stillracin Posted October 17, 2004 Posted October 17, 2004 It was raining in North Yorkshire today. I was bored, had just fitted my new lightweight discs and wondered what the corner weights of my BUSA were. Down came the bathroom scales, and with the help of my 5 yr old we wasted 15 mins jacking up and measuring each corner. I was a touch disappointed. they were: N/S Fr 161Kg Fair one as the Busa engine cants to the left. O/S Fr 144Kg N/S Rr 160Kg O/S Rr 153Kg with qtr tank of fuel etc. The car is relatively light ie aeroscreen (but has a heater - soon to be removed), comfy seats (race seats on shopping list) other than that no luxuries. Can the car really be this heavy, am I being daft, or should I leave the poor bathroom scales alone and get the job done properly? Quote
neilb Posted October 17, 2004 Posted October 17, 2004 618kg for a megabusa - makes my 575kg ex-x-flow powered car look very very very very light just wait 'til the new light engine is in then it will be down to 520kg Quote
Terry Everall Posted October 17, 2004 Posted October 17, 2004 It aint that simple !!!! If you measure one wheel at a time then due to chassis stiffness you will pick up either extra front or rear weight. Same as jacking up one part of front or rear chassis. Result - it all lifts up !! Try 4 bathroom scales Quote
DavidR Posted October 17, 2004 Posted October 17, 2004 I think the answer is in the method, you didn;t weigh the corners of the car as it is on the road. You weighed them with the corner jacked up thus changing the weight resting on the other wheels. You have a set of readings but the weight of each wheel when all are resting on the ground is shared according to gravity. On your method you altered the corner weights by jacking up to get the scales under neath. I think you need to use 4 sets of scales to be more accurate. Don't be disheartened, you might still be as light as you hope when you masure it with a more accurate method. David. Quote
Mark Stanton Posted October 17, 2004 Posted October 17, 2004 Bathroom scales I think there's a lot of folks tried that one on a cold boring sunday arvo, not quite the way to do things as you'll need 4 proper scales on a totally level floor What target weight are you looking for Lightweight hubs, 13" wheels, trim absolutely everything - even lightweight rivets, use of carbon in lieu of ali panels if you're going for all out lightweight. Good Luck Quote
scruffythefirst Posted October 17, 2004 Posted October 17, 2004 I think you need to use 4 sets of scales to be more accurate. Or 1 set of scales and 3 bits of wood which have the correct thickness Quote
Nick Algar - Competition Secretary Posted October 17, 2004 Posted October 17, 2004 You should be around the 500Kg mark. Quote
oldman Posted October 17, 2004 Posted October 17, 2004 Bathroom Scales?Every woman in the country knows that they have been the biggest lying barstewards since they were invented Quote
stillracin Posted October 17, 2004 Author Posted October 17, 2004 Thanks chaps, Bathroom scales now back in the bathroom. Time to remove the heater, swap the seats and find a more scientific method of dealing with this problem. That said, my 5 yr old and I had fun on a wet N Yorks Sunday - so all was not lost. To be honest though, I am not sure the 5 yr old new what his daft dad was up to!! Quote
Bananaman Posted October 18, 2004 Posted October 18, 2004 Why not take it to some where like Transpower.............. & get a full setup, corner weights, ride height, toe in/out, camber..................... Remember , if your setting up your car you'll need to do it with you in it or the eqivelent weight in the car. Front weight balence is the one to get right the rear is less important. Quote
mrblondie Posted October 18, 2004 Posted October 18, 2004 Hi i did my busa a few weeks ago, and bought a couple of cheeap dig scales from argos and proped the other 2 wheels with a couple of bit of wood the same height so all wheels sat even on the "floor" the fronts eventually ballanced out at 115kgs each but cant rem the back..... was a pain to do but well worth the effort car def feels better for it Quote
Rob Navin Posted October 18, 2004 Posted October 18, 2004 Why not take it to some where like Transpower.............. & get a full setup, corner weights, ride height, toe in/out, camber..................... Remember , if your setting up your car you'll need to do it with you in it or the eqivelent weight in the car. Front weight balence is the one to get right the rear is less important. Andy That sounds like another satisfied customer to me. I would also strongly suggest a trip to Tranzpower in Chesterfield. The way that Trev sets a car up is superb. Rob Quote
Bananaman Posted October 18, 2004 Posted October 18, 2004 Left Front: 139.5 kg Right Front: 140 kg Left Rear: 160 kg Right Rear: 188.5 kg It looks like the balence front to rear is the same, which is excelent as it was set up without knowing the previous F2R characteristics (these were pretty good B4). Got 1.5 deg neg camber front & 0.5 at the rear. Total of 1mm toe in at front & 3mm toe in at rear. Ride height of 84mm F & 93mm R. Could do with a test day now to have a play....... BIG for Trev & co. Quote
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