76LikesRC Crew Chief Software
12-25-2015, 07:44 PM
#571
When you change the upper shock position the change to droop should be very small. Moving the lower shock mount inward or outward will certainly have more of an effect.
I'm working on shock modelling now which will require more details of the shock geometry and stroke to be included. Shouldn't be to much problem to include something to calculate the shim thickness required to maintain consistent droop. I'll add it to the list.
I'm working on shock modelling now which will require more details of the shock geometry and stroke to be included. Shouldn't be to much problem to include something to calculate the shim thickness required to maintain consistent droop. I'll add it to the list.
01-08-2016, 06:12 AM
#573
Bob,
Happy New Year to you as well! Thanks for Xray T4 '16 car files, very timely.
T4 has this option to move any of diffs slightly up or down. Housing is slightly eccentric I assume and you can rotate it to either tighten belt or move diff itself up or down. Is there a way to simulate this in your software? And do you know what it does? In handbook it says how it affects handling, but I am wandering - is it just because it shifts weight up or down or it's something more. I can't imagine what else it could affect rather than just weight center.
Happy New Year to you as well! Thanks for Xray T4 '16 car files, very timely.
T4 has this option to move any of diffs slightly up or down. Housing is slightly eccentric I assume and you can rotate it to either tighten belt or move diff itself up or down. Is there a way to simulate this in your software? And do you know what it does? In handbook it says how it affects handling, but I am wandering - is it just because it shifts weight up or down or it's something more. I can't imagine what else it could affect rather than just weight center.
01-08-2016, 07:58 AM
#574
Thanks for the update Bob.
01-09-2016, 05:23 PM
#575
Bob,
Happy New Year to you as well! Thanks for Xray T4 '16 car files, very timely.
T4 has this option to move any of diffs slightly up or down. Housing is slightly eccentric I assume and you can rotate it to either tighten belt or move diff itself up or down. Is there a way to simulate this in your software? And do you know what it does? In handbook it says how it affects handling, but I am wandering - is it just because it shifts weight up or down or it's something more. I can't imagine what else it could affect rather than just weight center.
Happy New Year to you as well! Thanks for Xray T4 '16 car files, very timely.
T4 has this option to move any of diffs slightly up or down. Housing is slightly eccentric I assume and you can rotate it to either tighten belt or move diff itself up or down. Is there a way to simulate this in your software? And do you know what it does? In handbook it says how it affects handling, but I am wandering - is it just because it shifts weight up or down or it's something more. I can't imagine what else it could affect rather than just weight center.
Anyone have an explanation?
01-09-2016, 05:36 PM
#576
I have wondered as well how raising/lowering the diffs would affect handling. There would be a slight change in CG height but it would be very small. Could possibly be some gyroscopic effect as the diffs are spinning at high RPM. I'll do some research.
Anyone have an explanation?
Anyone have an explanation?
01-09-2016, 06:16 PM
#577
I know a partial explanation, lol, can't remember all the physics that were explained to me by a mech. engineer and setup guru. It has to do with the angle of the dogbones going into the diff outdrives. Which affects the 'dogbone plunge', or how much the drive pins move in/out as the suspension travels. The more the pins move, the more they 'bind up' when getting on power. This gives more traction and plants that end of the car more. I think that was how it was explained to me, lol.
01-10-2016, 03:05 PM
#578
Interesting explanation.
If there is a big difference in the vertical axle angle I can see the argument for binding. I remember in my NTC3 there was an offset in the fore aft direction between the centreline of the diff and wheel axles. The misalignment was bad enough that the dog bone pin working back and forth would wear a notch in the diff outdrives. When the notch got big enough you got some real binding.
I'll have to try this out sometime. Won't be something I'll be able to quantify in RC3 though.
If there is a big difference in the vertical axle angle I can see the argument for binding. I remember in my NTC3 there was an offset in the fore aft direction between the centreline of the diff and wheel axles. The misalignment was bad enough that the dog bone pin working back and forth would wear a notch in the diff outdrives. When the notch got big enough you got some real binding.
I'll have to try this out sometime. Won't be something I'll be able to quantify in RC3 though.
01-10-2016, 07:45 PM
#579
Interesting explanation.
If there is a big difference in the vertical axle angle I can see the argument for binding. I remember in my NTC3 there was an offset in the fore aft direction between the centreline of the diff and wheel axles. The misalignment was bad enough that the dog bone pin working back and forth would wear a notch in the diff outdrives. When the notch got big enough you got some real binding.
I'll have to try this out sometime. Won't be something I'll be able to quantify in RC3 though.
If there is a big difference in the vertical axle angle I can see the argument for binding. I remember in my NTC3 there was an offset in the fore aft direction between the centreline of the diff and wheel axles. The misalignment was bad enough that the dog bone pin working back and forth would wear a notch in the diff outdrives. When the notch got big enough you got some real binding.
I'll have to try this out sometime. Won't be something I'll be able to quantify in RC3 though.
01-13-2016, 01:22 PM
#580
This is what Yokomos designer said about the lowering of the Diffs
So it is gyroscopic effects they are trying to reduce. To reduce the gryo they reduce the diameter of the diff pulleys this also allowed the diffs to be lowered 3mm which helps lower the CG. Yes that changes the angle of the axles but I don't believe it has anything to do with binding. They are doing everything possible to lower the CG, reduce the rotating mass, and minimize gyroscopic effects. That all makes sense to me.
Here is the page link
https://www.teamyokomo.com/product/o...rtc_bd716.html
The front and rear drive pulley was reduced 6 mm and the drive axel was lowered 3mm. This reduces the gyro effect caused by rotating parts when racing (the effect will be less changes direction of the rotation axis), especially due to better movement of the roll direction, sharp crosscutting and cornering become possible. The throttle response is also improved by the weight of the pulley. Acceleration and electric efficiency has also improved during escape at the corner.
Here is the page link
https://www.teamyokomo.com/product/o...rtc_bd716.html
01-21-2016, 11:46 AM
#583
This is what Yokomos designer said about the lowering of the Diffs
So it is gyroscopic effects they are trying to reduce. To reduce the gryo they reduce the diameter of the diff pulleys this also allowed the diffs to be lowered 3mm which helps lower the CG. Yes that changes the angle of the axles but I don't believe it has anything to do with binding. They are doing everything possible to lower the CG, reduce the rotating mass, and minimize gyroscopic effects. That all makes sense to me.
Here is the page link
https://www.teamyokomo.com/product/o...rtc_bd716.html
So it is gyroscopic effects they are trying to reduce. To reduce the gryo they reduce the diameter of the diff pulleys this also allowed the diffs to be lowered 3mm which helps lower the CG. Yes that changes the angle of the axles but I don't believe it has anything to do with binding. They are doing everything possible to lower the CG, reduce the rotating mass, and minimize gyroscopic effects. That all makes sense to me.
Here is the page link
https://www.teamyokomo.com/product/o...rtc_bd716.html
01-21-2016, 02:12 PM
#585
In a completely anecdotal way, I have found moving the diffs up or down to be a lot like changing the roll center. Lowering the diffs got the car more "into" the track, raising them freed the car up. This was with the TC5 that had different cams for this purpose.
I may be totally wrong
I may be totally wrong