grogan545

Since I can,t figure out how to get an attachment on my post I will post the data for the drag strip & the GT2
...................................run#1.......... ......................................run#2
.................drag strip.....................GT2..............drag strip.......................GT2
60'................2.049.......................1.9 7..................2.026.........................1 .97
330'..............5.827.......................5.75 ..................5.794.........................5. 70
1/8 time........8.906.......................8.83...... ............8.861.........................8.78
1/8 speed......80.75.......................80.70...... ..........81.04.........................81.20
1000'............11.508......................11.43 ................11.455.......................11.37
1/4 time........13.704......................13.63..... ...........13.644.......................13.55
1/4 speed......102.88......................102.60..... .........103.22.......................103.00
0-60..............................................5. 18................................................ ..5.07
As you can see the GT2 is consistantly between .07 & .09 seconds faster than the strip timer.I believe this can be explained by the staging process at the strip.The GT2 is set for a 12" rollout.This doesn't change.When staging at the drag strip it is very difficult to stop exactly when the second light comes on.You tend to be several inches into the second light.A 12" rollout adds about .3 seconds to your elapsed time.So if you are staging at 9" rollout,your time will be affected by about .075 seconds.
I first made 2 runs with the DTC/DTS on.The track was slippery which caused wheelspin which caused the controls to reduce hp & torque.The times were 13.899 & 13.809.Each run I made was progressivly better.I think If I made several more runs I could have got the starts down better and maybe turned a 13.50.I never was able to make a "zero wheelspin"run.On my test road zero wheelspin always gives me the best times.My 0-60 times are under 5 seconds when I have zero wheelspin.
I don't know why the poster who said that the timers he tested were inaccurate.I believe he said by about .3 seconds & 4 to 5 mph.I found that statement to be incorrect for my GT2.As you can see the et's are less than .1 sec and the speeds are very close with the GT2 showing less mph most of the time.
Zman the times I posted are uncorrected.I don't think the weather will help them but here are the conditions
Temp 43F,dew point 33F,barometer,30.17,humidity 68%,altitude 522'.
Oh by the way I killed a Chrysler 300 hemi(not srt)on 1 run 13.809 to 14.0456.

grogan545

See post #11.I posted all data from the strip and the GT2

znod

The 300 is a good kill. Way to go.

grogan545

Having had a day to reflect on my trip to the strip and by reviewing my written records of my street tests I have concluded the following:
1-My 545 is capable of 1/4 et's between 13.33 & 13.644,depending on weather,road surface,and my ability to adapt to these conditions.My best street time is 13.25,but I added .008 to this time to make up for the error I found in the GT2.
2-The speed at the end of the 1/4 is a bit more puzzeling.My best at the strip is 103.22.On the street I have a best of 106.8.This is a big difference,but my GT2 is consistantly about .2 mph slower than the strip.The only thing I can point to is better weather conditions on the street(26F,dew point 7F on the 106 run).
3-I believe in competition between a 545,550,335,and a IS350 it is a drivers race.All of these cars are capable of producing the times I mentioned above.If all cars had exactly the same start,the 550 & the 335 would begin to edge ahead at the 1/2 way point.At the 1/4 I would bet there is less than a car length separating them.
4-After reviewing my records for street tests I found 6 runs under 5.00 seconds.The best being 4.78 and the worst is 4.99.I have had more runs under 5.00,but don't have written data.I believe these numbers because on my 13.644 run at the strip,my 0-60 was 5.07.So it is reasonable to expect my 0-60 time to be under 5.00 on a 13.33 run.
All data above is not corrected for weather.Znod does weather corrections based on NHRA proven formula's,but I am not convinced the are accurate.My best corrected time of 13.28 was on a warm humid day.It doesn't make sense.It looks as if these factors overcorrect.However it makes sense that some correction is necessary to account for different weather conditions.It just seems that the further you get from standard conditions the more skewed the numbers look.
I believe I have extracted all I can from my 545 in its present form(completly stock,I even leave the spare in for testing).For now I am done with testing.It's time to give ol Black Bart(saphire black)a rest.If or when I get my ps2's I may try a few more tests to see what he will do with good tires.

znod

Hi g-man:

I am sorry to see you hang up your glove until you get new tires, but, yes, I agree that you have gotten what you can out of your car. I also agree with all you say above--except possibly one thing. The possible over correction that you mention seems to occur much more frequently when weather is much worse than standard as opposed to to much better than standard, yet there is no numerical bias in the corrections factors (i.e., they are symmetrical about standard conditions). So, assuming the symmetry I mention is appropriate, the possibility remains that our cars perform disproportionately better when the weather is sufficiently worse than standard--i.e., they lose less "noticeable" HP when when conditions are "a sufficient number of measurement units" to the bad side than they gain when weather conditions are "a sufficient number of measurement units" to the good side. In our scheme "a sufficient number of measurement units" is interpreted as a sufficient number of feet of density altitude.

Don't quit posting. We'd miss you.

EBMCS03

Very good analysis grogan545, to my what you said sounds right too.

Looks like you have a pretty quick 545.

grogan545

Thanks Zman.I don't intend to quit posting.I am waiting for more 550's and some 335's to join in the fun.

grogan545

Thanks EBMCS03.I wonder if you could somehow run your IS350 against your 545.It would be a neat trick if you could.

swajames

excellent thread - key point for me from Grogan's post is the corroboration of the GT2's accuracy and thus confirmation that the sub 5 second 0-60 times Grogan, Znod and others have reported are accurate. I've never thought otherwise, but there have been posts here casting doubt on the quick times recorded with G-Meters - and here we have validation of their accuracy. In fact, it's tempted me to go out and get one, so assuming I do there may be some 550 times here soon!!!

grogan545

I have sent my info to dragtimes.com.It should be posted in the next 24 hours.I will have the fastest time for a 545 for now.I am sure someone will beat it in the next few months.