Will 60 footers have effect on MPH?
 

Just curious as I have not paid enough attention to this. I traped right at 100mph tonight but only cut a 8.0 with a 2.3 60 footer. On et streets. Good burn out, 20psi in tires, dumped it at 6-7k and spun bad.

mph will usually stay about the same... it might go up a hair.

ok, as long as it does'nt drop. I need to trap over 100 to get my goal..

That's a really bad 60ft for ET streets. Why were they spinning like that? Are those an old set of tires? Any vids of the passes? I'm just curious because I have friends that don't do a burnout and still cut in the 1.7-1.9 area.

Anthony

I here you.. Anthony. I used cut 1.8's on street tires, cut 1.7 on drag radials. My first pass tonight was a 1.73 . This was my first trip back to the track in almost 3 years..lol

I looked at my logs from tonight and on that pass I left at 7300rpms. So either the tires were not hot enough or 20psi in them was too much?? Either way I just need some more seat time and I will get them down to the 1.5-1.6's.. Any sugestions are welcome!

oh.. brand new tires. The very first passes tonight.. I just suck!

I think thats too much air, i don't run any more than 15 and usually end up dropping to 13 by the end of the night.

Im agree with zinx i never go up to 20 psi unless the track is hooking to good ive run 1.52 at 15 psi at 7800 launch.

Do it over till you get it right!:lol: :icon_tup:

I hope to be back this weekend if I am not out of town.. I will try 15 psi. I am not afraid to break the rear end so no holding back! But I did expect to trap a tad higher?

100 MPH through the 1/8th is pretty decent. Definitely good for a 10 sec pass with a good 60', need to chop about a second off that ET though.

I also have to get my boost under better control. Creep on every pull. I may just go with a 20 psi spring.

when you blow the tires away, you're mph will generally be higher.......

20 psi on ET streets is what I keep in the tires for the drive to the track..........

I then drop them to 10-12 psi. I've tried 8 psi before, that was a wild ride on the big end.......

I went to the track for midnight drags sat with the street tires and with a blistering 2.04 60 ft i ran 7.81 in the 1/8 but 11.67 1/4 at 124.97 mph. On the et's i run 7.0 1/8 at about 100 mph. I was suprised at the trap speed on the street tires it was almost as fast as my 10.8 runs!:Wconfused Oh the clutch is fading fast i wish i had $1600 for a twin disc!!

SO how does the 60 foot change the 1/4 et? I know it is about equal in the 1/8th to shave whatever comes of the 60 comes off the 1/8 et...?? Same in 1/4?

I am so ready to go back out for another try!

For every 1/10th you shave off your 60ft, you gain 2/10ths on top. Start with like 14 psi cold. After your burnout it should go up to 15 - 16psi. Good luck!!!

Anthony

Very good interesting thread. I suck at driving so it seems I can not get any better than a 2.0 60' in an Rx-7. My typical launch is 15 psi in old ET streets, but only 5-6000 rpm. At 15 psi boost and 400 rwhp, I've gone 8.0 @ 93 / 11.5 @ 124. I'm hoping that when I slightly improve the short time (maybe a higher rpm launch?), I'll be deep in the 7s / 10s.

how are you guys having such problems i cut a 1.97 on some all season pzero's @ 32 psi on stock wheels 225/50/16
http://img.photobucket.com/albums/v1...50303_4938.jpg

I see the key to your sucess your takeing a power nap before you launch!:rlaugh:

Just kidding, you are probley slipping the clutch and getting a pretty good time. But when your running a higher h/p single turbo with out a twin disc slipping the clutch heats the clutch and causes slipping!:icon_no2:

Try doing that with someone above 200 hp.

Again, a 1.8 and above is the norm for a good driver on street radials (not drag radials). I used to slip the clutch and pull these pretty regular. Now I am trying to dump the clutch (no slipping) at 7500rpm with 200 more whp..take some pratice.. Reason a ran a 2.36 was from the amount of wheels spin I had. Seems a 1.4-1.5 is good with ET streets. I thought is was pretty decent time for the worst 60 foot time ever posted on the internet! LOL

That 2.7 in the right lane from that time slip has you beat. :lol:


What suspension are you running?

haha yeah, i dont worry about reaction times. I go when im good and ready :) stock base suspension with broken diff bushings and clunky pillowballs

actually on track with the thread, I have noticed that when i got a horrible launch (wheel hop) i would trap a little higher 85ish i guess because i spend more time on the track? so from what ive seen there is a little difference.

LOL.. I think that may be the worst 60 footer ever!

I am running JIC coilovers. Pretty damn stiff too. Not a drag set up at all. killer on the round track! All I did for the last day was soften up the rear damping and stiffen the front. I was thinking of lowering the height in back and softening up the preload as much as I can.

Think I have to go out of town this weekend so it will be the following before I can run again. I think tire presure is going to make a big differance as I just check them and they are at 22psi! So I imagine once I heated them up at the track they were close to 24psi!

Aren't you supposed to stiffen up the rear and soften the front for a drag lauch??

Trial and error what works for one may not work for another! There are alot of varabiles!

Thats why racers rent tracks for testing and tunning chassis.