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Re: Acceptable Converter slip numbers
[Re: 540dust]
#1526103
10/31/13 09:17 PM
10/31/13 09:17 PM
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Joined: Apr 2009
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Toronto
mshred
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Quote:
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.
This is what I hear alot, and I can understand that too.
But my converter never 60'ed where it should have without changing alot on my engine to get it there. I wonder if I had gotten it loosened more like it needed for off the line performance if slip would have gotten worse?
My biggest concern is my low mph and not even being able to get close to the speeds I need to run the e/t I want to
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Re: Acceptable Converter slip numbers
[Re: mshred]
#1526104
10/31/13 09:46 PM
10/31/13 09:46 PM
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Joined: Nov 2005
Posts: 656
Kokomo, IN
540dust
mopar
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mopar
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Kokomo, IN
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It shouldn't necessarily be less efficient at a higher stall speed. A good converter manufacturer can give you a lot of options now-days.
Well as long as the combination works together, ..the engine rpm range and the converter slip/efficiency gives you a matching range then you're good. Making all that match is easier said than done but there are some good converter builders out there that can really get you close if they have all your engine information.
Last edited by 540dust; 10/31/13 09:52 PM.
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Re: Acceptable Converter slip numbers
[Re: 540dust]
#1526105
10/31/13 10:06 PM
10/31/13 10:06 PM
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Quote:
It shouldn't necessarily be less efficient at a higher stall speed. A good converter manufacturer can give you a lot of options now-days.
Well as long as the combination works together, ..the engine rpm range and the converter slip/efficiency gives you a matching range then you're good. Making all that match is easier said than done but there are some good converter builders out there that can really get you close if they have all your engine information.
Well I spent the coin and gave them every last bit of information (the good converter company) and it just doesnt seem to working for my combo.
I think im going to be trying a different one for next season...I would like to try and get my slip numbers lower in hopes that it will improve the cars performance
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Re: Acceptable Converter slip numbers
[Re: Hutch]
#1526107
11/01/13 05:52 AM
11/01/13 05:52 AM
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Joined: May 2004
Posts: 3,210
robin hood country
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From what you have posted about your car over the last few weeks, it seems like your car lacks power. I would think better heads, would be money better spent than a new converter. More power will loosen it up anyway. Your car is a little heavy and your refusal to uncap the exhaust is also holding you back . To get 10's in a 3400# car, you will need around 122 min. good luck 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
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Re: Acceptable Converter slip numbers
[Re: markz528]
#1526108
11/01/13 06:52 AM
11/01/13 06:52 AM
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Joined: Mar 2007
Posts: 1,608
Rudolph, Ohio
moparguy7074
top fuel
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top fuel
Joined: Mar 2007
Posts: 1,608
Rudolph, Ohio
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Quote:
9" Dynamic flashes 5800 to 6000 rpm. best 9.61 @ 193.2 mph.
Slips less than 5% per data recorder.
Are you sure this is right? 193 MPH??? 
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Re: Acceptable Converter slip numbers
[Re: moparguy7074]
#1526109
11/01/13 10:34 AM
11/01/13 10:34 AM
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Joined: Aug 2006
Posts: 290
Cincinnati, Ohio
d7cook
enthusiast
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enthusiast
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Posts: 290
Cincinnati, Ohio
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My engine. 452, 10.75-1, cnc Edelbrock performers, scott brown cam about 600 lift, 260ish at .050 112 lobe separation.
My car: 3600 race weight, 4.10 gears, 9x29 slicks.
Converter: 8" PTC as tight as they can make it. It stalls at 5000. Best ET is 10.94, 122 mph, about 6500 rpm at the traps. I think that comes out to 11-12% slip. The 60' times are low 1.5's.
I sent it back to PTC thinking it was too loose and they said it was as tight as it can be, only option was to go to a 9".
Previously I had an engine in the car that ran 10.60's at 127, 6800 rpm, with 1.48 60'. That combination still calculates out to the same slip.
I hope this helps.
1967 Coronet, 1989 Daytona tube chassis.
Former cars, 66 Charger, 67 R/T, 69 Coronet, 67 Dart GT.
-Banned for life from V8Buick.com-
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Re: Acceptable Converter slip numbers
[Re: BradH]
#1526112
11/01/13 11:41 AM
11/01/13 11:41 AM
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Joined: Jan 2009
Posts: 1,044
Victoria, Australia
Ian
super stock
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super stock
Joined: Jan 2009
Posts: 1,044
Victoria, Australia
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i run 141 and the tach shows 7600 with 4,33 and 28 .4 inch 275 radial pro ,not sure on slippage but seems to work well its a 9 inch 4400 asp .1 .37 60 ft 6.0@113 9.57@141 , i had a 8 inch stalled to 5200 asp in went 1.46 6.3@111 and 9.82 @136
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Re: Acceptable Converter slip numbers
[Re: Hutch]
#1526113
11/01/13 05:01 PM
11/01/13 05:01 PM
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Toronto
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Quote:
I read where you said." I can't run the MPH to get the ET I want". The converter is not going to make up for something you don't have. Your continual focus on this and this alone will not be a magic fix but a major letdown in my opinion if you think 4% will benefit you with an active stator converter. You see all these numbers that get thrown out there, but many are not telling you about their combination or even do many know what type of converter they even have. I can show you slip numbers that are less than 0% on a data logger but does that mean the car is faster because of it. hey don't think im joking, this thing would actually show the turbine going into an overdrive of almost .5% I had a car this summer that had only 300rpm drop on the gear change, we shifted at 7600 and it fell to 7300 and crossed the line at 7400. I figured for sure that we could improve with a tighter stator which I installed over the winter. The car now this year dropped from 7600 to 6800 and the car lost 1 tenth and 8mph but the converter was better at the top by 4% . It actually went from 6% to 2% up top. Its a spragless piece and that's why the numbers are so low to begin with but still, it doesn't make too much sense at this point.
