[quote=Alchemi]I know nothing of engines at this level, but are those normal bsfc figures for this sort of monster? they look really high?
Might be some more tune left in it? [/quot
We made several pulls, adding fuel (methanol) each pull. It just kept making more power the more fuel we threw at it. The bsfc numbers said it was fat, but the power just kept going up. We finally hit a point where peak torque stayed the same.
This shows the value of dynoing a motor. I was certain i knew roughly where the tune should be. I had run a calculation on a web site that said a .117 main bypass would be close. I started at .108 and ended at .092! That means i pushed about 16 percent more fuel at it than my already supposedly rich point of .108.
Also we found and fixed oil leaks that could have cost me a weekend.
Without seeing the results of the unexpected high horse power at 7200, i could have chased the tuneup at the track and never figured it out because of false assumptions i had about what the motor wanted and how high it would make power.
Yep, that is the value of spending quality time on the dyno. It is a great tool for finding problems and finding power. The track is also a great tool for figuring out what works and what doesn't work in terms of getting the power to the ground. Now that you have the engine dialed in you should be more productive at the track figuring out how to put it to the ground. That torque curve should be friendly to a torque converter and drivetrain. Just a big mountain of torque. And now that you know where the power curve is you can select the best gear ratio for the car. I bet you pick up some ET and speed given the new knowledge. Looks like you'll need a huge by huge fuel pump and fuel delivery system. That engine is sucking down the fuel!
