Mike Rohaley Posted September 25, 2006 Share Posted September 25, 2006 What is the weight of your car (truely ready for the road, all fluids and full tank)? Also, what specifications (such as engine type, wheels and tires, CF parts). I have heard weights from high 1100's to high 1200's for a traditional chassis and nearly 1500 for an SV chassis. Just curious, I will get mine weighed sometime soon here and add it to the list. Link to comment Share on other sites More sharing options...
slngsht Posted September 25, 2006 Share Posted September 25, 2006 We should probably compare cars with all fluids, but empty gas tank, or full gas tank - (tank capacity * 8 lbs), so a car with a big tank does not get penalized. (Note: I *think* gas is 8 lbs/gallon, but I'm not sure) My Rotus was 1670 lbs when I got her after the engine conversion. Since then she has lost some weight (I got rid of the steel gas tank, and some unnecessary engine components). She's about to lose some more weight when I go to cycle fenders. After that, I'll weigh her again. I'm hoping to get into the 15xx range - still pretty heavy. Link to comment Share on other sites More sharing options...
slngsht Posted September 25, 2006 Share Posted September 25, 2006 Also, we should subtract the spare tire, since alot of guys run without them. Link to comment Share on other sites More sharing options...
Mike Rohaley Posted September 25, 2006 Author Share Posted September 25, 2006 That is part of the specification section, if you run your car without a spare or without a windscreen disclose it as such. Since you cannot run a car without gas we should assume full tanks or at least disclose how much was in the car at the time of scaling. We always used 7.5 lbs/per gallon when we scaled our karts. Link to comment Share on other sites More sharing options...
xflow7 Posted September 25, 2006 Share Posted September 25, 2006 Caterham Classic Clamshell fenders 1700 Crossflow (wet sump) Type 9 'box 4-1 side exhaust Std. (i.e. not alu) Radiator Std. Rollbar Windscreen No heater 13" Minitors w/ 185-70R13 Michelin MXV (or something) and spare Bench seats no floor/tunnel carpets Weather gear ~1/4-1/3 tank of gas 1150 lbs. weighed one end at a time on 4 bathroom scales FWIW, the shockingly heavy bits: Spare wheel/tire = 28.6 lbs Bench Seats (2 bottoms + back) = 22 lbs. Edited to say, aluminum is polished; i.e. none of that pesky, massive paint. http://www.usa7s.com/aspnetforum/images/emoticons/biggrin5.gifxflow72006-09-25 18:44:21 Link to comment Share on other sites More sharing options...
stevet Posted September 26, 2006 Share Posted September 26, 2006 The shockingly heavy bit in mine is usually me http://www.usa7s.com/aspnetforum/images/emoticons/thumbsup.gif Link to comment Share on other sites More sharing options...
powderbrake Posted September 26, 2006 Share Posted September 26, 2006 My 2004 WCM Ultralite was 1420 pounds, with about 8 gallons of gas. I went to a truck scale, and that was what it read. This is about 100 lbs over the advertised weight. I don't have a lot of faith in the truck scale reading accurately at that level, as it normally reads over 40,000 pounds, and likely has a rating of twice that. That means my measurement was within 1 1/2 % of the capacity. Likely the friction in the scales is a significant number relative to the cars weight. I am going to Run N Gun in October, and they will have a corner weighting seminar, so I plan to get a better reading at that time. Regarding density of gasoline: Water = 62.4 lb/ cubic ft or 1000kg/cubic meter Gasoline = 737.22 lb/cubic meter so gas is 73.7 % of the weight of water. since 1 gallon of water = 128 fluid oz which is approximately 128 oz of weight, then 1 gal of water = 128/16=8 pounds so, 73.7 % of 8 pounds is 5.9 pounds... or... gas weighs about 6 pounds per gallon.powderbrake2006-09-26 07:47:38 Link to comment Share on other sites More sharing options...
JohnCh Posted September 26, 2006 Share Posted September 26, 2006 When my Westfield SEiW was corner balanced with 4 gallons of fuel, it came in at 1238.5lb. 2.0L Duratec Custom roll bar built for strength not light weight Heavy 14” wheels (14lb/ea) LSD Type-9 Windscreen MOG carbon fiber seats No heater, spare, or carpets -John Link to comment Share on other sites More sharing options...
slomove Posted September 26, 2006 Share Posted September 26, 2006 We did a cornerweight session with 4 Sevens a while ago with following results (names anonymized except my own). Since all weights were taken originally with driver I deducted what I believe may be their weight http://www.usa7s.com/aspnetforum/images/emoticons/smile5.gif Result was: My own car (Birkin S3, Zetec/T9, 13" wheels with ACB10, no spare, 4 gal fuel, 20pound sump guard) :1338 pounds Mr. C. (Caterham (Superlight ?), Duratec/T9, 13" wheels with ACB10, no spare, unknown fuel): 1310 pounds Mr. S. (Birkin S3, Zetec/T9, 15" wheels with Toyos, with spare wheel, unknown fuel):1420 pounds Mr. M. (Caterham SV, Zetec w/ supercharger&6-speed, 15" wheels??, no spare, unknown fuel): 1475 pounds Link to comment Share on other sites More sharing options...
