I was wondering if anyone knows if the powerband power is quite a bit different from engine stand dyno and rear wheel dyno? Shouldn't you go by the rear wheel powerband when selecting your torque converter and gears ? Inquiring minds want to know.
The torque converter will influence rear wheel HP as it has a lot to do with power train losses. The torque converter multiplies engine torque until it is coupled, so it plays a big part in rear wheel power. Our cars can lose as much as 20% and more from crank to rear wheels. Just the weight of the converter can impact that. The 9.5" converters that Tri shield Performance sells are easily 12lbs or more lighter than a stock 13" converter. When a converter manufacturer builds a custom converter they use the engine dyno sheet (if available) because that is what the converter sees as an input. Car weight and gearing also play a big part.
I see so beause it is before the drive train the torque converter goes off of those numbers. So it is pretty important that you have the engine dynoed first?
The input for the torque converter is the engine crank shaft, so yes, where the engine torque peaks and the shape of the torque curve is very important to selecting the correct converter. If you build a new engine, spend the extra money to have it broken in and dynod. For a stock engine, or an engine that is modified, power can be estimated. If you need a converter, look at this, http://www.v8buick.com/index.php?threads/tsp-9-5-street-strip-converters-lifetime-warrantee.147066/