SpecRacer.com

With this scale it is not really easy to see...but it is getting REALLY boring to do this most years...

Both of the last two years at least one of the engines was mid window (althought with the new window that is less than 1 hp different). Anything that is out of the window gets brought back in (generally a small improvement can happen still after our break in and dyno). It's your reward for a Runoffs Podium!

http://sccaenterprises.com/updates/SRF% ... 0graph.pdf

remember 4000 to about 5500 is the usable range...at least that is where Mike D sets "lug" and "shift you fool" lights on his car...

Hi Erik,

Could you share the precise peak horsepower and torque numbers and associated rpm levels for all three engines? Very impressive how close the three engines are.

new guy question, so when I look at the graphs, what is the appropriate shift point? If you were using a shift light, where would you set it? thanks Frank

FrankValente wrote:new guy question, so when I look at the graphs, what is the appropriate shift point? If you were using a shift light, where would you set it? thanks Frank

Starting in 2012, SRF rookies are limited to 3,500 RPM until they get their Regional Licenses.

You hear a lot of folklore on this, and the curves tell the story. Winding it out to redline is not, itself, a way to find more power. But it might put you onto a better part of the HP/TQ curve when you get into the next gear.

Peter,

I am afraid I need to pass...because someone somewhere, on a different dyno, at a different altitude, would compare. Apples and Cucumbers!

Frank,

Shifting...the lug at 4000 is a good deal...when I drive Mikies car I see it a lot if I am not careful; that is bad. The 5500 is intended to be a light he does not regularly see, I think 5300 - 5400 is his hot spot, but there are also parts of tracks that you will take it higher...the engine does not hate it...it HATES missed shifts.

Overall, the newer engines that have had the torque peak set to a common RPM all look just like these motors. Some on the past where "Torquers" or "Revers"...no longer.

Erik Skirmants wrote:Peter,

I am afraid I need to pass...because someone somewhere, on a different dyno, at a different altitude, would compare. Apples and Cucumbers!

No problem.

I figured the absolute numbers would be impacted by differences in altitude and other factors. I was hoping the shapes of the curves might be more robust, i.e. the rpm levels corresponding to the horsepower and torque peaks might be comparable.

Peter,

Aside from the obvious CSR knowledge and support, you are always welcome to ask Mike Davies specific questions: mdavies at scca dot com. Usually best to cc your CSR, no sense in asking a good question and the answer not being known by both parties.

Erik, clearly you and Mike (along with Shannon and Jake) have screwed up the horsepower excuse!
Those curves are truely amazing and are just one of the reasons SRF is the best racing in racing!

Maybe those curves should be posted on the "Spec" Miata blog site along with the Enterprises list price for a rebuilt motor. Ohhhhh!!!!!