Racers, help me digest these time slips

[63 Nitrous Ratt Vette]

I put a new converter in the car and tried a new way on launching it. I swapped my BTE for an Edge converter. I normally engage the nitrous on the brake and let it push against the converter as hard as it can. With the new converter Edge asked me to launch on the motor and let the nitrous come in at the release of the transbrake to flash the converter.

The track tonight was very cold (DA was 200) but the temp was 54* so none of the fast cars (6.0 and quicker) were getting down the track, me included. I made three runs and the first two I launched the way Edge asked me to and the car felt like it moved a little soft just for a sec. and then carried the front tires a much further distance than normal. It also had its best 60' with the new gears 1.174, but the track was slippery and I had to lift at about 200 feet. I came back the next run and left like I normally do(nitrous on brake), the car left pretty straight, got loose so I lifted, and got back into it (I thought I was off the throttle for at least a couple of 1/10 maybe more) the car ran 1/10 from its best time ever! I could not believe it.......I thought best case it went a 5.5xx or a 5.6xxx maybe worse Here is the question, how good of a run was this on until I had to lift? Did I learn anything about the new converter? It appears the car likes to launch the way Edge wants me to, but I got to have a track that will hold the converter flash.

Here is a side by side with the best run the car has ever made vs. the 5.35 run tonight.

Best
1.177
3.393
5.254
133.96

Tonight's 5.35
1.203
3.471
5.350
130.81

The car run the 1st half of the track .645 quicker on the 5.25 run, but them only .018 quicker on the 2nd half....I would think with all the momemtum I lost when I lifted, there is no way it would make up the 2nd half of the (track vs. the best run the car has ever made) like it did. ???? Unless something really good is happening somewhere.

Any input from you more experienced racers?

Thanks,
John

[MileHighMan]

John, look again. Your half track time slowed on the 5.35 run to the tune of .078sec. The 60' was off by .026sec, and you slowed a total of.096, and a few mph. I think, still pretty good for having to lift off the gas. Keep us informed, and Good Luck. Dan.

[63 Nitrous Ratt Vette]

How did I mess the math up on that??

[Cobra]

Full runs will be needed for a thorough evaluation. Use a laptop or notebook to record all pertinent information from every run. A good baseline will give you something to start with. From information you posted, the new converter appears to be a good investment! Your car may be aiming for 5.0's!

[maxracesoftware]

Here is a side by side with the best run the car has ever made vs. the 5.35 run tonight.

Best
1.177
3.393
5.254
133.96

Tonight's 5.35
1.203
3.471
5.350
130.81

i ran a Simulation on both your progressive incrementals
here's more Info to look at=>

• 60= 1.1770 56.2388
  330= 3.3930 105.8722
  660= 5.2540 133.9551
  1000= 6.8044 152.3642
  1320= 8.2350 152.0668
  Tire Friction Coeff= 2.2314
  
  ------ Front Tire ------
  RollOut Distance Data
  Ft ET MPH GForce
  -1 -0.1669 0.0000 0.0000
  0 0.0000 8.1701 2.2314
  ********************************
  
  
  
  60= 1.2030 54.7805
  330= 3.4710 104.0519
  660= 5.3500 130.8073
  1000= 6.9770 146.4267
  1320= 8.4530 148.4022
  Tire Friction Coeff= 2.1360
  
  ------ Front Tire ------
  RollOut Distance Data
  Ft ET MPH GForce
  -1 -0.1706 0.0000 0.0000
  0 0.0000 7.9935 2.1360

[ou812]

Where were you racing?? Would like to go but got a new dyno coming in a couple weeks so all my time is spent building a dyno cell right now.
Looking sooooo forward to racing again!! I want to join psca and run there cicuit maybe...
Ever race Barona??
Brian

[63 Nitrous Ratt Vette]

I run at Irwindale, never been to Barona.....do they prep it well?

[63 Nitrous Ratt Vette]

Here is a side by side with the best run the car has ever made vs. the 5.35 run tonight.

Best
1.177
3.393
5.254
133.96

Tonight's 5.35
1.203
3.471
5.350
130.81

i ran a Simulation on both your progressive incrementals
here's more Info to look at=>

• 60= 1.1770 56.2388
  330= 3.3930 105.8722
  660= 5.2540 133.9551
  1000= 6.8044 152.3642
  1320= 8.2350 152.0668
  Tire Friction Coeff= 2.2314
  
  ------ Front Tire ------
  RollOut Distance Data
  Ft ET MPH GForce
  -1 -0.1669 0.0000 0.0000
  0 0.0000 8.1701 2.2314
  ********************************
  
  
  
  60= 1.2030 54.7805
  330= 3.4710 104.0519
  660= 5.3500 130.8073
  1000= 6.9770 146.4267
  1320= 8.4530 148.4022
  Tire Friction Coeff= 2.1360
  
  ------ Front Tire ------
  RollOut Distance Data
  Ft ET MPH GForce
  -1 -0.1706 0.0000 0.0000
  0 0.0000 7.9935 2.1360

152 mph in the 1/4 at 8.23?? Are you sure about that mph?

[ou812]

Prepped well...what's that
Yeah, they do an OK job, but Irwindale is better prepped probably. When they have good paying brackets they spray and heat the starting line.

[63 Nitrous Ratt Vette]

An update, I went back to the track and with all other things being equal I went my two fastest et's ever....by .006 and .011 respectively. Most of the et was gained in the first 60 so I think they way I am launching is accounting for the new bests. I tied my best ever 60 (1.150) and backed it up with a 1.156.

Mph was 133+, best being 133.96 with the old converter.