Re: Torque slippage question

Mark Miller July 30th 2010, 1:27 am

bbf-falcon wrote:What did you type in for trans. ratio? I put 1 to 1 and it just said nan What is a realistic % slippage number for my combo

Rick,

For trans ratio put in 1.0 and it should come out for you,Later Mark

bbf-falcon July 30th 2010, 5:12 am

Wheelie58 wrote:Hey Rick,
What does your converter flash stall to?
Just curious.
To get a respectable stall and (maybe) a decent efficiency I had to go to a 10" converter.
After I re-jazzed my 514 a few years ago, I was on a mission to get a converter that would stall at about 5200. My engine was at peak torque at about 5000, so I thought that it would be good. A tight 8" was 5700+. I ordered a new 9" and it came out 5600.
I sent it back...for tightening, and ended up with 5500. I ended up trading it back to BTE for a 10" Top Sportsman converter. It was precisely 5200.
The 605 has between 9% and 11% of actual slippage (RacePak) right at the 1/4 mile mark with the same converter. That can vary with tune, wind and other unknown factors.
I plugged my numbers in to the TCI calculator and it says 10.37%, so it must be pretty accurate.
Mine is 4.30 gear - 33" tire - 7200 RPM @ 149MPH.
Just for reference. Maybe this information will help.
Thanks,
Keith

What is your MPH? Thx 4 info

bruno July 30th 2010, 7:09 am

feetfirst wrote:You guys are forgetting an important factor.........tire growth.

1-1.5"+ on a 28 or 29.5 tire at 150+ mph......not sure on a W tire

so i added the tire growth factor into the formula and it comes up with 2.143%

Wheelie58 July 30th 2010, 8:08 am

bbf-falcon wrote:
Wheelie58 wrote:Hey Rick,
What does your converter flash stall to?
Just curious.
To get a respectable stall and (maybe) a decent efficiency I had to go to a 10" converter.
After I re-jazzed my 514 a few years ago, I was on a mission to get a converter that would stall at about 5200. My engine was at peak torque at about 5000, so I thought that it would be good. A tight 8" was 5700+. I ordered a new 9" and it came out 5600.
I sent it back...for tightening, and ended up with 5500. I ended up trading it back to BTE for a 10" Top Sportsman converter. It was precisely 5200.
The 605 has between 9% and 11% of actual slippage (RacePak) right at the 1/4 mile mark with the same converter. That can vary with tune, wind and other unknown factors.
I plugged my numbers in to the TCI calculator and it says 10.37%, so it must be pretty accurate.
Mine is 4.30 gear - 33" tire - 7200 RPM @ 149MPH.
Just for reference. Maybe this information will help.
Thanks,
Keith

Depending on track..air..wind...me...but between 147.5 and 150

What is your MPH? Thx 4 info

maverick July 31st 2010, 8:18 pm

Hey, Rick.....I just took my first peek at this thread. Are you sure of 4.30 ratio you're putting into the calculator? Just wondering, as I recall that chunk you got at the Bash was a 4.33. Dunno how much difference it makes, but did you ever do an actual tooth count? FWIW

richter69 July 31st 2010, 9:44 pm

maverick wrote:Hey, Rick.....I just took my first peek at this thread. Are you sure of 4.30 ratio you're putting into the calculator? Just wondering, as I recall that chunk you got at the Bash was a 4.33. Dunno how much difference it makes, but did you ever do an actual tooth count? FWIW

this is true, my "4.33" is actually a 4.28............not sure how much that matters. Either way at that mph with the given gear and tire size the trap rpm should be a lot lower than 7400

bbf-falcon August 7th 2010, 11:25 am

When I bought it from Rich Talley at the Bash I counted it,I'm pretty sure it was a 4.33. Like Jon said,4.29 thru 4.30 it should'nt change that much.

Larry Williams August 7th 2010, 12:11 pm

mine calculates to - 3.808 am I doing something wrong or is the converter too tight. it flashes to 4500

rpm 7200 tire 28 rear gears 4.57 mph 135.54

richter69 August 7th 2010, 12:42 pm

You can get away with the converter slip being lower and using a steeper gear.......if the car will 60' good with this combo it will move the car down the track better.

Larry Williams August 7th 2010, 1:34 pm

it was a 1.40 60 foot it wasn't a good launch the tires lift and settle right back down. Haven't done any shock of strut adjustments yet. will be renting the track one day this week if there is time before the big race this weekend just to play with settings.
I just changed from 4:10 to 4.57 its only a scat nodular crank so I didn't want to turn it too high. which gear do you recommend?

I do have a fresh 'glide with a 1:84 low gear sitting in my computer room waiting on the big bullet. should it help a bit?

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