60 ft. and 330 ft. times compared to 660ft.

Discussion in 'PSI Superchargers Tech Questions' started by DISCODEAN, Apr 12, 2006.

  1. DISCODEAN

    DISCODEAN Member

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    My 60 is .990 330 is 2.81 660 is 4.37 at 156 .I had faster times than the guy i ran untill 660 he ran 4.25 at 168. I have 2 questions ,I went to a 36 in tire and picked up 3 on the 60 ft. but lost over 7 mph! I shift at 7300 and the computer says that the converter stalls at 7050 off the line.Is it better for me after high gear to be slipping through the converter and rpm's higher ?? after it shifts it stays at 7050 for about 2.00 seconds . is this good or bad??am I getting alot of converter slippage because rpms arent above 7050 and this is the reason for the slower 660 ft?? What would happen if I put in a tighter converter ?? like a 5800?? slow it down? or pick it up?? does the motor like to be tugged down with the converter locked up? or do i need to lean out my high side a bunch more? egt's read 1050. but i think the fuel is burning in the pipe ,because the plugs aren't even losing any cadium !! thanx for any input !! dean
     
    #1
    DISCODEAN, Apr 12, 2006
  2. Mike Canter

    Mike Canter Top Dragster
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    I think a tighter converter will help you a lot. A 5800 stall maybe a tad low I would guess around 6200 would be best. There are a lot of things that go into getting the right converter. I would recommend calling Kenny Ford at Performance Torque Converter (PTC) in Alabama at 256.383.6868 the guy is a wizard with converters. He can take yours and adjust it. The other option is to sens you converter to Neal Chance and have him make it into a converter that is now bolted together and allows you to open it up and change parts to change the slippage and the stall. Neal charges more but then you don't have to keep cutting the converter apart. Also if something breaks in the tranny then you can open up the converter and clean it out.

    The more tire you put on a car the more you are going to make the converter slip. The same thing happens with a clutch and it has to be adjusted.

    I think you motor would perform better under more load. When you put a alcohol motor under load the flame pattern around the plug changes from being a flame pointed down the cylinder to a dougnut shaped flame pattern around the plug and the increased load will actually change the AFR and will probably start burning the cadium off the plugs. I would leave the tuneup alone until you have talked it over with Kenny or Neal's son.
     
    #2
    Mike Canter, Apr 13, 2006
  3. Lethal Threat Racing

    Lethal Threat Racing New Member

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    I went to a tighter converter and changed the ratio's in my Lenco drive. I run BBC set up with 29 lbs boost and a 33.5 tall tire with a 3.90 rear screw and run 1.05 60 and 4.25 avg 660 at 165 to 168 mph. I changed to a tighter converter left at 3500 ran 1.001 60 4.18 170 660 and did not change the tune up one bit. The old converter was slipping to 6500 or so and now the new one locks up around 4800 to 5000. I shift at 7800 and cross at 8300.No high speeds or anything fancy.
    I know a chassis car is different but the motor does not know that.


    Blownvette
     
    #3
    Lethal Threat Racing, Apr 13, 2006
  4. OUTLAW

    OUTLAW New Member

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    I've done a bunch of converter racing with 3 sp lenco's and powerglide's
    It sounds like your converter is WAY too loose, if the engine rpm is flatlined at any point you are losing et and MPH. With the 3 speed (with the same ratio's you have) I usually saw around 600-800 rpm drop during the gear change. Be prepared to loose some 60' but you should make it back up from 100'-330'. If anything, the tighter converter makes it more manageable on the starting line. As far as companies I would HIGHLY recommend Coan. Jason Coan is excellent to work with. I had PTC build AND rebuild a converter and ran 4.40's with 20% slippage, Jason Coan built one for the same combo and the car ran 4.20's with 5% slippage and the EXACT same tune-up. Kenny is a nice guy but for high powered stuff Coan is the way to go. And another thing, the bolt together is DEFINATELY worht the extra$$$!
    Just my .02
     
    #4
    OUTLAW, Apr 17, 2006

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