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 Post subject: Converter slippage ?
 Post Posted: Fri Aug 24, 2007 6:04 pm 
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How do you figure out converter slippage ?


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 Post subject: Re: Converter slippage ?
 Post Posted: Fri Aug 24, 2007 7:00 pm 
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RT wrote:
How do you figure out converter slippage ?





Right here but don't know how accurate it is


www.wallaceracing.com/Calculators.htm

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 Post Posted: Fri Aug 24, 2007 8:49 pm 
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I never much cared for any type of calculator to come up with converter slippage as your guessing at tire growth which will skew the final results.

I run a simple $550 basic RPM Performance data logger which records engine & driveshaft rpm. With this tool I can accurately come up with converter slippage by comparing engine & driveshaft rpm at the finish line.

You can also use an Autometer dual channel tach which records the same thing, but it's more money and is not expandable. The RPM Perf data logger is fully expandable to 12 channels.


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 Post Posted: Fri Aug 24, 2007 8:56 pm 
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If you don't have a data logger then your saying that your guessing right??
So the calucator is your best bet for now..


I have a computech data logger in my Beretta...It logs egt,fuel pressure,driveshaft rpm,engine rpm,acc meter and times the release of the trans brake till the car moves =;  =; ......Converter slip is easy to figure when you have the toys to do it ;-)

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 Post Posted: Fri Aug 24, 2007 10:53 pm 
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I just used the calculator on my car and it says 11%?  Sounds kinda high, huh!

That's 7000rpm, 126mph, 4.86 gear and 104" roll out.

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 Post subject:
 Post Posted: Sun Aug 26, 2007 8:29 am 
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No data logger
Thanks everyone for your help..
The calculator said I have 10.5 % is this good or bad ?


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 Post Posted: Sun Aug 26, 2007 10:04 am 
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RT wrote:
No data logger
Thanks everyone for your help..
The calculator said I have 10.5 % is this good or bad ?


Hummm, dunno!  But you and I aren't far apart.

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 Post subject:
 Post Posted: Sun Aug 26, 2007 12:03 pm 
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Am I off base but 5% is  good for 1/4 mile???

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 Post Posted: Sun Aug 26, 2007 12:50 pm 
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the calculator is an estimate. To me there are too many variables for that to be considered accurate.  You can't measure tire growth at the top of your run and as far as estimating that goes, the tire pressure and wheel size and speed will affect what the manufacturers tell you it will grow.  How accurate the MPH clock is at any given track plays into it too and then how accurate is your tach?  I  think that's been discussed here in another thread.

Barry, the log file I got from you looks like your convertor is slipping 13% -14% 5.8 seconds into the run and 6%-7% 8.8 seconds into the run. I don't remember what you said your cars ET was in the 1/4 and 1/8 but I think it was somewhere around that. That being said It looks like the 1/8 mile stuff is within a couple of % for you Ken & RT. I would think less slippage at higher speeds would be normal.

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 Post subject:
 Post Posted: Wed Aug 29, 2007 8:37 pm 
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10secBu wrote:
I never much cared for any type of calculator to come up with converter slippage as your guessing at tire growth which will skew the final results.

I run a simple $550 basic RPM Performance data logger which records engine & driveshaft rpm. With this tool I can accurately come up with converter slippage by comparing engine & driveshaft rpm at the finish line.

You can also use an Autometer dual channel tach which records the same thing, but it's more money and is not expandable. The RPM Perf data logger is fully expandable to 12 channels.

check your PMs


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 Post subject:
 Post Posted: Fri Aug 31, 2007 2:24 pm 
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http://www.tciauto.com/Products/TechInf ... lators.asp

This is the one I use, and trust more, and aslo has a lot of other useful easy to use programs


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 Post Posted: Fri Aug 31, 2007 4:44 pm 
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JeffMcKC wrote:
http://www.tciauto.com/Products/TechInfo/Calculators.asp

This is the one I use, and trust more, and aslo has a lot of other useful easy to use programs





I like this one better to =;  =;

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