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Speed Passion brand new Spec Racing LeMans car - The LM1

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Speed Passion brand new Spec Racing LeMans car - The LM1

Old 07-09-2014, 07:08 AM
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my new babies! love em!!!

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Old 07-09-2014, 09:33 AM
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More CF, I'll have the full rear end done now. Just need the upper deck to come back in stock.
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Old 07-09-2014, 02:57 PM
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Peugeot 908...very nice. Would love to see a Toyota TS040 themed body as well but the Peugeot should offer some nice variety to the LM1 class
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Old 07-11-2014, 11:03 PM
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Hey guys, has anyone by any chance bent the rear axle on their LM-1? I was running mine for the first time at a local track where I hit the wall and on inspecting it after the qualifier I noticed the axle was bent. Has this happened to anyone else?
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Old 07-12-2014, 05:52 AM
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It happens. I got blasted by a car a coming from a couple lanes over (!) and it bent the axle on my car.
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Old 07-12-2014, 06:58 PM
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Originally Posted by xrayracer1 View Post
Hey guys, has anyone by any chance bent the rear axle on their LM-1? I was running mine for the first time at a local track where I hit the wall and on inspecting it after the qualifier I noticed the axle was bent. Has this happened to anyone else?
Bent axle here too. One carbon axle that failed with the grain also. Nerf bars would be nice.
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Old 07-12-2014, 08:32 PM
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I haven't checked it yet, so I apologize in advance for asking. Is the axle interchangeable with the F103, F104, or others?
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Old 07-12-2014, 10:47 PM
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Originally Posted by NutDriver View Post
I haven't checked it yet, so I apologize in advance for asking. Is the axle interchangeable with the F103, F104, or others?
Unless the f103 uses a different shaft to the f104, no they aren't interchangeable. the Speed Passion shaft has a thread on it for a nylock nut. The Tamiya ball diff is a slightly different setup.
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Old 07-14-2014, 03:08 PM
  #924  
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Default Haven't got any pan car experience before the LM-1...

...so I would really appreciate some pointers.

Ran my stock setup LM1 (21.5T 26/72, shorty in the back, fully sauced rears) on warm high grip asphalt this weekend, and had the rear chase the front in any high speed turn, no matter if I let off the throttle or not. Tirewear is even and I have no problem tracking straight, so camber and toe feels fine.
As both the fronts and rears hook up well in tighter turns at lower speed - I can jam the throttle out of any turn for 1,5 secs before things start to get shaky - I suspect the suspension is too soft.
Another clue that might tell you something is that using a full size battery made everything worse, to the extent that I'd be better off piloting the Swamp Dawg airboat around

Anyone have a clue what the viscosities of the stock oil and grease are, and perhaps also the spring rates on the stock springs? As always, ball park numbers (or colours) are better than nothing.
Edit: If my calipher isn't too far off, and I'm really counting 5,5 coils, the stock center spring rate is 8,25 lbs/in.

Second, which size/type/brand of springs fit the LM1?
Edit: I've ordered Tamiya springs, but see people also talk about AE (Team Associated?) and CRC, so I guess there is a standard.
  • Side springs - a selection of Tamiya roll springs (54352) are on the way (SP000735 isn't out yet).
  • Oil damper - thinking of trying 450 cSt oil next, but what about the spring? Neither my touring nor m-chassis springs fit very well. They're all shorter and also smaller in diameter, so I have to spend 3/4 of the preload thread just to get an m-chassis spring snug.
  • Front springs - ordered the Tamiya F1 Front Spring Set (50509) (the SP000734 set isn't available yet)

There are so many tuning options, and not that many running days, so where should I start?
As I've said already the grip is very good, had to exercise restraint to avoid traction rolling my other car, a 13.5T touring, on worn Sweep 36 rubbers. Hell, even my old, reglued Sweep 40s were screaming like B-movie horror actresses.

