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Acceptable Converter slip numbers DELETED #1526083 10/30/13 10:49 PM 10/30/13 10:49 PM
Joined: Apr 2009 Posts: 3,416 Toronto M mshred OP master
mshred OP master M Joined: Apr 2009 Posts: 3,416 Toronto	Post deleted by mshred

Re: Acceptable Converter slip numbers [Re: mshred] #1526084 10/31/13 06:48 AM 10/31/13 06:48 AM
Joined: Mar 2007 Posts: 1,608 Rudolph, Ohio moparguy7074 top fuel
moparguy7074 top fuel Joined: Mar 2007 Posts: 1,608 Rudolph, Ohio	I just figured up mine, and got 8.88%. It's an old Turbo Action 9" J converter. It stalls around 5000, I normally run around 10.70@123.5.

Re: Acceptable Converter slip numbers [Re: moparguy7074] #1526085 10/31/13 09:13 AM 10/31/13 09:13 AM
Joined: Jan 2003 Posts: 4,275 Morrow, OH markz528 master
markz528 master Joined: Jan 2003 Posts: 4,275 Morrow, OH	9" Dynamic flashes 5800 to 6000 rpm. best 9.61 @ 193.2 mph. Slips less than 5% per data recorder. 67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......

Re: Acceptable Converter slip numbers [Re: markz528] #1526086 10/31/13 10:39 AM 10/31/13 10:39 AM
Joined: Mar 2005 Posts: 1,552 Michigan K Kiddart pro stock
Kiddart pro stock K Joined: Mar 2005 Posts: 1,552 Michigan	run your numbers thru the wallace calculator www.wallaceracing.com There is a magic number i was told 5% anything over that you are leaving ET on the table Thank you Kiddart

Re: Acceptable Converter slip numbers [Re: mshred] #1526087 10/31/13 10:42 AM 10/31/13 10:42 AM
Joined: Nov 2003 Posts: 1,969 Chandler, AZ Duner top fuel
Duner top fuel Joined: Nov 2003 Posts: 1,969 Chandler, AZ	9.5" Precision Industries Viper I think it's slipping too much at 10%. Flashes to 4800 in my 4,000# pig 10.63 @ 128.33 mph last outing. (spinning - 1.60 60') When viewing the logs - my trap rpm should have been 143 mph if completely locked-up. 15 mph is a lot to give away at the stripe.

Re: Acceptable Converter slip numbers [Re: Duner] #1526088 10/31/13 11:55 AM 10/31/13 11:55 AM
Joined: Jan 2005 Posts: 3,635 Oakland, MI D dizuster master
dizuster master D Joined: Jan 2005 Posts: 3,635 Oakland, MI	You shouldn�t get too hung up on converter slip numbers. Slip isn�t always a bad thing� Remember, slip is often times just a result of the components needed in the converter to make it work right on the front half of the track. I made 3 converter changes this summer in my turbo car. I�ve seen it slip everywhere from 27% all the way down to 6%. Pump change, stator change, etc� But always the same 9.5" PTC. The best apples to apples I can give is that I ran the car at 10~11psi the first night out, and then again this summer (on accident) with a different converter. First time went 123mph with 20% slip (2.76 gear). This summer it only went 121mph but with 6% slip (3.23 gear). Even though this summer it had more gear in it and less slip, it actually hurt the acceleration of the car a bit because it locked up in high gear so hard that it pulled the motor down. The motor didn�t have enough �grunt� through the middle/top of the track to work at the lower RPM. Letting it sing a little bit from the slipping converter actually made the car faster.

