I'm not sure if this is the first reported on this forum, but I now have a baseline dyno run for an aussie RX-8.

http://users.tpg.com.au/adslnt5c/marko/images/RX8Dyno1.jpg

122rwkW (rear wheel kW). Using an old rule of thumb, (fwkW is about the same as rwHP) that equates to about 163 kW at the flywheel.

To give some comparative info on that particular dyno:
- A stock 300kW HSV GTS will pull 220 rwkW
- A "stock internal" LS1 with good exhaust/tune/intake will pull 235 rwkW

The mixture (bottom graph) is very rich, except at the upper end, and you can clearly see where the mixture gets closer to ideal (AFR~12.5), she starts making better power.

So that can be the baseline for the "Hymee Exhaust Kit", and the "Hymee Tune". There is some tidbits of things to come :)

BTW - PowerTorque is a very experienced tuner and builder of competition engines, including V8 supercar teams, plus he is a past top 10 finisher at Bathurst, and in times past a professional driver (finished 2nd to Skaife in the Formula Holden series)

I can see all the inevitable dyno wars starting now...

Cheers,
Hymee

HYMEE

Welcome back to the land of OZ , i would like to chat with you on a landline is that possible ??, interesting breakthrough by Microtech tuners.
michael

Hymee,

122 rwKW you say? So = 163.6 rwHP?

Did you do only one run? and what were the temperatures?

OverLOAD

Originally posted by OverLOAD
Hymee,

122 rwKW you say? So = 163.6 rwHP?

Did you do only one run? and what were the temperatures?

OverLOAD

Yep. 122 kW at the wheels, or 163.6 HP at the wheels.

We only did 2 runs, and this was the better. The figures are adjusted to SAE J306 using the correction of 4.36 for whatever the temp/humidity/pressure was at the time. Probly in the hi 20 degrees C if I were to guess. The correction factor on the dyno is controlled via a weather station in the shop.

Cheers,
Hymee.

Originally posted by Lock & Load
HYMEE

Welcome back to the land of OZ , i would like to chat with you on a landline is that possible ??, interesting breakthrough by Microtech tuners.
michael

Is this something that'll work on red cars too? I'll even suck up of the yellow debate if I have to :D

Originally posted by Kev
Is this something that'll work on red cars too? I'll even suck up of the yellow debate if I have to :D


KEV

Thunderbird fan ,hmmm with a red rx8 , bvd s wife and mine will definetely have to give you a counselling session .
The information is on a need to know basis, and yes i will share it with a priviliged few ,may even consider sharing with a red rx8 owner .

Thanks for your intendeed help with babel fish but i still cant get jack shit , i only need a large banner or reamemiya.

michael

Originally posted by Lock & Load
HYMEE
interesting breakthrough by Microtech tuners.
michael

More info please. I'll be using Microtech for my conversion.

kas

As soon as i get more confirmed info from microtech i will let you know.

Originally posted by Lock & Load
KEV

Thanks for your intendeed help with babel fish but i still cant get jack shit , i only need a large banner or reamemiya.

michael

F.A.B. L&L,

What's the banner's purpose? Are you after a windscreen banner or the like or are you after a hi-res image you can manipulate?

even rumours stir ideas.

thanks

I had a 196.5 whp and 139. torque on my Rx8. It took me 3 dyno runs to pull the hp out the car.

Hats off Hymee for doing the first Aussie dyno run that we know about. 122 rwKw sounds low. :(

I read here somewhere that drive-train losses for the RX-8 were in the order of 17-25%, which would mean that 177fwKw should pull somewhere in the order of 133-147 rwKw. I don't think we will ever see true Dyno figures for the '8 though, but at least Hymee you now have a baseline from which to compare any future mods.

Kas, L&L - interested to hear what comes of your Microtech investigations. BTW Kas, when is my Turbo kit going to be ready? :D :D

KEV

YES its for a windscreen banner .

Anybody noticed that the A/F ratio remains almost constant at 12? It's not like the crazy fuel maps we get in the US!

