Z1 states 50 miles on their car when this pull was made. Could be something as simple as bad gas from the dealer just like JoeyD said earlier.

So the dip is supposed to be knock then? Come on guys that could be any number of things (tach signal loose, gummy injectors, etc.). You want to measure knock get the proper equipment on a load bearing dyno at varying engine speeds.

In a knock event where timing is pulled you will see some indication on the A/F curve(abruptness) and it looks pretty smooth on the Z1 graph.

I'm not saying that its not possible I'm just saying that these types of statements can get taken too far on very little evidence.

Side Note: Much respect to Berk for there excellent testpipes on the S2000. :)

GTM graph with knock response. (red lines)
http://i313.photobucket.com/albums/l...70Z/2ndrun.jpg

It's hard to tell without seeing these cars in person. But the AF will not always change when the ECU pulls timing. These motors might just be very sensitive to knock levels. Remember that the ECU is using a narrowband microphone to measure the characteristic sound signature knock gives off, but isn't a direct measurement of knock.

Hi Tomatoevo! Greetings. I guess you guys already know us from the S2000 world. Your S2000's as well is very prone to pinging & knocking even with the stock ECU. I have had nearly stock cars ping away on the dyno with nothing more than intake/header/test pipe/exhaust.

Time will tell if the 370's are as knock sensitive as I think they are.

Hmm, you are going out on a bit of a limb to call that knock so early in the game and without any real data other than a blip in a dyno curve...

Exactly. That's why I'm posing the question here. What does that blip look like to you?

Double Down Motorsports will be back to back dyno testing our 370Z HFC's later this week. We'll get some real answers from DDM pretty soon.

SWEEEET!!!!!!

Before i was set on the 370Z i was going to get a G37 sedan, and the Berk HFC's would have been my first mod.

Assuming everything goes well at the Dyno, when do you expect the 370Z HFC's will be ready to order?

I'm going to say that it might be knock or an oversensitive knock sensor....but who knows...could be many things including very slight loss of traction on the dyno or the "driver" adjusting his right foot. I do have to say it looks an awful lot like timing is being pulled...

Can't argue with that, S2K's tend to lean out with basic modifications on stock tune.

breaks loose in third? huh...?

+1

Need more info.

What does VSA stand for?

^ Its Nissan's term for their traction/stability program.

Vehicle Stability Assist maybe?

And disabling it let the motor work harder?! Interesting.

Not really. If it detects wheel slippage it will cut the throttle. It's just Nissan's nomenclature for "electrical traction control". Goes by the name of DSC, TRC, E-Diff, etc. But it's all the same thing.

Your foot (gas pedal) isn't actually connected to the throttle plate. It's all done by electronics. Hence the term DBW, "drive by wire".