Quote:
Originally Posted by laynlo15
HUH, I have been there and the converter always helps out down low but will cost you on the big end. I think I brought this up in a different post. Man what a 60 ft though and that's how it usually works. I remember going from a 4000 to 5000 converter in my drag car, 60ft was killer went a little fast but slowed down on the big end mph. Maybe with more hp in your up coming mods that converter will really shine. That's one of the best 60 ft times on this forum. Sorry to hear the 02 sensor messed with ya. Still really respectable time for your mods.
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I could see losing mph in an old school converter that doesn't lock up. That makes perfect sense. If anything, with a modern lock up converter, I should have gained a bit of mph in the 1/8th from leaving under power and run the same mph up top or a little better locked up.
I was able to get the converter to lock in third sometimes right after the 2/3 shift. Sometimes it would lock up when it wanted to in 3rd. It did lock every time before 80mph. There was nothing I could do to lock it in 2nd. I tried everything. I need this thing to lock right after the 1/2 shift. Sucker was leaving hard though. That is for sure. I would almost bet a paycheck it was lifting the wheels.
If it is the converter that is costing me 4mph then it is coming out as soon as I can get it out. There is absolutely no reason on having a converter to get a cool 60ft with no real gain in the 1/4. I was gaining 27mph on the back half two weeks ago on the stock converter and the exact tune I started with this week. I did drop the 1/2 and 2/3 mph down in anticipation for the converter not being locked. I think it averaged 23-24mph on the back half this week. The converter was definitely locked by then. I really hope the lack of mph has something to do with the bad 02. I guess I will get the 02 fixed and get it back on the dyno to see where it is at.