corner balance/scaling 944 turbo
09-09-2006, 07:00 PM
#17
Racer
Thread Starter
Ok, this is my balance as of today:
774 LF 772 RF
736 LR 670 RR
2945# w/driver 5/8 fuel load
52.4% front, 47.6% rear
51.2% left
51.1% cross
Does this setup look satisfactory?
774 LF 772 RF
736 LR 670 RR
2945# w/driver 5/8 fuel load
52.4% front, 47.6% rear
51.2% left
51.1% cross
Does this setup look satisfactory?
09-09-2006, 07:39 PM
#18
Addict
Rennlist Member
Rennlist Member
Originally Posted by jharding
Do you still have torsion bars in the rear? If not, I am surprised that your car does not understeer badly with that setup.
Originally Posted by RedlineMan
As a for-instance, I run my 26-and-change 84 full coil with 500F/450R. That is 252 effective rear. I run the Ledas about 3-5 clicks stiffer front than rear with Weltmeisters full soft on both ends. It is exceptionally neutral and balanced, with little roll, if slightly slow in the rear.
You may be officially surprised then.
I started with 400F/450R some years ago, and then bumped the front to 500 with virtually no changes to any other tuning point. I had anticipated understeer myself, but it did not arise.
09-09-2006, 07:47 PM
#19
Addict
Rennlist Member
Rennlist Member
Originally Posted by mjensen
Ok, this is my balance as of today:
774 LF 772 RF
736 LR 670 RR
Does this setup look satisfactory?
774 LF 772 RF
736 LR 670 RR
Does this setup look satisfactory?
09-10-2006, 10:43 AM
#20
Racer
Thread Starter
My corner target, I am assuming are the LR to RF weights, 736 LR and 772 RF which was 51.1%. Is this what you mean by "corner target"? Is there any books/resources that would be to my and others benfit to read about chassis/balance set up?
09-10-2006, 11:51 AM
#21
Addict
Rennlist Member
Rennlist Member
Well...
There are the Carroll Smith books, for Rocket Scientists. The Fred Puhn book is pretty elemental and covers the basics well, even though it is quite dated at this point.
You can turn on the scales and see what each corner "weighs." Using the front/rear/side percentages, you can calculate a target weight that reflects what each corner "should" weigh (many computers do this for you). You adjust your corners such that the screen weights approach the target weights, and get as close as you can.
Everyone has a little different way of doing it. If the car works in the end, then it works.
There are the Carroll Smith books, for Rocket Scientists. The Fred Puhn book is pretty elemental and covers the basics well, even though it is quite dated at this point.
You can turn on the scales and see what each corner "weighs." Using the front/rear/side percentages, you can calculate a target weight that reflects what each corner "should" weigh (many computers do this for you). You adjust your corners such that the screen weights approach the target weights, and get as close as you can.
Everyone has a little different way of doing it. If the car works in the end, then it works.
09-10-2006, 01:36 PM
#22
I guess I'll add my stats to the thread.
As seen below I have 450# Leda's on all 4 corners with the following weights with 1/2 tank and 190# driver
753 - LF 740 - RF
722 - LR 723 - RR
I've only had the car out on 2 track days since the coil overs were installed and so far the car feels incredibly well balanced throughout the corner.
Someone had taken a couple of pics of me entering T5 at VIR and although I didn't feel it it looks like there is still some nose dive. I talked to Karl at Racer's Edge and he said I could increase the springs to 550's without having to revalve the shocks. I might do that over the winter after I go through the next several events this fall.
At this point I was thinking of doing the fronts only and I certainly would not think I should have the higher spring rates in the rear...
As seen below I have 450# Leda's on all 4 corners with the following weights with 1/2 tank and 190# driver
753 - LF 740 - RF
722 - LR 723 - RR
I've only had the car out on 2 track days since the coil overs were installed and so far the car feels incredibly well balanced throughout the corner.
Someone had taken a couple of pics of me entering T5 at VIR and although I didn't feel it it looks like there is still some nose dive. I talked to Karl at Racer's Edge and he said I could increase the springs to 550's without having to revalve the shocks. I might do that over the winter after I go through the next several events this fall.
At this point I was thinking of doing the fronts only and I certainly would not think I should have the higher spring rates in the rear...
Last edited by smlporsche; 09-11-2006 at 07:44 AM.
