UpRev w/Shawn Church (Church Automotive)

370Z Purist

I didn't see this mentioned before; Dynapacks measure from the hub. They completely eliminate the weight from the wheels and tires, which sap a lot of horsepower. This is why a lighter, smaller diameter wheel will push better numbers when compared to a heavier, larger diameter wheel when performed on a Dynojet/Mustang dyno, which includes the wheels. If even more of the mass is centered versus being closer to the barrel, you'd "unlock" even more wheel horse/torque.

Does that mean that a dyno with rollers is a more accurate depiction of the car's actual wheel hp/torque numbers? I would suppose so.

__________________
-Phil

"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."

state

Sure, that's one way to look at it. I really tried to say all of this up-front (it's in my first couple posts). I didn't want this to become a "max HP on the dyno contest".

We can agree that under the same conditions, on the same dyno, you can measure tuning changes. I ran more than a dozen runs. The consistency was remarkable. The only changes came by way of map changes (mostly timing and fuel). What's represented here is my first run and my last run. That's it.

I'm still very curious about typical results with such changes. It seems most are fixated on a number that's too big. What about my baseline and final run? If that's typical, I'd say we have a really great bang-for-the-buck proposition with this setup. My seat dyno says these are real changes! For those of you in SOCAL, I ran a few canyons from Las Flores to Malibu Canyon over the long weekend -- it flies (but I did see oil temps close to 245! with 88 deg F ambient). Thoughts?

state

How many of you make use of multiple maps? I left with five new maps.

1) Performance
2) Stock
3) Fuel economy
4) Valet mode (3500 RPM); apparently doubles as "launch control"
5) Anti-theft

* from highest-to-lowest performance is the typical map arrangement

I don't see using anything other than #1. Can anyone that has actually used the fuel economy map vouch for a significant difference? I'm guessing it wouldn't be so different than staying out of big throttle angles and in closed loop operation on the highway (I'm not sure where it breaks out of closed loop, but guessing near 60-65 MPH). My real-time indicators show 28+ MPG at an indicated 65 MPH. I really doubt I could sustain that for a long trip!

The valet mode is great, but the launch control function seems clumsy to me (compared to what I was used to on something like my R32).