Increasing rear grip...options?
#43
One difference between the two cars is that the street car seems to have a bit more suspension travel.
#44
Yeah, I guess I was being a little sarcastic. I think your entire problem is that you're hitting the rear bump stop under power. It's worse with the more powerful car because the rearward weight transfer is greater so you're hitting the stop sooner/harder.
I know that people riding around on the street with soft springs take it for granted that they'll be on the bumpstops when they get frisky so they tune them front/rear to balance things. I can't help much with that, but adding the packers to the front will cause the front bumpstops to engage earlier and supposedly bring some balance. I'm not qualified to tell anyone the best way to set up a car for track, but I'm pretty sure that's not it.
The ISC top hats helped increase rear wheel travel. Great. I would try raising the rear ride height to increase available travel even more. I know it goes against what Andrew suggested, but I'd give it a try anyway. He won't know if you don't tell him.
I know that people riding around on the street with soft springs take it for granted that they'll be on the bumpstops when they get frisky so they tune them front/rear to balance things. I can't help much with that, but adding the packers to the front will cause the front bumpstops to engage earlier and supposedly bring some balance. I'm not qualified to tell anyone the best way to set up a car for track, but I'm pretty sure that's not it.
The ISC top hats helped increase rear wheel travel. Great. I would try raising the rear ride height to increase available travel even more. I know it goes against what Andrew suggested, but I'd give it a try anyway. He won't know if you don't tell him.
#46
I figured I'd update this again. Since the last track day I added 3mm packers up front, lowered the rear of the car slightly and took off the Star Specs and installed the Yoke AD08's. I went to Pittrace to do a trackcross. In September the temp was mid 70's and the car was really loose. This weekend the temp was 45 and cloudy with gusty wind and the track lacked grip. Surprisingly after a couple laps the Yokes warmed up enough to provide adequate grip. The car seemed easy to control and wasn't prone to over rotation as in the past. Overall I was pleased with the feel of the car and was able to drop my times by 3 seconds compared to September. Even though I made more changes over the last month than just tires, I was impressed by the grip the AD08's held in the cold.
#47
I figured I'd update this again. Since the last track day I added 3mm packers up front, lowered the rear of the car slightly and took off the Star Specs and installed the Yoke AD08's. I went to Pittrace to do a trackcross. In September the temp was mid 70's and the car was really loose. This weekend the temp was 45 and cloudy with gusty wind and the track lacked grip. Surprisingly after a couple laps the Yokes warmed up enough to provide adequate grip. The car seemed easy to control and wasn't prone to over rotation as in the past. Overall I was pleased with the feel of the car and was able to drop my times by 3 seconds compared to September. Even though I made more changes over the last month than just tires, I was impressed by the grip the AD08's held in the cold.
#48
Just so I got this straight......you've ignored every suggestion from qualified persons, made your own changes based upon anecdotal evidence suggested by local dirt track racers....and finally noted that tires up to "temp" made the car predictable......yet no use of tire temp gauge......on a short course where speed and cornering forces are limited...
You must be a colossal idiot.
You must be a colossal idiot.
#49
Just so I got this straight......you've ignored every suggestion from qualified persons, made your own changes based upon anecdotal evidence suggested by local dirt track racers....and finally noted that tires up to "temp" made the car predictable......yet no use of tire temp gauge......on a short course where speed and cornering forces are limited...
You must be a colossal idiot.
You must be a colossal idiot.
Based on what I've read of Emilio's Xida setups he doesn't have much shock travel until the front bumpstops start to engage. That would suck on the street but it seems to work quite well on the track. Looking at the Xida photos you can see the rear bumpstop is quite a bit shorter than the front one. That caused me to conclude that adding a second 3mm packer up front might be beneficial. Adding the ISC tophats in the rear increased travel and seems to have made a difference as well.
Savington, your suggestions seem to have helped, thanks.
Last edited by wannafbody; 10-27-2013 at 10:20 PM.
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