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Torque slippage question

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Post  bbf-falcon July 28th 2010, 1:47 pm

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 Question

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Post  dfree383 July 28th 2010, 2:08 pm

http://www.tciauto.com/Pages/418/calculators.aspx
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Post  Mark Miller July 29th 2010, 12:49 am

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.

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Post  richter69 July 29th 2010, 1:05 am

That's way too much IMO, 8" has no place in there.
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Post  bbf-falcon July 29th 2010, 5:11 am

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 Rolling Eyes

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Post  dfree383 July 29th 2010, 6:50 am

Same Problem here, My 8" is at 28%..... Shocked . RC budget is low here this year too, No O freakin' T at work. Mad
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Post  richter69 July 29th 2010, 8:15 am

also what kind of rpm drop on the shift?
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Post  bruno July 29th 2010, 8:33 am

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

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Post  dfree383 July 29th 2010, 8:40 am

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

not enough Coffee yet?
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Post  bruno July 29th 2010, 8:43 am

what input do i need on my tranny gear ?

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Post  dfree383 July 29th 2010, 8:48 am

high gear is 1:1 or 1

Yep not enough coffee yet.......
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Post  bruno July 29th 2010, 8:57 am

now its coming up with -1.5% scratch

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Post  Nevs July 29th 2010, 8:59 am

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%.......
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Post  bruno July 29th 2010, 9:10 am

I MUST JUST HAVE A BAD AZZ CONVERTOR Twisted Evil

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Post  richter69 July 29th 2010, 9:19 am

..or you rpm number is wrong, hard to read a tach at the speed...................this is where a playback type is very usefull.
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Post  bbf-falcon July 29th 2010, 11:59 am

What did you type in for trans. ratio? I put 1 to 1 and it just said nan Rolling Eyes What is a realistic % slippage number for my combo Question

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Post  res0rli9 July 29th 2010, 12:21 pm

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

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Post  richter69 July 29th 2010, 12:43 pm

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

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.
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Post  IDT-572 July 29th 2010, 1:27 pm

bruno wrote:I MUST JUST HAVE A BAD AZZ CONVERTOR Twisted Evil

Nick if you doing the math off the hose , that number may be correct if your running a tight NOS converter......... Cool
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Post  dfree383 July 29th 2010, 1:31 pm

I wouldn't think you could achieve a slipage rate less than 0%???
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Post  IDT-572 July 29th 2010, 1:31 pm

Mine figured out to -1.121 Shocked
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Post  richter69 July 29th 2010, 1:31 pm

IDT-572 wrote:
bruno wrote:I MUST JUST HAVE A BAD AZZ CONVERTOR Twisted Evil

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

Nick's got one of then new fangled Jap overdrive converters.......... Laughing
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Post  feetfirst July 29th 2010, 2:59 pm

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 Very Happy
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Post  Wheelie58 July 29th 2010, 7:27 pm

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

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Post  richter69 July 29th 2010, 7:38 pm

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.
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