Torque slippage question

Hey guy's, I need someone to figure my converter slippage. PG,8" conv,4.30 gears,31.5 tires,7400rpm at the line at 140 mph

http://www.tciauto.com/Pages/418/calculators.aspx

Rick,

I put in your numbers at the TCI site and it looks like 15.241% slippage if i put everything in right.Try it also and see if you come up with the same thing.

Later Mark.

That's way too much IMO, 8" has no place in there.

richter69 wrote:That's way too much IMO, 8" has no place in there.

I agree Jon,I finally listened to the video last nite that Sooz took from the stands at half track and it slipped all the way through. I will order a new 9.5 as soon as my RC budget builds up

Same Problem here, My 8" is at 28%..... . RC budget is low here this year too, No O freakin' T at work.

also what kind of rpm drop on the shift?

MINE COMES OUT TO -45% what im i doing wrong

bruno wrote:MINE COMES OUT TO -45% what im i doing wrong

not enough Coffee yet?

what input do i need on my tranny gear ?

high gear is 1:1 or 1

Yep not enough coffee yet.......

now its coming up with -1.5%

Mark Miller wrote:Rick,

I put in your numbers at the TCI site and it looks like 15.241% slippage if i put everything in right.Try it also and see if you come up with the same thing.

Later Mark.

X2, that's exactly what I got as well. Our 8" Chance converter had 5%.......

I MUST JUST HAVE A BAD AZZ CONVERTOR

..or you rpm number is wrong, hard to read a tach at the speed...................this is where a playback type is very usefull.

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

I had to use just the single 1
to get what they came up with

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

I see right around 4%, its a bit snug but the deal sure works. With a lower slip % the car might want a steeper gear though..........its a balance act, but one that's just as important to get the car down the track as an engine's power output is important as well.

bruno wrote:I MUST JUST HAVE A BAD AZZ CONVERTOR

Nick if you doing the math off the hose , that number may be correct if your running a tight NOS converter.........

I wouldn't think you could achieve a slipage rate less than 0%???

Mine figured out to -1.121

IDT-572 wrote:

bruno wrote:I MUST JUST HAVE A BAD AZZ CONVERTOR

Nick if you doing the math off the hose , that number may be correct if your running a tight NOS converter.........

Nick's got one of then new fangled Jap overdrive converters..........

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

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

The Toyota core S98 unit is pretty bad ass, kind of in between a 9" and a 9.5, allows use of the good internals an 8" uses.

The harder I spin mine the harder it locks up, a 7400 rpm shift will rip your head off lol.

I want to say this is the same style unit Blake ended up with after 5 tries lol. Doug uses one in the Banana as well. They are not cheap but the converter is no plce to skimp, especially in a car with glide.