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| Choosing stall for converter on new build https://www.slantsix.org/forum/viewtopic.php?t=51897 |
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| Author: | DARKDUSTER [ Mon Apr 29, 2013 8:16 am ] |
| Post subject: | Choosing stall for converter on new build |
Thanks to all the great info on this forum my new build is running on the stand! Just want to choose the best stall converter on the edge of street/highway driving & the odd trip to the track. '73-74 engine; head ported & polished;1.70&1.44 valves; roller tip rockers 1.6 Int. 1.5 Exh.; Erson 280/270 cam 108 LSA installed @ 4.75 deg advanced; .030 pistons with rotating assembly all balanced; block & head machined to 10.3 SCR/8.4 DCR (measured); Holley 390 4BBL; Clifford heated intake w/shorty headers 2" dual exh. w/X-pipe; GM HEI conversion; NGK ZFR6FIX-II plugs; dist. recurved w/ initial 14 deg.; mech starts @ 1300-1350 rpm, vac starts 2300, total advance 53 deg. @ 2650-2700(have another dist. to try if curve is not good);904 auto; '70 Duster should be in the low 3000 lb. area????; 3.23 -8 3/4 posi. Now using the calculator links, 65 mph w/25.5" tires, puts me @ 2766 rpm. Would 2700 stall work or is it to close? How much heat would build if a guy was @ 50/60 mph for a while? Who is the best @ the moment, Midwest, Edge Racing, or....? Thank You in advance for all input, DARKDUSTER |
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| Author: | Doc [ Mon Apr 29, 2013 10:46 am ] |
| Post subject: | |
As you know, You want the converter to not slip at your highway crusing RPM. We also know that the stall ratings we often see are usually for V 8 application and will usually stall 200 to 400 RPM lower when used behind a SL6. With that said... a conservitive choice would be a 2800 - 3000 stall converter. next choice... 3000 to 3200 range. Many other factors come into this decision like the coverter's shell size and your willingness to "work with" a high stall unit, during street use. DD |
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| Author: | Sprag [ Mon Apr 29, 2013 11:03 am ] |
| Post subject: | |
All I can add is a recommendation for Midwest, only it's not exactly current info. Several years back I asked them if they could build something for an oddball combo I was building and they responded with a converter that would 'flash' somewhere around 2800-3k (depending on track tune etc) on the same slicks I used on the street for god knows how many miles where it would stay tight on the highway at 2600. It took some heinous beatings under a 4200lb slug that whole time with nary a hiccup. Couldn't be happier for $425 almost ten years ago and I think it was a major contributor to that pig's 12.60 et's. |
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| Author: | Dart270 [ Mon Apr 29, 2013 1:00 pm ] |
| Post subject: | |
If it were me, I would call Midwest on the phone. Tell them your engine/car setup and ask for 2800-3000 stall in a 9.5" converter. I have had great luck with them and prices will not be beat. They have made a large number of Slant converters. I have heard Edge is also very good. 2800-3000 may sound high, but the new converters (post 1980s) are quite efficient until you stand on it. I have run up to 3600 stall on the street and even cross country and on road courses and had no heat problems. I always run a trans cooler (around 8-10" X 12"). You will lose in the range of 0.5-2 MPG on the hwy compared to a stock converter. Lou |
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