slngsht Posted September 26, 2006 Share Posted September 26, 2006 I always thought superlights were in the 11xx lb range. http://www.usa7s.com/aspnetforum/images/emoticons/confused5.gif Link to comment Share on other sites More sharing options...
slomove Posted September 26, 2006 Share Posted September 26, 2006 Yeah, we were all a bit surprised and part of a possible error may be my >super precision scale setup but I calibrated it and it should be good to some 5-10 pounds per corner. Unlikely that all corners are off in the same direction. But, after all it is not a pro racing scale, maybe the tank was full and maybe I underestimated the driver weight http://www.usa7s.com/aspnetforum/images/emoticons/biggrin5.gifhttp://www.usa7s.com/aspnetforum/images/emoticons/biggrin5.gif Gert P.S.: a lot of the manufacturer's weight data seems to be anyway optimistic at best, bullshit at worst, measured with no fluid, etc.slomove2006-09-26 19:48:23 Link to comment Share on other sites More sharing options...
slngsht Posted September 27, 2006 Share Posted September 27, 2006 Rotus did the same thing... I think they said 1320 lbs or something, but the lightest customer car I've seen is Joe W's car at 1525 lbs. And his car does not have anything unnecessary on it (dedicated autox car). Link to comment Share on other sites More sharing options...
slngsht Posted September 27, 2006 Share Posted September 27, 2006 By the way, that scale setup rocks! Link to comment Share on other sites More sharing options...
solder_guy Posted September 28, 2006 Share Posted September 28, 2006 Rotus did the same thing... I think they said 1320 lbs or something, but the lightest customer car I've seen is Joe W's car at 1525 lbs. And his car does not have anything unnecessary on it (dedicated autox car). The color Rotus brochure quotes 1237 lbs dry with a Toyota 3T engine. Rob Mitchell, Atlanta, GA Link to comment Share on other sites More sharing options...
yellowss7 Posted September 28, 2006 Share Posted September 28, 2006 My Caterham superlight weighed in at 1164 lbs. when I had it cornerweighted last year. Dry sumped Rover K series 6 speed Painted MB Magnesium wheels Avon CR500 tires FIA Rollbar Windscreen 4 gallons of gas Link to comment Share on other sites More sharing options...
stevet Posted September 28, 2006 Share Posted September 28, 2006 How did you get the Rover engine over here - not through Caterham I assume? Link to comment Share on other sites More sharing options...
yellowss7 Posted September 28, 2006 Share Posted September 28, 2006 Ordered it through QED (Quorn Engineering Development)in the UK. Picked it up at customs. No issues. They were pretty easy to deal with. They have a few different levels of tune to suit your needs or wallet. Engine was complete, with mapping and dyno sheet. It's a nice light enging for the 7. Makes pretty good power too. Link to comment Share on other sites More sharing options...
Mike Rohaley Posted September 28, 2006 Author Share Posted September 28, 2006 I still have not run my car across a scale yet but I thought this would be interesting. The April/May 1997 issue of Sports Car International has a nice write-up of the Caterham Superlight Trophy Car. It came in at 946 lbs. (yes, 946) Rover K-series (148hp, 115lbs.ft.torque) Aluminum nosecone and standard fiberglass cycle fenders Kart style fiberglass driver seat (no passenger seat) No spare wheel No spare wheel bracket No windscreen No wipers/motor No foul weather gear No paint (it saves 5 whole pounds!) No heater No lighting Tach,fuel and water temp gauges only (no rockers either) 13x6 Panasports with 185/60R13's On board fire system Caterham 6 speed box For me personally, that is a lot of no's. but if the goal is performance I suppose it would be worth it. I will not start yanking parts off my car any time soon to match as I kinda like being able to drive the car at night.....in the rain.....with a passenger (you know, performance robbing accomedations like that). Mike Rohaley2006-09-28 16:07:54 Link to comment Share on other sites More sharing options...
yellowss7 Posted September 28, 2006 Share Posted September 28, 2006 946 might be about right, as I have the windscreen,heater,paint,wipers,lighting,clams up front. MB wheels are alot lighter than the panasports. I'm still the heaviest item in the car. Although my K is tuned slightly higher with 196 BHP and 150 lb/ft torque. http://www.usa7s.com/aspnetforum/images/emoticons/coolgleamA.gifyellowss72006-09-28 16:15:19 Link to comment Share on other sites More sharing options...
JohnCh Posted September 29, 2006 Share Posted September 29, 2006 Fluke Motorsports has a >weght database available where users can submit weights of various components -- including entire cars. >Here are the results for the latter. Makes for interesting reading. -John Link to comment Share on other sites More sharing options...
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