I'm curious as to what people are doing to their FD's or what launching techniques are being used to get good (1.9 second or less) 60' times. My first 2 passes with my newly 5 speed converted FD on Nitto 555R Drag Radials (@22psi) got me 2.3 and 2.25 60' times. I was launching around 3250 slipping the clutch (ACT Street/Stip) and I was still getting an insane amount of wheel hop. Should I lower the air pressure? Launch at a lower RPM? What about suspension mods or setup? TIA!

 

I've heard that Jimlab differential bushings help alot with the wheel hop. I too am trying to get the low 60' times. I have not been to the track yet but I know that my 97 GSX gets a hell of a lot better 60' times then my FD. I have been trying launches from 2500-3500 and I seem to have better luck at the higher RPM's and slipping the clutch then I do at low RPM's becasue I keeep my car in the powerband from the launch. I tried dumping it but got mad wheel hop and then it bogs down a ton. It's amazingly difficult I think to launch these cars.

 

All the really fast rotary drag cars (and every one else, actually) uses a Ford 9" rear end...

 

JR, this website should definitely help you out.

http://www.rotarypowered.com/faqlaunching.html

 

Easy Solution...

Mickey Thompson Street Et's.
Nice soft tire. I have NEVER felt wheelhop with these.

As for using drag radials, I have heard that the Pettit Launch kit will help.

 

I get 2.005-2.1 sec regularly with my FD. I run my auto-x tires (Kuhmo V700) down to about 22psi and slip the clutch slightly with about a 4500rpm launch. I hardly ever get wheelhop and when I do it is minor.

My TII has a best of 1.982 sec '60 time using the same method. Also little to no wheel hop. This car has Mazdacomp motor mounts if that makes a difference.

Both cars have a ACT street strip clutch. The Kuhmos are sticky but the sidewall is stiff so they aren't ideal for drags. I think the key is to not dump the clutch and try to keep the tires from spinning. I do just a little burnout to heat the tires up some. Not a big smoky burnout, just a little smoke.

Jeff

 

Thanks to everyone who responded, keep the advice coming! Anthony - what size E/T Street fit the stock FD rim?

 

If you MUST use the Nitto drag radials. Drop the air pressure to 15psi, do a healthy burn-out and launch at around 4800.
The best drag radial is the BFG. Very sticky. I average a high 1.6 60' with them. Same thing, drop the air pressure to 15lbs, healthy burn out and launch at 5800rpms.
Using Mickey Thompson ET streets I average a 1.5 60' launching at 7000rpm.

 

What size of BFG's do you use. I only show a 255/50/16 BFG Drag Radial for the stock rims. The Nitto 555R's are available in the stock 225/50/16 size. I know the BFG's would fit but I assume that they would cause a slight variation in the gearing due to the larger size. Slowing the RPM's down and throwing off the speedo and tach a little.

 

I have 17" wheels so it didn't pose an issue. I have 275/40/17's in the rear...I forgot you have stock wheels.

 

I made a 1.41s 60' the other day w/o n2o. Lifted both wheels off the ground and carried it for about 15'. I thought that was awesome.... ran 6.52@106mph and coasted with a 10.59@118mph....

 

BADASS MAN that is sweet steve!

When i was running at ennnis i had 2.1 60 foot times on some crap tires but it is all in how you do it i guess. I did a small burnout, then reved to about 4500 and just dumped her and off i went pretty smooth if i say so my self. i had the tires down to 20 psi and on the stock syspension at that.

 

That's incredible! Do you mind sharing some of your secrets on getting such a great time? Tires used, pressure, suspension setup, etc..

 

118mph is not enough MPH for your 10.5 E.T. what happened? top end problems? you were going for a good blast!!!!

 

Check out https://www.rx7club.com/forum/showth...threadid=60030 for more info. Basicly, he was having engine problems.

 

Read the sentance. He "coasted" through.