I should also mention that using Ron Sutton's post run data collection practices has brought awareness to another issue I have with the car that needs to be addressed. Can anyone else pick out the issue?
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Lance
1985 Monte Carlo SS Street Car
Man that does look like a fun course! Glad to hear your changes are working. Thanks for the insight too, I appreciate you sharing the experience.
Quick question on tire pressures- My 275 NT555s on 9.5" wheels seem to like 41 F, 40 R lbs of pressure. I've tried them at lower pressures but the car feels a lot more loose. You've had 3 different tires on this car, the NT555s, the Hoosiers, and now the Falkens. Did you see a big range of pressures between the street, race, and now street/race tires?
Oh yeah, it seems they all like something different. I've been all over the board trying to figure out what it likes.
It is not until you are poking a pyrometer into the treads, outside middle and inside of the tire directly after a run that you really learn what is going on though. The goal is even temps across the tire as you come off the track...this is how you know you have the tire pressures correct.
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Lance
1985 Monte Carlo SS Street Car
We're taking his "Low Roll" strategy to the next level.
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Rod Prouty
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I’m not the smartest guy at the track … but when he goes home … I’m still there testing, tuning, learning & getting faster.
Right side tires are working harder and running hotter. More right turns than left? Left tires unloading in right hand turns?
More left turns that right turns attributed to this, is normal.
Quote:
Originally Posted by Ben@SpeedTech
Right rear tire isn't getting full contact and is heating the outside more than the inside?
Probably because I was leaning on the right rear pretty hard in the last turn off the course, maybe some axle flange flex?
Quote:
Originally Posted by Ben@SpeedTech
Rear brakes are getting hotter than front. Brake bias is off?
Bingo...
I thought it was an anomaly when it first showed at NCM couple weeks ago, attributed it to glazed over front pads and dust shields on the rear. With brand new pads all around and it showed it's ugly head again...it is a pattern.
I think I know what it is, just haven't decided on the cure yet. I still run the factory brake proportioning valve which holds a little pressure on the rear brakes after the pedal is released. Apparently it's the reason why I have no complaints about pad knock back with my rear discs like everyone else not running a floater complains about.
It obviously has other drawbacks though...
I've been running it like that since I put the 9" in 5 years ago, I've just never had my post run data collection this refined to nail it down like I did last couple of events.
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Lance
1985 Monte Carlo SS Street Car
I spent the day yesterday autocrossing with the Gateway Autox group...and by the day...I mean the whole damn day!! It was sort of the tale of two tracks, the first 8 runs in the morning session were on a rain soaked, standing water everywhere, type of surface and the second set of 8 runs (yes, 16 runs total in one day!!) were on a somewhat dry surface.
Even with the weather, the event was fantastic, well worth the 4 hour drive to attend. Huge thanks to the Luebcke family for hosting me the night before and keeping me nourished and refreshed throughout the day. Really enjoyed racing and just hanging out with you all, have to do it again soon. It was also good to see the rest of the KC group that came over to race, Frank, Georgia and Keith and to meet up with some STL friends like Dan and Eric. You all know it's your turn to come to KC for an event now right?
Here's the tale of two runs, first is my second run in the rain where I was still trying to figure out where the grip was...and where it wasn't and the second run was my fastest of the day in the dry. What a fun course...really enjoyed running on it.
It is now time for some new tires...for sure...they should be here on Wednesday.
I also need to do something to back off on the rear brakes. The Ron Sutton Race Technology Stage 4 setup is working great in the slaloms and twisties letting the car carry way more speed there, but too much rear brake is making the car loose on corner entry which is holding the car back in the sharper turns. I've got a couple of quick fixes I may try, while planning a more important permanent fix for the future. It's true what they say, the more you fix, the better you make the car (and the driver), the more the little things that are still wrong show up...
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Lance
1985 Monte Carlo SS Street Car
So, this picture was taken during entry into the fastest 90 degree turn on the course last Sunday.
To me, it looks like the Ridetech MonsterBar is holding the front pretty dang flat.
This picture is taken entering the next fastest 90 degree turn. I believe my rear braking issue is showing up here as at this point in the run my pads were fully heated up and the rear brakes were making the rear axle wheel hop under braking and turn in. That might just be the driver rear tire up in the air...
Front is still pretty flat though considering how far the pass front suspension is compressed.
This picture was taken during a high speed, off camber slalom turn.
I can't get over how well this car slaloms now with Stage 4 installed, I'm still trying to find the limits there. It's like a completely different car now...
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Lance
1985 Monte Carlo SS Street Car
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
finally welcome to the dark side....we have cookies
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