Do You Think Is Slipping The Belt???
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Junior
New member
what distance are you running? those are some odd looking timestamps
yammiman
Member
If one was to go on performance alone, you would think you were slipping in the second graph - but if you were to look at your RPM's, I would guess you were slipping in the first graph - if it is like funny car, and top fuel racing, depending on track conditions, slippage can be a good thing - thats my guess!
toydoc
Member
BOTH!
Run 1 slipped the belt, my guess in the drive clutch.
RPM jumped up, jakeshaft slowed.
Run 2 slipped in the driven, hooked hard and sucked the belt down.
Belt sucked down, rpm drops and driven clutch has to wait for the drive clutch to catch up. Like missing a shift and going to 3rd and you wanted 2nd.
Try a little less spring rate in the drive and a little more side pressure in the driven spring.
Just a guess.
Run 1 slipped the belt, my guess in the drive clutch.
RPM jumped up, jakeshaft slowed.
Run 2 slipped in the driven, hooked hard and sucked the belt down.
Belt sucked down, rpm drops and driven clutch has to wait for the drive clutch to catch up. Like missing a shift and going to 3rd and you wanted 2nd.
Try a little less spring rate in the drive and a little more side pressure in the driven spring.
Just a guess.
The Bottom View Is Track Spin With The Engine Rpm Ans Jackshaft Rpm Are The Same. The Top View Has A Dip In The Jackshaft Rpm And A Spike In The Engine Rpm.
yammiman
Member
So did either of us win a turn down the track on that bad boy? LOL
toydoc
Member
If your setup for a 10,000rpm shift (like the first graph).
Wouldn't track spin show both rpm and jackshaft with a spike UP (over 10K) at the same time of the slip.
The bottom graph shows it just touching 10,000 then drops 1000rpm or so.
Looks like it loaded and overshift, then never really got to your 10,000 shift.
Wouldn't track spin show both rpm and jackshaft with a spike UP (over 10K) at the same time of the slip.
The bottom graph shows it just touching 10,000 then drops 1000rpm or so.
Looks like it loaded and overshift, then never really got to your 10,000 shift.
Hay Man, I Will Sign You Up!! 
Lol. You Would Not Think A Yamaha Can Run Those Kind Of Numbers.
With Stock Clutches.
Lol. You Would Not Think A Yamaha Can Run Those Kind Of Numbers.With Stock Clutches.
toydoc
Member
Question for ya.
Are both graphs run with the same clutching, no change?
Are both graphs run with the same clutching, no change?
Toy, Right!! And If The Second Run Was In The Correct Rpm {10,000]
It Would Have Ran In The 5.40s Easy In 660ft.
The Weights We Tryed Loaded The Motor Too Much.
It Would Have Ran In The 5.40s Easy In 660ft.
The Weights We Tryed Loaded The Motor Too Much.
toydoc
Member
Your doing super with yamaha clutching (I gave up on them long ago).
2nd run you lost .017 in the first 60' then gained all back PLUS .001 better at 660'
Second run looks like it dip to 9200 then worked up to 9800rpm.
Almost looks like your motor would run a quicker ET if you started at 9500 then creep up to 9800rpm at the end.
2nd run you lost .017 in the first 60' then gained all back PLUS .001 better at 660'
Second run looks like it dip to 9200 then worked up to 9800rpm.
Almost looks like your motor would run a quicker ET if you started at 9500 then creep up to 9800rpm at the end.
toydoc
Member
I'd keep the the weights in the clutching you had in the 2nd run.
Just work on them to get your 60' time down.
A driven spring with more side pressure and take 1 deg out of the start of the helix angle. Slow the shift for 60' then let it eat, see what happens...
Just work on them to get your 60' time down.
A driven spring with more side pressure and take 1 deg out of the start of the helix angle. Slow the shift for 60' then let it eat, see what happens...
Toy, Well The Sled Is A Buddy Of Mine And I'm Trying To Help Him.
I Can Tell You This The First Run Has Super Tips, And The Second Run Has.......well...if I Tell I you i will Have To Kill You. Lol
You Would Not Believe Me If I Told You.
I Can Tell You This The First Run Has Super Tips, And The Second Run Has.......well...if I Tell I you i will Have To Kill You. Lol
You Would Not Believe Me If I Told You.
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toydoc
Member
LOL!! I get it..
it's on a need to know, and I don't need to know.
It might just be me looking to much at the graph, but..
Does the first run almost look TO flat at 10,000?
Almost like it's hit a wall and wouldn't rev any higher?
it's on a need to know, and I don't need to know.
It might just be me looking to much at the graph, but..
Does the first run almost look TO flat at 10,000?
Almost like it's hit a wall and wouldn't rev any higher?