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Converter slippage
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DRR Pro
Picture of 00 DEAD ON
posted
What converter slippage do most try to achieve? How can you tell if you are driving through the converter???
PS. Is 15.5% to much??
Thanks in advance


Brian Mollison
2013 American Dragster
2020 Sumerduck Dragway VA Top ET Champion
2017 Sumerduck Top ET & SSS Track Champion
2017 MAC Top ET Track Champion
2009 Sumerduck Dragway Va Top ET & IHRA SSS Track Champion
2008 IHRA Division 1 Top ET Bracket Final Runner-up
2007 Colonial Beach Dragway Top ET Track Champion
 
Posts: 1029 | Location: Stafford, Virginia | Registered: October 03, 2006Reply With QuoteReport This Post
DRR Sportsman
Picture of 329L
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quote:
Originally posted by 00 DEAD ON:
What converter slippage do most try to achieve? How can you tell if you are driving through the converter???
PS. Is 15.5% to much??
Thanks in advance


I went 4.47 @ 154 and the FTI 93B converter slipped 18%. That is with mt3195s (110.5) 4.11 gear and dextron vi trans fluid and 1900lbs. This is in the 1/8 mile.


Jeremiah Hall
 
Posts: 712 | Location: Evansville, IN | Registered: February 24, 2010Reply With QuoteReport This Post
DRR Elite
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Not if it runs it’s quickest/fastest. Wink

My stuff slips less than 10%.
 
Posts: 13522 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Pro
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Mine was 18.8% for 1/8 mile at the last race of 2021. The DA was below minus 700’. My car is geared 1/8 mile only.

I want to be on the ragged edge of driving through the converter and it slipping in the very best air that the car will run in. What happens by doing that is as the weather cools off, the engine makes more power, and the engine will drive through the converter, thus helping it be consistent versus getting faster. I want my RPM to drop between 500-800 on the fallback of the gear change
 
Posts: 2507 | Location: 53056 | Registered: December 30, 2009Reply With QuoteReport This Post
DRR Pro
Picture of Goob
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Spragless Coan built / FTI tuned 8" at 16%


"Despite the high cost of living, it remains popular."
Dave Cook
N375
 
Posts: 1704 | Location: Indy | Registered: November 21, 2008Reply With QuoteReport This Post
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quote:
Originally posted by markemark:
Mine was 18.8% for 1/8 mile at the last race of 2021. The DA was below minus 700’. My car is geared 1/8 mile only.

I want to be on the ragged edge of driving through the converter and it slipping in the very best air that the car will run in. What happens by doing that is as the weather cools off, the engine makes more power, and the engine will drive through the converter, thus helping it be consistent versus getting faster. I want my RPM to drop between 500-800 on the fallback of the gear change


My humble opinion is that while this may not always be the fastest setup.....it tends to be very predictable and consistent.


Foxtrot Juliet Bravo
 
Posts: 6421 | Location: Illinois | Registered: July 08, 2004Reply With QuoteReport This Post
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quote:
Originally posted by 1320racer:
Not if it runs it’s quickest/fastest. Wink

My stuff slips less than 10%.
Thru the 1/8th..l
 
Posts: 1265 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post



DRR Sportsman
Picture of FTI
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There are a lot variables to play into answering if a slip percentage is "ok" or not. perfect world, car setup correctly I would mid single digits is target. BUT if you are strictly bracket racing, as others mentioned a looser(higher slip%) converter will be more forgiving and more more consistent at the cost of some ET & MPH. Gearing and track distance are also a commonly over looked variable when considering slip%. A car setup for 1/4 racing and only slipping 4-7% in the quarter, is very likely to see slip% numbers in the mid to high teens at the 1/8.

Some other common data points that can be used to determine converter performance are RPM fall-back @ gear-change & RPM flash @ launch & stall

-Dalton


FTI Performance
Competition Converters and Racing Transmissions
"Some call it cheating, we call it the competitive edge."
www.FTIPerformance.com
info@ftiperformance.com





 
Posts: 165 | Location: Deland, FL | Registered: August 31, 2009Reply With QuoteReport This Post
DRR Top Comp
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23% in this video, 3500 lbs crossing 6600 rpm at 109 mph 3.89 gear 28" circumference tire.

Same TSI spragless converter slips 3.5%, 3200 lbs, 7400 rpm, 114.50 mph 1/8 mile 5.29 gear, 28" tire.

