converter slippage....

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converter slippage.... Empty converter slippage....

Post  wayney on September 27th 2016, 10:05 pm

hello, i am wondering what is considered acceptable converter slippage at the other end of the track. trans is a stock geared c-6. my current converter is showing almost 10% and this sounds high to me i would think 3-5%. also the rpms only drop around 1000 rpms on the gear changes?
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Post  whatbumper on September 27th 2016, 11:11 pm

Anywhere from 0 to 20%. I know that's not the answer you want to hear but that's the best most guys can give you. It really depends on what core your converter is to define an acceptable range.

Ex: I have a customer that runs 4.70's on 275's that slips 8%. He wanted a more efficient converter that flashed the same so we did it. Car slowed down. Same drop on shift and same flash point. Put the old converter back in that we also built and bam; back to 70's.

Have another car in the same class running basically the same times that slips in the 3% range. That combination hates slippage. Kills the mph.

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Post  cool40 on September 28th 2016, 9:56 pm

^^^exactly! Lots of variables to say but 10% can be the happy place for a combination. If it's a NA application I'd about bet it'll slow down with a tighter converter. It's been my experience that a converter on the loose side will front half better but mph less and the tighter one will not 60' as well but mph more,and ET the same with both. Suspect
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Post  richter69 on October 3rd 2016, 10:47 am

I had my converter out 3 times in the last month, swapped stators.... Finally went to a 10"..... Im in the 12% range now and everything seems pretty happy.

Honestly if your not ready to wear the bolts out on it id say your prob beat to leave it be, converter charge press is a whole diff subject.
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Post  wayney on October 4th 2016, 9:19 pm

richter69 wrote:I had my converter out 3 times in the last month, swapped stators.... Finally went to a 10"..... Im in the  12% range now and everything seems pretty happy.

Honestly if your not ready to wear the bolts out on it id say your prob beat to leave it be, converter charge press is a whole diff subject.

thanks for the input. i would expect a 2 speed racing trans to have a little more slippage. i have a continental that is probably going to be on the tight side. I am going to put it in and see where it is and try to get out before the tracks close. I am planning a power adder over the winter so this tighter converter might work well with a couple hundred of frosty.

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