CSG and RCE tag-team suspension Q&A thread! Ask us anything!

[solidONE]

Originally Posted by Dimman

'Competition Car Suspension' by Allan Staniforth.

Target audience seems to be British hill climb racers who build their own open wheel cars.

Because England???

I got these guys... Because sale at barnes and nobles! lol


I need material that's more concentrated on suspension. Those are more general chassis dynamics.

Just to clarify. They were talking about motion ratios, and the photo I put up is calculation for wheel rates.

[Dimman]

Originally Posted by solidONE

I got these guys... Because sale at barnes and nobles! lol


I need material that's more concentrated on suspension. Those are more general chassis dynamics.

Just to clarify. They were talking about motion ratios, and the photo I put up is calculation for wheel rates.

Same topic, really. It's all connected.

(I have the Herb Adams book, too.)

For a pretty in-depth look at the insides of dampers look for 'Race Tech's Motorcycle Suspension Bible' by Paul Thedes and Lee Parks.

Great insight into how the damper curves are generated through orifice size, shims, check valves, bypasses the circuits for high speed and low speed oil flow, etc... Plus a look at the guts on how up to a 4 -way adjustable works (Low and high speed comp and rebound clickers). Plus rebuilding how-to (emulsion and reservoir type rear bike shocks are what best apply to car versions).

Edit:

[autobrz]

Have you had a chance to measure the stock sway bars to figure what their equivalent wheel rates are?

Also, if I wanted to run no rear sway bar for 100% street, canyon driving on moderate grippy tires like RE760, what would you recommend for spring rates?

[Calum]

Originally Posted by OICU812

Ok I know as stock front is zero camber is that really best for wear even spirited driving steady? Common sense leads me to believe not so and then as DD a guy should consider even half a degree to full degree of negative camber up front agree or no?

That's absolutely going to depend on your driving. I've ran -2.7 on the street and had my tires wear even to within a 32nd across the thread. That was a different car mind you, but there wasn't much body roll in it either.

[Wepeel]

Originally Posted by ZDan

I do not agree to disagree! It's not a question of differing opinions, one of us must be wrong! Either offset/scrub radius affects leverage/motion ratios or it does not.

So thanks for making me actually *think* about it a bit
Yer right, changing lateral location of the wheel/tire only increases the lateral loads in the LCA and at the top of the strut, but the leverage/motion ratio between spring and tire is not affected.

Yeah, it's definitely not obvious (as evidenced by the posts following yours ). Takes a little while to think through it.

[Wepeel]

Originally Posted by solidONE

Decreased offset/increased scrub radius DOES increase leverage.



There can only be one!

This isn't a strut.

[Wepeel]

Originally Posted by autobrz

Have you had a chance to measure the stock sway bars to figure what their equivalent wheel rates are?

Also, if I wanted to run no rear sway bar for 100% street, canyon driving on moderate grippy tires like RE760, what would you recommend for spring rates?

Eibach measured the sways to have spring rates of 141 lb/in front, 113 lb/in rear (at the endlink). After you work through the respective motion ratios they contribute 262 lb/in front wheel rate, 79 lb/in rear wheel rate (in roll).

I posted up all my spring, bar, wheel rate and frequency calculations here:
http://www.ft86club.com/forums/showp...&postcount=108

[autobrz]

wow the stock rear total wheel rate is very soft! That number agrees with my feeling driving the car stock.

[Figo]

@Racecomp Engineering, I am still waiting for a good quality Camber Top Mount. Last time I asked you about the issue of Whiteline mount, and u told me that its not fixed. So I did not placed an order.
I have a Cusco strut bar so its seems like all mounts like HVT and Ground control will touch that bar.
So would u plz tell me when those Whiteline mount will be avaliable for sell?

[CSG Mike]

Originally Posted by autobrz

Have you had a chance to measure the stock sway bars to figure what their equivalent wheel rates are?

Also, if I wanted to run no rear sway bar for 100% street, canyon driving on moderate grippy tires like RE760, what would you recommend for spring rates?

Spring rates for stock dampers or coilovers? If coilovers, which coilovers?

[solidONE]

Originally Posted by Wepeel

This isn't a strut.

So wheel rates are calculated differently on a strut suspension? Can you show me the calculation for strut suspension wheel rate?

[autobrz]

Originally Posted by CSG Mike

Spring rates for stock dampers or coilovers? If coilovers, which coilovers?

KW V3?

[Dimman]

Originally Posted by solidONE

So wheel rates are calculated differently on a strut suspension? Can you show me the calculation for strut suspension wheel rate?

It's essentially just the coil rate adjusted for the spring mounting angle.

If you look at a strut the spring and shock are basically locked to the top of the hub since there is no upper pivot. Wheel goes up, strut slides up the same amount.

[CSG Mike]

Originally Posted by autobrz

KW V3?

With stock valving, I'd recommend you stay with the stock rates. You can go a bit softer if you want a more comfortable ride.