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

[Racecomp Engineering]

There is no magic number! No magic. Just physics and compromises. 15 mm is "safe" but it isn't magic.

I just don't like seeing the word magic in suspension discussion.

- Andy (posting from the airport)

[37]

Originally Posted by Racecomp Engineering

A single adjustable or even non-adjustable shock honestly can be almost as good if they are valved right from the start.

On that point, how are the Tarmac Zeroes valved compared to stock? The stock seems bouncy to me and I'd love to add some rebound damping and gain inner wheel clearance. If I don't go with the R&T, the T0 is my next step down. If the T0 gets me 90% there for 1/3rd the price then it gives me back some money for brakes.

The car is 98% street, 2% track day. My schedule doesn't allow me much track time these days.

Originally Posted by Racecomp Engineering

I just don't like seeing the word magic in suspension discussion.

JIC Magic.

[Racecomp Engineering]

Originally Posted by 37

On that point, how are the Tarmac Zeroes valved compared to stock? The stock seems bouncy to me and I'd love to add some rebound damping and gain inner wheel clearance. If I don't go with the R&T, the T0 is my next step down. If the T0 gets me 90% there for 1/3rd the price then it gives me back some money for brakes.

The car is 98% street, 2% track day. My schedule doesn't allow me much track time these days.

Much more damping than stock. 98% street sounds like a good fit.

Originally Posted by 37

JIC Magic.

My least favorite kind of magic.

- Andy

[solidONE]

Originally Posted by Dezoris

I have been on sticky 225 and 235 RS3 with -1.5 up front on stock suspension and even heavy autocross I can correct wear with pressures.

Were you able to avoid the tires from rolling over? what pressures were you running? I found that anything over 37-38 PSI hot on the RS3's grip feels compromised. at 40PSI hot, it felt really squirrely when I was at buttonwillow.

[448hpsti]

Seems high for pressures

[OICU812]

Originally Posted by BRZ NA

How about 1.25" to 1.5" drop? will it lost bump travel? so what's the Max can u lowered so that it won't need to regain lost of bump travel?

This... I've wondered this as well if using for example ground control top hats front and robi specs back plates would that have any benifit for those that are only going an inch to inch quarter to inch and half drop very tops. Where would those kinda of stroke adding products really benifit at what drop should a person even worry or consider such items like this to improve their suspension??

[solidONE]

Originally Posted by 448hpsti

Seems high for pressures

RS3 have soft sidewalls. I settled on 36psi hot all around in the later sessions. With about only -1.5 of camber at stock height they were rolling over the shoulders of the tires pretty good. Nemo camber...

[CSG Mike]

Originally Posted by BRZ NA

How about 1.25" to 1.5" drop? will it lost bump travel? so what's the Max can u lowered so that it won't need to regain lost of bump travel?

Whatever distance you drop is the amount of bump travel you lose. If you want to retain all factory bump travel, you need to retain factory ride height.

[CSG Mike]

Originally Posted by whataboutbob

I was just thinking about how it might be useful to characterize the camber/toe changes that result from various levels of suspension compression. Thoughts?

I believe bump steer was measured, although I don't remember the thread.

The front effectively has no toe change, while the rear gains about 1/16" in toe-in per side per inch dropped (and toes out about 1/16" per inch raised), if I remember the figures correctly.

[CSG Mike]

Originally Posted by ultra

Also curious to know whether being able to have more than 2degrees of camber up front will increase front grip on street tires (driven on street, autoX & track).

It sure will.

We run -3 based on pyrometer and wear patterns with 225 street tires. However, YMMV, depending on your setup.

[CSG Mike]

Originally Posted by Dezoris

So 15mm drop is this magic number thrown around where did this come from? Is that the farthest you can go on stock suspension geometry without negative effects?

Any drop will have negative effects, with compounding results for a larger drop. Generally, static RCA products typically start for 30mm drops, although it varies by platform.

Our car runs about 35mm drop without any geometry correction, but we also run fairly high spring rates. (10k/12k, and 12k/15k at times)

[dabocx]

Originally Posted by Racecomp Engineering

The Stance ones are interesting to me but I have not tried them. Off the top of my head for a given ride height you would get more bump travel and less droop travel. Overall a good thing.

- Andy

Whats are the negatives to those LCAs?

[CSG Mike]

Originally Posted by 448hpsti

Seems high for pressures

Pressures are best adjust via pyrometer readings. As @solidONE stated, RS3s tend to like higher pressures.

[whataboutbob]

Originally Posted by CSG Mike

I believe bump steer was measured, although I don't remember the thread.

The front effectively has no toe change, while the rear gains about 1/16" in toe-in per side per inch dropped (and toes out about 1/16" per inch raised), if I remember the figures correctly.

Any info on camber?