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-   -   How much converter slip?? (https://classracer.com/classforum/showthread.php?t=26322)

ron mattson 06-15-2010 07:15 PM
Re: How much converter slip??
 
The formula above is for radial tires, bias ply tires will grow, each manufacturer can
tell you approx how much at a given speed for any size tire. Like Alan stated each
car can vary in how much flash it will take to get it moving and how it will lock up on
the big end will depend on how much power and powerband width are available.
Most of the converter companies can get you really close if you give them accurate
info for hp, tq, weight,gearing and rpm potential. one other variable is where you race
sea level will differ greatly from altitude and so on. trial and error!!!! just my .02$

demps45 07-18-2010 05:59 PM
Re: How much converter slip??
 
I could be wrong, but if you record the engine RPM, and record the driveshaft RPM, assuming your in high gear and it's a 1:1 ratio, then the difference would be the converter slippage.

Dyno 07-18-2010 06:34 PM
Re: How much converter slip??
 
In my SS car, according to the Racepak, 5% on a good run, 6% in poor air. Dyno

Don Turk 07-19-2010 04:52 PM
Re: How much converter slip??
 
Dyno

My race Pak is showing similar like 1 or 2% Just curious how you calculate the percentage of slip.

Just curious for comparision sake

Thanks
Don

Jeff Stout 07-19-2010 06:27 PM
Re: How much converter slip??
 
Using my ultimate 2 tach I came in at 3.5%.454 390 HP SS car

Robert Simpson 07-20-2010 12:55 PM
Re: How much converter slip??
 
Quote:
Originally Posted by Glenn Briglio (Post 192608)
Most flogged out combos will have less than 5% slippage. Works on our car!
Glenn, who makes these converters that you mentioned? You can pm me if you want to. Thanks

Robert

Robert Simpson 07-20-2010 12:59 PM
Re: How much converter slip??
 
Quote:
Originally Posted by ron mattson (Post 192556)
Robert, to figure slip multiply your mph say 114 x gear ratio 5.13 x 336= 196499 then
divide by tire height 29.5 = gives you a rpm of 6661 then multiply by 1.08 for 8 % =7193.
just enter your correct values. mph x gear ratio x 336=@ then divide @ by tire height =true rpm with no slip and multiply by 1.08 for 8% 1.09 for 9% and so on to get your final rpm .
Ron thanks for the info. At times it is hard to see 7000 or 7050, but I have gotten close. Ron, who do you recomend?

Robert

Dyno 07-20-2010 06:47 PM
Re: How much converter slip??
 
Don, it will show in the Engine/DS ratio on your Racepak data. Check it at the end of the run.

Glenn Briglio 07-20-2010 09:07 PM
Re: How much converter slip??
 
No secret Mike Munsinger is the man for torque convertors.

Don Turk 07-21-2010 05:42 AM
Re: How much converter slip??
 
Thanks Dyno

When I was looking at the Engine/DS ratio it is 1.073 I had assumed that was 7.3% slippage. However when I did the math Engine RPM 6134 D/S RPM 5715 I came up with 6.9%. Not trying to split hairs here just trying to understand the math.

Thanks Again
Don Turk


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