Launch rpm for F/S. 396 ,325hp ?
 

What should I be leaving at ? I 've only tried it once at 4500 rpm an it spun to a 1.78 60 ft. I have 2.98 1st gear,538 rear gears. 30x9 hoosier radials, 8 inch wheels .caltrac springs and bars. Any advice would be great I'm new to stick cars.

Re: Launch rpm for F/S. 396 ,325hp ?
 

Most people have a terrible time hooking up radial slicks on a stick car.

We ran Hoosier bias ply tires on the G/S Camaro we had.

What front springs and shocks are you using?

What bushings and ball joints?

What clutch system are you using?

Re: Launch rpm for F/S. 396 ,325hp ?
 

Comp,products 3 way adjustable set 80 20' fronts, strange single adjustable rears set all the way soft, front springs are morosso, heavy small block, uncut . Stock moog ball joints, neopreim front bushings with teeth ground off. Aluinuim flywheel with ram clutch 3 finger pressure plate.

Re: Launch rpm for F/S. 396 ,325hp ?
 

I strongly suggest that you talk to Mcleod tomorrow about a complete Soft-Lok setup for your car.

http://www.mcleodracing.com/index.ph...l?options=cart

You can spend more money, and you might be a little quicker. But most are best off with the Mcleod Soft-Lok.

Re: Launch rpm for F/S. 396 ,325hp ?
 

Your running a 5.38 rear gear with a 325 hp BB Camaro stocker? To even try to get radials to work on a stick car you would need low clutch press. I would run a M/T bias stick tire with that combo. gsa612

Re: Launch rpm for F/S. 396 ,325hp ?
 

Before going too crazy put some stick tires on there and try it. I use Mickey Thompson 3056st's with great success, but the most important part is to make sure the tires are bias ply for a stickshift car, not an automatic.

You said ram 3 finger pp. What size and compound or type disc? Any counterweight on? How much base pressure?

Re: Launch rpm for F/S. 396 ,325hp ?
 

Most stick racers are running the same tire Jim stated, it is a stick tire. I don't think anyone in Stock has had success making a Radial work. Is this a new clutch? Did it come from Tim Hyatt? Or did you buy it from Jegs or Summit? Base pressure should be less than 300.

Sean

Re: Launch rpm for F/S. 396 ,325hp ?
 

With your setup, leave at an idle, or around 2500. You might have a chance then. Need to go to a bias stick tire when you wear yourself out with the radial. Then you will find it easier to make the car work. Good luck

Re: Launch rpm for F/S. 396 ,325hp ?
 

The 30x9 Hoosier stick bias ply slick in D07 compound should work well. I have gotten decent results with a South Bend clutch, iron disc, borg and beck pressure plate--not as refined nor adjustable as the soft locker stuff, but inexpensive and works if the right clamp load is put into the pressure plate. You need a little slip in the clutch and have to run the sintered iron facing with fairly low clamp load to get the slip. Other facings, organic, kevlar, brass ceramic, won't hold up.

Re: Launch rpm for F/S. 396 ,325hp ?
 

The rear shocks for a stick are going to need to be set tight and not loose. I would unload the radials, as they are just a waist of your time and the money with fuel and trying to learn a clutch setup. You can make the Ram clutch work unless it has the cast iron CW levers and is not a low base pressure unit. But those can be replaced with a lighter billet lever. Just need more info on the clutch to be able to help. Tire pressure and suspension settings are going to be completely different than an automatic setup.

Sean

Re: Launch rpm for F/S. 396 ,325hp ?
 

Update I lowered caltrac bar to lower hole no pre load, switched to 90-10 on fronts and lowered launch to 4200 then 4400 went 1.72 then 1.66 60 foots. Both dead hooked.not fast but much better. I will figure out what clutch stuff I got. Thanks for info.

Re: Launch rpm for F/S. 396 ,325hp ?
 

IMO If you've got it dead hooking keep raising the launch RPM's until you get about 1 full revolution of the tire. Then tire making adjustments to the clutch, chassis, tires, shocks etc... to get it to dead hook again at your new launch RPM once you get that then keep raising the launch RPM again until you get your 1 revolution back. Obviously the time slip (60') will be your guide. Just my .02

Re: Launch rpm for F/S. 396 ,325hp ?
 

Mike Taylor 3601

Re: Launch rpm for F/S. 396 ,325hp ?
 

If he is still running radial slicks, it will be very difficult to get only 1 revolution of the slicks. I have used both the M/T 9x29.5 3056STs, as well as the Hoosier 9x29 D07s, both worked great, although the M/Ts seem to not "go away" as severely when they reach the end of their life. On my car, when fresh, the Hoosiers are a tick better on 60foots.

Re: Launch rpm for F/S. 396 ,325hp ?
 

My experiences have been the same as yours Roy and yes I don't know if he's going to have any luck with the radial I've never tried them myself.

Re: Launch rpm for F/S. 396 ,325hp ?
 

Ok, the 3056st is a stick tire but what effect would that tire have with an automatic car?
What is the build difference of the 3056st to the 3056? Is it just compound or constructed different as well?

Re: Launch rpm for F/S. 396 ,325hp ?
 

The sidewalls, although not really a stiff sidewall, are stiffer than a normal slick. I also believe that the tread compound is a bit harder.

Re: Launch rpm for F/S. 396 ,325hp ?
 

That is what I have understood as well. That being said, if you have an automatic car that hooks with the st tire would the stiffer sidewall help with reaction and performance? Will the st still grow as much as the non st?

Re: Launch rpm for F/S. 396 ,325hp ?
 

Next time will be in 2 weeks I will defiantly try to get the 1 revolution and see how it pays off. I have rear shocks set second softest setting I was thinking of stiffing them think it would help 60 ft times?

Re: Launch rpm for F/S. 396 ,325hp ?
 

We have been testing off an on with a clutch set up that we can run radials. In the right conditions it can be good. The cool track and whatever led you to dead hook can be reason it works now. If you race on normal summer conditions be prepared for disappointment if you think it will work when the track gets hot or you just have too much hit to hold it. It is a very very fine line. When the radials start to spin you can go from a 1.40 60 foot to 1.70. 😁

I think that radials can be faster someday. I have gone 10.70's in E stick with them. But I don't have a big enough tuning window with them to leave them on all the time. Too easy to roast them on the line for me anyway.

Let us know how it goes and take video if you can.

Re: Launch rpm for F/S. 396 ,325hp ?
 

Has anyone used Phoenix bias slicks on a stick car with any luck?