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SCCA ESP Thread

SteveW

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Thank you for chiming in here, Conedodger! Yeah, what you say about the dynamics is exactly what is going on. Another thing I noticed is on a couple runs back at a TnT when I played around with higher front compression settings. I got loads of corner entry push that way and I wonder if the rear Torsen has something to do with that. Higher front compression should yield less weight transfer forward, keeping more weight on the rear wheels that the Torsen keeps locked together, which would make turn-in more difficult.

My car feels best right now with minimal front compression settings and rear shocks set very high on grippy surfaces.
 

dontlifttoshift

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. Higher front compression should yield less weight transfer forward, keeping more weight on the rear wheels that the Torsen keeps locked together, which would make turn-in more difficult.

My car feels best right now with minimal front compression settings and rear shocks set very high on grippy surfaces.
Shocks can not control how much weight transfers, they can control the _speed_ at which that weight transfers.

Too much front compression will overload the tires too fast and the car will continue to push until you unwind the steering wheel.

Strano worded it best. Compression controls the wheels (unsprung weight) and rebound controls the body (sprung weight). You want just enough compression to keep the wheels from skipping off of bumps.
 

Simmons-Racing

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I can't wait to try ESP tomorrow at the Wilmington PRO

The car felt ok making the turn after the practice starts.......not much traction off the line though.

Simmons
 

Conedodger

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Thank you for chiming in here, Conedodger! Yeah, what you say about the dynamics is exactly what is going on. Another thing I noticed is on a couple runs back at a TnT when I played around with higher front compression settings. I got loads of corner entry push that way and I wonder if the rear Torsen has something to do with that. Higher front compression should yield less weight transfer forward, keeping more weight on the rear wheels that the Torsen keeps locked together, which would make turn-in more difficult.

My car feels best right now with minimal front compression settings and rear shocks set very high on grippy surfaces.
The OS fixes the I got, I got it, I don't got it characteristic of the car so you may want to look into that.

FWIW I run very little compression in front as well. OTOH I need more rear compression. Working on that next weekend.
 

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Simmons-Racing

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Having an issue after a spin during a run at the Wilmington Pro. ABS, stability control and advance track lights came on and I had no ABS for the next two runs. Tried disconnecting the battery for a bit, but no luck. Also tried to refresh the tune but that also didn't work.

Now on the drive home, the wrench icon came on and the engine was cutting out. After a restart, the wrench icon went out, but the other lights remain on. Have about 430 miles to go yet, anyone have any ideas?
 

SteveW

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I noticed you're using a teeny battery and this might be a long shot but do you have a larger one with you? Maybe the car isn't getting good clean power and the electronics are acting screwy.

Batteries are like capacitors in a way and filter noise. Noise on the power feeding electronics isn't good for their performance. Again, long shot idea and wouldn't really have anything to do with it occurring after a spin.
 

Simmons-Racing

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I noticed you're using a teeny battery and this might be a long shot but do you have a larger one with you? Maybe the car isn't getting good clean power and the electronics are acting screwy.

Batteries are like capacitors in a way and filter noise. Noise on the power feeding electronics isn't good for their performance. Again, long shot idea and wouldn't really have anything to do with it occurring after a spin.
There is a possibility that's it.

It just seemed to happened right after the spin.

Hopefully I make it home.

Simmons
 

DickR

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There is a possibility that's it.

It just seemed to happened right after the spin.

Hopefully I make it home.

Simmons
Did the car stall as part of the spin? If the battery is marginal a restart might have pulled the voltage down permanently.

Can you read the battery voltage on the instrument panel display? Mine tends to read low compared to a meter on the battery terminals but the lowest normally after being off for a day or more is 11.7 volts with ignition on and engine not running. Charging with the engine/alternator typically goes up to around 14.2 on the display as I recall and drops to 13.7 or so. Numbers approximate!

PM me if you get stranded anywhere near Chambersburg, OH tonight.

Dick
 

Simmons-Racing

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Did the car stall as part of the spin? If the battery is marginal a restart might have pulled the voltage down permanently.

Can you read the battery voltage on the instrument panel display? Mine tends to read low compared to a meter on the battery terminals but the lowest normally after being off for a day or more is 11.7 volts with ignition on and engine not running. Charging with the engine/alternator typically goes up to around 14.2 on the display as I recall and drops to 13.7 or so. Numbers approximate!

PM me if you get stranded anywhere near Chambersburg, OH tonight.

Dick
It didn't stall.... I ran a 39 with the spin.

We are in the middle of PA right now.
 

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SteveW

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What if during the spin you kicked up a piece of opr that damaged a wheel speed sensor wire?

Nice job grabbing a trophy spot, btw!
 

Norm Peterson

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Higher front compression should yield less weight transfer forward
Not so sure about this - higher front compression means more forward load transfer is passing through the struts during most of the time that the suspension is still compressing. Transient.

You wouldn't overshoot as far, so the peak load transfer through the springs when the suspension is about to rebound would be lower. But only briefly.


Norm
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