Re: Acceptable Converter slip numbers [Re: dizuster] #1526089 10/31/13 12:25 PM 10/31/13 12:25 PM
Joined: Jan 2003 Posts: 6,266 Renton Washington T Triple Threat master
Triple Threat master T Joined: Jan 2003 Posts: 6,266 Renton Washington	My 8" Ultimate converter slips 12% ish can't get too exact without a data logger. -Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA

Re: Acceptable Converter slip numbers [Re: mshred] #1526090 10/31/13 12:26 PM 10/31/13 12:26 PM
Joined: Jan 2003 Posts: 1,292 Tucson AZ, M MadMopars pro stock
MadMopars pro stock M Joined: Jan 2003 Posts: 1,292 Tucson AZ,	I figured my JW converter at about 7% last time out while chasing a problem. That's with a 30" tire, 4:30 gears, 5500 RPM at the traps. 12.58 @ 106.5 MPH. My understanding is 5% to 7% is typical. [img]https://s9.postimg.cc/6fbjxzfvv/48-2016-_Drag-_Weekend-_Best-_Burnouts-lpr.jpg[/img] 73 GTX 4407278 3/4 69 DART GT 4404 SPEEDDANA 73 ROAD RUNNER 4514 SPEEDDANA 64 F100 3834 SPEED9" 75 DODGE D300 4404 SPEEDDANA 99 DODGE RAM 3500 4X4 DUALLY... ON 38"s

Re: Acceptable Converter slip numbers [Re: MadMopars] #1526091 10/31/13 12:37 PM 10/31/13 12:37 PM
Joined: Jun 2013 Posts: 240 Ft. Wayne, IN. Q QTR MILR enthusiast
QTR MILR enthusiast Q Joined: Jun 2013 Posts: 240 Ft. Wayne, IN.	Mine figured out to 5.33%. Turbo Action 10" conveter. The car is a 69 Satellite. 3850lbs with driver. 411 gears, 27" tire. Flashes to 3800rpm, 6000rpm at the stripe. Runs 12.10 at 111mph.... Last edited by QTR MILR; 10/31/13 02:07 PM.

Re: Acceptable Converter slip numbers [Re: dizuster] #1526092 10/31/13 01:17 PM 10/31/13 01:17 PM
Joined: Jan 2003 Posts: 5,486 SoCal Brian Hafliger master
Brian Hafliger master Joined: Jan 2003 Posts: 5,486 SoCal	Quote: You shouldn�t get too hung up on converter slip numbers. Slip isn�t always a bad thing� Remember, slip is often times just a result of the components needed in the converter to make it work right on the front half of the track. I made 3 converter changes this summer in my turbo car. I�ve seen it slip everywhere from 27% all the way down to 6%. Pump change, stator change, etc� But always the same 9.5" PTC. The best apples to apples I can give is that I ran the car at 10~11psi the first night out, and then again this summer (on accident) with a different converter. First time went 123mph with 20% slip (2.76 gear). This summer it only went 121mph but with 6% slip (3.23 gear). Even though this summer it had more gear in it and less slip, it actually hurt the acceleration of the car a bit because it locked up in high gear so hard that it pulled the motor down. The motor didn�t have enough �grunt� through the middle/top of the track to work at the lower RPM. Letting it sing a little bit from the slipping converter actually made the car faster. I see this alot, where a converter goes through many changes, but the outcome does not. I'm a big believer in changing the converter out with another unit...never have changes made to the same converter...JMO. Brian Brian Hafliger

Re: Acceptable Converter slip numbers [Re: Brian Hafliger] #1526093 10/31/13 01:41 PM 10/31/13 01:41 PM
Joined: Jan 2005 Posts: 3,635 Oakland, MI D dizuster master
dizuster master D Joined: Jan 2005 Posts: 3,635 Oakland, MI	I should elaborate. I wasn't chasing converter slip... I kept adding more and more boost over the last year, and the car kept making more torque. As it made more torque, the stall kept going up, so I had to take it out a few times to keep tightening it. A converter that works at 10psi of boost, doesn't work very good at 20psi. No blame to PTC at all for my changes, the car actually picked up 1 full second and 13mph since last year.

Re: Acceptable Converter slip numbers [Re: dizuster] #1526094 10/31/13 03:02 PM 10/31/13 03:02 PM
Joined: Jan 2003 Posts: 5,875 communist bloc of new jersey J jamesc master
jamesc master J Joined: Jan 2003 Posts: 5,875 communist bloc of new jersey	are you guys calculating converter slip taking into account tire growth?

