Circut car Corner Weights

RodPenrose · 2009-11-14T22:32:18+00:00

I have purchased a set of digital scales and am adjusting the corner balance on my circut car and need some technical info to help me with the set-up . Can someone that has some experience in this help me with some info or point me in the right direction . I have set the car on the scales and the total weight is 749 kg's . I have scaled it as it came off the track at Wakefield park , and than adjusted it to what I feel is good . I have all 4 corners independantly adjustable and can get an even amount of weight on each corner . The problem is that the car looks all twisted and bent . I have gone the other way now and set the ride height to where I want it and now the corner weights are now all unevan . I have 100 kg's of weight in the drivers seat and am now moving such things as the battery to different positions in the car to even up the weights . I have ended up with 48% of the total weight on the left side and 52% on the right . I now also have 37% of the total weight on the front wheels and 63% on the rear . I am happy with what I have done for now but dont know if it is the corect way of doing it . I am back at Wakefield park on the 6th of December and if it handles like a bag of shit I know what I can adjust to transfer more weight to another part of the car . Some experienced help would be good , thanks ROD.

dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 · 23 Mar 2010, 5:36 am

#769306

Some interesting reading here related to Volksies.
Drag racing, but still relevent.(page 11)

http://ultimateaircooled.com/simplemachinesforum/index.php?topic=6102.150

westi wrote:That's mad Alan.

RodPenrose Insano Dub Head

792 posts · joined Apr 2005 · 18 Apr 2010, 12:26 pm

#773754

Dave , thanks for the link . Some of the theories seem good and some sound like they are full of shit . It is always good to look at doing things in a different direction than what I would normally go in , ROD.

More boost + More fuel = More power
1968 Beetle fastest run 8.96 sec @ 161 mph 4th Nov. 2001
2010 New Beetle 8.12 sec on 8th march 2014
http://www.rodpenroseracing.com.au

RodPenrose Insano Dub Head

792 posts · joined Apr 2005 · 20 Apr 2010, 7:11 pm

#774147

Well , after killing another engine due to a lack of lubrication I have rebuilt it again . I disassembled the old 2276cc engine and found a really shitty conrod bearing and the other 3 were pretty well stuffed as well . The conrod was a throw away item and the crank needed to be ground on the mains and rods . I cannot find a major problem with the oiling system , but I did find a few things that I did not like in the pick-up area and the oil pump is now in the bin .
I have now rebuilt the engine with a new 84mm crank and new set of rods . The engine is now 2332cc and the compression has gone from 10.3 to 10.7 . I had a dyno session last Saturday and now the engine output has gone from 121.2 hp to 143.8 hp and the torque has also increased from 223.8 ft/lbs to 263.9 ft/lbs . These are readings are on a chassis dyno and are @ the wheels . Engine hp is now a stout 186 . I still have the 37mm venturies in it and did try the 42mm units and the power was up to 148 and the torque was 270.2. With the larger venturies the max power was @ 5354 rpm and held it to 5929 rpm . The max torque is now @ 5044 rpm . I will be using the smaller venturies as the torque curve is a lot better for what I want to do . I will now have a test day @ Wakefield park next Monday on the public holiday and try to kill this one , ROD.

More boost + More fuel = More power
1968 Beetle fastest run 8.96 sec @ 161 mph 4th Nov. 2001
2010 New Beetle 8.12 sec on 8th march 2014
http://www.rodpenroseracing.com.au

whathaveidone Custom Title Time!

1,559 posts · joined Feb 2010 · 20 Apr 2010, 7:24 pm

#774148

will be in goulburn will try to drop in

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 · 20 Apr 2010, 7:28 pm

#774149

what size pump now Rod?..........not interested in the ole hellbug theory of less volume and quicker returning to the pick up?

RodPenrose Insano Dub Head

792 posts · joined Apr 2005 · 23 Apr 2010, 9:17 am

#774654

Damo , I was using one of the CB performance in/out oil pump and was supprised to see that it was 34mm wide . I have now gone for a melling steel 29mm pump and a convential full flow deal by returning the oil into the gallery . I now have 80psi of pressure when I first start it , and 140 psi at 7000 rpm . I am now using the ACE syn-x 4 oil . This is a 5-40 full synthetic deal with 6 litres of oil capacity , ROD.

More boost + More fuel = More power
1968 Beetle fastest run 8.96 sec @ 161 mph 4th Nov. 2001
2010 New Beetle 8.12 sec on 8th march 2014
http://www.rodpenroseracing.com.au

bigrudi Wolfsburg Wizard

401 posts · joined Apr 2005 · 24 Apr 2010, 6:18 pm

#774875

GEEZE Rod thats a shit load of oil pressure better take some spare oil filters concrete and a broome , ur also not supposed to be using synthetic oil they cant clean it up, why so much pressure ? good luck with it cheers Rudi

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 24 Apr 2010, 9:01 pm

#774912

will be interesting to read this thread on Monday night 😀

RodPenrose Insano Dub Head

792 posts · joined Apr 2005 · 29 Apr 2010, 3:48 pm

#775689

Well , after a long day on Monday the engine is still together . I was too lazy to swap back to the smaller venturies , so I left the larger 42mm units in . The power and torque of the engine is increadible . I am using 4th gear all the way , and only use 3rd to help get into 3 of the corners . I am doing 142km/h on the 7000 limiter before the start line on the straight . I turned probably 40 + laps and would make a change to the car on every session . I must say a big thanks to Greg Mackie for his help and knowledge and am now looking forward to the nationals in 3 weeks time . I did not get any lap times , but I have actually passed a car for the first time . I actually passed a car on almost every lap and feel more confident in the car . It still amazes me on how hard you can drive a car around a corner and it will do what you want it to . The oil pressure seems to be good at around 10-12 psi per 1000 rpm's when hot and after a 12-13 lap stint the temps are all good . I will now give the car another wheel alignment and put it back on the corner scales and make any necessary adjustments . I have gone from tyre temps in the 75 degree range to 130 now , and the brakes are now opperating in the 340 degree range instead of the 200 degree last time , ROD .

More boost + More fuel = More power
1968 Beetle fastest run 8.96 sec @ 161 mph 4th Nov. 2001
2010 New Beetle 8.12 sec on 8th march 2014
http://www.rodpenroseracing.com.au

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 · 29 Apr 2010, 4:24 pm

#775693

nice
Taller 4th on the cards now?...i cant remember how far from the braking area the start line is?

PAZZAN Wolfsburg Wizard

592 posts · joined Jan 2008 · 29 Apr 2010, 5:16 pm

#775702

I was hitting the limiter 7500 in third just at the end of the straight at the first kink not sure what kph that was..???