Reasonable converter slip?
09-07-2017, 03:30 PM
#1
Reasonable converter slip?
Just looking at my dyno sheets and calculated converter slip of near 12% at 126 MPH and 6% at 150 MPH. This is assuming no growth of the 31.5" slicks. If there was 1" of growth, then the 126 MPH slippage was 14+%. 126 is my typical trap speed. What should I expect from a converter?
This is a PI vig multi disc, but I don't lock at WOT.
This is a PI vig multi disc, but I don't lock at WOT.
09-07-2017, 03:39 PM
#2
It is easier to do in terms of engine rpm.
At >6000rpm I want it to be <10% slip, with slip % being (trans input speed)/(engine rpm)
I had a converter that was roughly 15% and after I had it tightened it was around 8% and I gained 3-4mph in the 1/8th with no other changes, which at my weight was roughly 150hp.
At >6000rpm I want it to be <10% slip, with slip % being (trans input speed)/(engine rpm)
I had a converter that was roughly 15% and after I had it tightened it was around 8% and I gained 3-4mph in the 1/8th with no other changes, which at my weight was roughly 150hp.
09-08-2017, 02:02 AM
#6
Throw those numbers out the window. Not only are the numbers fudged a bit due to not having an actual driveshaft speed sensor, but trying to calculate based on engine rpm seen on the dyno is a waist. The motor will be loaded up a ton more when it is actually travelling 125 mph.
Once you can get some solid data, either by getting a driveshaft sensor or at the very least using data from an actual pass, you can make a better decision on what the truck will need.
A very good turbo converter will be on lock down through the traps, say 2-5 % unlocked. Where as procharged stuff likes it a little looser, say around 8-12%. Given that your blowers don't need engine rpm to build boost, I'd treat it like an N/A or turbo set up and guess that tighter is better for you.
Once you can get some solid data, either by getting a driveshaft sensor or at the very least using data from an actual pass, you can make a better decision on what the truck will need.
A very good turbo converter will be on lock down through the traps, say 2-5 % unlocked. Where as procharged stuff likes it a little looser, say around 8-12%. Given that your blowers don't need engine rpm to build boost, I'd treat it like an N/A or turbo set up and guess that tighter is better for you.