hammeron

dropped by my local dyno shop this morning, to see how
the stock whipple tune handled the change in compression
ratio. The SAME physical whipple tune was used for both
dyno runs, the only thing different is the short block itself.
Same dyno was used for both setups.


Here are the numbers:

Whipple tune, 9.8:1, 3.375" pulley.

419 rwhp / 423 ft-lbs

---------------------------------

Whipple tune, 8.7:1, 3.375" pulley.

412 rwhp / 410 ft-lbs


Stock 9.8:1 CR, Stock whipple 10psi (gen1) tune:



Aluminator 8.7:1 CR, Stock whipple 10psi (gen1) tune:
note: The a/f sensor fell off the tailpipe at the end of this run.

candymanjl

that's awesome, typically every point drop in compression is about 10hp. looks like you just lost a little torque, nothing that can't be cured with more boost

now that you have the new block are you going for more power?

Riptide

A 10psi whipple @ 9.8:1 is only making 419whp?

onederful100

i believe Hammer is on a Mustang dyno.


great info, Hammer. very useful for me and others considering this swap.

Local Yokel

That and I read it as those numbers are on the Whipple tune, not a custom tune...

hammeron

no i don't think so at this point. the goal all along was simply to beef
up the motor. i think that's been accomplished now for the most part.





some folks dyno higher than me, maybe i just have a factory freak (on the low side) or else it's just the way the different dyno's are setup. i am mainly interested in the relative numbers and the air/fuel ratio's.



it is a dynojet, but of course the value is in the comparison between
before's and afters.

hammeron

yep whipple tune and it's a dynojet

onederful100

yes, the important part is the comparison between the blocks.
and the result of the comparison is very good.

hammeron

i agree onederful!

another thing i learned today is that my whipple tune really is
centered at 10psi (which it should be of course). i put the 12psi
pulley on for an optional run and the results were not very good.
it ran leaner than i expected and it didn't do well in the power
department.


i think with the 12psi pulley and a custom tune (like Simon1 wants), this baby will make some respectable power.

BruceH

IIRC Hammeron has a gen 1 too. The 10psi pulley makes 2 more psi on a gen 2 and most peoples numbers are from gen 2's.

Nice to see such comparable numbers.