I have a couple of logs from the track and as I was looking them over noticed after I brake stall the converter it flashes way to high from the looks of it. I'm not sure if I am looking at them correctly because to me it look like after the initial brake stall of 3100-3400 it flashes close to 5900 or more on a 4800 converter.
Could some of you look at the logs attached and see if you can tell where the converter is flashing to?
Run1 it footbraked to 3100+ and Run2 is footbraked to around 3400+.
Pewter 2000 SS A4
T-Rex Cam (242/248), Hooker LT's, 3" X-pipe Duals, Fast 90, NW 90mm TB, Yank PT4800, 4.30 gear, etc....
Black 08 C6 A6 Z51
Mostly stock
First, let me make clear the respective stalls speeds of a converter (from lowest rpm to highest rpm):
Brake Stall = Highest stall speed reached by applying brakes while stopped. This is dependent on brake system quality, condition of the tires, condition of the road/track surface. This is the lowest and least accurate method of measuring converter stall speed.
Flash Stall = Highest stall speed reached when the accelerator is 100% depressed, prior to actually moving. No other variables affect this stall speed, although this is also not the most accurate method of determining converter stall speed. It is much better then brake stall. Many consumers use this method to compare different converter brands. This is stall speed is always in between the brake stall and the true stall speed of a converter.
True Stall = Highest stall speed reached while transmission output shaft speed remains at zero, and engine is at WOT. This is the true method of determining a converters' stall speed. The only way to measure this is by use of a converter dynamometer or a transbrake. Not many companies possess this ability to measure different converter stall speed. This will be the highest stall speed a converter can reach.
Having said that, and looking at your logs ... your flash speed is about 4000 rpms. To find out this value, look at the TPS% where it is at 100%, then look for MPH to be zero (or very near). At this point is the flash stall rpm. Hope this helps.
Logs look about right for a 4800 converter to me... Without a trans brake you won't see true 4800 stall... Shift extension is on par with where it should be.
That's one hell of a loose converter there!
According to the flash stall method you posted it looks like to me it flashes around 1924 rpm.
Could ya'll check this log out and see what you think?
Pewter 2000 SS A4
T-Rex Cam (242/248), Hooker LT's, 3" X-pipe Duals, Fast 90, NW 90mm TB, Yank PT4800, 4.30 gear, etc....
Black 08 C6 A6 Z51
Mostly stock
On that last one, your flash stall is just over 3800 rpms. I usually try and log the least amount of PIDs to help determine things like this. The more PIDs you log, the less resolution you will have in your logs.
Is car spinning tires alot when u leave??
How did you see 3800 at 100% TPS and 0 mph? When I look at it 1924 rpm is 100% TPS and 0 mph. Then it goes to 3844 rpm at 100 % TPS and 2mph.Originally Posted by 12secSS
Pewter 2000 SS A4
T-Rex Cam (242/248), Hooker LT's, 3" X-pipe Duals, Fast 90, NW 90mm TB, Yank PT4800, 4.30 gear, etc....
Black 08 C6 A6 Z51
Mostly stock
Not that I can feel. Why would you say that?
Last edited by BAIN; 11-02-2006 at 07:45 AM.
Pewter 2000 SS A4
T-Rex Cam (242/248), Hooker LT's, 3" X-pipe Duals, Fast 90, NW 90mm TB, Yank PT4800, 4.30 gear, etc....
Black 08 C6 A6 Z51
Mostly stock
Because ...
... since it was at 2 MPH.It is kind of hard to pin point the flash stall, as it can happen very quickly. Also as I mentioned, if you log less parameters you should be able to more clearly see the flash point of the converter.
Ahhh ok thanks. Looks a little low for a 4800 converter to me. This was a 4400 that I had them loosen up to a 4800 and it really doesn't look like they did. It looks to me about where a 4000 stall should be.
Pewter 2000 SS A4
T-Rex Cam (242/248), Hooker LT's, 3" X-pipe Duals, Fast 90, NW 90mm TB, Yank PT4800, 4.30 gear, etc....
Black 08 C6 A6 Z51
Mostly stock
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