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TDI Motorsports This section is dedicated to the folks who push the TDI to the absolute limit racing. Topics should include articles about TDIs in the SCCA ProRally Series, Drag Racing, AutoCross and any other events that include TDIs.

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Old July 10th, 2017, 18:07   #76
TheFawkingHux
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Join Date: Feb 2017
Location: Connecticut
TDI(s): Mk3 Golf CL
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Front control arms parallel to ground is a must.

Rear beam is fine, seemed to do perfectly fine for the racing Minis for the past 50 years.
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Old July 10th, 2017, 19:40   #77
3L3M3NT
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Quote:
Originally Posted by shepner View Post
That's an idea...How much worry is there about the bolts breaking? Are you suggesting no sway bars at all?
stephen
He's suggesting that you disconnect your front sway bar to see how the car handles without it. If you like how it handles keep it that way and if you don't like how it handles, just reconnect the sway bar.
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Old July 11th, 2017, 05:25   #78
CNGVW
 
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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.
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OK I will share with you what years of real racing we have learned to work on the DRVOLKS.com Beetle .
Below is the car with many round of testing and retesting an make up the parts as we go.the roll center as it is now!

to get it to this point one of the biggies add on was the tall lower ball joint

I am working with other Chump VW teams to test what I have found to work.
below is the work that had to be done to get the roll center to work. and my drivers are all real race car drivers not want to be,s so the feed back on it from all drivers at WG is is was the best handling car they had ever driven!!!
Ok I would gladly help
The ball joints are from Speedway parts but the screw tube bottoms to weld on your lower A frames
make shore you check your camber and the axle because you can pull the axles out of the inner cup.
Buy the reamer that matches the taper .
You must mock up the rotor and hub tight and machine the lower ball joint hole off center so that the ball joint screw tube dos not hit the rotor. and recheck after you are done with no springs to make shore the ball joint do not hit the rotors as the swing up/down
How I did it was take the spindle mount it in the brige port with the old ball jount hole at the top and the top of the spindle that the strut gos through is pulled tight to the table the angle was just about right. You may need to shim and use a end mill to punch it off center a bit. it will not follow the stock hole angle . start small and use the reamer with a hand drill so just the bottom thread is below the finished hand grinded part after I was done I had to hand grind the part where the nut pulled down to clear the nut and at a 90deg to the ball joint and cut the top of the ball joint sticking up from hitting the CV joint
I used TT lower control arms forged .
If you give me all the measurement as in the rollcenter jpg i will do the math for you. or just buy his program
I had to cut off 1 inch of the top of the sub frame too this point was 40 HR
I run no sway bars
Then you will need to do bump steering fix after all this work read up on that
What I had to do 19 hr later is cut the bottom of the rack 3/8 and cut the tie rod end off the spindles and swap left for right and weld them up 5/8 of a inch up.
below is the car with is new rubber 275/40/17 on 9.75 rims all corners

This is as I know the biggies tire ever put on a VW plate form like mine that really races and it worked.
Bob Mann
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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 July 12th, 2017, 13:55   #79
shepner
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Location: Milwaukee, WI
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Good stuff! Thanks everyone. Lots to dig through and try. Taking an earlier cue, I ordered a ball joint to play with which I need to pick up tonight.

>275/40/17 on 9.75 rims all corners
and you can still turn the wheel?

While Im not intending to go anywhere that extreme with this car but I would like to be able to know how to determine this stuff for myself for when I finally can have a dedicated race car. Which software package is that for the suspension? I know that there are several out there. Any real pros/cons to any of them? For stuff like spring rate, are you measuring that or is there someplace that you can look it up? Related, does VW actually publish stuff like that anywhere? It doesnt seem to be in the shop manuals. Gear ratios are another one I was looking for and couldnt find. I kinda miss that from the old Bentley manuals.

stephen
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Old Today, 09:28   #80
Tikra
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Join Date: Jul 2017
Location: Holland
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Guts - is there anyone out here to help me with my polo setup?
I can hear you saying "POLO"? Yes, we planted an AFN 1997 tdi into our 11/1997 Polo 6N1open air (slightly 850 kilo heavy). Todays setup is 143 hp with original injectors and original turbo which speed us up within seconds above 205 km/h - with power left but to high in rpm and causing fast increase of temperature.
We use the original 02A CYP transmission.
The future looks like:
Different map sensor, 200hp, race520 nozzles from fratelli bosio (it), turbo either from the audi 2.5 or kkk04.
Still will keep us with the 5th gear....
Advices are welcome:
Configure my own transmission fitting in the 02A housing? What do you suggest? Only 5th gear exchangement? I have 4 mm left in the motorcompartimment so expansion to 6th gear is no possibility....
Brakes actual G60 front ... polo gti back.
Suspension to be considerd (any suggestions for street and weekend track setup?)
Cheers and thank you guys for helping us out....
Helge

Last edited by Tikra; Today at 09:31.
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