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-   -   Transmission kick under accel (https://www.ft86club.com/forums/showthread.php?t=60944)

SCharged 03-17-2014 02:52 PM
Transmission kick under accel
 
Anyone experiencing transmission knocking under wheel spin off a start?? I get the usual shifter shake, but also some ''dry'' knocking of the tranny underneath..

anyone else?? fixes?? tranny support/mount maybe?

Thanks :thanks::thanks:

7thgear 03-17-2014 03:08 PM
auto or manual?

SCharged 03-17-2014 03:23 PM
Sorry, should've specified... it's manual

Travisty75 03-17-2014 03:38 PM
Quote:
Originally Posted by SCharged (Post 1605659)
Anyone experiencing transmission knocking under wheel spin off a start?? I get the usual shifter shake, but also some ''dry'' knocking of the tranny underneath..

anyone else?? fixes?? tranny support/mount maybe?

Thanks :thanks::thanks:
If it's what I and a couple others have experienced then it's actually "wheel hop." I say that because I'm not sure the wheels are actually hopping, but that's what it feels like. If you watch some Whiteline videos on YouTube the entire rear subframe of the car moves an incredible amount. What I think actually happens is that the whole system moves, binds/unloads the wheels, then wheels stop spinning/system moves again.

Based on my hunch, I've bought diff outrigger bushings, diff mount bushings, and subframe bushing inserts. I'm hoping that's enough to keep everything where it should be.

SCharged 03-17-2014 04:23 PM
Quote:
Originally Posted by Travisty75 (Post 1605853)
If it's what I and a couple others have experienced then it's actually "wheel hop." I say that because I'm not sure the wheels are actually hopping, but that's what it feels like. If you watch some Whiteline videos on YouTube the entire rear subframe of the car moves an incredible amount. What I think actually happens is that the whole system moves, binds/unloads the wheels, then wheels stop spinning/system moves again.

Based on my hunch, I've bought diff outrigger bushings, diff mount bushings, and subframe bushing inserts. I'm hoping that's enough to keep everything where it should be.
Makes sense.. Although I 've had this on the wet too.. I've never seen wheel hop on wet i think..

Travisty75 03-17-2014 05:51 PM
Quote:
Originally Posted by SCharged (Post 1605986)
Makes sense.. Although I 've had this on the wet too.. I've never seen wheel hop on wet i think..
I've experienced it in wet and dry. Dry was under spirited acceleration at the start of an AutoX, wet happened leaving stop lights with a bit if a clutch side-step.

Guff 03-17-2014 05:57 PM
Yup, it's wheel hop. It's pretty intermittent in our cars and it really isn't too bad compared to some other cars I've launched in. Like@Travisty75 said, there's a few things you can get to alleviate it, but it's really just something you gotta live with when you have IRS.

GotMunchies? 03-17-2014 05:59 PM
This is likely wheep hop if it felt like a juddering from the rear end with vertical vibrations. Its a common issue with RWD cars with many different types of suspension set ups. I get it in my Mustang with a stick axle - its worse in the wet. Older CTS-V's could axle hop so badly they would blow up differentials. Fixes range from driving adjustments to adjusting suspension geometry.

SCharged 03-18-2014 10:53 AM
Thanks for input everyone. I'm kind of relieved... will still keep an eye open and update thread if it ends up being something that may be of interest to the community.

OrbitalEllipses 03-18-2014 11:09 AM
There are mounting points you can stiffen to prevent slop (engine mounts, trans mount, rear diff mount, rear subframe inserts, 1pc driveshaft) and minimize wheel hop, but as others have said it's the nature of the beast.

Mikem53 03-18-2014 12:20 PM
Quote:
Originally Posted by OrbitalEllipses (Post 1607927)
There are mounting points you can stiffen to prevent slop (engine mounts, trans mount, rear diff mount, rear subframe inserts, 1pc driveshaft) and minimize wheel hop, but as others have said it's the nature of the beast.
How is this car with wheel hop..? My old age mentally prevents me from doing too many abusive launches.. My last car was a C6 vette, I had terrible wheel hop issues.. I aliveiated most of the wheel hop issues by replacing the stock GY Runflats with some non-runflat pilot sports.
IRS set ups aren't good for abrupt hard burnouts. At least in my experiences..

OrbitalEllipses 03-18-2014 12:24 PM
Quote:
Originally Posted by Mikem53 (Post 1608089)
How is this car with wheel hop..? My old age mentally prevents me from doing too many abusive launches.. My last car was a C6 vette, I had terrible wheel hop issues.. I aliveiated most of the wheel hop issues by replacing the stock GY Runflats with some non-runflat pilot sports.
IRS set ups aren't good for abrupt hard burnouts. At least in my experiences..
I haven't addressed it, but this thread might have good information: http://www.ft86club.com/forums/showthread.php?t=29020

Short search link (LMGTFY, forgive me): http://bit.ly/1ooDBaL


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