Some Garage Time

Update by Per Schroeder to the LeGrand Mk 18 project car
Oct 27, 2011

Our LeGrand is up on a jack and blocks, getting some little tweaks.
We replaced the 5w30 oil with some 10w40—and we also removed our oil cooler to reduce weight—the former should help make up for the latter—which isn't all that necessary for Solo use.
Next up, we need to replace our wheel studs with some longer racing pieces.
A new molded seat is in the works for our co-driver.

Even with Nationals behind us, we’re still working on making the LeGrand faster and more reliable.

Even with Nationals behind us, we’re still working on making the LeGrand faster and more reliable. We spent a few hours this weekend changing the oil, this time to Brad Penn’s racing 10w30 and continuing our work on a new foam BSCI seat for our co-driver. We also changed our gearing again—this time we reinstalled the 13-tooth front sprocket. We’re thinking it may be faster to carry third gear more, rather than constantly banging up against the rev limiter in second gear.

The gearing change seemed to help some with ‘out of the hole’ acceleration at our next local event, but the course wasn’t fast enough to take advantage of the now-short third gear. You can see video of that event below.

Next up, we’re thinking about removing our rear anti-roll bar to allow the inside wheel to stay on the ground better—we are getting some wheelspin from the Wavetrac helical differential. An added plus is that we could lose another 6 or 7 pounds with the removal of the bar.

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View comments on the GRM forums
alfadriver GRM+ Memberand UltimaDork
10/27/11 2:46 p.m.

Is the course that bumpy, or does the engine start acting funny the faster you go?

Per Schroeder
Per Schroeder PowerDork
10/27/11 3:18 p.m.

It's amazing what little bumps do to a lightweight/high hp car. I'm hoping that getting rid of the rear anti-roll bar helps droop travel and stops some of that.

DaewooOfDeath Dork
10/27/11 10:33 p.m.

It seems like a car that small and that low wouldn't need much to control roll. Have you tried a tiny bar in front and nothing in the back?

Per Schroeder
Per Schroeder PowerDork
10/28/11 9:39 a.m.

It still needs a front bar---but the rear has been removed and I'm waiting for the next event or two to see if that helps. Part of the choppiness that Alfadriver notes is actually my/foot leg bouncing on the gas pedal--something I'm still working on controlling at lower speeds. Other drivers use stirrups to keep their legs from moving too much.

10/28/11 10:32 a.m.

Stirrups, Giddyup!!

fifty HalfDork
10/29/11 1:15 p.m.

Is that an iPhone on the dash, and if so, what datalogging software are you running?

Per Schroeder
Per Schroeder PowerDork
10/31/11 9:01 a.m.

I'm trying out Harry's lap timer.

nmscot New Reader
10/31/11 7:11 p.m.

I use to live in FLA back in the 70' and did some autocrossing -- where is that site?

Per Schroeder
Per Schroeder PowerDork
10/31/11 8:32 p.m.

Orange County Convention Center-- new-to-SCCA lot.

motomoron SuperDork
10/31/11 9:25 p.m.

I have to drag the side of my shoe on the chassis skin of the footwell when I'm driving the Radical in the paddock or it can get all choppy and messy and bucking and whatnot, mighty quickly.

BTW - I'm buying a set of 25s next year and trying B mod.

Per Schroeder
Per Schroeder PowerDork
11/1/11 9:52 a.m.

That makes me think some grip tape on the side of the footwell might help. Hmmmmm

Ian F
Ian F MegaDork
11/3/11 10:08 a.m.

Would a damper on the throttle linkage help? Something small like a VW TDI belt tensioner damper comes to mind.

chknhwk HalfDork
11/16/11 4:53 a.m.

Speaking of using smartphones for data-logging, how is everybody mounting them? I have a new app I want to try but unsure what's going to be allowed by tech.

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