I still don't get it.
If the torque converter stalls at the engine's peak torque RPM, then maximum power will be spinning the converter regardless... A looser torque converter will allow the engine to rev higher, but wouldn't that be past the peak torque?
No, wait... I don't hit maximum boost until above 2000 RPM; the total amount of fuel injected increases with RPM, and so boost builds accordingly. While peak torque occurs lower, max boost can occur higher. Like climbing a hill, I can get over 20 PSI, but that only happens at 2200 RPM.
So a tight converter would keep you from spooling as fast, but you're still at peak torque....
Ahh, okay. You'd be putting more power to the ground with the 93%, but you wouldn't have the horsepower to do it very fast, so you would actually slow down. Like a manual in too high of a gear... Got ya...
Regardless, how bad would the affect of the 93% be on a underpowered truck? It would still probably be world's better than stock, right? What power level is recommended for use with the 93%?
I got the 18cm housing, 9 mm head, vaguely functional gauges and a 3200 RPM governor and piston pump in the wings; I could get enough power through pump tweaks to be content, right? Then it'd only get better as I go to stage two with water injection, a wastegate and POD's...
1990 D-250 Regular Cab: Tweaked injection pump, built transmission, a cataclysmic charlie foxtrot of electronics, the most intense street-ran water injection system in the country, and some more unique stuff.