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Post by fearny7hills on Mar 8, 2017 14:21:09 GMT
Hi all,
What kind of performance improvements do I expect to have over the doner MX5, as in 0 to 60 times as the benchmark? Also anyone have experience of how the Exocet compares to traditional 7 type kits?
I have a mk2 1.8 doner and guessing it is close to the 950kg, the Exocet about 700kg and 7's roughly 500kg??
I did have a great conversation with a MEV owner at the autosport show but he said the weight of his was a secret!?!
Hopefully someone will let me into the circle of trust......
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Post by Stiggy on Mar 8, 2017 15:26:07 GMT
All kit cars are individual and vary in performance and weight. 7's for instance are seldom 500 kg but there are often claims of even less.
When building a kit there are lots to consider if weight saving is your ultimate goal;
18" wheels with 225 tyres will probably be a lot heavier than 15" with 185's.
Hubs and calipers can be alloy instead of forged steel.
Seats can be grp or heavy padded recliners.
Tank can be alloy instead of the steel one.
Engine swaps are also possible that can impact on weight.
Splitters and spoilers with mounting hardware can make a big difference.
Turbo or superchargers with brackets, belts and inter coolers will also add weight.
Little lithium batteries can offer a significant weight saving.
Wishbone sets from MEV are also lighter than the standard ones, but not a lot.
A CDS roll cage and steel floors add significantly to overall weight.
More importantly is balance, the Exocet is 50-50 balanced with a driver on board, exiting corners is therefore quicker than a 7 with the same power every time.
Consider an MX5 as being something like 50% heavier than Exocet, the reward in performance is easy to imagine, if you have a quick MX5 and convert it to an Exocet it will probably be 30% quicker, and it will stop quicker.
There is no set weight figure, BUT talking of figures, mine is being trimmed in readiness for the spring, no point in emptying your pockets on parts to save weight when you can just lose a few pounds by eating lettuce with a sprinkling of dust. NO GARNISH !
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Post by cooltech on Mar 8, 2017 16:13:42 GMT
Don't forget also the 60-0 times.... especially if you have any plans to have it on the track. A car with a lot of HP can accelerate quickly. A LIGHT car can accelerate well, brake well, corner well, etc. Weight is truly the enemy  |
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Post by Stewart on Mar 8, 2017 17:10:03 GMT
The race cars are coming in around 815kg with driver, full roll cage and steel floor.
I think 0-60 is around 5.5 seconds.
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Post by Stiggy on Mar 8, 2017 17:53:28 GMT
a 600 kg version would get you to the finish line quicker, or would it, without the extra protection you would probably drive slower.
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Post by Stewart on Mar 8, 2017 18:18:02 GMT
Probably not, it wouldn't be setup as well as a race car, and the driver wouldn't be as good  |
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Post by fearny7hills on Mar 8, 2017 19:13:08 GMT
Thanks for the guidance all. Yeah you're right, it's not the only thing to consider, the 50:50 weight distribution is important to me, I'd say more than most. Also the crashworthiness, 25mm box section makes me think I'd rather have something substantial to my right than a my elbow....
I genuinely have lost weight myself to fit into a project car, 3st lost and another 1 to go. I was too fat to get in a 7 last year!!
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Post by theancientone on Mar 8, 2017 21:01:11 GMT
The race cars are coming in around 815kg with driver, full roll cage and steel floor. I think 0-60 is around 5.5 seconds. Our 150R (same spec as above) recorded 750kgs at IVA. With the MP62 etc etc added it's now about 780kgs....so about 850kgs with driver. What level of bhp and lbft are the race cars to achieve 0 -> 60 in 5.5 seconds? Thanks. By the way, after a rear upper wishbone detached itself from the chassis on our MNR Vortx going round the hairpin at Cadwell I've become wary of space frames. I like the solidity of MX5 subframes, wishbones and substantial roll cage....even at the expense of greater weight. Especially when my son and son in law drive the car. |
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Post by ikarl on Mar 8, 2017 22:10:54 GMT
I'm turbo'd with 237hp/atw....at my local track, I cannot keep up with the caterham R500's but I can pace with the R400's... everything else is easy enough to get by, including n/a Atom's!
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Post by theancientone on Mar 8, 2017 22:35:26 GMT
I'm turbo'd with 237hp/atw....at my local track, I cannot keep up with the caterham R500's but I can pace with the R400's... everything else is easy enough to get by, including n/a Atom's! That's very impressive! Is that on a stock engine? Which coilovers are you running? |
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Post by cooltech on Mar 9, 2017 1:30:29 GMT
I'd be interested in your front/rear spring rates and if you have tried different setups.
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Post by ikarl on Mar 9, 2017 8:09:44 GMT
I'm turbo'd with 237hp/atw....at my local track, I cannot keep up with the caterham R500's but I can pace with the R400's... everything else is easy enough to get by, including n/a Atom's! That's very impressive! Is that on a stock engine? Which coilovers are you running? Yeah, stock engine.... td04-13t, Megasquirt, rx8 injectors etc Gaz Gold Pro's
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Post by h20boynz on Mar 9, 2017 8:46:25 GMT
Just weighed mine and it came in at 740kg which was heavier than I was expecting.
The wheels ive gone with are the biggest culprit I think. Theyre bloody heavy, 15x8 with 225 tyres. Then I used aluminium guards, its a big turbo, big 3 inch exhaust, big radiator and oil cooler etc etc so it adds up really quickly.
I'll get onto some weight reduction after final inspections are complete.
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Post by Stiggy on Mar 9, 2017 11:32:37 GMT
Roll bars for racing are made from CDS tube.
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Post by cooltech on Mar 9, 2017 14:56:20 GMT
YEOW!!!! Head well above the roll bar AND shoulder straps. Whoever let this guy out on a race track should be SHOT!!
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