? thanks guys!

 

I'm putting one set of the "racing stifness" Rex MMs in this weekend. If its
not enough, I'll add a second set....

 

I hope you have better luck than some, the Rex inserts are known to walk out and disappear with prolonged use or spirited driving. Since they are not held in by anything, like the Prothane and the Energy Suspension, they are held in by a tight fit and hope.[sm=smiley3.gif]

I have the Prothane race inserts in mine.[sm=goodidea.gif][sm=smiley20.gif]

 

Try feathering the clutch, builds up some heat but works for me, another one to try, since i guess your in a stock srt-4 is to air the rear tires up to 40psi and put 20 to 25psi in the front if your still running the stock tires, you will see a diffrence here....but let me give you a heads up...after a few mods it will spin no matter what you do.......and everyone will tell you the same there.

 

I had to launch either too lightly, costing me dearly on the low end with crap 60 ft. times, or go up in smoke with wheel spin and again crap 60 ft. times, all of which cost you with crap 1/4 mile times.[:@]

 

what times are you running rr?
also, i just got the prothane race (red) inserts and the boogers- i can't wait to get back to washington and the track to see what kind of a difference they make (obviously the boogers won't make a significant difference in time, but the crisp shifts are nice).

 

btw, w/out the inserts my best launches were at 2000-2200 rpm and a light feather of the clutch to get off the line w/ just a little wheel slip. not good for the clutch, but good for the launch.
also, w/ a street clutch you don't really need any wheel slip to launch- the reason you need it on a race clutch is b/c there is no spring (it's not really a spring, per se [well, not a coil spring anyway], just a wavy piece of metal) btn the friction material and the surface, so the clutch is either engaged or not, there is no in between like on a street clutch- therefore, you spinning the wheels effectively takes the place of feathering the clutch.
Anyway, my point is that you can rev the engine as much as you want- it's your clutch engagement that will determine your launch. the higher the revs, the more you'll have to slip the clutch. don't go too low though- then you bog. I've found that 2000 rpm is about as low as you want to go. also remember that the more you slip the clutch the more you wear down the material- 2200 seems to be a good compromise.
I'm sure the other guys who go to the track will have some good input for you too.

 

barney

can i rev to 2200 rpms and quickly let go of the clutch? will i get a lot of wheel spin? i read this on a website and i wanted to see if its true

 

You just about nailed it, dude. Clutch engagement is what it's all about and 2200 is a good starting point. Haven't had any tire hop issues at that point....it seems to grab real well and pull like a mother.....

 

Several factors came into play, only 2 hours sleep the night before (not really an issue since I'm use to that), a well known slippery track (that was a big factor however) and my first time at the track with my SRT-4. My 60' times were my death at 2.5's. One run was nothing but wheel spin with very little wheel hop, I never did get the lower insert in yet. The cars was also running fairly hot at around 210-215 deg. at the starting line, and that is after 30 minute b.reaks between runs. I might have been better off running back to back runs. The poor launches obviously show up at the big end as well. I only made 4 passes, the best being an ultra poor 14.643. My trap speeds show that I should be running lower times, but then again the poor launches take there toll on that as well keeping me at 98+ MPH. I need to get to a better track, which me and my friends that went this past weekend are going to go to a better track that is known for good traction, so I should have far better times that should reflect the cars true performance.