Technical > Dan Dishon's Transmission Den
converter fallback
wideopen231:
I would not think fall back had anything to do with stall as long as rpm after shift was above stall number. If I shift at 7500 and then at 8500 I would expect it to fall back to same number,say 1000 off each. If it fell back same amount on both shifts I would say thats the number. Thats provide both times the number it fell back to was above stall. Maybe clarify .Shift 7500 hit 6700.then 8500 hit 7700 and both on 6600 stall converter. These are approximate numbers my old nova did I think it was 2400 lbs,xxxx was while back. My thinking was hp and weight effected it more than stall.Maybe in left field or xxxx might be different ball park.
I have always heard stall is as bikerguy stated in checking stall comments.
retroboy:
Wouldn't the gear ratios in the transmission effect this?
Roger:
Think of it like this. If you had a clutch car with a 2 speed transmission with a 1.76 first gear ratio and shifted at 7500rpm, then the engine would drop to 4260rpm after the shift (7500 /1.76 = 4261). Now if you take the clutch out and replace it with a 1.76 first gear Powerglide and a 6600rpm stall convertor and then shift it at 7500, you would not fall back to 4260 but rather drop back to the 6600rpm convertor stall speed. Raise the shift point to 8500 and it wouldn’t fall back to 4830 (8500/1.76 = 4830) as with a clutch but to the 6600 stall speed. The only way you can get the Powerglide car to fall back to an rpm over the 6600 of the convertor stall speed would be to shift the car at 11,700rpm and watch the engine fall back to 6650rpm. And that’s only IF you can get the engine to reach well over 11,000rpm to begin with.
wideopen231:
what abot converter slippage? I know quite a few guys have talked about 10% or more,using daat logger info.
gregm784:
My converter guys say i should see 4.5-5%. i'd love to know for sure, and that is a main reason i want a data recorder.
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