Elise/Exige Racing Wide-body - LotusTalk - The Lotus Cars Community

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post #1 of 149 (permalink) Old 11-28-2009, 05:36 PM Thread Starter
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Elise/Exige Racing Wide-body

Here is a rear clam that we build for a race car. It is much wider than stock to accomodate up to 12" (wide) rear wheels. We did not just add wheel flares, the whole rear is made wider and blended into the doors. The link below is to a shot before the mold was taken. In the next few days I will post the final result i.e. carbon rear clam made with the mold.

It is made to fit an Exige roof i.e. has scoop provisions. Teh side vents have increased in size, so most of the air can be taken from there. We will use the top scoop for air intake. Hopefully there is some RAM effect there and the air is cleaner in the front on top fo the roof

We took special care for aerodynamic performance. The sides are similar to the original car i.e. vertical and flat. The deck is as flat as possible. The slope fo the rear cover is less than 11 degrees.

http://www.youtube.com/watch?v=myW65dfml0c

Originally I was planning to make one for myself and keep the mold, if I needed spares. I think, it worked out very well. I can strengthen the mold to make more in Carbon or Fiberglass.

Anton
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post #2 of 149 (permalink) Old 11-28-2009, 06:43 PM
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Keep us posted

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post #3 of 149 (permalink) Old 11-28-2009, 06:44 PM
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Great preview! You have my interest -- for what car is this going on? A race car for what series? Keep us updated

Carpe Viam "Seize the Road"
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post #4 of 149 (permalink) Old 11-29-2009, 07:48 AM Thread Starter
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re: Widebody

I just wanted to build a track car for myself. Maybe race in the CASC-OR (Canadian version of SCCA) regionals. There are just 20 minute sprints, now. In the old days we had a 1 hour enduro with a $10,000 first prize. There were people running LeMans GT1 Porsche and Corvette (me) cars in that series.

So the rear clam has some definite GT1 or LMP2 DNA. We borrowed some concepts from their wind-tunnel testing for 200mph, since have the old car sitting here. It is also about the same width. Since the airflow down the back is pretty clean, it may take a smaller rear wing. Brake and engine air can come from larger side scoops.


Anton


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Originally Posted by Carpe | Viam View Post
Great preview! You have my interest -- for what car is this going on? A race car for what series? Keep us updated
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post #5 of 149 (permalink) Old 11-29-2009, 08:34 AM
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I definitely see some Elise Gt1 influence:



Is the front clam going to be wider to match?

Carpe Viam "Seize the Road"
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post #6 of 149 (permalink) Old 11-29-2009, 09:45 AM
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nice work
do you have more pictures ?
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post #7 of 149 (permalink) Old 11-29-2009, 11:15 AM Thread Starter
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re: GT1 influence

The original Elise GT1 used Corvette ZR1 engine developed by Lotus for GM (at this time GM owned Lotus, if you recall). Do not confuse the 1990's ZR1 with the current ZR-1.... My friend located and sold them the race engines at the time.

You can see on any racing body the rear deck is flat and the rear sides are flat and straight down. If one was to round things off, it would generate lift.

I got an S1 front from prototype composites. It is a very nice piece of work with exposed carbon. I think, it will fit 9 to 10" wheel, so I should be fine.
I really did not have a rear clam solution so here it is. So I do not have a dront as wide as the GT1 but almost

Anton

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Originally Posted by Carpe | Viam View Post
I definitely see some Elise Gt1 influence:



Is the front clam going to be wider to match?
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post #8 of 149 (permalink) Old 11-29-2009, 01:57 PM Thread Starter
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re: More Pics

The video is from a few days back. the mold is almost finished. When we make the final piece, I will take pics of the whole car and post them.

Anton

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nice work
do you have more pictures ?
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post #9 of 149 (permalink) Old 11-29-2009, 02:43 PM
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Looks great, what are your plans to get to the motor?

Any plans to modify the front fenders?

All torque, no traction...Exige S.
Real sports cars don't have A/C!
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post #10 of 149 (permalink) Old 11-30-2009, 07:24 AM Thread Starter
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We will make the clam pivot to the back. It is just CF, so will be light. WE will make two pivot points around the back of the crush structure. We will use some quick-disconnect fasteners in the front of the clam. So it will pivot to open or completely removed with 2 bolts.

The front clam is wider already. It should take 10" wheel and tire.

Anton

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Looks great, what are your plans to get to the motor?

Any plans to modify the front fenders?
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post #11 of 149 (permalink) Old 12-10-2009, 09:00 PM Thread Starter
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Suspension going in, rear clam almost done

Final layer going into the mold tomorrow. We will extract the clam and test mount by Monday.

Here is the racing suspension.

Anton
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post #12 of 149 (permalink) Old 12-13-2009, 01:46 AM
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Blimey, those are some big discs! How much power and weight are you expecting on the basis you need those?!
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post #13 of 149 (permalink) Old 12-13-2009, 06:47 PM Thread Starter
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re: brakes

This is a car design for circuit (road)-racing. The design point is 1500lbs dry and 550hp. The rear disk is not that big 280mm and 27mm thick. Just a small upgrade from stock. I believe that in a well balances car front and rear braking is almost the same. The rear is designed to run 12 inch slicks.

Anton

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Blimey, those are some big discs! How much power and weight are you expecting on the basis you need those?!
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post #14 of 149 (permalink) Old 12-13-2009, 07:50 PM Thread Starter
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Custom Upright pics

These are made from 7475 aluminum. Stronger than mild steel and guaranteed notch resistant from manufacturer for aircraft work. Other aluminum alloys are NOT.

There is no rubber left in the suspension. It is all spherical bearing.

Brakes are standard Brembo (NASCAR) mount, so any number of calipers will bolt-on.

Rotor hats are made from 7050. I would not use anything other than a 7xxx series aluminum alloy for hats, all the others get too soft with heat. I had one mode from 6xxx come apart on me before.

A stock Corvette 17x8.5 wheel fits perfectly in the front, but does not clear the caliper (it would not on a Corvette, either).

We made a racing 3-pass radiator that fits stock mounts. You can see the shroud is trimmed, but that is because it is an S1 front clip on S2 chassis and rad shroud.

Anton
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post #15 of 149 (permalink) Old 12-14-2009, 08:00 AM
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are the appendages on the calipers to protect the bleeder nipple and bridge tube on wheel changes?
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post #16 of 149 (permalink) Old 12-14-2009, 08:49 AM
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yes

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post #17 of 149 (permalink) Old 12-14-2009, 08:55 AM Thread Starter
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Rear Clam out of the mold

Here it is!

Wide rear clam made from Carbon-Kevlar material. This is a racing part, so no exposed Carbon, made to be painted.

Soon will have pics with the car.

Anton
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post #18 of 149 (permalink) Old 12-14-2009, 08:59 AM Thread Starter
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re: calipers

These are NASCAR parts. Good, plentiful and inexpensive. Also fit our wheels, since NASCAR runs 15x10.

The guards also protect from rubber and rocks getting lodged between wheel and caliper and chewing it up, since with 15 inch wheel there is very little clearance.

Anton

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are the appendages on the calipers to protect the bleeder nipple and bridge tube on wheel changes?
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post #19 of 149 (permalink) Old 12-14-2009, 10:51 AM
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subscribed!

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post #20 of 149 (permalink) Old 12-14-2009, 01:49 PM
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can't wait to see the finished product.

** save ~10 lbs gain 1 hp ** EQ: Y=(190*X) / (1984-X) where Y is (HP) and X is (lbs)

'07 Lotus Exige S310


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