I do have some ideas on how to proceed, but don't really know if they're any good:
  • Reduce caster from 10* to 5* to ease some of the steering off (for now I've dialed the EPA down to 50%)
  • Switch to stiffer springs, if not all around then at least in the rear and middle, to help plant the car at higher speeds
  • Thicker oil and grease in the dampers, for the same reasons as above. My choices are the stock grease and some 60 000 cSt. 30 000 cSt soon in the mail.
  • Lower the ride height some (was 6.8mm stock, a little less after 10 packs of tire wear)
  • Find out how playing with the side springs, and changing the pod links - like having them go toe-in - affects handling

Sorry for the long mess, but I'm hoping for a sunny day tomorrow and didn't want to leave anything out

Last edited by bakoo; 07-15-2014 at 01:38 AM. Reason: I kant spel, forgot some things, updates.
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Old 07-15-2014, 12:03 PM
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Originally Posted by bakoo View Post
...so I would really appreciate some pointers.

Ran my stock setup LM1 (21.5T 26/72, shorty in the back, fully sauced rears) on warm high grip asphalt this weekend, and had the rear chase the front in any high speed turn, no matter if I let off the throttle or not. Tirewear is even and I have no problem tracking straight, so camber and toe feels fine.
As both the fronts and rears hook up well in tighter turns at lower speed - I can jam the throttle out of any turn for 1,5 secs before things start to get shaky - I suspect the suspension is too soft.
Another clue that might tell you something is that using a full size battery made everything worse, to the extent that I'd be better off piloting the Swamp Dawg airboat around

Anyone have a clue what the viscosities of the stock oil and grease are, and perhaps also the spring rates on the stock springs? As always, ball park numbers (or colours) are better than nothing.
Edit: If my calipher isn't too far off, and I'm really counting 5,5 coils, the stock center spring rate is 8,25 lbs/in.

Second, which size/type/brand of springs fit the LM1?
Edit: I've ordered Tamiya springs, but see people also talk about AE (Team Associated?) and CRC, so I guess there is a standard.
  • Side springs - a selection of Tamiya roll springs (54352) are on the way (SP000735 isn't out yet).
  • Oil damper - thinking of trying 450 cSt oil next, but what about the spring? Neither my touring nor m-chassis springs fit very well. They're all shorter and also smaller in diameter, so I have to spend 3/4 of the preload thread just to get an m-chassis spring snug.
  • Front springs - ordered the Tamiya F1 Front Spring Set (50509) (the SP000734 set isn't available yet)

There are so many tuning options, and not that many running days, so where should I start?
As I've said already the grip is very good, had to exercise restraint to avoid traction rolling my other car, a 13.5T touring, on worn Sweep 36 rubbers. Hell, even my old, reglued Sweep 40s were screaming like B-movie horror actresses.

I do have some ideas on how to proceed, but don't really know if they're any good:
  • Reduce caster from 10* to 5* to ease some of the steering off (for now I've dialed the EPA down to 50%)
  • Switch to stiffer springs, if not all around then at least in the rear and middle, to help plant the car at higher speeds
  • Thicker oil and grease in the dampers, for the same reasons as above. My choices are the stock grease and some 60 000 cSt. 30 000 cSt soon in the mail.
  • Lower the ride height some (was 6.8mm stock, a little less after 10 packs of tire wear)
  • Find out how playing with the side springs, and changing the pod links - like having them go toe-in - affects handling

Sorry for the long mess, but I'm hoping for a sunny day tomorrow and didn't want to leave anything out
You are on asphalt? I would say ride height is hurting you most. Damper oil weight 450 CST should work really well with the stock spring. Try adjusting the preload on the side springs. Kit setup is just touching to maybe a half turn touching, then adjust tweak. Front springs, make sure you have front droop of .5 to 1 mm with as little preload as possible. The springs themselves are very soft. I run Tamiya blacks which are very firm. As far as gearing you can go a couple teeth less on the pinion without losing top end. Also check your speed controller to make sure your launch control is turned down or current limiter is around 30 Amps. It will stop excessive wheel spin when you hit the motor's power band. Try to get a rollout around 52mm to start. Gear up and down from there depending on temperature.
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Old 07-15-2014, 01:27 PM
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Originally Posted by trackdesigner71 View Post
Any chance we could see other bodies like a Porsche 919 or a Toyota TS040 or Lotus T129 or Lola B12/60?
Hi trackdesigner71;

Yes......I'd say the chances are pretty good.

