converter builders
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TECH Enthusiast
Joined: Dec 2012
Posts: 563
Likes: 3
From: Wilson n.c.
converter builders hi guys i want to know whats the difference between a 4l80e and a turbo 400 torque converter.i have seen most nos cars with 4l80e run 6.80 on motor and around 5.70 on nos same weight vehicle very close engine specs same nos hit but the car with the th400 runs 6.20 motor and 5.20 nos now thats a big jump.i also been looking at alot of nos cars with 4l80e and weight from 3200-3800 all run 10.80 on motor and mid to low 9s on nos is that 10.80 a stopping point on the 4l80 or what
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Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Well, exactly what are you asking?
By your title you want to know who builds converters.
By your 1st sentence you you want to know the physical difference between a 4L80e and TH400 converter.
Then you mix in 1/8 and 1/4 times of different cars in a very confusing way and without any clear question.
What are you asking?
By your title you want to know who builds converters.
By your 1st sentence you you want to know the physical difference between a 4L80e and TH400 converter.
Then you mix in 1/8 and 1/4 times of different cars in a very confusing way and without any clear question.
What are you asking?
You're comparing apples to oranges.
You can't compare completely different cars and hope for the same results, even if they are similar.
Suspension setup, track location and climate, tuning, engine build differences (engines vary even when built identically), etc.
Also many cars equipped with a 4L80E would by definition be more street oriented so the converter may be tamer.
The only way to compare would be to try the same car with both transmissions and have a converter built to the same specs.
I've done this and the 4L80E actually went slightly faster ET and MPH in the 1/8th mile. I contribute it to air density and possibly a slightly more efficient converter although it was built to identical specs by the same builder.
The car was 3600-3700 lbs with a 496 BBC running 6.70s IIRC.
You can't compare completely different cars and hope for the same results, even if they are similar.
Suspension setup, track location and climate, tuning, engine build differences (engines vary even when built identically), etc.
Also many cars equipped with a 4L80E would by definition be more street oriented so the converter may be tamer.
The only way to compare would be to try the same car with both transmissions and have a converter built to the same specs.
I've done this and the 4L80E actually went slightly faster ET and MPH in the 1/8th mile. I contribute it to air density and possibly a slightly more efficient converter although it was built to identical specs by the same builder.
The car was 3600-3700 lbs with a 496 BBC running 6.70s IIRC.
I saw very little diff switching from a 400 to 80E, and I was a lot quicker than 10.80-diff converter specs, different weather, track conds., even bad settings (line pressure, etc) on a controller could all affect times-even poor install, driveline angle, could impact it
To many fairy tales floating around, lol
To many fairy tales floating around, lol
