drive line power gains/loss due to trans change

[bob]

Here's the dyno readout for my TKO600. It sucks half the power that the TH400 did, only 12% compared to 25%. I did not expect that great a difference, but the numbers prove it. I gained 60 lb/ft of torque and almost 50 horsepower to the wheels.
two dynos on the same basic engine with different transmissions showing the drive line losses
Here's what we ran yesterday:

SBC Chevy, 4.030 bore
Scat 3.75" cast crank
10.4:1 HE pistons
Lunati single pattern hydraulic roller cam: 274* adv, 218* @ .050", LSA 112*, .492" lift
Comp 1.6 full roller rockers, for .520" lift
AFR 180 heads with 71cc chambers
Weiand #8000 3/4" rise dual plane manifold
OEM Quadrajet (Lars tuned)
MSD distributor with 6A box. Initial 13*, total 37*, mechanical advance only
1 5/8" full length headers into 2 1/2" pipes with X-pipe & Magnaflows

above a manual transmission(tko600)
below an automatic transmission (TH400)OK, here's my chassis dyno readout:

OEM TH400
4L80 HD Intermediate drum
34 tooth sprag
Red Alto clutches
Colleen steels
2.75/1.57 gearset
Trans-Go kit

3.36 rear end
27" diameter tires
3600 lbs actual weight

http://garage.grumpysperformance.com/index.php?threads/matching-the-combo.11020/#post-48707

 

[87vette81big]

1/4 Mile Performance is a better benchmark.
Manual transmissions consume less engine torque and HP.
Another way to look at things is what did the TKO & clutch swap over cost ?
$ Wise.
Then what did the Single 1 Hp cost Vs $ each ?
Camshaft swap & Big Tube Race Headers tend to do more for less $.