For those who didn't see it today at the event and those who couldn't make it, here it is.

 

Anyone knows how to convert this into HP?

 

Multiply by 1.341 IIRC

 

That equals 197 hp (clever me), but what is going on? US numbers are 230 - 240. That's almost 30% loss at the wheels, compared to 15% in the US. I wonder if we will ever get to the bottom of this

 

From what I've been told US dynos typically read ~10% higher than ours anyway. Add to that the fact that every dyno will be a little different and you've accounted for most of it.

FWIW it was about what I expected. The car also only has 3600km on it so a kw or two may free up yet.

A 300kw HSV Senator dyno'd 201rwkw today also just to give an indication.

 

Yeah I looked into it a little bit and as Apsilon mentioned the US dyno's are calibtrated differently. I was told about 15% on dyno dynamics.

THat with the US model having about 8kw more there you go....

 

Apps, the Senator was a 255kW version, so it suffered about 20% drivetrain losses to post a 201rwkW output.
Also, the stock S15 recorded approx 113rwkW and it is quoted in our mags at 147kw. Again, about 20% drivetrain loss.
The Z is down almost 30% from its claimed 206kW. I have a suspisison that Nissan is bullsh**ting us on the claimed output. I believe that the FairladyZ in Japan does put out 206kW using their 101 RON PULP. But our Oz spec 350Z are detuned for our crappy 95 RON PULP but Nissan Oz won't admitt to a lesser number IMO. Or maybe i'm just a conspirasory theorist at heart.

 

dude..

the dyno reading is 147.6kw at the wheels. This is how all dyno readings come out.

Nissan's 206kw claim is at the flywheel.

 

147 is pretty crappy IMO for a car quoted at 206kw. The only dyno run i can think of for my own mental comparison was my bro's stock 996 Targa at 235kw posting 194rwkw. But didnt David....aka ZZZ35....post a more respectable 155odd rwkw dyno chart??? If im mistaken here, then im inclined to believe KY350's conspiracy theory. Starting with 206KW on 100RON, then getting it to run on 95RON, something has to give, and thats kw at peak rpm.

 

Just for reference, here are my first dyno runs. The only mod on the car was AEM CAI. It had 10,000 miles and had Mobil-1 in the oil pan. My car is a 6-speed Touring.

I love that flat torque curve! Torque is the one that starts out higher and is flatter.

 

Oops, that's not bad for the Senator. Didn't sound good though IMO but then neither did the Z.

Only way your going to know for sure about the 206kw is pull the engine and dyno it which is something I'm not going to bother with. The 148kw for my car is in line with what was seen on Nathans car pre mods which is a JDM version. I don't think the difference in octane can explain it all. It would be interesting to compare the timing on Nathans JDM car to one of ours. 30% does see high but again not a lot of km on my driveline yet.

As for the difference in dynos yes you're always going to get that. Forget about the fact that one read 155rwkw (with muffler BTW) and another read 148rwkw. Dynos are only good for comparing mods to the same car on the same dyno and to a lesser extent the same type of car on the same dyno. FWIW the JDM car with cams, exhaust and another couple hundred rpm pulled ~175rwkw.

 

Settle down boys
Don,t be dissapointed at the 147kw at the wheels, its about spot on or slightly higher than normal for 206kw at the flywheel.
As has been stated before Australian & NZ dynoes factor in a 30% drivetrain loss where as US factor in 15%.
Why this is so I dont know, I beleive it has something to do with the size of the inertia wheels in US spec dyno,s.
206 - 30% = 144.2. Now that is slightly higher than we got with our JDM spec car on its 1st dyno run with 1200k on the clock. we got 141.
Our Mitsubishi FTO race car was rated Std as 147kw & the best we ever saw on the dyno was 104 after all our mods & that car won the Australian championship.
I can explain the S15 figures because we were complance plate holders for Jap spec S15,s & I can tell you there was never 35kw difference between Aus spec & jap spec cars.
With regards to the Senator I can only repeat what Jim from Croydon told me when our car pulled 175kw at the wheels.
Quote {thats about the same as a stock Gen 3 Commodore}
Based on our reading yesterday I estimate our car to be around 240kw at the flywheel +or- 5

 

Great to have met some of you on the day... sorry i had to run! It was my wife's birthday and i wasn't going to be late for lunch ...

