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Old 02-08-2004, 08:57 PM   #6706
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Quote:
Originally posted by mo
I've only run the car 1 race day so there isn't any wear.
Cool, just wondering if there was unusual wear, but it doesnt sound like it...
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Old 02-08-2004, 09:38 PM   #6707
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What was the issue or ill handling traits of the SD? I ran mine for the first time today and picked up a lap over my XRAY...just wondering what I'm missing.

Thanks
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Old 02-08-2004, 09:54 PM   #6708
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I just rebuilt the diffs on my SD and put on the graphite diff cases, and somehow the drive train doesn't spin smoothly now.
the notchy feel is at the rear end of the drive train and it feels like the diff gear is not flat or something similar, the drive train spins smoothly till a point that i can really feel each tooth is going by and after that 5-6 teeth it rotate smoothly again

is it time to replace the gears, or did i messed up somewhere?
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Old 02-08-2004, 09:54 PM   #6709
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What is a good gear ratio for stock class?

Also what springs/oil weight you using for the shocks?
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Old 02-08-2004, 10:11 PM   #6710
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Quote:
Originally posted by Fire
I just rebuilt the diffs on my SD and put on the graphite diff cases, and somehow the drive train doesn't spin smoothly now.
the notchy feel is at the rear end of the drive train and it feels like the diff gear is not flat or something similar, the drive train spins smoothly till a point that i can really feel each tooth is going by and after that 5-6 teeth it rotate smoothly again

is it time to replace the gears, or did i messed up somewhere?
Just drive it, and it will free up a bit, then reshim it if needed.
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Old 02-08-2004, 10:12 PM   #6711
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Quote:
Originally posted by nitro_tacklebox
What is a good gear ratio for stock class?

Also what springs/oil weight you using for the shocks?
What is the track surface, and dimentions?
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Old 02-08-2004, 10:39 PM   #6712
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Not really sure of the dimensions but it is an indoor carpet track. I am really looking for a base setup on the shocks and I know the kit springs arent the way to go, at least they feel too soft.
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Old 02-08-2004, 11:03 PM   #6713
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Well stock motor (considering it's a monster) I'd gear right in the 7.0 range for starters.

I havent run stock motor with rubber tires, maybe pops can help you out there.
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Old 02-09-2004, 02:50 AM   #6714
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Quote:
Originally posted by mo
You guys are over analizing everything! Theories, numbers and what it's "supposed to do" don't mean anything compared to track testing. I ran the car with both a 10x1 and a stock motor. I haven't run stock in a really long time so it all feels slow to me. I had another guy at the track, that runs a Yokomo in stock all the time, put his motor and batteries in my car with as close to the same overall gear ratio as we could get. He said it was a little punchier and the motor was cooler to the touch.

I don't care what theories you can quote, track testing tells me it's good.
Perhaps your tranny is freer than his?

Track testing with your car tells you whether your car works or not. However it is not telling you that your 2.5 ratio is definitely better over the stock internal gearing - there are 101 other variables that could be misleading you (AND us) into thinking that 2.5 is better. Anything from how eagerly you apply the throttle in a particular race to how much traffic you have to contend with, to (dare I say it) plain old wishful thinking.

So before you go out and accuse those of us who like to think first of 'analizing' everything and claiming that the use of good old fashion logic has no place in racing, think again. Whilst I'm convinced your car runs very well, I'm not convinced that buying an over-priced 'down'grade is going to make any improvement to my car.

If it does work - where's the harm in trying to find out why? Correct me if I'm wrong, but isn't this what the thread is for?
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Old 02-09-2004, 07:50 AM   #6715
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Quote:
Originally posted by Horatio
Track testing with your car tells you whether your car works or not. However it is not telling you that your 2.5 ratio is definitely better over the stock internal gearing - there are 101 other variables that could be misleading you (AND us) into thinking that 2.5 is better. Anything from how eagerly you apply the throttle in a particular race to how much traffic you have to contend with, to (dare I say it) plain old wishful thinking.
Is there a reason why 1.77 low ratio pulleys were released for the Xray T1/Evo2 despite what stock ratio it has when the car was launched? I am quite sure Xray drivers could achieve whatever final ratios they wanted with both internal ratios. So could that explaination (whatever it is?) be applied to this discussion?
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Old 02-09-2004, 08:01 AM   #6716
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lookin for carpet set up sheets for the following:

stock with rubber

mod with foams.

Can someone direct me to a site or link. I have a few good ones but would like to see if theres anything new out there
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Old 02-09-2004, 08:55 AM   #6717
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Quote:
Originally posted by Kenneth Tan
Is there a reason why 1.77 low ratio pulleys were released for the Xray T1/Evo2 despite what stock ratio it has when the car was launched? I am quite sure Xray drivers could achieve whatever final ratios they wanted with both internal ratios. So could that explaination (whatever it is?) be applied to this discussion?
And you can add the Schumacher Mission to the list as well. It has an internal ratio option - one for short tracks, the other for large tracks. With the mission this option is included with the kit as far as I know.

It simply increases the range of ratios the car has available, that's all. At no point has Schumacher claimed that the optional pulley 'increases run time' or 'makes your motor run cooler'.

When the SD 2.5 option was being described as an upgrade on this thread a couple of weeks ago, the person making this these wild claims had one intention only - to sell as many as possible!

As soon as we all questioned him, he disappeared. Now Mo has actually tried the 2.5 kit and likes it - the discussions are back on The theory behind changing the internal ratios should apply to any TC, so I guess you're right to mention the Xray.
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Old 02-09-2004, 09:13 AM   #6718
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Here is my setup for the CGM in stock from this weekend for anyone who is interested. It is also up on my website. www.mo-net.ws
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Old 02-09-2004, 09:15 AM   #6719
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Quote:
Originally posted by Kenneth Tan
Is there a reason why 1.77 low ratio pulleys were released for the Xray T1/Evo2 despite what stock ratio it has when the car was launched? I am quite sure Xray drivers could achieve whatever final ratios they wanted with both internal ratios. So could that explaination (whatever it is?) be applied to this discussion?
Yes there is a reason, but it is closely related to the type of drive train.

On a belt driven car, most of the losses are due to the binding of the belt. With this new pulley ratio, they achieved less binding on the belt and less linear speed of the belt aswell. Besides, the main shaft spins much slower, decreasing the amount of energy needed to move the car.

Only few of this is appliable on the SD drive train, only the energy.
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Old 02-09-2004, 09:42 AM   #6720
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Mo- So what are your early thoughts on the CGM? Any things standout? I like the looks of the shock towers.

Thanks for the setup info. Anyone run it on asphalt yet?

Jeff
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