Originally Posted by TurboS13Hatch
Ok... what's your point about the turbo? Lag isn't all about turbine and compressor efficiency.. If you were to take this turbo, and put it on a engine with more exhaust energy, it would spool a little faster. Engines with higher rod/stroke ratios, tend to have softer exhaust pulses, and therefore, less exhaust energy to present to the turbine. The drawback is more lag.. the payoff is higher RPM, due to lower piston speeds, and higher volumetric efficiency. We wanted a turbocharger that would make 600+ without blowing 5000 degree air into the motor. We could have used a 35R, or a 61, but I didn't want to do that. I wanted to try this out... So far, it's working great for us.. almost 400whp at 14psi, and almost 3K worth of great powerband.. Not too shabby if you ask me.
hey travis,
glad you survived the storm!!
now down to business....exhaust pulse strength has almost no effect on turbo spool time. the only thing that siginificantly changes spool in normal operating conditions is mass flow. exahust pulse strenght has little to no effec ton spool time. how is it that 10.5:1 and 7.5:1 cr engines have the same spool time? becasue exhaust pulse strenght has no effect. your turbo is laggy becaue there just isnt enoguh mass flow trhrough the tubine to extract work out of. so the turbine has to wair for more mass flow (higher rpm) to generate enoguh shaft pwoer to drive the compressor.
nice project tho!!