I too was a bit disappointed and can't quite equate how a 240kw xr6turbo can pull 190rwkw while we only pull 140ish, can we have such loss on such a good drive train?

Again it just seems that the engine KW has been over-rated and is probably closer to 190KW imho (conspiracy theorist here) .

What i was impressed by was that nathan could get up to 175kw with such small mods. Exhaust, very mild cam and rev limiter isn't expensive and we're already 30KW ahead.

 

Well i can explain that one. Having a mate working at Ford, he confidently told me Ford have under-qouted the true power output of the XR6 Turbo, and slightly over-qouted the 260kw power output of the XR8, so that it still appeals to all the Aussies who continue to pioneer the 'V8 or nothing' banter.

I believe, with the strict emission controls on the Z, theres alot of power hiding in the exhaust. Hp from an intake and grounding cable is neglible IMO, go the Borla True Dual and Headers

From my personal experience with aftermarket cams, i would encourage normal road users (non-track users) to stay away. True they give u extra kw, but at peak rpm only, and at the expense of low-end power. What i really liked with the Z was the effortless low-down torque. Correct here if im wrong Nathan

 

I heard the same thing er the XR6T.

Re the cams they were *very* mild. You could barely even notice a difference in the idle so I'd be surprised if any low end loss was even noticeable.

I'm tempted to get the cams as they're probably mild enough to work with a future turbo.

 

ZEXC-33
Sorry for the slow responce but I have been flat out getting the car ready for this weekends round of the GTP Championship at Oran Park.
The cams we hve fitted to the Z are Tomei with a duration of 256deg & lift of 10.2mm compared with std 240/9.8
I do not have a scanner to post dyno sheet but it looks exactly the same as apsilons, just move the lines up just over a box on both the power & torque.
With these cams there is no noticible difference in idle & the motor is still very torquey from low revs.
The biggest problem is the time taken to fit them & the fact there is no shim adjustment, just measure and order new buckets to suit.
We have not yet fitted headers but will be doing that after this weekend.
With regards to everbodys dissapointment at the power output all I can say is name me a NA car under 4 litres with more power besides Porsche, M3 & Ferrari, and all these motors need another 1000 to 1600 rpm to get that power. At 6200rpm I doubt there is a more powerfull under 4 ltr NA production motor made.
Its just that the car has no power peak, just strong power right through the range so you get real feeling of power.
I will leave you with this to ponder.
The driver of the E46 M3 came up to me after the Adelaide Clipsal race & said Gee that cars got some stick. You see I had just passed him down the back sraight.

 

While I would like more power (who wouldn't) the results were almost spot on what I guessed. I said about 150, your dad said 148 which was spot on so I for one wasn't disappointed in that regard.

I meant to ask you on the day if you could supply and fit the cams at your workshop. If you get a chance let me know so I can ponder this route until I decide I need a TT.

Good luck this weekend. Don't know if I'll have a pit pass this weekend but if you get a chance come up to the Procar box and say hello.

 

great thread,

zexc-33, that would explain the xr6t, I'm amazed that they pulled such huge power and didn't bust some trannies.

Nathan, thnx for the input. And hope you got rid of the pinging. BTW how long did it take you to install the cams?

Maybe it's time for an OZ group buy of the Borla exhaust ...

 

I have just reread my post & I ment to say you get NO real sense of power.
To those who are interested, Yes our workshop can fit the Camshafts.
It is a very big job as you have to strip off the front cover of the motor to get at the timing chains & vairiable phasers. To remove the front cover the sump must be dropped.
The biggest job is measuring the clearances with the new cams fitted then ordering & fitting the new followers with the right clearance. Get it wrong here & you have to do it all over again.
I will get dad to work out a price & post it next week.

 

Just curious how many hours it takes to complete a cam job.

And I assume while you're in there you might as well put in stronger valve springs and maybe stronger rockers (not expert on this terminology)? How much would that add?

Thanks for the info.