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Author Topic:   major help needed guys
ukandesperate
Dirt Full Roller

Total posts: 45
posted February 16, 2005 01:44 PM  
Right here goes, i run in the uk racing on a clay oval thats 440 yard,im building a car that should weigh in at around 1200lbs,with 260hp and 200lbft torque.we have to run a 7 inch wide tyre so really struggle for grip,can any of you guys recomend a rear end setup?? we usully run coilover shocks with 120lbs spring, two bottom links and one top link on top of the diff plus a panhard rod the full length of the axle... is there a better setup or could you give advice on link angles to give good traction off the line without suffering in the corners??? HELP!!!!

andykmod
Dirt Freak

Total posts: 351
posted February 16, 2005 01:59 PM  
www.moretraction.com It might help a tad bit.

ukandesperate
Dirt Full Roller

Total posts: 45
posted February 16, 2005 02:05 PM  
cheers !!!!

ukandesperate
Dirt Full Roller

Total posts: 45
posted February 16, 2005 02:11 PM  
Just had a look at the site,oops forgot to mention were not allowed any traction control system so it has to be pure mechanical grip,and as you guys seem pretty good at getting it thought you were the guys in the know! what link system would you guys recommend,ive seen pics of the top link being used with a damper?

zeroracing
Dirt Forum Champ
Total posts: 1875
posted February 16, 2005 02:12 PM  
4 link it!
get some bsb birdcages, float them, run 2 lowers and 2 uppers on each side, then a pull bar in the middle.

zeroracing
Dirt Forum Champ
Total posts: 1875
posted February 16, 2005 02:38 PM  
check your pm's

wfoondirt
Dirt Forum Champ
Total posts: 505
posted February 16, 2005 04:12 PM  
Cool cars,any pictures? With a 1200lbs/ 260hp car and 7" tire you shouldn't have too much traction problems unless the tire are super hard.

What kind of corner weight percentages do you run.

Unless you are severely rear weight limited I would shy away from the extreme setups that are used around here. You will give up too much corner speed and consistancy. On a lower power to weight ratio car like your you can't make up for the pitfalls of a 4link with shear horsepower like most of the mods around here do. You need to tune to maximize momentum and corner speed, not for forward bite.

Have you run the car in its current configuration? If so are there any particular complaints? What are your current bar angles. Do you run a housed axle like a road car or an open axle like a go-cart? If its an open axle the bar angles won't do much for forward bite.

Unless you have a way low motion ratio 120lbs springs seem pretty stiff for the rear. Do you run the same spring in the lr and rr.

Its really hard to give educated advice without alot of detail about your car. The mods around here weight 2450 and are around 600-700 hp.

[This message has been edited by wfoondirt (edited February 16, 2005).]

ukandesperate
Dirt Full Roller

Total posts: 45
posted February 16, 2005 04:30 PM  
cheers for the replys,yes we have run the same sort of cars before,its purely off the line that causes a problem,too big a gear and it stalls,too low and i lights up,corner speed seems good. if over a hundred yard sprint to the first corner i can gain half a car length that would be enough.ive always run the top link an inch lower on chassis than car and bottom links an inch raised towards the front,i see you boys spread your link rods the other way,wider on the axle ?

ukandesperate
Dirt Full Roller

Total posts: 45
posted February 16, 2005 04:33 PM  
that should have said wider on the chassis!

wfoondirt
Dirt Forum Champ
Total posts: 505
posted February 17, 2005 09:36 AM  
So you start from a stand still??

ukandesperate
Dirt Full Roller

Total posts: 45
posted February 17, 2005 11:03 AM  
Yes its a standing start,prob about hundred and ten yards to the first corner,so its critical to get a good start as the tracks are very tight and not much time to pass in only 5 laps,is two links a good idea with a pull bar,what spring rate would you guys suggest?


AtomicPunk
Dirt Maniac

Total posts: 130
posted February 18, 2005 12:56 PM  
U.K. is there a web site where we can check out this type of racing? This is new and strange to us yankees. If we understood it better we couold probably give better advice.

ukandesperate
Dirt Full Roller

Total posts: 45
posted February 19, 2005 09:48 AM  



 
heres a few pics to give you an idea,the class i run in is unlimited engine mods but has to be normaly aspirated,and the shell has to remain as standard other than linking positions,the other pics are specials with twin bike engines in the back.
at the mo im running a two litre vauxhall16v its 260hp and 180lbft,but have run ford pinto 2.4 8v that was 240hp 210 torque,the vauxhall is quicker tho?

ukandesperate
Dirt Full Roller

Total posts: 45
posted February 19, 2005 09:51 AM  
heres one site with a few pics,ignore the minis they are a nightmare and painfull to see,unmodified 1 litre,we have good racing and some seriously **** stuff too!!!!
the tracks are 440 yards oval with tight bends,we hit about 80mph at the end of the straight

ukandesperate
Dirt Full Roller

Total posts: 45
posted February 19, 2005 10:02 AM  
heres a site,not many good sites to show you tho http://www.concordautograss.co.uk

donslink1
Dirt Freak

Total posts: 318
posted February 19, 2005 10:06 AM  
your going the wrong way!!!!

ukandesperate
Dirt Full Roller

Total posts: 45
posted February 19, 2005 10:45 AM  
ha ha thats why it dont handle!!!
well you guys drive on the wrong side,its only right you race backwards too!
and yes we have raced big v8 motors but they dont seem to work on our tracks,too much torque maybe,200 lbft seems about the max,thats why were desperate to get more rear end grip

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