Broke the TA on the Dyno..
08-04-2010, 02:41 PM
#1
Launching!
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Broke the TA on the Dyno.. Well monday took my car to get dynoed and as soon as it started everything was going bad. First pull car blew out all of PS oil and no idea where it came from just know that the PS reservoir was bone On the 2nd or 3rd pull he went WOT top of fourth gear and BOOM!!
Tuner came out looking like he **** his pants. Parts went flying out from behind the car. Aftermath was broken tail housing on the stock t-56 tranny, broken ds along with u joints of course big ol hole by my back seats and a very unhappy me
. The car only put out about 335/340tq as he was tuning it. Have no idea what went wrong. Car is basically bolt ons and 4.11 gears with 100 shot of nitrous that wasnt even on the car when it blew. Any ideas on what went wrong better yet on how to prevent this from happening next time...? Car is lowered with eibach sportlines had a stock ds 10 bolt rear end w/ 4.11s has boxed LCA, bilstein hd shocks. Haven't taken it apart yet bt by what I can see the tailhousing and DS are toast for sure. Not too sure about rear end but the car does roll fine. Was basically thinking of throwing another DS and tranny and maybe this a safety loop and go at it again
but Idk i'm kinda sketchy on that approach.
Tuner came out looking like he **** his pants. Parts went flying out from behind the car. Aftermath was broken tail housing on the stock t-56 tranny, broken ds along with u joints of course big ol hole by my back seats and a very unhappy me. The car only put out about 335/340tq as he was tuning it. Have no idea what went wrong. Car is basically bolt ons and 4.11 gears with 100 shot of nitrous that wasnt even on the car when it blew. Any ideas on what went wrong better yet on how to prevent this from happening next time...? Car is lowered with eibach sportlines had a stock ds 10 bolt rear end w/ 4.11s has boxed LCA, bilstein hd shocks. Haven't taken it apart yet bt by what I can see the tailhousing and DS are toast for sure. Not too sure about rear end but the car does roll fine. Was basically thinking of throwing another DS and tranny and maybe this a safety loop and go at it again but Idk i'm kinda sketchy on that approach. 
08-04-2010, 03:01 PM
#2
sucks...been there done that
first time my car was on the dyno it broke the tailhousing 2nd pull, fixed that and went on my way
finally went back for a new tune and first WOT pull it looked like a grenade went off...chunks of transmission, driveshaft, u joint, smoke, and fire went everywhere...transmission was a built 4l60e with less than 3000 miles on it and it wrecked the clutches, band, seperator plate, pan, case was busted in 3 places...lots of other stuff...knocked a hole in the floor and destroyed my duals
also ruined the pinion yoke
got a new HD driveshaft custom made and high speed balanced and checked my drive line angles and went back...got the tune finished on 1 pull and I got the hell out of there
CHECK EVERYTHING before you go back:
high speed balanced driveshaft
transmission mount
transmission operating angle
seats of yoke
pinion angle (make sure they are strapping the car by the axle tube and not pulling down on the body which could roll the rear up and worsen pinion angle)
fine tooth comb...I hate dynos...
first time my car was on the dyno it broke the tailhousing 2nd pull, fixed that and went on my way
finally went back for a new tune and first WOT pull it looked like a grenade went off...chunks of transmission, driveshaft, u joint, smoke, and fire went everywhere...transmission was a built 4l60e with less than 3000 miles on it and it wrecked the clutches, band, seperator plate, pan, case was busted in 3 places...lots of other stuff...knocked a hole in the floor and destroyed my duals
also ruined the pinion yoke
got a new HD driveshaft custom made and high speed balanced and checked my drive line angles and went back...got the tune finished on 1 pull and I got the hell out of there
CHECK EVERYTHING before you go back:
high speed balanced driveshaft
transmission mount
transmission operating angle
seats of yoke
pinion angle (make sure they are strapping the car by the axle tube and not pulling down on the body which could roll the rear up and worsen pinion angle)
fine tooth comb...I hate dynos...
08-04-2010, 03:09 PM
#3
Launching!
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Well I'm kinda a newb to this so I don't know much about pinion angles and all that. I do have a Poly trans mount with stock motor mounts. What do you mean by seat of the yoke? Like I said I'm kinda newb at this but I just dont wanna go breaking stuff again.
