advice on ride height?

[TLSTWIN]

Originally Posted by Justin Moreno

I believe 660mm was what pedders recommended for their suspension. I'm not sure if that was for damper travel or suspension geometry. Different shocks/struts have different optimal heights, which comes from the internal design of the damper, as well as OAL and total damper travel. based on pfadts recommendation in the installation manual for them, the pfadts can go low enough to where your concern should be axle angle, and suspension geometry, not as much damper travel.

Axle geometry, pedders could go much lower also

[JusticePete]

Originally Posted by KRich2587

how about on 19s or 18s?

1" = 25mm
19" 12.5mm shorter ADD 12.5 mm to the measurement 672.5mm
18" 25mm shorter ADD 25mm 685mm

Originally Posted by Justin Moreno

Pfadt recommended 29-29.25" from the ground to the fender with 28.7" OD tires. Yours are 27.9" so they would say 28.6-28.85" for you. I would stay on the high side of that for shock travel especially in the rear

Measuring from the ground to the fender introduces tire aspect ratio, inflation and tread wear into the measurement. Measuring from a fixed point on the rim eliminates all three.

Originally Posted by Justin Moreno

I believe 660mm was what pedders recommended for their suspension. I'm not sure if that was for damper travel or suspension geometry. Different shocks/struts have different optimal heights, which comes from the internal design of the damper, as well as OAL and total damper travel. based on pfadts recommendation in the installation manual for them, the pfadts can go low enough to where your concern should be axle angle, and suspension geometry, not as much damper travel.

That said, there are many people running at 650mm with no axle issues.

If you road course or drive very fast in a straight line the shaft angle increase with lowered ride heights increase the operating temperature of the CV joints. High quality synthetic lube is more resistant to liquifying under these high heat loads. Shaft angle is a concern.

At ride heights below 660, the rear suspension upper arm binds. There isn't enough upward travel. Driven Danny Popp hard, 675mm in the rear.

[CHMSC]

One of the most challenging parts to setting ride height is finding a surface that is truly level. If you can find a good level surface that is ideal for setting ride height. If this is a track only car I would recommend not screwing with the settings to much and just take it to get corner balanced and tell them the ride height range you would like to be at and let them deal with it.

[JusticePete]

Originally Posted by CHMSC

One of the most challenging parts to setting ride height is finding a surface that is truly level. If you can find a good level surface that is ideal for setting ride height. If this is a track only car I would recommend not screwing with the settings to much and just take it to get corner balanced and tell them the ride height range you would like to be at and let them deal with it.

An alignment rack works well.

There is minimal adjustment required when corner weighting a 1LE. They did a great job at the factory.



Long story short, you'll be very close with the ride heights discussed.

[dvanderk]

Originally Posted by TLSTWIN

yep

I am at 660 on all 4 corners

Thanks for the info on that, I was curious about the recommended metrics for that.

[CHMSC]

Originally Posted by JusticePete

An alignment rack works well.

There is minimal adjustment required when corner weighting a 1LE. They did a great job at the factory.



Long story short, you'll be very close with the ride heights discussed.

I set my ride height at the aligment guys shop, like you said.

Pete, how is the corner weight of and SS? I know you have done 1 or 2 of those.

[JusticePete]

Originally Posted by CHMSC

I set my ride height at the alignment guys shop, like you said.

Pete, how is the corner weight of and SS? I know you have done 1 or 2 of those.

Within 15 pounds a corner. The 5th Gen is a great car from the factory.

[CHMSC]

Originally Posted by JusticePete

Within 15 pounds a corner. The 5th Gen is a great car from the factory.

cool Pete

[Moreno1]

Originally Posted by JusticePete

At ride heights below 660, the rear suspension upper arm binds. There isn't enough upward travel. Driven Danny Popp hard, 675mm in the rear.

I wouldn't doubt that. upper arm travel was something we had to consider while fabricating the tubular rear cradle.

Raising the car to 675mm is surprising though. Makes me wonder what the ride height is on the grand am cars. As I understand it, they are not allowed to modify suspension arms, and they seem pretty low from the pictures I have seen.

[TLSTWIN]

Originally Posted by Justin Moreno

I wouldn't doubt that. upper arm travel was something we had to consider while fabricating the tubular rear cradle.

Raising the car to 675mm is surprising though. Makes me wonder what the ride height is on the grand am cars. As I understand it, they are not allowed to modify suspension arms, and they seem pretty low from the pictures I have seen.

Not to mention they are already running 18" wheels, so they are already at a lower cg

[JusticePete]

The Z/28 is wearing OE fender skirts.

[Moreno1]

Originally Posted by JusticePete

1" = 25mm
19" 12.5mm shorter ADD 12.5 mm to the measurement 672.5mm
18" 25mm shorter ADD 25mm 685mm

Why add? should be shorter distance from fender to wheel lip if you go down in wheel size.

These are the pics I am referring to. Granted they have the flares, but still, looks pretty low. this is on 25.5" tires and 18" wheels.

[VR Baron]

Originally Posted by JusticePete

An alignment rack works well.

There is minimal adjustment required when corner weighting a 1LE. They did a great job at the factory.



Long story short, you'll be very close with the ride heights discussed.

Pete, so with 660mm allaround, is that also the best for the corner balance for the SS as well? Or does it matter as it isnt as close as the 1le? And does corner balancing do anything for auto x?

[JusticePete]

Originally Posted by Justin Moreno

Why add? should be shorter distance from fender to wheel lip if you go down in wheel size.

These are the pics I am referring to. Granted they have the flares, but still, looks pretty low. this is on 25.5" tires and 18" wheels.

My ride heights are based on 20" so to adjust them for use on a smaller wheel you add.

If you tuck the rear wheels with a ride height lower than 660 the upper arm will bind and the car will become unsettled crossing gator backs.