What a DIFFerence

Per
Update by Per Schroeder to the LeGrand Mk 18 project car
Nov 23, 2009

The LeGrand attracted a lot of attention in grid.
Here's an at-speed shot courtesy of Matt Skowronski.

We finally got our LeGrand out to an event after converting to the SFRE differential and installing the FF axles and uprights. We’re pretty site-limited here in Florida, and this local gathering took place at our DeLand airport venue. The asphalt there is badly degrading, but it’s got some grip if you run a tight line and stay out of the marbles.

We ran third heat. By that time, our fast local Shifter Kart guy had second on index behind Per’s wife, Kim, who was in the HS MINI. Shifter Kart times were in the high 41.9s, while Kim was a mid-49 in HS. We ran a 43.5, 42.9, 42.33 and 42.0+1, putting us in the top group on index; we’re not sure where, exactly, since results aren’t posted yet and there were some other fast guys in that third heat. Plus, the site’s limited grip was an extra challenge for our Mod car.

Holy crap! The differential was an absolute transformation. We could accelerate in a corner without that instant oversteer. The car could carve sweepers like, well, a real car—just really fast. There wasn’t any more real low-speed push than before, just more rear grip. The differential clearly provided a big boost in performance.

Now we need to take the bodywork off the rear and tighten our chain (this was our first event on that particular piece of equipment). This was also our first time out after the top-end rebuild on the KZ, so we need to check all our nuts and bolts, then double-check the valve clearances and mixture.

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Comments
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turboswede
turboswede GRM+ Memberand UltimaDork
11/23/09 11:08 a.m.

Congrats on a successful outing for the entire Schroeder clan!

Gonzo_Bmod
Gonzo_Bmod Reader
11/23/09 3:24 p.m.

You had me sold at "Holy Crap". Glad you are happy with the changes. Now I don't feel so bad about spending the $$$.

Per Schroeder
Per Schroeder PowerDork
11/23/09 4:56 p.m.

Kim and I wound up 4th and 5th on index.
http://www.cfrsolo2.com/2009/2009_11_22_deland_practice_pax.htm

I coned away what would have been 1st on index. doh!

cantrade
cantrade None
12/3/09 12:36 p.m.

I may have missed it in the previous discussions but I am wondering how you extended the wheel base to achieve the 80" requirement? NIce interesting project car.

Per Schroeder
Per Schroeder PowerDork
12/4/09 2:57 p.m.

The wheelbase was extended in the early 90s by Soter Slomski and Bill Gendron of SFRE.

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