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Thread: hotchkis rear sway bar

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Posts: 21-22 of 22
2011-03-16 14:39:55
#21
Is the push: mid turn, entry, exit, all?

Do you have shock dynos? And were they valved for your setup? If not I would start there. Also don't mistake feel for ability to go fast.

For reference. On my miata, if I disconnect my rear bar it is good for 1-1.5seconds on a course.... but it FEELS worse. It just has more grip with step out characteristics that don't feel as good. I can change lap times by >2 seconds by messing with shock settings...

Tire pressures? Pyrometer readings? Have you calculated wheel rates, bounce frequency, roll resistance rate, etc? etc etc I should post a tech sheet for you to fill out.
Last edited by wnwright on 2011-03-16 at 14-45-04.
2011-03-21 04:58:38
#22
I totally forgot about this thread!

Originally Posted by awdracer
So I'm reading this and I'm in the process of of installing a big rear bar on my B13. I'm using the same 1.25" Speedway Engineering bar that Kessler installed on Greg's car. I have 600F and 650R springs along with the Koni 8611.

Based on my calculations I'll have adjustability in my new bar from 30% - 200% stiffer than the Progress bar that I am currently running by changing the attachment point on the arm.

Blair, Box, are you guys saying that this is a bad idea?

The problem I'm having is a nasty push in the slower corners and in longer sweepers. On most corners I can turn the car with the brakes but I can't seem to get the car to do anything but push in certain corners.


Scott, your situation is different. What you are doing is exactly what you need to do! I'm betting you need more rear rate though. Have you talked with Kessler? Are you coming up to Mid-O at all this year before nats?


Originally Posted by vqman
subscribing

(oh wait, i started this thread)

would be good to hear what you guys come up with as a solution for his pushing in the corners.


Street cars require alot different school of thought than a race or track only car.

Originally Posted by awdracer

My question is more about rear bar and rear springs. My understanding is that FWD cars like more rear bar. Maybe that is something that I believe b/c I've heard it so many times. Maybe it's true, maybe its not. I'd like to hear some opinions, though.


FWD's do like more rear bar. My car became light years better once I raised my rear rates.

Originally Posted by wnwright
Is the push: mid turn, entry, exit, all?

Do you have shock dynos? And were they valved for your setup? If not I would start there. Also don't mistake feel for ability to go fast.

For reference. On my miata, if I disconnect my rear bar it is good for 1-1.5seconds on a course.... but it FEELS worse. It just has more grip with step out characteristics that don't feel as good. I can change lap times by >2 seconds by messing with shock settings...

Tire pressures? Pyrometer readings? Have you calculated wheel rates, bounce frequency, roll resistance rate, etc? etc etc I should post a tech sheet for you to fill out.


All these questions too. Though i tenf to throw the math out the window. It seems to be more black art than science!

You can't compare rear bar on a rwd and rear bar on a fwd car directly though. Both of my RWD car are taking rear bar out in an effort to put power down, and the FWD cars are all adding it to get rotation.
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