Damn, dude! Nobody was attacking Shawn. Perhaps Hooked-on-Phonics is for you!

You can't tune a stock S2000 without something add'l- VAFC, e-Manage, AEM EMS, etc.

 

Just the whole dynapack bashing...that is all

 

IMO all this is hearsay and so repetitive. I hope this explanations helps for those who are unaware.

Not all Dynapack's read high because the dynapack that I own reads very close to the local NorCal dynojets and K&N Engineerings Dyno Dynamics in SoCal but not so close Shawn's Dynapak. BTW I've been and tuned at Church so I have experience with their dyno as well. I highly recommend Chruch Automotive tuning. I would not go anywhere else if I was a SoCal resident and did not own a dyno. When Kpro was still a new product Doug from Hondata and Shawn worked with us on our 600hp RSX. Very great people and knowledgable in their craft.

Back in August 07 we tuned our LS1 swapped 300ZX on our dyno to prepare for Sport Compact Car's Ultimate Street Car Challenge and made 505hp. A couple days later, down at K&N we baselined 499, 500 & 501hp respectively on their Dyno Dynamics dyno. Temps in Socal that day was about 5-10 degrees hotter and there was a bit more humidity. Question: Does this info really inform you of anything other than the fact that the numbers are close?

The initial baseline isn't what's most important, it's the gain or loss measured after mods that's information valued. This is why it's generally recommended to return to the same dyno for accurately measured gains/losses.

My stock 06 s2k, it made 211hp. Here's a dyno comparison stock vs ECS/VAFC/Open air box (something I was testing)

So take a Honda spec'd measurement of 240hp at the flywheel account for some drivetrain loss. 211hp doesn't sound bad does it?

Now let's take this dyno off Hondata's S2k Reflash page tested at Church.
Yes, it may read in the 230ish range peak on a 240rated 06 S2k, but the valuable information is the midrange gains from the reflash. This is why the cursors are set at the point of interest, midrange not peak. What you see is a true measurement of 16.7hp 14.4tq gain!

You're correct in that the dynpack measures from the hub and not the tire. There are advantages and disadvantages of both hub style and roller style dynos but I'm not going to get into that.

On a Dynojet swapping tire compound, changing tire pressures or changing wheel diameter ie: rim sizes/tire height can change results. Also changing gears ie: from 4th to 3rd will also change power results.

On a Dynapak, you don't have wheels. The rpm pickup is based on a gear ratio setting to where you can sync hub rotation to engine rpm, unlike the inductive similar to a timing light that Dynojet uses. So if you performed a pull in 4th, then tried to do it in 3rd the rpms would not match. With that said you can see that my ratio is very close to Neutered Sputniks. You did your pulls in 4th correct?

With all this said, I really like both brands of dyno's because each have their own unique features. Currently Dynojet has a load bearing roller dyno out so part throttle tuning is now possible. They've been pushing me to buy one. Hi Dynojet It was also nice to see Dynapak at SEMA and they've corrected the controversial "flywheel torque" "flywheel hp" text on the dynosheet. Yes it was only a text change, measurement calculations were always at the hub. Hi Dynapak!

Hopefully I explained this in a PC way. You see why there's so much hearsay?