Sorry, I might not be able to make it in tomorrow. I might be trading my car in, but I will try to make it if everything falls through though.

 

Thanks for the food and hookup on the dyno guys! Took a few photos and movies that you can view at http://phat.onestop.net/dyno

 

Wow, those results don't really look right. Do they still need to do some calibration on the Dyno? Most Z's baseline around 220+ WHP ...

Are the numbers SAE corrected?

 

I don't know, they said it's just the way the dyno is designed.

 

it was a dyno pack, not dyno jet.

 

Hey guys,

Just responding to your questions regarding the dyno runs:

Our dyno is a Mustangdyne Dyno. This is a true loading dyno, where you enter the vehicle weight and the dyno uses a dynamic braking system (basically a big electric motor) to "load" the car (basically add road and wind resistance) aka real world driving conditions (As an extreme example just think of the differences when you're accelerating with you wheels up in the air and when you are accelerating up a hill).

Since our particular dyno is an AWD setup, the 350Z's were tested with all 4 wheels spinning at the same speed - and this is the only true method to simulate 100% real world conditions. Many vehicles, for example the E46 M3, cannot even be tested properly without all 4 wheels spinning on a dyno despite that fact that is it a RWD car.

For those of you who have dynoed on the Dynojet, you may have come across instances that when you pull the car off the dyno and turn VDC Back on, the car starts to shudder and the "slip" light flashes continously until you get up to a certain speed. This is because the traction control, even though off, is still interpreting slip at the front wheels.

The 4WD and the proper loading causes consistently lower dyno number than compared to say a dynojet, which many Z owners have been testing on.

211whp is very respectable, this translates to about 230-235 whp on a Dynojet. My G35 made 217whp with Y-pipe and Fujitusbo catback, and it did 242whp on a dynojet. Compare this to a stock Subaru STI which makes 224awhp on our dyno.

I might also mention that in our experience, the tune between a non-loading dyno and a loaded dyno (ie Mustangdyne, Dyno-Dynamics, etc.) is very different. In our experience an 11:1 A/F ratio on a dynojet translates to over 12.5 A/F on the streets (very unsafe on most turbo cars), whereas the Mustangdyne, which simulates true loading conditions, has virtually an identical dyno/street AF. Unfortunately we have not had the opportunity to see the changes on a 350Z/G35 as we don't have a wideband hooked up to our cars, but this has been seen consistently on WRX/STIs, EVOs, etc. This is further backed up by the fact that I have many times seen 350Z/G35's making higher and higher numbers on each "baseline" run even though rational logic would theorize that the car should actually lose power as a result of heat soak!

Hope this clears up some confusion. Thanks!

Cheers,

Gary
GruppeS

 

I'd like to add another interesting tid-bit:

The Fujitsubo cat-back and Y-pipe setup which we tested to yield 1-2 HP on the dynojet, actually made about 9whp while loaded up properly.

Fujitsubo stated that they also develop their products on a loaded dyno.

I believe (although I have not tried to test this theory) that it is possible that an unloaded car simply is not pushing enough exhaust gas to make use of Fujitsubo's larger piping diameter design. Perhaps this may account for some of the "0 HP gains" on many components that have been tested by others?

Cheers,

Gary

 

Thanks for the post Gary. It helped clear things up for me.

So when's the Dyno Day group buy?

 

I'd be in for a lil meet - dyno day too!

Thanks for the post Gary ... it helps to know more information about the process!

 

Hmmm, I am interested to see what my car would do on that dyno. Also curious to see if "under load" my A/F is still as rich as it is on a dynojet.

 

Hi,

Generally we see about a full point A/F difference between the dynojet and our Mustangdyne.

If you've been tuned on the road or on a loading dyno, there should be a fairly large difference!

Thanks,

Gary

 

Hey Gary, let me know when you are doing some free dyno runs for FI'ed cars.

Lou

 

Hey Gary,

I spoke to someone regarding a dyno day at your place... and he said he will relay the info to you. Anyways, i'll try and swing by one of these days to get more details and i will set up a dyno day for the 350z group...

PM me if you need to get a hold of me...

Thanks,
Henry