antisquat %, IC height & length discussion - S197 mustang

[crownaviation]

Any change in the 60" time?

Wow I did not think those bushings would move that much... They moved like an inch on each shift...

 

[Dubstep Shep]

I'd be interested to see some videos like that with a Torque Arm...

 

[2011/5.0]

I was calculating with unknown front to rear weight I know total is 3760 so i just put 200lb extra in front figures out at 83.44% But if I lower lca rear 1 hole it comes out at 105.34% no 60ft times yet should I drop it one or wait till I get a test day in thanks

 

[2011/5.0]

antisguat % 83.44
ic length 46.75
ic height 8.01
spring front bmr sp-011
spring rear bmr sp012
airbag no
ride height front 28.25
ride height rear 28.75
tire dia front 27
tire dia rear 27.8
strut f strange single
shock rear strange single
wheel base 107.1
center gravity 22
lca relo yes bmr
lca position top hole
uca bracket rousch anti hop
uca hole na
pinion angle -1

 

[BMR Tech]

antisguat % 83.44
ic length 9
ic height 21
spring front bmr sp-011
spring rear bmr sp012
airbag no
ride height front 28.25
ride height rear 28.75
tire dia front 27
tire dia rear 27.8
strut f strange single
shock rear strange single
wheel base 107.1
center gravity 22
lca relo yes bmr
lca position top hole
uca bracket rousch anti hop
uca hole na
pinion angle -1

This does not seem right to me.

If so, this is going to be a very hard set-up to "control" with only 9" IC length.

Is that 9" IC length an error?

 

[2011/5.0]

Lol. Probably i will double check ----FIXED

 

[2011/5.0]

first test after setting lca top hole in relo bracket da 1100/1600
60 1.60
330 4.73
1/8 7.33@ 94.3 mph
1000 9.59
1/4 11.49@ 118.26 mph 1100da

backed up with 11.502 @118.49 1.61 60ft 1600da

hope to take some video next test session of launch

 

[BMR Tech]

OH YEAH!

 

[daveyboy]

How do you get that string placement accurate? I might try this

 

[BMR Tech]

Not sure how he did it.

I assume, as easy as taking the measurements then taping them to the wheels.

Calculator is so much better, IMO.

Keep in mind, the #'s dont really mean anything to anyone else, except the user. Use the calculator as a tool. It is says 107% AS...then use that as a baseline for testing. It may not actually be 107%....but, it will be close...and you can use that # to either raise, or lower the IC/AS etc.

 

[Norm Peterson]

Better still, Excel


Norm

 

[Falkwa]

just spent the last hour or so reading all this... mind blown lol. and here i thought my tires was most likely worse then they really are haha.

 

[daveyboy]

Finally got my plot done. (i think it is close)

Antisquat %: 71.67
IC length: 50.41
IC height: 7.31
springs front: stock
springs rear: stock
airbag: NO
ride height front: 28.625
ride height rear: 30"
tire dia front: 27.1" (bridgestone)
tire dia rear: 28.5" (Pheonix FX)
strut type front: Stock
strut type rear: stock
wheelbase: 107.1"
center gravity: 21.75"
LCA relocation brackets: no
LCA position: stock
UCA bracket: YES, METCO
UCA position: lower hole



So what can I do to help this? To give you an idea what my car was doing last weekend...

 

[BMR Tech]

Bias ply auto car?

Lower the car. (I recommend our SP068 drag springs)

And throw our CAB005 Brackets on it, in the lowest position.

This may work REALLY well initially, or it may suck.

If it sucks, then I would pick up some Viking Double Adjustable Shocks.

I am a fan of running as much AS as you can get with our parts, but often times it takes a good double adjustable rear shock to make it work right.

 

[Norm Peterson]

You've still got a visible amount of roll from the engine's torque reaction, which means that some of the apparent squat on the RR is actually roll rather than squat that you'd fix with LCA/UCA geometry adjustments. Not that a still lower LCA adjustment wouldn't help, but you might want to consider a stiffer rear sta-bar/swaybar/antiroll bar.

Too bad you don't have a left side picture for comparison.


Norm

 

[daveyboy]

Bias ply auto car?

Lower the car. (I recommend our SP068 drag springs)

And throw our CAB005 Brackets on it, in the lowest position.

This may work REALLY well initially, or it may suck.

If it sucks, then I would pick up some Viking Double Adjustable Shocks.

I am a fan of running as much AS as you can get with our parts, but often times it takes a good double adjustable rear shock to make it work right.

Yes, Bias Ply auto car! What is the diffrence in the spring rate from the stock springs? stiffer or softer? I might add that I am pretty sure I bottomed the suspension out on the right rear on this launch. Pretty hard clunk and lost some traction and then went again. I took a Pound of air out on the next run which seemed to solve that but 60' was.05 slower. I have some LCA relocation brackets (Whiteline...They were free). Would it help to put those in before lowering it? Sorry trying to learn.

You've still got a visible amount of roll from the engine's torque reaction, which means that some of the apparent squat on the RR is actually roll rather than squat that you'd fix with LCA/UCA geometry adjustments. Not that a still lower LCA adjustment wouldn't help, but you might want to consider a stiffer rear sta-bar/swaybar/antiroll bar.

Too bad you don't have a left side picture for comparison.


Norm

Agreed a left side shot would have been nice to see. and thanks for the info

 

[lindertw]

So what can I do to help this? To give you an idea what my car was doing last weekend...

is your front sway bar still in place/hooked up?

 

[daveyboy]

is your front sway bar still in place/hooked up?

No, I remove it when I go to the strip

 

[Noclutch]

Anybody have the measurements for the stock suspension with the stock tire sizes?

The cars are 10 years old now and having this information even though late is a starting point for others to work with before they start to make changes.

The car was not meant for drag racing so we make the needed changes and lots of unwanted ones.

 

[lindertw]

Anybody have the measurements for the stock suspension with the stock tire sizes?

The cars are 10 years old now and having this information even though late is a starting point for others to work with before they start to make changes.

The car was not meant for drag racing so we make the needed changes and lots of unwanted ones.

I think Norm's post might have what you're after.