well went to the track tonight for some R&D made 2 passes back to back went 12.2's@ 111 with a terrible 1.90 60 ft. 3rd pass hot lapping it went 12.30 @ 109.5 i lifted near the finish line because i felt a small vibration. i figured 1 of my tires thru a weight and made it unbalanced. so i go back to the pits put in my JLDIABLO Test chip. let the truck cool down and i head down to the staring line heat up the old slicks and launch it HARD! to my suprise WAM! there goes the drive shaft snapped in in 2 pieces! man was i glad i had the loop on it saved my fuel tank from getting hit by the drive shaft and possible saved the truck from fire! so what ever you guys do Get a Loop! even if it isn't mine! its definatly worth it! JL

------------------
93 cobra 10.90@127.00
99 lightning (black)
E.T. 12.06
best mph 112
60 ft. 1.65
(All Throttle No Bottle!)
JL ram air
JL Powercooler
2# pulley
Level 10 shift kit
Test Converter!
DiabloSport Dist.!
(KEEP IT BETWEEN THE LINES!)
_ _ _ _ _ _ _ _ _ _ _ _ _
JohnnyLightning Performance
E-mail: jlightningracing@cs.com
JohnnyLightningWebpage
svtperformance.com
diablosport.com

 

Your new chip just makes too much power.

Was it the original '99 L driveshaft? Did the actual shaft split or one of the u-joints?


------------------
Mark
'00 Lightning
'79+ Corvette

 

JL,
Sorry to hear about your driveshaft Glad the loop saved more damage!! I just installed mine two days ago, it was VERY easy to install - hope I don't need it.

------------------
01 Silver Lightning
Delivered 3-20-01
JL Stage II Ram Air
JL Power Cooler
JL Diablo Chip
JL Drive Shaft Loop
JL Level 10 Shift Kit
MT ET Streets
Best time to date - (before JL Diablo) 12.954 @105.33
60' = 1.911

 

Pictures, we want pictures... Destroying stuff rules... Lets see the gore.

 

The drive shaft wasn't the origanal 1. it was a JDM driveshaft. i got the original steel back in now! i'll be doing some more testing this fridaynight with the steel 1 and i'll see if there is any difference.... JL

------------------
93 cobra 10.90@127.00
99 lightning (black)
E.T. 12.06
best mph 112
60 ft. 1.65
(All Throttle No Bottle!)
JL ram air
JL Powercooler
2# pulley
Level 10 shift kit
Test Converter!
DiabloSport Dist.!
(KEEP IT BETWEEN THE LINES!)
_ _ _ _ _ _ _ _ _ _ _ _ _
JohnnyLightning Performance
E-mail: jlightningracing@cs.com
JohnnyLightningWebpage
svtperformance.com
diablosport.com

 

johnny: man, glad you and the L are ok! do you have a catalog or price sheet detailing your custom parts and mods?

 

I will be having pictures up today sometime, sorry i don't have a catalog as of now but i'm working with PDQPerformance to get this off the ground. going to be awhile.....JL

------------------
93 cobra 10.90@127.00
99 lightning (black)
E.T. 12.06
best mph 112
60 ft. 1.65
(All Throttle No Bottle!)
JL ram air
JL Powercooler
2# pulley
Level 10 shift kit
Test Converter!
DiabloSport Dist.!
(KEEP IT BETWEEN THE LINES!)
_ _ _ _ _ _ _ _ _ _ _ _ _
JohnnyLightning Performance
E-mail: jlightningracing@cs.com
JohnnyLightningWebpage
svtperformance.com
diablosport.com
pdqperformancewebpage

 

JL,

Sorry to here about your driveshaft. I am very glad the damage was contained!
I'm looking forward to seeing you and Sue @ WFC4!

Later,
Jake...

------------------
2000 Black Lightning
#54 of 4966
NLOC #476
PSP full meal deal
Level 10 shift kit
Innovation Pro-Sport lid
BedRug
Wet Okole seat covers
AIM 2" rear drop

13.870 @ 100.52 stock
13.087 @ 104.80 mods

jacobs@revealed.net

 

JL,

Glad to hear you didn't damage your truck or yourself. These things are a lifesaver, well worth the money. Here's some of JL's pics.





------------------
99 Lightning, Bassani exhaust, JL Ram Air, Daiblo Chip(JL Programmed), Level 10 shift kit. 90mm MAF 12.7 at 107.39.
Next up: Lower Blower pulley Throttle Body.

[This message has been edited by 99svtlightning (edited 04-26-2001).]

[This message has been edited by 99svtlightning (edited 04-26-2001).]

 

Glad that everything is OK JL (who would I get my stuff from if it wasn't) . That is why most tracks should make that mandatory. It is something that costs so little but could save you so much if anything ever happened...Although pics would be real cool

------------------
2000 Silver Lightning
13.20@103.4 MPH
JL Chip
JL Filter
JL Ram-Air
JL Driveshaft Loop

 

JL, glad to hear the loop kept the damage down. What concerns me is that the drive shaft broke. Does anyone know the torque rating of the JDM drive shaft? I would think that it is too early for fatigue to cause the break. How does the break look? A close up of the break would be interesting. I am going over to the SVT web site and post the same concern. JL, how much torque do you estimate that you are getting at the flywheel? You did say it broke at launch so there is a multiplier for the gear ratio also.

 

Sorry to hear about you mishap JL, but glad to know you were prepared.

For the price of admission, adding a driveshaft loop should really be one of the first mods any of us do. Maybe seeing this happen to JL will be a wake up call to all of us.

 

I don't know the Torque rating for the "JDM" shaft, But I do know that the shafts JDM sells are factory '01 Lightning shafts. Looks like the '01 Lightnings will have their own problem areas. I can see it now, '01 Ligtnings with 2000 shafts! I knew there was a reason I kept my steel one. Lloyd

 

EGADS!!!!!

Sorry to hear the shaft died yet VERY glad to see the loop did it's job, SAVING YOU AND THE TRUCK.

In looking at the break point, the back half may have done some banging around on its own.

Respectfully,

Happily Looped

 

From what I remember from school That is an odd failure. Normally anything round failing from torque results in a spirol failure. Yours is almost straight across. That would indicate out of ballance or a weak section in the tubing. It is also a little odd that it is close to the center of the shaft. A torque failure would normaly start at a stress riser like the welds. Just an observation.

Hope this helps

Andy