Okay here is the short story. The last 2 times I went to the track with my BF Goodrich g-Force drag radials I have broken something in the drivetrain. First time carrier bearing on the intermediate shaft, second time passenger side axle. I now have TCI 300hp axles. I will be running the drag radials again and I have an OEM honda LSD in my tranny with ACT clutch. What would be the best way to launch so that I have the least worry about breaking anything in the drivetrain? I broke both items with 2000-2500 RPM clutch drops because that is what I found to be best with my street tires. First time I got alot of hop and broke the bearing, second time the axle just snapped right at the line. I really don't want to have to slip the clutch. Do you think it would be better to do a higher RPM drop so there will be better chance of the tires giving and not the drivetrain? Let me know.

 

get stiffer motor mounts and possibly radius rods and get rid of the wheel hop.

 

Make sure to get the axles as straight as possible. Try to preload the axles by staging brake or line lock, so the axles don't take that sudden jolt. The axle upgrade should help.

 

no need to just drop the clutch with your setup - i am running 205/50/15 bfg g force drag radials making about 183 at the wheels all motor and i launch about 46-4800 rpm and feather the clutch out will i can feel the tires grab then quickly let it hte rest of the way out, that practice nets me 1.9 60' times with the setup - that initial drop that you are doing is shocking everything driveline wise in your car thus causing the problems

 

Yeah, I am thinking I am going to have to try and feather it. I definitely want some sub 2.0 60 foots next time out. I am just pissed that since the radials I haven't gotten a run down the track without breaking.

 

hey youre from the jbody i saw some new pics of youre car over there the other day nice looking hatch...

 

stock axles (SOHC) 155k miles, 20x8x14 slicks, 85 shot, 7500+ rpm launch/clutch drop.

Stop the wheelhop by lowering your tire pressures.

 

LIGHTEN THE CAR
2540lb car w/o driver launching at 6000 on nitto 555R DRs = 3 broken axles and a LSD
1980lbs w/o driver launching at 6000 on 22/8/15 MTs broke 1 axle.
1685 lbs w/o driver launching at 8000+ same tires = no broken axles. o yeah all OEM axles too.

 

the best way IMO to keep from breasking axles is keep the revs high off the launch as long as the clutch permits, axles break from
A. . . too much traction
or
B. . . some traction trying to break loose and hopping .
or
C. . . car being too low in the front and causing undue stress on the joints.

 

Yep, I broke mine cause of both A and C I believe.

 

Get rid of the wheel hop by installing inserts into the motor mounts. Also look into urethane bushings for the front suspension. Wheel hop is a drivetrane killer.

 

What will cause an axle to break when stock height and making a left turn??? Is that too short axles?

 

pre load

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bruceleeroy &raquo;</TD></TR><TR><TD CLASS="quote"> pre load </TD></TR></TABLE>

define preload.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jared &raquo;</TD></TR><TR><TD CLASS="quote">get stiffer motor mounts and possibly radius rods and get rid of the wheel hop.</TD></TR></TABLE>

Yup..if you dont get rid of that wheel hop your axles are doomed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SeaQuake &raquo;</TD></TR><TR><TD CLASS="quote">

define preload.</TD></TR></TABLE>

preloading basically is when u are preloading force against the axles before u launch so u dont put that sudden force unto where they lock...its easy to do if u have a line lock or u can use your e brake with some cars....have u ever rocked an axle while its in the tranny back and forth?..u can feel that play before it locks..well imagine doing that at 8000 rpm with 26" slicks..see what i mean.

 

QUOTE=SeaQuake]What will cause an axle to break when stock height and making a left turn??? Is that too short axles?[/QUOTE]

that happend to me twice on my old EF.When i had the axle replaced,the mechaninc mentioned that i was missing my lower sway bar.....was sold like that to me After that,i stop breaking that axle on left turns.You could have a loose sway bar.[

 

King Tut yea the feather method is the best way. I was launching on street tires at 6000 and just feathering the hell out of my clutch and pulled consistent 2.1 60'

I cant believe you have had so many problems with axles. When I was on the bottle I was running stock axles and launching at 8000. I never broke one. That was on 22" slicks.

When are you gonna be at the track again? This friday night is the last friday night of the season. Starting 2 Nov. on sundays until spring time. Damn florida is nice, track open all year round.

 

i preload the axles now, and pop the clutch...haven't broken any axles since i've started preloading...best 60ft 1.62

 

Explain this "preloading" a little more.

 

How are you guys preloading? Using the emergency brake?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">How are you guys preloading? Using the emergency brake?
</TD></TR></TABLE>

2 stepper

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by King Tut33 &raquo;</TD></TR><TR><TD CLASS="quote">How are you guys preloading? Using the emergency brake?</TD></TR></TABLE>

yes some are.

 

i use the e-brake, and msd 2-step. You pull up the the first staging light, rev to your set launch rpm, pull your e-brake or staging brake, then slowly pull the clutch until you just feel it grabing. Then inch your way to the 2nd stage light by using the e-brake and then hold yourself at the line with your brake up, and give it ****

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kwik93si &raquo;</TD></TR><TR><TD CLASS="quote"> rev to your set launch rpm, pull your e-brake or staging brake, then slowly pull the clutch until you just feel it grabing. </TD></TR></TABLE>

thats not a easy task when you use an unsprung 4 puck clutch disk like the R4 or R6 of ACT


and for axle snap issue , my friend meanteg : 510 whp GSR , stock tranny with Quaife diff , stock axle and prothane enginemount . using either 22" and 26" slick , 7000 at 8 psi lauch he did not snap the axle so far