How much converter slip??
 

What %converter slip is normal for a STOCK Elm. car?

Re: How much converter slip??
 

It depends on the combination.

Re: How much converter slip??
 

396 325 hp 69 camaro

Re: How much converter slip??
 

An average car will see around 12-14%, maybe a little more. The problem is that they need stall to get off the line, but cannot pull enough gear on top and make enough RPM and HP to really lock up a converter and make it efficient.

Re: How much converter slip??
 

So I take it that if you have 8-10% you have a very efficient conv? I am speaking of a sb stocker. How do you determine the % correctly?

Robert

Re: How much converter slip??
 

Well, with a car that needs a ton of flash stall to get off the line good, but cannot turn a lot more RPM and make good power above that flash stall, yes, 8% is pretty good. That can be difficult with a lower HP stocker that doesn't turn a lot of RPM. If your finish line RPM is more than around 1500 RPM higher than your flash stall, and is also more than 800 RPM higher than your peak HP, it can be hard to get a converter to couple up really well.

Your finish line RPM and the MPH it should give, with your gear ratio and tire size, compared to your finish line MPH, will let you know about what your slippage is.

Of course, to do that, you are assuming the lights for the MPH clocks are set very accurately. That might be a big assumption, considering the variances you see in how well they are set of the starting line.

Re: How much converter slip??
 

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 .

Re: How much converter slip??
 

what if you only come up with one or two percent slip.

Re: How much converter slip??
 

It's pretty rare to get below 4% to 5%, in most cases anyway. Check your math, and check your actual tire size.

Re: How much converter slip??
 

Most flogged out combos will have less than 5% slippage. Works on our car!