I went to Opening day at RMR today. The track opened at 10:00 AM, though no one was allowed to actually RUN until about 11:30, and they shut down at 5:00. I managed to get in a whopping 3 runs! In addition to a poorly managed day, by the track, they only let people run the first 1/8 mile, due to the wind...you know: because it might blow the car off the track! Now I want my Saturday back. (and my $25). Someone....PLEASE open a new track in Utah...PLEASE!

Anyway, I only got data to the 1/8 mile but wanted to compare this data w/similar data from my best pass yet.

So to start with, my best 1/4 mile pass to date (that I've recorded)
60'.........2.221
330'.......5.769
1/8........8.611
MPH.......87.36
1000'.....11.023
1/4........13.059
MPH.......110.29

Now here is todays:
60'.........2.100
330'.......5.511
1/8........8.529
MPH.......85.81

Today's abbreviated run got me the best 60' time ever for me in this car on the junk stock tires. What bothers my is why I MPH'ed slower today, even though I ET'ed faster? My 330 to 660 was .2 slower today, which is a LOT. My goal is 12.xx w/a bone stock car...at this elevation. I thought that a 2.1 60' would get me there. But looking at the data from today's run, says to me that had I been able to run this run out to the 1/4, I still wouldn't have hit 12's. In fact, it looks like I would have been even slower than the 13.05 from last summer.

The only thing I've changed in my driving is the moving of my shift point from 5900-6000 to 6400-6500 RPM according to the math I did in this thread.
http://forums.corvetteforum.com/show...1830510&page=2
-I "come around" in post #40.

Now I wonder if the math is correct....

Comments?

 

I'm not the expert in any way, shape or form but maybe because you hooked better, spun less and thus your mph was slower. Or it was warmer, higher DA, you could still hook but mph was down a little bit.

 

I usually avg a factor of close to 1.55 x 1/8 mile for my runs. Your pass was probably around a 12.93. The 0.08 drop in 1/8 would have done it alone, but you gained a little down the 1/4 too.

I would hate to race at high elev.

 

Yeah, I in both runs shown, I did big burn outs and got some of the best "hook" that I've ever gotten w/the car. Neither time was there much spinning, if any.

The DA on the first run (last summer) was 7600'. Today it was 7100' to 7600' through the day.

-Tom

 

Thanks for this post.

Yes, racing at elevation is very frustrating. It's nice to compare your results w/others' but that is hard to do from here. All I can compare with is other locals, from this track, which is a limited selection. The frustration is exacerbated by the track we have to contend with here and the extremely limited services they offer. And, unfortunately, it's the only game in town.

 

Better ET = slower MPH most of the time the way i think of it in simple terms you did not have as much time to get to a higher mph.

My best MPH is 11.3 at 125.x but my best ET is 11.1 at 123.6

 

Yeah, i know all about that general "rule" too. I guess I shouldn't worry about this too much because it's only 1/8 mile data, and fairly useless. It just concerns me that the only significant change was raising shift points and now I go slower from the 330 to the 660. By 2/10ths.

I don't see how a better "hook" (although 2.1 60' is still not a "good" launch, IMO) would hurt my 300 to 660 to the tune of .2. I can see a better hook hurting the 60 to 330, and MPH...

Basically the data from yesterday implies that shifting closer to 6500 rather the 6000 is going to slow me down. But since I was only able to run to the 1/8th, I guess it's kind of pointless to scrutinize, since it's pretty limited data.

 

That is possible you would need to know your exact Avg HP and TQ from your low rpm to the shift point lets say 4500-6500 and 4000-6000.

The one that has more TQ should be faster in your case.

I have run the standing mile many times for fun no clocks but it feels faster shifting lower on my A6 and I see a higher top speed.

 

Interesting about the 1 mile runs. Since I bought my 'Vette, I've shifted it at the track at 6000 RPM on the button. I've also consistently beaten all other C6's in my region, by at least 1/2 second! Furthermore, I've beaten nearly all C5's including TT, and 'Charges ones, C6 Z06's and ZR1's. This was evidence that "proved" to me that shifting at 6 was the right thing to do. Thsi thread, however, convinced me that I was wrong:
http://forums.corvetteforum.com/show...1830510&page=2

More experimentation is in order. I need REAL track to work at.