Re: Acceptable Converter slip numbers [Re: jamesc] #1526095 10/31/13 03:57 PM 10/31/13 03:57 PM
Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually B BradH Taking time off to work on my car
BradH Taking time off to work on my car B Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually	Quote: are you guys calculating converter slip taking into account tire growth? Or, in the case of radial tire users, that the "squat" they have under load actually reduces the effective radius, even at speed? FWIW, my 9.5" Dynamic advertised as a 4200-stall unit flashed to ~ 4500 w/ my last 440 and calc'd slippage in the 7-8% range.

Re: Acceptable Converter slip numbers [Re: jamesc] #1526096 10/31/13 04:58 PM 10/31/13 04:58 PM
Joined: Jan 2003 Posts: 4,275 Morrow, OH markz528 master
markz528 master Joined: Jan 2003 Posts: 4,275 Morrow, OH	Quote: are you guys calculating converter slip taking into account tire growth? Mine is driveshaft rpm divided by engine rpm off the data logger. So yes. 67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......

Re: Acceptable Converter slip numbers [Re: markz528] #1526097 10/31/13 05:27 PM 10/31/13 05:27 PM
Joined: Apr 2009 Posts: 3,416 Toronto M mshred OP master
mshred OP master M Joined: Apr 2009 Posts: 3,416 Toronto	I run radial tires, so I have never accounted for tire growth. See, I always hear different things about converter slip. I have heard MANY say that under 5% slip is what you want....but then others say that 9-13% is acceptable if its what the car needs...Including the converter company who I bought mine from, who says anything under 10% is acceptable. I have calculated mine on the wallace calcs and come up with close to 10% (it was like 9.7 or 8 or something)...I have eliminated a TON of variables for my setup, and the only thing I have not changed yet is converter. I think it is slipping too much, but then others say its not...Thats why I wanted to hear from you guys what yours are like.

Re: Acceptable Converter slip numbers [Re: mshred] #1526098 10/31/13 06:24 PM 10/31/13 06:24 PM
Joined: Jan 2003 Posts: 8,028 Tulsa OK Bad340fish master
Bad340fish master Joined: Jan 2003 Posts: 8,028 Tulsa OK	My Turbo Action 8" slips 6% according to Wallace. I think it needs to be loosened up to help my launch, its a 4500 and I think a 5000 would do my 360 some good. I run a radial tire and while they are not supposed to grow I have a pic of mine on the top end and they visually look to have grown some and its not even that fast...117mph on that run. 68 Barracuda Formula S 340

Re: Acceptable Converter slip numbers [Re: Bad340fish] #1526099 10/31/13 07:04 PM 10/31/13 07:04 PM
Joined: May 2004 Posts: 3,210 robin hood country deaks master
deaks master Joined: May 2004 Posts: 3,210 robin hood country	Mine says 2.89% according to wallace. Mick 69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36

Re: Acceptable Converter slip numbers [Re: deaks] #1526100 10/31/13 07:19 PM 10/31/13 07:19 PM
Joined: Jul 2004 Posts: 487 D Dyno1 mopar
Dyno1 mopar D Joined: Jul 2004 Posts: 487	In my SS/AH car, slip is 6% according to the Race Pak. Dyno

Re: Acceptable Converter slip numbers [Re: dizuster] #1526101 10/31/13 08:54 PM 10/31/13 08:54 PM
Joined: Nov 2003 Posts: 1,969 Chandler, AZ Duner top fuel
Duner top fuel Joined: Nov 2003 Posts: 1,969 Chandler, AZ	I'm thinking about swapping out my PI converter and seeing what my Hughes does for it. It's got a much lower stall - but maybe it won't even matter since traction is always such an issue. Come to think of it... It DID go 5 mph faster with the tighter convertor, I just didn't have a 2-step at the time to build boost at the line.

Re: Acceptable Converter slip numbers [Re: mshred] #1526102 10/31/13 09:11 PM 10/31/13 09:11 PM
Joined: Nov 2005 Posts: 656 Kokomo, IN 540dust mopar
540dust mopar Joined: Nov 2005 Posts: 656 Kokomo, IN	Keep in mind more slip isn't necessarily bad. My fastest converter was 87% but the one I have now made things more docile on launch at about 92%. It's all what you are trying to do with your combination.

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