I dynoed my Z doing six 5th gear runs on a Dynapack Dyno (this is the hubcentric one). I did this at a place dedicated to motorsport that supports several racing teams. They certainly knew what they were doing.

Once we got the temp sensors right matching the dyno temp sensor to the intake temps we were measuring with a Consult II we got some good, repeatable pulls. I ended up with 262 rwhp@6400rpm and 250ft/lb @ 4000 rpm.

Engine Mods as follows:

Nismo CAI
ProFlow Bored ThrottleBody
Crawford Cast Plenum
Crawford Headers
Crawford Cats
Nismo Exhaust
Technosquare Tuning

Below is my dynoplot in Purple, a pretty much stock Z in Yellow (a 2004 SCCA T2 car), and a rev-up 2005 G35 in blue for comparison. You can see the differences.



One interesting note -- I was running a grounding kit. The guys told me that they had repeatedly seen grounding kits actually cost 2-4 hp on Zs and G35s. We removed it on my car and sure enough -- it was costing me 2 hp. The guys hypothesize that some sensor somewhere in the system does not get a full 0 volt ground at higher revs and that the ECU is set to compensate for it. When you install the grounding kit it does actually hold it to a 0 volt ground and causes a slight misread by the ECU. Strange -- but this has been documented by these guys on mutliple cars, on multiple occasions.

 

Hmm -- the Dynoplot size is reduced by my image hoster -- how do I attach a larger image?

 

Looks good and very interesting w. the 3 overlays (barely visible).
Where did you have the dyno test performed?

If you'd like PM for my e-mail address ... I'll host the pics for you.

 

Here you go ...

Dyno Plot

 

please explain how you matched the temps.

 

We had a Consult II and were taking the intake temp reading right from the MAF in real time. We saw that it was reading about 96 F at idle, but would climb quickly to 118 F at WOT as the revs climbed (this is a function of standing still in a garage and having just a few high power fans to simulate -- poorly -- the airflow a car would see). We put the Dyno's temp probe in near the air intake and fiddled with it until we could get it to read within 5 F of the MAF. This allows the Dyno to get the most accurate hp reading.

 

I am interesed to see what people think might be going on w/ torque at 4k to 4800. It would be awesome to fill that hole in. The guys at the shop thought it was caused by some harmonic in the intake system that was slowing the air down (they had seen similar things in modded cars before). In otherwords -- at those particular revs -- one or more of the mods is not playing nice with the others.

 

Thanx, skrill. man, my dyno guys have never even mentioned matching the temps.

"I am interesed to see what people think might be going on w/ torque at 4k to 4800. It would be awesome to fill that hole in. The guys at the shop thought it was caused by some harmonic in the intake system that was slowing the air down (they had seen similar things in modded cars before). In otherwords -- at those particular revs -- one or more of the mods is not playing nice with the others."

You mean that dip in your torque btwn 4-5k? ya, that's unusual and interesting. damn, i learned a lot from your dyno experience...temp matching, effect of grounding kit, breathing mods interaction. My dyno guys just do the dyno, hand you the graph, and take your money. Thanx again for sharing.

 

Was that your stock Z? Or another Z?

BTW nice numbers! 20hp 20tq is about right from what I have read. BUT I am curious what a tune with TS ecu can do? maybe 10 more?

 

I went to Willow Springs today for a track day. It was a good day (except for a issue I had with boil clutch fluid -- at least I think that is what it is).

Had a chance to sit down and discuss my dyno sheet with Unitech Racing guru Jackson Stewart. He said that torque dip is caused by a resonance harmonic in the air flow and that it is just part of how the 350 VQ behaves. He showed me the dynos form the Unitech Grand Am Cup engines which were bench dynoed and they similar dips at a similar range. He said that the race teams have spent a lot of time and money trying to get rid of it -- but they can only minimize it. They now have it down to just a minor dip.

So mystery solved.

 

I have a TS flash -- so that is with flash.

The stock Z was not mine. But it was not totally stock -- it had a custom built crazy cat-back exhaust and a customer ECU flash (by Technosquare). Those two mods are the only two allowed for SCCA Touring 2 (T2) class. So the yellow "stock" Z was the best such Z they had tested.

 

did your clutch pedal lose pressure? that's what happens to mine when it gets hot.

 

Look here for the full write up

https://my350z.com/forum/engine-and-drivetrain/125149-anyone-ever-boiled-their-clutch-fluid-help-long.html

 

umm...i had my Z dyno'd today and between 4k and 4800 was my max torque....

 

so what is your max hp with all those mods??? 263?

Thanks

Jay

 

Real nice dyno results with our package, the ECU reflash and just 91 octane fuel.The high RPM gains are impressive as well
The dip you guys are referring to we believe is the cam timing crossing over from advanced to retard we have seen this on all our cars. The new cams that we have been working on plus some fiddling around with the cam timing has improved this transition quit a bit.

 

Crawford cams? o.o... Um can you make some high lift cams for those that want a little more umph? (270/270 series or more)