power loss from conveter
Thread Starter
Teching In
Joined: Sep 2006
Posts: 21
Likes: 0
power loss from conveter Hey guys I just have a few questions. Ok I have a 98 transam ws6 with a 3000stall converter. My question is how much power do you lose i know it does show loss on a dyno I think, but how much does it show on the topspeed on the 1/4? I just purchased the car and wont get it to the track until next year if i go at all so im just curious i need to buy tires for it since the converter is useless with the tires on the car now thats all i need to know just curious.
thanks guys for the help
quad
thanks guys for the help
quad
TECH Enthusiast
Joined: Mar 2004
Posts: 647
Likes: 0
From: Australia
Loss of around 20HP peak over a stock converter. How much off-the-line TQ do you gain? Around 40% more. You will also GAIN around 5% more average power from 4000-redline.
Peak means squat. Its only there for a second.
Peak means squat. Its only there for a second.
Thread Starter
Teching In
Joined: Sep 2006
Posts: 21
Likes: 0
Thanks for the replay I knew it was something small I just wasnt sure how much. I read on some post someone lost about 40rwhp on a heads and cam car witch seemed like a alot at the time. Well thanks for the reply
quad
quad
Your efficiency at the very top end, is all just slip losses
and is likely 3-10% off the top. You can do the arithmetic
based on your HP level. The converter has ceased to
multiply torque when you're that far past stall speed.
A lower-STR converter though the midband, maybe
well into the higher RPM, can be seeing some residual
torque multiplication which makes pure slip based
efficiency calculations somewhat bogus. You need to
have the shaft speeds and torques to know true
efficiency in that area. It's seldom you even see a
peak efficiency advertised, let alone guaranteed
and never ever is there an efficiency vs RPM curve
pair for you to compare between models & vendors.
Peak dyno numbers are not the story. Integral power
delivered down the track, is. Being up onto powerband
usually pays more than efficiency costs (better to be
getting 80% of 300HP than 95% of 200HP), pointwise
across the band.
and is likely 3-10% off the top. You can do the arithmetic
based on your HP level. The converter has ceased to
multiply torque when you're that far past stall speed.
A lower-STR converter though the midband, maybe
well into the higher RPM, can be seeing some residual
torque multiplication which makes pure slip based
efficiency calculations somewhat bogus. You need to
have the shaft speeds and torques to know true
efficiency in that area. It's seldom you even see a
peak efficiency advertised, let alone guaranteed
and never ever is there an efficiency vs RPM curve
pair for you to compare between models & vendors.
Peak dyno numbers are not the story. Integral power
delivered down the track, is. Being up onto powerband
usually pays more than efficiency costs (better to be
getting 80% of 300HP than 95% of 200HP), pointwise
across the band.