08-04-2010, 03:13 PM
#4
where the caps sit in the yoke could be damaged allowing the driveshaft to move under the straps and cause vibration on the highway and such
I've never heard anything good about poly trans mounts especially with stock motor mounts but my car is a lot different than a fbody too so someone else should chime in on that
oh and worse yet after all that even with the new tune I only came away with a 345rwhp dyno sheet so I don't even get any cool bragging rights for the troubles haha
I've never heard anything good about poly trans mounts especially with stock motor mounts but my car is a lot different than a fbody too so someone else should chime in on that
oh and worse yet after all that even with the new tune I only came away with a 345rwhp dyno sheet so I don't even get any cool bragging rights for the troubles haha
08-04-2010, 03:16 PM
#5
was your driveshaft aluminum? if so it was probably bent...the stock fbody driveshafts are **** from what I've seen
friend broke his at the track on street tires, his stock replacement has a mild bend, and another friend with a camaro has one thats mildly bent
friend broke his at the track on street tires, his stock replacement has a mild bend, and another friend with a camaro has one thats mildly bent
08-04-2010, 04:54 PM
#6
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Had a couple break in customers cars... One was in a transplant Chevelle - rearend locked up for some reason and broke the yoke... driveshaft hit the tunnel so hard that the remote for the dyno that was sitting on the console went by my head at about 90mph and scared the livin $hit outta me! Sounded like a bomb went off. The other one, the driveshaft came out from under the car and almost took a guy working in the shop off his feet... and then missed a very expensive Viper by a couple inches... only twice out of the hundreds of cars I've tuned - doesn't happen often, but it does happen.
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08-05-2010, 12:01 AM
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Well I'm guessing I will go back to the rubber mount. and yes it was the stock aluminum drive shaft. I'm thinking about replacing with an aftermarket heavy duty driveshaft any opinions on that? I'm having a hard time finding the tailshaft housing anyone got any ideas on where to find one?
08-05-2010, 07:44 AM
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Not mentioned yet is the stock torque arm mounted to the transmission tailshaft.I was warned about broken tailshafts on the dyno by my tuner(Mikey at Rapidmotorsports) who saw it a couple times.When the car is strapped down on the dyno there is no give and a lot of stress up the torque arm.I got a crossmember mounted Spohn arm-wasn't sure I really needed it but with my luck I would have ended up like you.
08-05-2010, 09:20 AM
#11
Well I'm guessing I will go back to the rubber mount. and yes it was the stock aluminum drive shaft. I'm thinking about replacing with an aftermarket heavy duty driveshaft any opinions on that? I'm having a hard time finding the tailshaft housing anyone got any ideas on where to find one?
check the classifieds here too, if that doesn't work you might have to call a big transmission supply place like OTC but it will be more expensive
automatic ones are $20-60 used, not sure about a t56...
for a driveshaft you might call Bloomingthal's in OKC, I got a great deal on my huge *** 56" long 3" diameter thick wall chromoly for $230 shipped
08-05-2010, 11:39 AM
#12
What dyno?
Reason why I ask that you have dyno's that give a resistance to make measurements and maybe that was the reason. Simply the stock DS is nothing to write home about and has failed.
Just be happy it was not a C5 which is a whole different kettle of fish in terms of price to replace!!
Reason why I ask that you have dyno's that give a resistance to make measurements and maybe that was the reason. Simply the stock DS is nothing to write home about and has failed.
Just be happy it was not a C5 which is a whole different kettle of fish in terms of price to replace!!
08-06-2010, 02:19 AM
#14
wow man, that is crazy hope you get all that straightened out, would like you to put those gears to good use on the street. also with poly trans mount and rubber engine mounts, ive herad of guys cracking their bellhousings cuz one): the poly mount wont give hardly at all and 2): the stock engine mounts will so as the engine twists under torque the trans will stay put and crack. just get some solid motor mounts or polys and take advantage of the trans mount, will make for a more stable drivetrain.
08-07-2010, 07:37 AM
#19
Well known.. Repeated revs well past the critical speed of the shaft, will put unreal stresses on it. Stress will be concentrated at the middle of the shaft, resulting in whipping...adios!
