Re: Torque slippage question

bbf-falcon on July 29th 2010, 10:59 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

res0rli9 on July 29th 2010, 11:21 am

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

richter69 on July 29th 2010, 11:43 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

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.

IDT-572 on July 29th 2010, 12:27 pm

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......... Cool

dfree383 on July 29th 2010, 12:31 pm

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

IDT-572 on July 29th 2010, 12:31 pm

Mine figured out to -1.121 Shocked

richter69 on July 29th 2010, 12:31 pm

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.......... Laughing

feetfirst on July 29th 2010, 1:59 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

Wheelie58 on July 29th 2010, 6:27 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

richter69 on July 29th 2010, 6:38 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.

Mark Miller on July 30th 2010, 12:27 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 on July 30th 2010, 4:12 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 on July 30th 2010, 6:09 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 on July 30th 2010, 7:08 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 on July 31st 2010, 7:18 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