Dale Epp - Protoform Race Bodies
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Old 07-15-2014, 01:46 PM
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Originally Posted by liljohn1064 View Post
You are on asphalt? I would say ride height is hurting you most. Damper oil weight 450 CST should work really well with the stock spring. Try adjusting the preload on the side springs. Kit setup is just touching to maybe a half turn touching, then adjust tweak. Front springs, make sure you have front droop of .5 to 1 mm with as little preload as possible. The springs themselves are very soft. I run Tamiya blacks which are very firm. As far as gearing you can go a couple teeth less on the pinion without losing top end. Also check your speed controller to make sure your launch control is turned down or current limiter is around 30 Amps. It will stop excessive wheel spin when you hit the motor's power band. Try to get a rollout around 52mm to start. Gear up and down from there depending on temperature.
Thanks liljohn!

Yes, I'm on high grip asphalt. ESC is in blinky mode with punch and brakes dialed down, and motor temperatures are ok after 6 minutes of running, so the gearing stays for now. However, as soon as I get the car planted enough to do consistent laps I'll start playing with pinion sizes to find the sweet spot.

I'll start by lowering the ride height a bit, and try to get the droop and springs to where you recommend them being. Harder springs and thicker grease for the friction dampers will have to wait until the intercontinental mailman arrives.

Still not sure about which caster blocks to use. We're driving outside on asphalt on a flowing 1:10 track with only a couple of really tight turns, and I already have reduced steering end points to 50% - is there any reason for me to switch from 10* to 5* caster blocks, or would that just make tings worse?

Thanks again!
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Old 07-15-2014, 01:53 PM
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Originally Posted by bakoo View Post
Thanks liljohn!

Yes, I'm on high grip asphalt. ESC is in blinky mode with punch and brakes dialed down, and motor temperatures are ok after 6 minutes of running, so the gearing stays for now. However, as soon as I get the car planted enough to do consistent laps I'll start playing with pinion sizes to find the sweet spot.

I'll start by lowering the ride height a bit, and try to get the droop and springs to where you recommend them being. Harder springs and thicker grease for the friction dampers will have to wait until the intercontinental mailman arrives.

Still not sure about which caster blocks to use. We're driving outside on asphalt on a flowing 1:10 track with only a couple of really tight turns, and I already have reduced steering end points to 50% - is there any reason for me to switch from 10* to 5* caster blocks, or would that just make tings worse?

Thanks again!
Caster blocks, I use 5* with all shims back. I could probably go with 1 forward as I get enough camber gain from the caster setting and still no push (understeer). I'd keep lowering the caster until the front end starts to understeer a bit and then go back one shim.
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Old 07-15-2014, 06:29 PM
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Can you see any rear tire marks inside the body? I have seen the tires contact the body under a lot of roll.

Although you think the camber is ok, how much do you have? You may not need much more than .5*.

The center shock uses HPI sized springs. Tamiya springs are too small of a diameter, unless you use a Tamiya shock bottom and adjuster on the body.

The front springs are pretty soft, something like a Tamiya gold or an .018 spring would possibly be a little better.

Also what are you putting on the tires? Sunscreen is usually the best thing in combination with an initial layer of paragon
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Old 07-16-2014, 06:07 AM
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Originally Posted by daleepp View Post
Hi trackdesigner71;

Yes......I'd say the chances are pretty good.

Dale Epp - Protoform Race Bodies

Oooooohhh, sounds good!!!

Lola B12/60 please!!!
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