Z350Lover

iTrader: (2)

Okay guys... finally got back to home from the late meeting... and here is the power curve from APS dyno result on my car....




and for the reference/comparison to david's car, here is david's power curve...



cheers,

richie

Z350Lover

iTrader: (2)

From those 2 graphs, the only thing I am interested in is not the final figure that unichip helps to achieve... but BEFORE Unichip was installed... look at the Power curve and the Torque Curve.... what I have more than David's car are JUN flywheel and the High-flow cats (run for 50km before dyno), and you can see the torque has been achieved slightly higher than just with an exhaust on...

So I guess there is where you can compare how much the mods could help on the car before the chip... and it is also interesting to see the amount gain from the chip for both cars are quite different though which ends up to achieve very similar end results....

cheers,

richie

mchapman

iTrader: (1)

Actually, I am not aware of that anyone got 140rwkw from the APS dyno though.... I might have missed it, but if that's from different dyno machine, I don't think it can be counted in this case though.

It was another dyno, but ZZZ-35-David dyno'd ~140rwkw at the other dyno, then had a HiTech installed and dyno'd at APS for ~150rwkw then got unichip installed and it went to ~160rwkw at APS. So the 140kw must be near the real figure for his car, and that only assumes the HiTech gave him 10rwkw gain.

Seems you've gotten respectable gains everywhere on the chart.

KY350

Well I looked at people's past HT / Amuse dyno graphs and it appears that the exhaust does not yield significant increases in torque anywhere in the rev range. I calculated a max of 5% increase in torque at best and usually only 2-3% increase at max torque at 4800rpm. The torque gains may be minimal but the power gains on the other had are significantly improved at the top end, according to the dyno charts.

However, the Unichip seems to yield up to a max of about 13% more torque from the Z+exhuast dyno and about 10% more at 4800rpm (David's dyno).

So by my calculations, the Z with exhaust and Unichip should be producing about a maximum of 410Nm at 4800rpm (363Nm x 1.03 x 1.10). That's a nice 47Nm or 13% increase over stock.

That number is impressive in itself, but looking at the above dyno, the most impressive feature is the increase in torque throughout the rev range - great job APS.

DavidM

So by my calculations, the Z with exhaust and Unichip should be producing about a maximum of 410Nm at 4800rpm (363Nm x 1.03 x 1.10). That's a nice 47Nm or 13% increase over stock.

This has nothing to do with any mods or anything like that, but 410Nm from an NA 3.5L engine would put it at 117Nm/liter ... which seems a bit far fethed IMHO.

Most cars have a hard time producing 100Nm/liter, and the 350Z beats it out of factory (ie. 103.5Nm/liter). Anything over 100Nm/L is very impressive ... even an S2000 manages 'only' 104Nm/liter. Though, the the best engine in these terms is the e46 M3 engine which produces 114Nm/liter.

So in order for the 350Z engine to produce 117Nm/liter, it would need to be the most 'efficient' engine in the word (ie. in that tune) and of all engines, surpass what the the M3 does.

ps. Increaseing the Nm/liter for an engine is very hard, as that is directly related to capacity and efficiency. On the other hand, kW/liter are not only given by the capacity and efficiency, but also by keeping the torque 'flat' at high revs. ie. look at the engine in an F1 car. It's an NA 3.5L engine that produces around 600kW, but has 'only' about 360Nm. They get the power via revs, while the torque figure is largely dictated by the displacement.

frosty

For a dummy - which graph's which?

FRIZZLE

KY350

Top graph is Z350Lover and bottom one is DavidC's.

DavidM

Interesting observation about the 2 Unichip graphs. DavidC has gained good 20kW between 5000 and 6000rpm, and good 10 - 15kw between 4000 and 5000rpm. On the other hand, Richie gained 4 - 7kW between 4000 and 6500rpm, and less everywhere else.

So just from that, I would guess that the chip made a pretty major difference in feel on DavidC's car, while it'd be a lot more subtle change on Richie's. Though, I'm just going here by the 2 graphs and nothing else.

Z350Lover

iTrader: (2)

DavidM,

You are correct there.... that is the place confuses me as well... hahaha.. really don't get why that will be the result though... is it because of the cats that's playing the tricks on the Air/Fuel ratio? that makes me thinking this might be the best engine power that the N/A zed can give (with exhaust & intake).... It will be interesting to see how other zeds turn out in the near future!

Last word... Unichip is great!!!!! Love it!

cheers,

richie

THX723

iTrader: (3)

Nice gains guys!

Hey Peter (APS),
Just curious ... how much timing advance did you dial in (for the plot you posted)? and what was your target AF there (at WOT)?

Thanks,

ELL.21

Slighty off the topic here, but when you dyno your Z your supposed to do it in 5th, Unfortunantly i got mine dyno'd on the weekend in 4th, will that give me a higher than normal reading or slighty lower then what im reallt running?

214.9rwhp = 161rwkw in forth
HiTech Cat back and K&N pod filter

Im interested in grabbing one of the Unichips, but i just wanna find out what im running to begin with.

Oh and i won the dyno comp for the NA 6 cyl class too

DavidM

Unfortunantly i got mine dyno'd on the weekend in 4th, will that give me a higher than normal reading or slighty lower then what im reallt running?

It should not make that much oif a difference what gear you run it in as the dyno should be able to compensate for the different gearing. There shold be less than 10kW variance between a run in 4th and 5th gear. Though, if the gearing did make a difference tothe dyno reading, then there should be higher reading in 4th than in 5th as there's more power at the wheels in the lower gears.

Though, common practice is to run the car in the gear that is the closest to 1:1 ration (ie. 5th gear in the 350Z).

ps. What dyno were you using? (as each dyno produces different results ... well, even the same make dynos in 2 different places will produce different results).