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Old 06-12-2013, 01:24 PM   #331
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So just the ends of the bumper or does anyone cut out more
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Old 06-12-2013, 01:45 PM   #332
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Hey guys:
Always the outside rear or fronts. The insides to middle will wear as they wish based on chassis camber and track so we can't count on the inner measurement. For example, you may start with a trued tire with 1 degree of cut camber and by the time your done running it, the tire has 3 degrees of camber cut into the foam. Right? The more valid variable is the outer part of the tire.

I'll take a #3 and a Pepsi
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Old 06-12-2013, 02:29 PM   #333
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Paulie B, you are running 4% overdrive?
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Old 06-12-2013, 02:52 PM   #334
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I just checked the internal gearing for the 977. This is what i found: Rear pulley 48/21, side pulleys 19/25, front pulleys 18/28.

If you use a 4% overdrive ratio, it results in an 8.2mm split, a 3% is 8.8mm split and 2% is 9.5mm split, and 1% is 10.2mm split.

Any split between 8 to 10 mm gives a positive overdrive.

What percentage overdrive do you guys usually run?

With that in mind, what do you setup your ride height to be when you have a 3% overdrive ratio for example. (i.e. 8.8mm split)??

Info corrected below

Last edited by dougday; 06-13-2013 at 08:05 AM. Reason: incorrect info
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Old 06-13-2013, 06:32 AM   #335
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977 Overdrive.pdf

Drive Calc Screen dump.pdfOK you've got my head spinning now , I've put the new pulley tooth counts into one of my old excel overdrive charts and have a completely different conclusion than both Paul and Doug , as a cross check I found the old Serpent drive calculator (had it in my file system could not find it on the Serpent site but then again it might be there and I just ran out of patience looking ) and it agrees with my calculations - discuss.
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Old 06-13-2013, 07:46 AM   #336
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Attachment 1078606

Attachment 1078607OK you've got my head spinning now , I've put the new pulley tooth counts into one of my old excel overdrive charts and have a completely different conclusion than both Paul and Doug , as a cross check I found the old Serpent drive calculator (had it in my file system could not find it on the Serpent site but then again it might be there and I just ran out of patience looking ) and it agrees with my calculations - discuss.
I found the Serpent Drive calculator and it came to the same conclusion as Rick. My spreadsheet must be faulty. 7 split is fine then
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Old 06-13-2013, 08:37 AM   #337
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I found the Serpent Drive calculator and it came to the same conclusion as Rick. My spreadsheet must be faulty. 7 split is fine then
Thanks Doug _ I was about to start digging in my desk for the aspirin
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Old 06-13-2013, 09:33 AM   #338
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Just finishing my 977 up and 252 front track width is no problem but 265-266 is the narrowest i can get rear.... was 270 by stock (manual) settings. i have capricorn tires
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Old 06-13-2013, 12:23 PM   #339
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Link to the Serpent Drive Calculator

http://www.serpent.com/product/803009/downloads/
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Old 06-13-2013, 12:33 PM   #340
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Thanks Doug _ I was about to start digging in my desk for the aspirin
Thanks Rick...I thought I missed a memo....
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Old 06-13-2013, 07:39 PM   #341
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Quote:
Originally Posted by Rick Davis View Post
Attachment 1078606

Attachment 1078607OK you've got my head spinning now , I've put the new pulley tooth counts into one of my old excel overdrive charts and have a completely different conclusion than both Paul and Doug , as a cross check I found the old Serpent drive calculator (had it in my file system could not find it on the Serpent site but then again it might be there and I just ran out of patience looking ) and it agrees with my calculations - discuss.
No head-spinning please....reminds me of the Exorcist.

OK so plugging in the numbers, in order achieve a 1.000 drive ratio, please tell me what number you come up with. I know what I come up with myself and I know what my memo says. It's exactly the same.

I'll call you tomorrow.

Paulie
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Old 06-14-2013, 07:09 AM   #342
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Can someone tell me if i need to run a different tire or what the problem could be
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Old 06-14-2013, 07:10 AM   #343
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Originally Posted by Paulie Bee View Post
No head-spinning please....reminds me of the Exorcist.

OK so plugging in the numbers, in order achieve a 1.000 drive ratio, please tell me what number you come up with. I know what I come up with myself and I know what my memo says. It's exactly the same.

I'll call you tomorrow.

Paulie
Paulie - Both the Serpent drive calculator and my old spreadsheet agree that for a zero overdrive situation the split would be 7.74mm - pretty close to your 8mm number - it wasn't clear to me from your post that you were looking for no overdrive.

Rick Davis
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Old 06-14-2013, 10:25 AM   #344
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Originally Posted by Racermac73 View Post
Can someone tell me if i need to run a different tire or what the problem could be
The offset is wider on the capricorn tires. You may need to change to tires with a different offset. 265mm in the rear is good though
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Old 06-14-2013, 07:05 PM   #345
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Paulie - Both the Serpent drive calculator and my old spreadsheet agree that for a zero overdrive situation the split would be 7.74mm - pretty close to your 8mm number - it wasn't clear to me from your post that you were looking for no overdrive.

Rick Davis
That is correct Rick. For a 1.00 (no overdrive) drive ratio 7.74 (which is why I said 8). I should have been more specific.
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