I've got a 9" converter which slips 9.5% at 5.19 131mph carrying 3000 lbs with a 4.51 gear crossing 7800 rpm 1050 hp. I need that same converter to slip 6 - 7% crossing 8300 - 8400 rpm with the same 87" rollout tire at the stripe, with 137 - 138 mph power, [b]what gear will I need to accomplish this off the trailer?
I've got a 9" converter which slips 9.5% at 5.19 131mph carrying 3000 lbs with a 4.51 gear crossing 7800 rpm 1050 hp. I need that same converter to slip 6 - 7% crossing 8300 - 8400 rpm with the same 87" rollout tire at the stripe, with 137 - 138 mph power, [b]what gear will I need to accomplish this off the trailer?
5.38
8300 - 8400 rpm, I wish we were working with 9400 rpm.
So tell me something, I'm curious. What's the mph and percentage of tire growth 10% or 20%? I'm presuming it's a 35" tire Big Bubba? Correct?
January 30, 2020, 11:32 AM
jenavet
quote:
So tell me something, I'm curious. What's the mph and percentage of tire growth 10% or 20%? I'm presuming it's a 35" tire Big Bubba? Correct?
how about taking all your intelligence,data,equations and formulas and helping figure out what stator I should change to so I fall back a bit less on my shift and stay closer to 8000 on the big end...without changing gears or installing dump valves. otherwise you have been totally unhelpfull and more arguementive
January 30, 2020, 12:06 PM
Mike Rietow
quote:
Originally posted by jenavet:
quote:
So tell me something, I'm curious. What's the mph and percentage of tire growth 10% or 20%? I'm presuming it's a 35" tire Big Bubba? Correct?
how about taking all your intelligence,data,equations and formulas and helping figure out what stator I should change to so I fall back a bit less on my shift and stay closer to 8000 on the big end...without changing gears or installing dump valves. otherwise you have been totally unhelpfull and more arguementive
That's what is happening, progress is just slow moving. I'm coming up with 10% tire growth at 6% converter slip on your car at around 220 mph. That's a low percentage of tire growth for 200 plus mph which means it's a low energy loss tire, low rolling resistance - fast tire. Anyway the graph we've been dissecting is based around a 4.10 gear assuming the same tire is in play and the mph is around 223-225, this is why I asked for the mph and tire growth. The problem with merely changing the stator is you'll most likely slow down. If it doesn't bother you to slow down, you could just pour heavier oil in the transmission.
January 30, 2020, 12:16 PM
"The Bender"
FWIW the Big Bubbas are a low growth tire......and fast.
I believe he is running those
272" Spitzer 540 Chevy The Blower Shop XR1 FTI XPM Series Converter FTI Level 6 Powerglide 3.69@199 .916 60'
2017 Bradenton Heads Up Madness Open Outlaw Champ
2018 PDRA T/D #5 2019 PDRA T/D #2
2020 Retired From T/D Competition....
2020 Bradenton NMCA Hemi Shootout Winner
2021 getting back into bracket racing with a Gen3 Hemi powered 87 Cutlass.
January 30, 2020, 12:22 PM
329L
To the doubters out there. Ford had a lock up converter (AOD) 30 years ago that wasn't electronic or needed anything special. Several converter companies are working with same style setup.
Jenvet, im not sure if your stator needs changed or if you need to put more pump to it. If you are trying to change stator, I would go up 5 degrees.
Jeremiah Hall
January 30, 2020, 12:23 PM
Mike Rietow
The more precise the inputs, the more precise the outputs. It's math, Jen.
I'm having to coax the inputs out into the open.
January 30, 2020, 12:31 PM
jenavet
You dont even have my graph up..that's someone else's
January 30, 2020, 12:32 PM
jenavet
Your not going to be very precise analyzing someone else's graph
January 30, 2020, 12:44 PM
Mike Rietow
The common denominator is the tire growth. With a 4.10 gear in your car, 0% converter slip at the stripe, you cross at a lower rpm than you are now 8300 (10% tire growth), with a quicker et.
January 30, 2020, 12:56 PM
329L
quote:
Originally posted by Mike Rietow: The common denominator is the tire growth. With a 4.10 gear in your car, 0% converter slip at the stripe, you cross at a lower rpm than you are now 8300 (10% tire growth), with a quicker et.
I would love to see that thing with a 4.10 gear!!! Maybe he could try and do his Big Daddy impersonation too
Jeremiah Hall
January 30, 2020, 01:07 PM
Mike Rietow
Hypothetically, if you just changed the gear 4.10, that change will take the converter from slipping 6% to 3%. With 3% you'd cross 100 rpms higher than you are now. You don't wanna do that because you'd be going backwards, so this means you gotta change the gear and the stator, unless you don't mind slowing down. You could just poor heavier oil in it to lower the finish line rpm when it's fast out (good conditions).
January 30, 2020, 01:10 PM
jenavet
My racepak says I'm slipping at 8 to 9% not 6%
January 30, 2020, 01:15 PM
Mike Rietow
If your graph is the first post of the thread, it's slipping 6%. What are the inputs to come up with 9%? I have 7900 and 8400 for 6%.
This message has been edited. Last edited by: Mike Rietow,
January 30, 2020, 06:13 PM
Mike Rietow
quote:
Originally posted by 329L:
quote:
Originally posted by Mike Rietow: The common denominator is the tire growth. With a 4.10 gear in your car, 0% converter slip at the stripe, you cross at a lower rpm than you are now 8300 (10% tire growth), with a quicker et.
I would love to see that thing with a 4.10 gear!!! Maybe he could try and do his Big Daddy impersonation too
6.41@221 (so far) 4.11@178 off the shelf/built it myself
January 31, 2020, 06:04 PM
Mike Rietow
The Evidence is right here, the track official invented a story out of thin air to put the wagon back in the race and in the final round 45 minutes after loading his car in his trailer after being declared loser in this race you can see for yourself the Nova won.
This is the thorn Sammy can't stop scratching internet stalking for two plus years.
Sammy is no different than the liberals running a smear campaign on Trump with their fake impeachment.
January 31, 2020, 07:41 PM
Mike Rietow
We may as well get back on topic. While Sammy has been internet stalking 2 plus years, I just need to do a better job of not feeding the Liberals.
I'm working on a couple transmissions for a car we're gonna race in the DXP Street class at Lights Out. Both will have identical stator tubes, input shafts and orifice sizes on both sides of the converter, feed and lube. We're also gonna have two different rear gear ratios to work with on hand. The transmissions will have different low gear ratios. The converter will be a rare 9" Cortina core converter PTC recently reconfigured abiding to 1200hp 6800-7000 stall, originally out of a Australian Ford production car. The transmission we anticipate to run in conjunction with the lower numerical rear gear of the two will have a lower converter pressure, so I'll have data which will indicate exactly how all this plays a role on the torque converter efficiency if we aren't satisfactory up to speed, off the trailer. If we are up to speed satisfactory, I'll at the very least have off the trailer data that may be beneficial for some here.
This message has been edited. Last edited by: Mike Rietow,
February 01, 2020, 07:24 AM
Bucky
quote:
Originally posted by "The Bender": FWIW the Big Bubbas are a low growth tire......and fast.
I believe he is running those
I tried a mickey 10.5 on a 15" on the dragster and expected my rpm to be much higher than it turned out being. That tire was shorter than my Hoosier, but the rpm didn't show it. I figured that 10.5 must have been growing a good amount? I have never seen anything indicating what growth on their tires is.
This message has been edited. Last edited by: Mike Rietow, 
This message has been edited. Last edited by: Mike Rietow,