Flashing the converter opposed to stalling it up??
10-22-2006, 02:26 PM
#1
Flashing the converter opposed to stalling it up?? I went to the track for the first time ever last night and ran a 12.17@111. I've never been so I wasn't really sure on the launching, I just burned out, then held the brake and stalled the car upto about 3200 then just let it rip on the last yellow. I still had some water on the tires so it spun some off the line but not too bad. Honestly I'm not too happy with the MPH and my power, but would flashing the converter and holding it at say 1500 then WOT at the last yellow help my MPH or is it just set?
10-23-2006, 07:00 AM
#6
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I have a data logger on my car. I've played with start line rpms from 1800-3200 rpm. It does not change the converter flash that I can tell, maybe 100 rpm at the most, but that could even be due to weather changes which alter power output.
The only difference I can see by varying start line rpm is it will change your reaction time.
The only difference I can see by varying start line rpm is it will change your reaction time.
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10-23-2006, 02:42 PM
#9
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There's a couple confusing terms here.
First there's your footbrake launch rpm. This is the rpm at which you keep the engine loaded with the brakes applied before leaving the line.
Then there's converter flash rpm. This is the rpm at which the converter will jump to as it's beginning to move the vehicles weight from a standing start. The only way to see this rpm is with some sort of data recording unit like a data logger or a playback tach.
Another converter rpm is the stall at which is will go to on a transbrake with no rev limiter chip. Obviously you cannot compare this rpm with a footbrake combination.
You can approximate converter flash rpm by driving the car in high gear at say 5 to 10 mph, then stomp the gas to the floor and watch the tach closely. The rpm's will rise quickly, then pause, then slowly continue to rise again. This pause in rpm is the converters flash rpm.
Also, another rpm converter manufacturers will ask a racer about is what rpm the engine falls back to after the shift.
Knowing as many of these details can help you help a converter manufacturer make sure your converter is truly performing as intended for your combination.
First there's your footbrake launch rpm. This is the rpm at which you keep the engine loaded with the brakes applied before leaving the line.
Then there's converter flash rpm. This is the rpm at which the converter will jump to as it's beginning to move the vehicles weight from a standing start. The only way to see this rpm is with some sort of data recording unit like a data logger or a playback tach.
Another converter rpm is the stall at which is will go to on a transbrake with no rev limiter chip. Obviously you cannot compare this rpm with a footbrake combination.
You can approximate converter flash rpm by driving the car in high gear at say 5 to 10 mph, then stomp the gas to the floor and watch the tach closely. The rpm's will rise quickly, then pause, then slowly continue to rise again. This pause in rpm is the converters flash rpm.
Also, another rpm converter manufacturers will ask a racer about is what rpm the engine falls back to after the shift.
Knowing as many of these details can help you help a converter manufacturer make sure your converter is truly performing as intended for your combination.