 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR Top Comp
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It's so smooth, you could win a Super Pro bracket race on a 8.5" wide tire on this car, dial'd 6.40.
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR S/Pro
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quote:
Originally posted by FTI:
There are a lot variables to play into answering if a slip percentage is "ok" or not. perfect world, car setup correctly I would mid single digits is target. BUT if you are strictly bracket racing, as others mentioned a looser(higher slip%) converter will be more forgiving and more more consistent at the cost of some ET & MPH. Gearing and track distance are also a commonly over looked variable when considering slip%. A car setup for 1/4 racing and only slipping 4-7% in the quarter, is very likely to see slip% numbers in the mid to high teens at the 1/8.

Some other common data points that can be used to determine converter performance are RPM fall-back @ gear-change & RPM flash @ launch & stall

-Dalton


Agree but left out some items worth mentioning.

- % slip vs wheel speed - if more slip equals more wheel speed it's probably a good thing and usually means the converter put the motor in a happier power range
- same slip with more wheel speed - better converter design hands down!
- reducing top end slip does not mean more MPH, it can but not always and usually it doesn't unless the converter was out to lunch to start with
- if you are comparing one car to another with regards to converter slippage, you have to ensure you are comparing apples to apples, if you assume they use the exact same motor and the cars weigh the same but one uses a 31" tall tire and the other a 33" tall tire they won't be equal. A converter is a load sensing device, add more load you get more slippage, take away load and you will drop slippage, more HP, lower gearing, more weight, more drag will all add load and therefore increase slippage

- lastly and the most important one is - The Cone Crusher has more slippage between his ears than any converter on the planet! Cool
 
Posts: 2161 | Location: Tewksbury, MA,USA | Registered: November 03, 2000Reply With QuoteReport This Post
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Falling of chair laughing
 
Posts: 13522 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Top Comp
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That's wrong, more hp isn't more load.

Going up a hill is more load all things equal, as an example.

Going up a hill with more hp is less load all things equal, not more.

Common sense.

TOP 38 is clueless again.
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR S/Pro
Picture of "The Bender"
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quote:
Originally posted by Mike Rietow:
23% in this video, 3500 lbs crossing 6600 rpm at 109 mph 3.89 gear 28" circumference tire.

[FLASH_VIDEO]<iframe frameborder="0" height="411" src="https://www.youtube.com/embed/aiWe8G-7B3g" width="730">[/FLASH_VIDEO]


28" circumference tire? That's a 9" tall tire. Are you using go cart wheels?


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.
 
Posts: 3100 | Location: Yes | Registered: July 08, 2009Reply With QuoteReport This Post



DRR S/Pro
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quote:
Originally posted by "The Bender":
quote:
Originally posted by Mike Rietow:
23% in this video, 3500 lbs crossing 6600 rpm at 109 mph 3.89 gear 28" circumference tire.

[FLASH_VIDEO]<iframe frameborder="0" height="411" src="https://www.youtube.com/embed/aiWe8G-7B3g" width="730">[/FLASH_VIDEO]


28" circumference tire? That's a 9" tall tire. Are you using go cart wheels?


It does in his orange cube!!! Laughing Hard

well is may be a bunch of little cubebee thingies now....
 
Posts: 2161 | Location: Tewksbury, MA,USA | Registered: November 03, 2000Reply With QuoteReport This Post
DRR Top Comp
posted Hide Post
quote:
Originally posted by "The Bender":
quote:
Originally posted by Mike Rietow:
23% in this video, 3500 lbs crossing 6600 rpm at 109 mph 3.89 gear 28" circumference tire.

[FLASH_VIDEO]<iframe frameborder="0" height="411" src="https://www.youtube.com/embed/aiWe8G-7B3g" width="730">[/FLASH_VIDEO]


28" circumference tire? That's a 9" tall tire. Are you using go cart wheels?


28 / 3.14 = 8.917 if ya wannabe technical Laughing Hard

88 / 3.14 = 28.025
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR Top Comp
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Top38 and his ilk will need a box of kleenex, when The Ripper wins a Super Pro bracket race on a 8.5" wide tire dial'd 6.40. Laughing Hard
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR Top Comp
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If your going to pretend intelligence to cover a mistake at least make it appear cerebral.

28 x 3.1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 = 87.9645943005142........


.
Dave



F J B

 
Posts: 4480 | Location: Earth | Registered: February 08, 2006Reply With QuoteReport This Post
DRR Top Comp
posted Hide Post
quote:
Originally posted by imakehp:
If your going to pretend intelligence to cover a mistake at least make it appear cerebral.

28 x 3.1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 = 87.9645943005142........


Mistakes and errors are not the same, know the difference.

Errors are things you don't know.

The wrong word slips out, misspoken.

Nobody was pretending, I was showing you the difference by example.

You claiming I was pretending, is a projection of your approach.
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR Top Comp
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Nope...you were just wrong.


.
Dave



F J B

 
Posts: 4480 | Location: Earth | Registered: February 08, 2006Reply With QuoteReport This Post
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