Been trying to catch up on some updates.
Since getting the car on the road I've felt my Mast crate motor ran way too rich. This was based on:
> How bad it stunk up the garage when working on it and idling it for any length of time
> Horrible mpg (best tank was 100% freeway super easy driving and 15mpg, most tanks 10-12)
> Black soot all over the tail panel after 1-2 tanks of gas
So last Thursday I took it over to Westech to have them tune it on their chassis dyno. I'm not sure if the car runs any better or not and it's too soon to judge if the MPG improved. It was interesting that the Mast factory tune was spot on for full throttle at a very rich 11.5-12.0 AFR. Initially Eric at Westech was shocked at how rich that was but as soon as we started adjusting towards 12.5-12.9 AFR the motor made less power.
With the Mast tune the car made 505 hp to the wheels and 493 torque. After realizing they couldn't improve it Westech's final tune made 497 hp and 482 tq. Interestingly the Westech tune made 10-20 less hp and torque over the entire RPM range... They said that the difference is small enough to be chassis dyno related...
Here is some video from the day.
My old zz4 motor was chassis dynoed at 280 hp and 326 tq. So the new set up makes 80% more hp and 51% more tq. Doesn't drive as nice as my old EFI ZZ4 nor get as good of gas mileage though.
Here is an old video of the ZZ4 pull.
I attached to this post a PDF of the detailed numbers comparing the Mast tune and the final Westech tune.
For comparison here is the flywheel dyno from Mast:
I'm not sure what to make of the engine falling off about 500 RPM sooner and the fact the Westech tune made less power.