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the damage thread

88lx5oh

By 88lx5oh,
in Passing Lane

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88lx5oh Newbie

88lx5oh

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some were there, some heard about it, but figured id make a thread

 

last weekend was the first time i got to get the car at the track.

little break down on the mods.

Procharger HO kit with D1SC, 12psi at 7200

car made 631 RWHP and 526RWTQ on 93

SW long tubes and MBRP Race

DSS aluminum driveshaft

DSS 1400 half shafts

McLeod RST clutch

MGW shifter

BMR delrin cradle bushings

BMR poly diff bushings

Viking shocks

Eibach Pro Kit springs

race star 17" rear wheels with M&H race master drag radials

its a PP car so 3.73 gears

 

best pass of the day was 11.33 @ 126 with a 2.0 60'

 

 

then the bad part came.

in line to make another pass, pulled into the water box, then proceeded to do my burnout, tires started spinning then went into massive wheel hop as one of the staff guys was yelling at me to shut the car down. so i did. then they brought a bolt up to me that came out of the car. asked me what it was. after seeing it i knew exactly what it was. a diff bolt.

 

i got the car out of the lanes, and got it on the trailer to get a better look.

 

the rear bolts that hold the diff to the IRS cradle sheared off, which are 10.9 grade bolts, the front bolts bent. this caused the rear of the diff to sag ALOT. pitching the front of the diff upward, causing the driveshaft to ride high in the back, high enough that the driveshaft ended up getting 2 grooves wore in it from some bracing that is in the rear part of the tunnel. having the diff in the position it was also caused the halfshafts to ride on the IRS cradle, cutting through the inner boots and causing damage to the inner joints.

 

im unsure of other damage at this point, since i have not been able to get the car torn apart. I'm expecting there to be some internal damage to the diff, but i won't know until i get it out of the car.

 

i contacted kelly at BMR, said he's seen front bolts shear but never rear bolts. Moving forward ill be installing the aluminum diff bushings which kelly recommended, which i will enlarge the hole in to accommodate 2mm larger diameter bolts, which will be 12.9 grade. i will also have to enlarge the ears of the diff to accommodate this as well. this is after i remove the rest of the bolts that are still in the rear ears of the diff. if the differential has any damage i will be swapping to 3.31 gears, since even with a 28" tall tire i was still having to shift into 5th before the traps.

 

i also contacted DSS to find out what can be done with my driveshaft and half shafts. ill be sending those back to DSS, and they are gonna retube, and check over the rest of the driveshaft and rebalance it. the half shafts damage are fully unknown at this point because again i haven't gotten a chance to get them out of the car yet, but they are going to inspect them and fix what needs to be fixed.

 

hoping the damage is limited to those items and i can get everything repaired and back in the car quickly. until then i might have to roll around on the stock DS and halfshafts until they are repaired.

 

it was a somewhat disappointing day, as i was hoping to come away with a 10 sec pass, but i just didn't have the grip to support it. and end of the day i had a part failure that caused a lot of other parts to get damaged.

 

here are some pics of the damage.

 

the diff and mounting points/bushings in the rear

http://i.imgur.com/ia0iqgHl.jpg

http://i1101.photobucket.com/albums/g425/hobglide/Mobile%20Uploads/8FAED004-1634-4A68-A6B1-1D808BF4BDD6_zpseppsbyyt.jpg

 

half shafts laying on the cradle

http://i1101.photobucket.com/albums/g425/hobglide/Mobile%20Uploads/0DC88387-282B-4F73-92AF-574D0340516B_zpsz4hgagmp.jpg

http://i1101.photobucket.com/albums/g425/hobglide/Mobile%20Uploads/A8A8BC10-EE25-4C75-A5BE-6FA992711973_zpsa8op9yd9.jpg

 

grooves in the DS

http://i.imgur.com/3gtEN2Ol.jpg

 

diff dropped so much it dented the exhaust

http://i1101.photobucket.com/albums/g425/hobglide/Mobile%20Uploads/1DA36BFE-7E7D-4204-ABAE-0269F45009EA_zpsux8zhngt.jpg

 

a pic of one of the front bolts for the diff, you can see how bent it is, and its not flush with the bushing

http://i1101.photobucket.com/albums/g425/hobglide/Mobile%20Uploads/A1990CF7-A26A-421E-8BB0-364BD1FE2D59_zpskkzmt3sp.jpg

 

one of the culprit bolts, the other one i couldn't get out because it was hitting the spare tire relief

http://i.imgur.com/JrNGhrbl.jpg

http://i1101.photobucket.com/albums/g425/hobglide/Mobile%20Uploads/9D27DD8A-25BA-4C6E-AFE3-0D6F5330E23F_zpsvjevoigs.jpg

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Aaron Newbie

Aaron

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i will also have to enlarge the ears of the diff to accommodate this as well.

 

i will be swapping to 3.31 gears, since even with a 28" tall tire i was still having to shift into 5th before the traps.

 

I can't see the pictures, but if you're talking about the differential mounting points, I would be careful. I've seen a few big power guys break the "ears" off the diffs...

 

Also, depending on calculations for tires, 3.55 might be better?

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99StockGT Newbie

99StockGT

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Sorry to see it go this way especially after all the time energy and money you have wrapped up in it. Amazing what damage a single bolt snapping can do. Are you able to easily swap back to stock parts? Haven't "passed the point of no return"?
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Miller Newbie

Miller

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From a water box too....? Ouch. Crazy the amount of torque going through that stuff. Sucks all that happened.

 

He had already hot lapped most of the day. I assume it was already bent several times from bouncing all morning and just needed one more nudge.

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Guest GMoney

Guest GMoney

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The bolt diameter looks small for a bolt that long on a shear load through a bushing like that.

 

I would go the next bolt size up and 12.9 grade. The size up will be the tricky part.

 

What about making a girdle that grabs the bottom diff cover bolts to keep it from swinging up and down?

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88lx5oh Newbie

88lx5oh

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The bolt diameter looks small for a bolt that long on a shear load through a bushing like that.

 

I would go the next bolt size up and 12.9 grade. The size up will be the tricky part.

 

What about making a girdle that grabs the bottom diff cover bolts to keep it from swinging up and down?

 

everything you said is what i have planned

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88lx5oh Newbie

88lx5oh

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let me know when you pull it apart ill call frank and have him hook you up on reparing all the DSS stuff, also let me know whatever else you need!

 

 

P.S. I have some stuff for you to powder coat

 

will do, i might have you guys ship the stuff out to them since you probably have an account with UPS.

 

ill be needing a 3.31 gear set for 8.8 its and and install kit

 

 

get ahold of me on the powder coating

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  • 2 months later...

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