torque convertor slippage

Kev · Post by **Kev** » Sun Oct 21, 07 7:43 pm

Slippage is about 0.8% on a standard 'vertor, I assume you have a super slippery one...

Anonymous · Post by **Anonymous** » Sun Oct 21, 07 9:02 pm

Maybe the tach is out.

Dave-R · Post by **Dave-R** » Sun Oct 21, 07 9:40 pm

What rpm are you checking at?

Dave-R · Post by **Dave-R** » Mon Oct 22, 07 10:32 am

Well the converter is not slipping. If anything it would be the trans slipping.

However you dropped a little hint there when you said "beleive to be 4.10".

I suspect you have 4.56:1 gears. Because on my chart that gives you 120mph at 6000rpm and 130mph at 6500rpm. That would fit in nicely with what it says on your ticket.

Dave-R · Post by **Dave-R** » Tue Oct 23, 07 10:33 am

gasser wrote:what rule are you using dave as mine still seems off, think next step is to confirm axle ratio

I was using my own.
http://challenger.mpoli.fi/web/AUTOMATICchart.xls

If I am not right about the axle gears then I would suspect the trans not the converter.

Dave-R · Post by **Dave-R** » Tue Oct 23, 07 10:41 am

I just double checked to make sure I have this right.

With 4.56 gears and 33-inch tall tyres I have you down as doing 19.95mph per 1000rpm.

Which is 125.7mph at 6300rpm.

All this is assuming 8% converter slippage.

Now that does not include tyre growth so you can easily make up that extra 1.3mph on your timing ticket with that.

Cannonball · Post by **Cannonball** » Tue Oct 23, 07 3:46 pm

i reckon me old dart has got 450 somethins, its a ford 9"

Dave-R · Post by **Dave-R** » Tue Oct 23, 07 4:22 pm

You can get a 4.56 for a Ford 9-inch I think.

Cannonball · Post by **Cannonball** » Tue Oct 23, 07 6:15 pm

thats what it had then dave

Anonymous · Post by **Anonymous** » Wed Oct 24, 07 8:56 pm

you can definately get 4:56's for the 9inch we have a brand new set in the garage for the satellite