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Go Back   TDIClub Forums > VW TDI Discussion Areas > Upgrades (non TDI Engine related)

Upgrades (non TDI Engine related) The place of handling, lighting and other upgrades that do not relate to the performance or economy of the TDI engine. In other words upgrades to your TDI that don't fit into TDI Fuel Economy & TDI Engine Enhancements.Please note the Performance Disclaimer

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Old March 14th, 2017, 12:42   #1
CNGVW
 
Join Date: Sep 2009
Location: Bob Mann Auto, 111 High St, Pembroke MA 02359
Fuel Economy: Built a 2002 TDI Jetta that got 120 mpg of diesel using a CNG blend.
Default Roll center on DRVOLKS.com Chump/Lemon Beetle

OK I had a snow day today and had time to test my Beetle Chump/Lemon roadracer Beetle/

So the car is one of the fastest TDI Beetles around .
Below is Roll Center software used to find it on any car and what to do to get it right.

My car as it sits my rollcenter is on the top of the pavement far from the best place. The lower the car gos the worse it gets it is below the ground 2 inchs for every one inch of downward movement. I run my car high in the front to help it handle with the setup we have hear.
The only place with this front end to get it right is to move the ball joint and the inner a frame pivots, but I need to drop the front end to to lower the center of gravity of the car too.
So now the hard part we will need to relocate the a frame inner pivots after we lower the car 2 inches . Then build lower ball joints with a 1.5 inch longer stem.
The sweet spot is 3 inch above the ground at race ready and as the car dives under braking and turn in the turn to keep the roll-center above ground.
It would be best to have it not move but with the car VW design your will never get there.
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Bob Mann
www.DRVOLKS.com
bobtec@comcast.net

VW and Audi Master Technician and TDI Specialist. Bob has over 35 years of experience in the field, and is listed on TDIclub.com as a trusted TDI Mechanic.
Bob is also known for his CNG conversions and is a consultant for Patrick Racing.
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Old March 14th, 2017, 12:47   #2
GoFaster
Moderator at Large
 
Join Date: Jun 1999
Location: Brampton, Ontario, Canada
Default

Oh fun.

You'll have to play around with the steering rack location to address bump steer, too.

Why are the L and R RCH different even though (unless I'm blind) all the input dimensions are the same?
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Brian P.
formerly ... 2006 Jetta TDI 5-sp, Spice Red, Unitronics stage 1, 0.681 5th gear.
and before that ... 1996 Passat TDI, Silk Blue
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Old March 14th, 2017, 13:45   #3
CNGVW
 
Join Date: Sep 2009
Location: Bob Mann Auto, 111 High St, Pembroke MA 02359
Fuel Economy: Built a 2002 TDI Jetta that got 120 mpg of diesel using a CNG blend.
Default

I did a post on that last year have the bump steer plate on hand for later .
I may have loaded a number and did not refresh??
__________________
Bob Mann
www.DRVOLKS.com
bobtec@comcast.net

VW and Audi Master Technician and TDI Specialist. Bob has over 35 years of experience in the field, and is listed on TDIclub.com as a trusted TDI Mechanic.
Bob is also known for his CNG conversions and is a consultant for Patrick Racing.
CNGVW is offline   Reply With Quote
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