Hutch
Hutch, I understand what you are saying, and its not like im looking to get a tighter (stall wise) converter at this point because of it.
I am running an 8" 53-5400 stall...It need an advanced cam, a dual plane intake, and a low gearset to get the stall where it was supposed to be, even after a re-stall (5500 rpms, and it still doesn't hit that)...I am not going to spend another $500 plus shipping back and forth...I am just looking at getting another converter made altogether...$400 custom converter, 9-9.5", 5500 stall, and the guy who I am thinking of seems to nail the stall pretty dead spot on every time...A1 was off by 600rpms, and still off even after the re-stall....Will a converter that slips less hurt me? I have no idea, but at this point, its one of the only things left I can try
At this point, I don't know what else to change...The bottom end of my motor was assembled properly, everything on top of that has been checked, and even though my heads are iron, they FLOW. The trans and vert are coming out AGAIN, trans will be refreshed, and converter will be changed...I don't want to think its converter either, but at this point im not sure what else to try. Between that and getting weight off this car im hoping it will help me reach my goals
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Re: Acceptable Converter slip numbers
[Re: FlyFish]
#1526114
11/01/13 05:03 PM
11/01/13 05:03 PM
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Toronto
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Quote:
Quote:
Quote:
It shouldn't necessarily be less efficient at a higher stall speed. A good converter manufacturer can give you a lot of options now-days.
Well as long as the combination works together, ..the engine rpm range and the converter slip/efficiency gives you a matching range then you're good. Making all that match is easier said than done but there are some good converter builders out there that can really get you close if they have all your engine information.
Well I spent the coin and gave them every last bit of information (the good converter company) and it just doesnt seem to working for my combo.
I think im going to be trying a different one for next season...I would like to try and get my slip numbers lower in hopes that it will improve the cars performance
Have you looked into the transmission yet? The reason I ask is my transmission died just before the division finals this year (had this trans about 8 years). I had it rebuilt by a guy that KNOWS Mopar transmissions. After the rebuild the car picked up a CHUNK of ET. My 60' times went from the low 1.50's to 1.45 and I picked up almost a tenth in the 1/8 mile. Just something to consider.
As others have said, I think you are going to need to look for more power to get into the 10's. Porting the heads would be a good place to start (not sure if you have yet).
Heads are ported already
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Re: Acceptable Converter slip numbers
[Re: mshred]
#1526115
11/01/13 07:00 PM
11/01/13 07:00 PM
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Joined: May 2003
Posts: 6,571
Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
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Downtown Roebuck Ont
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I don't suppose there is a chance that this combo doesn't make the numbers you've been told it does or makes them but not where you think? Off by 600 rpm is a lot once for a brand name company but to miss twice would at least make me go  . Not that it can't happen but I would be going back and confirming that all the info I sent was accurate ie dyno sheets, head flow charts, cam card etc. Kevin
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Re: Acceptable Converter slip numbers
[Re: Twostick]
#1526116
11/01/13 07:22 PM
11/01/13 07:22 PM
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Joined: Sep 2013
Posts: 168
Moparts
SSDart
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Moparts
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nevermind
Last edited by SSDart; 11/01/13 07:23 PM.
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Re: Acceptable Converter slip numbers
[Re: 540dust]
#1526118
11/01/13 08:12 PM
11/01/13 08:12 PM
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Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
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Quote:
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.
The Slip numbers that typically referenced are NOT launch numbers. As those numbers Will be higher. They are also involved in torque Multiplication.
The Slip numbers that that most look at here are the Across the stripe MPH vs RPM at Speed, not at launch. Two different animals.
Keep the Launch slip numbers out of this 
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Re: Acceptable Converter slip numbers
[Re: Twostick]
#1526119
11/01/13 08:48 PM
11/01/13 08:48 PM
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Toronto
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Quote:
I don't suppose there is a chance that this combo doesn't make the numbers you've been told it does or makes them but not where you think?
Off by 600 rpm is a lot once for a brand name company but to miss twice would at least make me go . Not that it can't happen but I would be going back and confirming that all the info I sent was accurate ie dyno sheets, head flow charts, cam card etc.
Kevin
When I got the converter made it was supposed to go to 5500...I got it, and it went to 5000...Sent it back to get loosened, it then went to 5300...I put a dual plane intake on, a low gearset in the trans, and advanced the cam 5 degrees and it finally left how it should, but still mph's like crap.
Could the engine be down on power? Sure, anything is possible....But at this point, I highly doubt it...I triple checked the info I gave to the converter company as we spoke more than once on the phone (multiple times actually), and they didn't really seem too concerned since I was a stock/super stock racer
Not going to pay another 600 bucks to get it re-stalled on my dime when I can just try another converter.
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Re: Acceptable Converter slip numbers
[Re: jim sciortino]
#1526120
11/01/13 08:49 PM
11/01/13 08:49 PM
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Toronto
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Quote:
A friend of mine is a national record holder in SS. He's cycled a number of converters through his combination and the converter that set the record was borrowed from a friend and built for a different combination.
He deals with ONLY the top converter guys in the country.
Now what does THAT tell you???
That even the best can get the converter wrong?
I know they can't get things perfect, which is totally understandable by me...Im not complaining about that...But when your spending TOP dollar for a converter, and it is supposed to be a reputable company, well after twice im kinda left going huh?
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Re: Acceptable Converter slip numbers
[Re: SSDart]
#1526121
11/01/13 08:51 PM
11/01/13 08:51 PM
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Joined: Apr 2009
Posts: 3,427
Toronto
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Quote:
nevermind
again questioning how I do things...I just don't know jack apparently in your eyes...
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