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Old 09-22-2004, 07:34 AM   #7576
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That was the answer I was looking for
Thanks
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Old 09-22-2004, 08:26 AM   #7577
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Good work Spud_J, the only thing to remember is that the wheel rate measured this way will only be a "snapshot" at that particular spot in the travel range of both the wheel and the spring/ damper. But then again, who wants to measure out 1mm increments and plot the graphs (oh wait I did :-), but then again I have the 3D models to manipulate ). Very good info for everyone to see how they can best use the springs they have to tune the car. I'm sure when you measured things out, you saw that the wheel rate is more progressive in some positions than others.

As for reference material, "Race Car Vehicle Dynamics" by Milliken & Milliken is a good one to have... but maybe a bit too engineering oriented for a casual read ;-). If you want things in "simpler" terms to get a better understanding, check out Carrol Smith's "Tune to Win." Some of the cars and construction methods are a bit dated, but people can still debate his tuning principals and his basic approach to a chassis.
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Old 09-22-2004, 09:09 AM   #7578
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Now that's what I love about RC car racing. I post something on this forum and the very same day the guy who designed the car posts back. FANTASTIC! You can bet if I posted something about this years Mclaren F1 car Adrian Newey wouldn't reply!!!!!!

I agree Erik, only a snapshot at a given travel and it also does not take into account roll bars etc, just a simple tuning tool for getting into the ballpark. I did notice that some of the positions are significantly more progressive. I was also suprised that, for a given tower and wishbone position how much stiffer the rear is relative to the front. No wonder this thing has so much front grip!

I would love to know the real figures from the model Erik but I'm guessing there confidential!

Anyhow, great car
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Old 09-22-2004, 09:29 AM   #7579
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hi

orderd ceramic nitride diff balls from acer bout 2 half week ago and still have not recieved them yet in the uk has any1 else had this problem.

also everytime i try to email them and say something they dont reply.
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Old 09-22-2004, 01:19 PM   #7580
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Spud-

Just a quick question, but i was wondering why you only use X-ray and associated springs?

The reason I ask is due to the lack of consistency in the industry. A 20lb spring from losi might be a little different then a 20lb spring from HPI. The width, lenght, and lbs will all differ slightly.

I assume that you run either X-ray or Associated springs on all of your cars...

The spreadsheet is great and filled with alot of information...any chance you could e-mail them to me?
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Old 09-22-2004, 03:23 PM   #7581
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Artwork,

I always used to use Associated dampers on my Schumacher and so had lots of Associated springs. Since then I've found that the Xray ones are really accurate so have started to mainly use them and sometimes the Associated ones to give a broader range. I'm sure the HPI ones are good too but I now have plenty more than I need!

You are right, there are some differences between manufacturers. Length and width should not be a problem, provided they fit your dampers correctly and you can set ride heights ok. The most important thing is that you always use a matched pair of springs on a given axle. Thats where I found the Xrays are very good - closer match and makes it much easier to set the car up.

The easisest way to compare one spring to another is simply put them together end to end and compress them. You'll soon see which is softer as it will go coilbound first.

I'll e-mail the excel file to you tomorrow artwork
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Old 09-22-2004, 07:57 PM   #7582
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spud_J do the xray adjustable dampners fit the pro4 like the stock shocks or do you have modify them.
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Old 09-22-2004, 08:01 PM   #7583
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Don't forget to match your inserts too.

Since inserts are also part of the suspension.

Same method with springs, I push 2 inserts together to see if they both crumple evenly. Basically I dun make a fuss about it as long as the front inserts match and rears match too. At best, all front and rear inserts crumple equally.
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Old 09-23-2004, 01:55 AM   #7584
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sportsracer,

To be honest I dont know! I just use the Xray springs on the HPI dampers (shocks) sorry I'm British I call them dampers!

I think the HPI dampers on the Pro4 are the best I've ever used
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Old 09-23-2004, 02:02 AM   #7585
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Quote:
Originally posted by Spud_J
sportsracer,

To be honest I dont know! I just use the Xray springs on the HPI dampers (shocks) sorry I'm British I call them dampers!

I think the HPI dampers on the Pro4 are the best I've ever used
Ain't that bad... some japs call them dumpers... LOL
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Old 09-23-2004, 07:59 PM   #7586
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I misplaced my rear sway bar holder, does anyone know if I can buy it seperatley or do I have to buy the whole diff case?
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Old 09-24-2004, 03:19 AM   #7587
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if anyone wants a pro4 rollout sheet with all the caluclations pm me. i can't post it on this board, it doesn't let me post xcel files
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Old 09-24-2004, 05:30 AM   #7588
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VenomWorldOrder: email it to me and I'll make a PDF out of it and post.

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Old 09-24-2004, 07:23 AM   #7589
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Here ya go!
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Last edited by Tres; 07-10-2008 at 03:23 PM.
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Old 09-24-2004, 07:32 AM   #7590
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Quote:
Originally posted by Tres
VenomWorldOrder: email it to me and I'll make a PDF out of it and post.

tres@tresleonard.com
ok done just place the details i included on the email on the pdf and on the xcel sheet as i didn't do it.
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