I was driving the car around yesterday and thought i'd do a little testing to see where the converter was flashing to. Well the streets were too cold so I couldn't get an accurate reading with the tires spinning out of control. I then let the car go into 2nd and kept it around 20 mph and put the pedal down about half way so it wouldn't downshift. According to the tach my converter was flashing to about 3400. <img src="images/icons/confused.gif" border="0"> I tested it several times and the results were the same. My question is whether this method is accurate or if I need to be in 1st. TIA.

Dan

 

Not accurate.

Stall speed is measured when the converter output shaft is at zero rpm at the instant that it will start to rotate. If you are doing 20 mph, the output shaft is rotating. Also it sounds like you were using part throttle and not WOT in order to prevent it from downshifting.

If you have second gear start, you could use it to get a better estimate of stall speed (compared to measuring it in first gear) when flashing it from a dead stop.

 

Yeh I had to go only part throttle to prevent the downshift. I can't get the car going from a stop without major spinnage due to the cold road and RSAs on the car. Would it matter if the tires spun to get an accurate reading?

 

You could try putting the tranny in 3rd gear 1:1 ratio....and then sit at a light....hold on the brakes hard and floor it and watch where it stalls to. that should be near your true stall just dont leave it floored for long <img src="gr_stretch.gif" border="0">


L8r
Will

 

[quote]Originally posted by 99BlueZ28:
<strong>Would it matter if the tires spun to get an accurate reading?
</strong><hr></blockquote>

Yes, because you can't fully load the converter.