RB stroker torque converter info with results
#2349344
08/06/17 10:26 AM
08/06/17 10:26 AM
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Joined: Oct 2008
Posts: 411 Harleysville, PA USA
Tommy D
OP
mopar
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OP
mopar
Joined: Oct 2008
Posts: 411
Harleysville, PA USA
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Long story short, I put a 496" RB in my 69 Road Runner. It was exactly the same combination as I ran with a std. stroke 440. The old combo ran a best of 11.17@ 120.5 mph. With the additional 60 or so cubic inches, and a switch from ported and polished 452 heads to Super Stealth (CNC heads)...I could only run 11.55 @ 117 MPH. I suspected a converter issue as I did switch to a new converter when I installed the stroker motor. When i ordered the converter from a reputable company in PA, I told them that the car is mostly street driven, but does see the track once or twice per year. The original converter (10") had a stall of 3800 RPM. It was loose at low RPM, and loose at the top of 3rd gear. I suspected a problem when I noticed the car running only 117 MPH, but spinning to 7000 RPM in doing so.
I called around to a number of companies looking for the right new converter. Eventually I settled on Frank Lupo's Dynamic 9.5" unit. It cost me $699 delivered to my door. I had it in one week. I installed it last Wednesday night, and ran the car at Cecil Co. yesterday.
What a difference!!! The car ran it's best 60' and ET of all time. It's also much tamer on the street as it is tighter down low and at top end.
Below is a comparison of the best passes on the stroker motor. First with the old converter, and the second is with the Dynamic. Thank you Dynamic. I would suggest Dynamic to anyone with a heavy street strip automatic car!
Old 10" 60' 1.671 330 4.741 1/8 7.352 MPH 93.61 1000' 9.625 ET 11.551 MPH 117.49
Dynamic 9.5" 60' 1.593 330 4.561 1/8 7.072 MPH 98.05 1000 9.238 ET 11.071 MPH 122.89
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Re: RB stroker torque converter info with results
[Re: Tommy D]
#2349396
08/06/17 12:21 PM
08/06/17 12:21 PM
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Joined: Jan 2003
Posts: 14,531 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,531
So. Burlington, Vt.
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As you discovered.......with the wrong converter(especially when it's really wrong), it's pretty hard to overcome the loss of performance it brings to the combo.
Depending on the way the car is set up, I feel it's usually the #2 item on the list of importance.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: RB stroker torque converter info with results
[Re: J_BODY]
#2349468
08/06/17 02:04 PM
08/06/17 02:04 PM
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Joined: Feb 2005
Posts: 20,272 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,272
PA.
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Transmission Specalties missed mine by 60 rpm when I sent mine in to have adjusted this year but knowing your combo, past ET's, and having RacePak info helps a lot. I love how they cut it apart and clean it and call to talk to you the next day. A few hours later it's on the truck headed back to me
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: RB stroker torque converter info with results
[Re: Tommy D]
#2349770
08/06/17 10:52 PM
08/06/17 10:52 PM
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Joined: Jan 2003
Posts: 31,200 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,200
Oregon
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...Thanks. Funny how there's so little discussion about this topic. If I can pick up 5 tenths, and 5 mph from a converter swap, how many others are out there that could benefit from an improved converter?? It would take lots of HP, and $$ to gain that kind of improvement by looking towards the engine alone. I agree but most casual racers aren't going to go to the work of testing converters. The converters are expensive to buy and they aren't much fun to change, especially at the track. Some high end bracket cars are set up with sliding mounts and stuff like that so the converter can come out a little easier but for most guys you are laying on your back in the heat and dirt getting a bath from hot tranny fluid. Other thing is that unless guys have a racepak or some other data recorder they don't really know what their converter slip is. Without the data it is harder to justify spending $700 plus a full day under the car changing the converter.
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Re: RB stroker torque converter info with results
[Re: Tommy D]
#2349785
08/06/17 11:19 PM
08/06/17 11:19 PM
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Joined: Jan 2003
Posts: 14,531 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,531
So. Burlington, Vt.
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...just out of curiosity, what is the number 1 item? The motor obviously....... It's pretty tough to reach a certain ET goal If you don't have the power to weight ratio to get it done. However....... If the converter sucks, as in the case of your first one...... Then upgrading the converter gets moved into the number 1 spot........ Cuz extra power never fixes a crappy one.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: RB stroker torque converter info with results
[Re: Tommy D]
#2349799
08/06/17 11:31 PM
08/06/17 11:31 PM
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Joined: Aug 2006
Posts: 2,563 God's Country Maryland
GODSCOUNTRY340
master
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master
Joined: Aug 2006
Posts: 2,563
God's Country Maryland
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...Thanks. Funny how there's so little discussion about this topic. If I can pick up 5 tenths, and 5 mph from a converter swap, how many others are out there that could benefit from an improved converter?? It would take lots of HP, and $$ to gain that kind of improvement by looking towards the engine alone. My concerns would be why you only picked up a tenth in the quarter. You added a stroker engine, Stealth heads and went from 11.17 with your stock stroke iron headed 440 to an 11.07 with your stroker with Stealth heads and you're happy with that? Maybe I'm missing something here but I would have expected quite a bit more from a stroker engine than 1 tenth of a second.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: RB stroker torque converter info with results
[Re: GODSCOUNTRY340]
#2349809
08/06/17 11:43 PM
08/06/17 11:43 PM
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Joined: Aug 2003
Posts: 43,718 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,718
Bend,OR USA
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My calculations show .48 ET gain and 5.4 MPH gain
Last edited by Cab_Burge; 08/06/17 11:44 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: RB stroker torque converter info with results
[Re: Cab_Burge]
#2349838
08/07/17 12:31 AM
08/07/17 12:31 AM
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Joined: Aug 2006
Posts: 2,563 God's Country Maryland
GODSCOUNTRY340
master
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master
Joined: Aug 2006
Posts: 2,563
God's Country Maryland
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He said his old combo ran 11.17 and the new combo ran 11.07, that comes out to a tenth in my math.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: RB stroker torque converter info with results
[Re: GODSCOUNTRY340]
#2349916
08/07/17 04:23 AM
08/07/17 04:23 AM
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Joined: Aug 2003
Posts: 43,718 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,718
Bend,OR USA
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He said his old combo ran 11.17 and the new combo ran 11.07, that comes out to a tenth in my math. The old stock stroke motor ran a best of 11.17, the new stroker motor with that same converter ran a best of 11.55, the new motor was blowing through the old converter
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: RB stroker torque converter info with results
[Re: Tommy D]
#2349986
08/07/17 11:50 AM
08/07/17 11:50 AM
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Joined: Aug 2006
Posts: 2,563 God's Country Maryland
GODSCOUNTRY340
master
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master
Joined: Aug 2006
Posts: 2,563
God's Country Maryland
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Tommy D, Thanks for the added info, that explains the difference. I'm sure your new stroker will have your car deep into the 10's when you get finished sorting it out. A low 11 second street car is a rocket and will scare the crap out of most people, especially the person in the front passenger seat. Keep up the good work.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: RB stroker torque converter info with results
[Re: Tommy D]
#2350087
08/07/17 02:44 PM
08/07/17 02:44 PM
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Joined: Aug 2006
Posts: 2,563 God's Country Maryland
GODSCOUNTRY340
master
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master
Joined: Aug 2006
Posts: 2,563
God's Country Maryland
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A good tail wind will put you in the high tens. I foresee 10.7's in your future.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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