Fox Valley Sports Car Club Forum  

Go Back   Fox Valley Sports Car Club Forum > FVSCC Talk > Tech Department

Reply
 
Thread Tools Display Modes
Old 04-12-2012, 05:40 AM   #11
michael85cooper
Junior Member
 
Join Date: May 2009
Posts: 21
Default example

Dave,
I see you have an engineer background

Think about this example and tell me what would happen...

If you have ridged body say a table that has 4 legs

and you put a 1" space under the LF and RR leg

now the other two corners are off the ground but yet you have achived a 1" hight gain at each corner

Do you still think each corner weight is the same?
michael85cooper is offline   Reply With Quote
Old 04-12-2012, 07:53 AM   #12
Dizmm
Administrator
 
Dizmm's Avatar
 
Join Date: Jul 1985
Location: Stevens point WI
Posts: 1,168
Default

If the coilovers have an independent adjustable ride height, and you could raise them all the exact same, your CW's should still be the same. even if they arenít the same, they will be dang close. When I CW cars, on a fine threaded coilovers sleeves, 1 full turn on one corner does not do very much (1 turn on each corner will). On a 2800lb car, it will move maybe 5-6 lbs from the LF/RR to the RF/LR. Youíre talking in the tenths of a percent.

Even if you were serious, and you know your car was 100% CW'd, raising each corner the exact same will still be 95% on.

If you wish to re-CW, send me a PM.
__________________
-Andy Smedegard
Dizmm is offline   Reply With Quote
Old 04-12-2012, 08:43 AM   #13
Supradjza80
Senior Member
 
Supradjza80's Avatar
 
Join Date: Sep 2009
Location: Appleton, WI
Posts: 269
Send a message via AIM to Supradjza80
Default

Quote:
Originally Posted by michael85cooper View Post
Dave,
I see you have an engineer background

Think about this example and tell me what would happen...

If you have ridged body say a table that has 4 legs

and you put a 1" space under the LF and RR leg

now the other two corners are off the ground but yet you have achived a 1" hight gain at each corner

Do you still think each corner weight is the same?
I never said it was not possible to raise a rigid piece of material or potentially a very stiff chassis'd car 1" while at the same time screwing up the corner weights. What I am saying is if you raise the car the SAME amount at EACH corner the weights WILL be the SAME. This conversation is getting old.

Dizmm has the right idea for this situation imo.
__________________


Dave Hanna
UW-Madison Mechanical Engineering

1992 Toyota Supra Turbo 5MT
1991 Audi 200 20V Quattro 5MT
1997 Toyota Supra Turbo 6MT

http://www.youtube.com/user/supradma71
Supradjza80 is offline   Reply With Quote
Old 04-12-2012, 09:08 AM   #14
michael85cooper
Junior Member
 
Join Date: May 2009
Posts: 21
Smile


Last edited by michael85cooper; 04-12-2012 at 11:15 AM.
michael85cooper is offline   Reply With Quote
Old 04-12-2012, 12:34 PM   #15
Supradjza80
Senior Member
 
Supradjza80's Avatar
 
Join Date: Sep 2009
Location: Appleton, WI
Posts: 269
Send a message via AIM to Supradjza80
Default

I thought I replied earlier but actually edited my final post on the first page, not sure if they can restore what I had originally wrote there or not. Andy can you restore post 10 to my original post? Here is my reply to what you originally had above Mike.

Quote:
Originally Posted by supradjza80
No you can't. If you raise each corner exactly 1" the cross weights and individual wheel weights will be the same. It obviously was not raised 1" at each wheel to achieve the results you have found. I am not saying it is easy to do it perfectly, because it is not, but in an ideal test world It will all be the same.
Quoted fully for accuracy. You would also find that the car will list towards the LR or RF in your example so just raising the two corners would not result in the entire car being the correct 1" higher. It will be off. Cars have these things called CG's which are pretty high off the ground, and normally not perfectly centered front to back or Left to Right to begin with.

The only way for you to possibly get your results is to OVER raise the RR and LF while then adjusting the LR and RF very slightly to make the hieghts measured on the chassis correct. This result is not possible if you adjust all the corners in a similar equal fashion which has been discussed this entire time as we are not trying to screw up the corner weights.

Earlier you brought up spring length and K value, again something that if all 4 corners are adjusted equally does not matter (same weights on each wheel), however in your Adjust only 2 legs/wheels example the springs will be more heavily compressed then they were originally (more weight), and therefore the only way to achieve your result AGAIN is to over adjust the coilover collar on the shock body to achieve said result.

And with that I am out of the conversation.
__________________


Dave Hanna
UW-Madison Mechanical Engineering

1992 Toyota Supra Turbo 5MT
1991 Audi 200 20V Quattro 5MT
1997 Toyota Supra Turbo 6MT

http://www.youtube.com/user/supradma71
Supradjza80 is offline   Reply With Quote
Old 04-12-2012, 12:59 PM   #16
michael85cooper
Junior Member
 
Join Date: May 2009
Posts: 21
Smile

[img]http://cdn2-b.examiner.com/sites/default/files/styles/image_full_width/hash/1a/40/1a40e3e995867ab784f16593a19af009.jpeg[img/]

not tring to start something just thinking out side of the box

Yes you can get it close but you could also get it way off
michael85cooper is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Forum Jump


All times are GMT -5. The time now is 04:18 AM.


Powered by vBulletin® Version 3.7.2
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.