Autocrossing & Roadracing Suspension Setup for Track Corvettes, Camber/Caster Adjustments, R-Compound Tires, Race Slicks, Tips on Driving Technique, Events, Results
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The Speedlab Corvette.

 
Old 07-11-2009, 02:06 PM
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hemipanter
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Default The Speedlab Corvette.

After over two years of building work, the car is finally out for a test ride.
This was just a day of driving tests to see if everything was funktioning properly, in order to hire a test track later on for more serious testing.
The thing still missing is the rear wing, but I am working on a new profile to suite the speed of our tracks here.
I read elswhere that some people wondered why i was using C4 drivechafts. It is not C4 shafts, those are shafts much longer made by myself. They are not very large diameter since everything is very tight fittings, and larger than nessesary is not possible. These axles ar made from Crm tubings ad very light. The diffrential is cooled by a separate radiator.

The spec is, weight 2100p, Tw 64,5"f - 63,7"r, Wb 95,7", Width 78,74" and heigt 39".



Regards
Goran
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Old 07-11-2009, 02:18 PM
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very very nice keep us posted. Light
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Old 07-11-2009, 02:50 PM
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St. Jude Donor '09
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Powerplant, horsepower, brakes? Damn light. More information please.

San
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Old 07-11-2009, 04:59 PM
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Johan, Michael, is this the new car?
Looks awesome.

Jim
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Old 07-11-2009, 06:18 PM
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Originally Posted by oldmansan View Post
Powerplant, horsepower, brakes? Damn light. More information please.

San
I should try to give brief info about the car. It is a design very much of my own so there is a lot to be explained to give a complete picture.
The wheels ar standard GT racing stuff 13x18f and 14x18 r, tires are 25,6" dia and 28" dia rear. The A-arm and upprights front and rear are designed for powerful downforce and has almost Zero SAI and scrub. The spindle is very much centered in the wheel. Look at the steering arm design that goes outside the disc for proper Ackermann.

Brakes are AP and discs are 13x1,25" all around. 52% rear weight together with very low CGH and downforce makes for more rear wheel braking work.
This is the front frame. Shocks are specially built by Ohlins.


And the rear.

Engine is fare back in the chassis an very low mounting, in fact in line with the lowest point of the gearbox.
This show the engine mounting plate that is part of the cam drive cower.
Oil pump drive is behind the HM for a compact install.

Headers are 7-Y design.

Basic engine is the same as used in the former Race car, a 550 hp Sbc, but it works properly for sorting the chassis out and a few test races.
Engine is offset to the right to compensate for driver weight and give more centered and roomy driving place.
Chassis torional stability is some 25000Nm/dgr. Starting spring stiffness are 4,5 Hz but both springs and shocks will be rebuilt as I know the downforce numbers. Tha car has both front and rear diffussers. The front diffussers emerge the side outlet of the car.

Car has a plywood underside, image is during building process.
Goran
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Old 07-11-2009, 09:20 PM
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I'm glad I asked and thank you very much for the expanded details. Damn nice!

San
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Old 07-11-2009, 10:53 PM
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Can't wait to hear about it's first time at the track!!!

Randy
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Old 07-12-2009, 03:42 AM
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Looking forward to see it live !

More pictures but the text in swedish ...
http://www.speedlab.se/wordpress/
http://www.speedlab.se/wordpress/?page_id=96
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Old 07-12-2009, 07:34 AM
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That is one killer car !! We need track videos !!! Keep us informed as you sort it out, with only 2100 LBS it should be blindingly fast.
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Old 07-13-2009, 04:36 AM
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Originally Posted by CHJ In Virginia View Post
That is one killer car !! We need track videos !!! Keep us informed as you sort it out, with only 2100 LBS it should be blindingly fast.
Hope this link work. This is a you tube video from the test.
http://www.speedlab.se/wordpress/?p=539
Goran
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Old 07-13-2009, 04:59 AM
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Lots of work to build a car like that. Congrats and good luck!
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Old 07-13-2009, 08:01 AM
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Very well done! ! Congratulations
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Old 07-16-2009, 12:29 AM
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Great job! Did you find greater ground compliance with 4-5 Hz, compared with 2 Hz?
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Old 07-16-2009, 05:49 AM
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As this car is calculated to have much downforce, 2 Hz is impossible to use. It should ground itself in higher speeds. So, the backside of greater spring stiffness is overruled by the grip of downforce. I can not allow the car to alter its ride height or to be to sensitive to pitch movements since this alters the downforce value.
Goran
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Old 07-27-2009, 02:00 AM
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Johan, Michael, is this the new car?
Looks awesome.

Jim


Hi Jim!

Itīs your original car, now heavely "modified" .

We still use the old 358ccu engine with some smaller changes. You wold like the sound and response of it now, with the new 7Y header system and no flywheel...
Here is short film when I started it up some month ago.
http://www.youtube.com/watch?v=loHMF...eature=related

Our plan is to get out on a test track this or next week to start the tuning. We will do our best to have it race ready to August/September, but the goal is the 2010 season in the NSC series. http://www.nordicsupercar.com/

We will keep you updated.

Regards
/Johan

www.speedlab.se
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Old 07-31-2009, 02:59 PM
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This is the first real track testings of the car. At Barkaby the 31 august 2009.

The front diffusser went. A-arms is seen inside.

Pit stop.

At a speed of 110 mph the downforce is grounding the splitter.

The rear diffusser is like a big vacuum cleaner sucking upp dusts.


The car is waist height.
The next step is to mount the rear wing and see what difference it makes.
Regrds
Goran
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Old 07-31-2009, 03:40 PM
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Now THAT'S a good application for duel rate springs!

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Old 08-01-2009, 06:47 AM
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The comments from the drivers where that the steering felt light when standing still but was getting stiffer by speed, but never really hard. Very direct and responsive. Power steering will not be needed unless the geometry needs to be altered for whatever the reason might be. We had 1,5 degree of camber and 2 dgr caster for a starter. But we didnít do very much cornering with the car, mostly aero testing. We must go up in spring rate probably 5 Hz or in the neighbourhood. As expected we must make more use of the rear brakes and I am curious to see where the braking power G lands. Skidpad is also on the list to collect informationís. Header to driver insulation of heat seem fine, we did put a lot effort here with regards to the situation of the old car. The sound of the exhaust system is quite as expected, so silencing is of no problem, which contributes to a cooler header system.
Regards
Goran
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Old 08-04-2009, 06:09 AM
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Here is a tube video from the Barkaby test day. Sorry, it is just "heating the tires up" rounds, but still a little trottle in the last part. Dont ask me why there is no higher speeds driving in the film.
http://www.youtube.com/watch?v=-h6yZ...layer_embedded

Goran
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Old 08-04-2009, 10:18 AM
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Very very Cool Goran
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