Posted By: bill_greenwood
Still missing 2 tenths??? - 06/24/12 07:23 PM
To recap, I changed convertors 2 years ago leading me to pick up .05 on the 60', but lose 3 mph and .3 overall. With my first convertor and 4.88 gears, the car was routinely 11.35-11.40 at 118-119 mph. Trap rpm was 7200, which it would routinely hit well before the strip and simply keep climbing the torque convertor from 1100-1200' or so until the stripe.
When I changed the convertor (TCS 8") from approx. 4200 stall out to 4700, the car immediately picked up .05 in the 60', but I found it struggling to pull in high gear. Trap speed immediately dropped to 115-116 and only hitting 66-6700 in the lights. ET dropped back to 11.65-11.70.
As my old gear set was in really bad shape, and I now had 500 rpm to play with, I switched up to 5.13's in the hope of getting some of my ET back. Here's where things stand after a good weekend where we put 10 good passes on the car-
60'- 1.58
330'- 4.650
1/8- 7.291 @93.2
1000'- 9.60
1/4- 11.56 @ 114.02
I had a couple of little issues dog me, but over 10 passes, the car is definitely more consistent than it ever has been, but it's still hitting the rev limiter well before the stripe and then climbing the torque convertor (i.e it is still actually pulling). My puzzle is that it should have (IMO) came back to the 11.30's but hasn't.
One clue- it seems to recover "softly" on the shift. Any ideas?
Shifting at 6800, BTW.
When I changed the convertor (TCS 8") from approx. 4200 stall out to 4700, the car immediately picked up .05 in the 60', but I found it struggling to pull in high gear. Trap speed immediately dropped to 115-116 and only hitting 66-6700 in the lights. ET dropped back to 11.65-11.70.
As my old gear set was in really bad shape, and I now had 500 rpm to play with, I switched up to 5.13's in the hope of getting some of my ET back. Here's where things stand after a good weekend where we put 10 good passes on the car-
60'- 1.58
330'- 4.650
1/8- 7.291 @93.2
1000'- 9.60
1/4- 11.56 @ 114.02
I had a couple of little issues dog me, but over 10 passes, the car is definitely more consistent than it ever has been, but it's still hitting the rev limiter well before the stripe and then climbing the torque convertor (i.e it is still actually pulling). My puzzle is that it should have (IMO) came back to the 11.30's but hasn't.
One clue- it seems to recover "softly" on the shift. Any ideas?
Shifting at 6800, BTW.