Originally posted by neit_jnf
Anybody noticed that the A/F ratio remains almost constant at 12? It's not like the crazy fuel maps we get in the US!
Correct, but still too rich.
WOT should be getting around 13.3 to 13.5 at 7000rpm+

In N. America we are getting around 10:1 at that range.

Hymee,
I you're interested, we could do a back-to-back comparason of a completely stock 94 RX-7 and an OZ-spec rx-8 because in theory they should put out identical power. I need to do a baseline anyway.

-pete

Originally posted by canzoomer
Correct, but still too rich.
WOT should be getting around 13.3 to 13.5 at 7000rpm+

In N. America we are getting around 10:1 at that range.

10:1 - you poor bastards! Actually - should I say you pig-rich unlucky souls!

Like I said in another post, I didn't feel a great difference via my coightometer in a US spec car and my own. But the coightometer is a fickle instrument, and does not produce a quantifiable figure. All I can say is I have not yet exceeded the RX-8 pucker factor, therefore the twitch valve has not opened yet :p

Can I ask a question from a rotary newbie... Why do you say desireable AFR's of 13.3 - 13.5, when in the LS1's we aimed for a steady 12.5 across the rev range at WOT? It is to say the rotary can run a lot leaner than a reciprocating engine? (I do remember that stoichometric is 14.7, and a little richer for max power is desirable)

Cheers,
Hymee.

The other option is I completly forget the correct ideal AFR figure :) D'oh. So I am open to be corrected!

Cheers,
Hymee.

Originally posted by rpm_pwr
Hymee,
I you're interested, we could do a back-to-back comparason of a completely stock 94 RX-7 and an OZ-spec rx-8 because in theory they should put out identical power. I need to do a baseline anyway.

-pete

I'm keen. Do you wan't to go to PT one time?

Yep. Are they open saturdays? We might be able to get a few people interested.

-pete

Yep - Who would be interested in having a RX-8 / Rotary Dyno Day at PowerTorque? (As long as it is not a RICE dyno day!)

I can organise - just let me know who is interested.

Last time we did one it was $25 per car. And a BBQ was put on as well :)

PS - If any of my LS1 mates are there, they will give us shit :) I am starting to get used to it though... We used the little orange valve removal tool from my RX-8 puncture repair kit, to help remedy a fuel rail problem in an 11 second SS ute! :p

Cheers,
Hymee.

OK had a quick chat to some people. Hostile, and my brother are both in. So you can put down a stock standard 20B cosmo and E36 BMW M3.

How about saturday the 29th?

BTW: As for the LS1 guys, we could always have a prize for the heaviest car there, or maybe "most oil used"? ;) j/k!

-pete

OK - I'll put up another thread for it, so as not to let this one go off topic...

Originally posted by Hymee
10:1 - you poor bastards! Actually - should I say you pig-rich unlucky souls!


We had better be rich. At 14l/100km and 91 octane at $.70 Canadian a litre, it is costing a lot of gas money..


Can I ask a question from a rotary newbie... Why do you say desireable AFR's of 13.3 - 13.5, when in the LS1's we aimed for a steady 12.5 across the rev range at WOT? It is to say the rotary can run a lot leaner than a reciprocating engine? (I do remember that stoichometric is 14.7, and a little richer for max power is desirable)

We got good power at that range, and reasonable exhaust temps.
For part throttle normal running we set to 14.6 levels.


Cheers,
Hymee.

The other option is I completly forget the correct ideal AFR figure :) D'oh. So I am open to be corrected!

Ideals are good, but testing is better!


Cheers,
Hymee.

Originally posted by canzoomer
Ideals are good, but testing is better!

Amen to that!

were the mixtures measured before or after the cat?

Before!

I would say "of course" but i don't want to sound snotty.

Lamda sensor is inserted right after header, about 3" before the cat inlet.
We also put a pyrometer sensor there, to measure exhasut temperatures entering the cat.

Sorry, that was directed at Hymee. I figured you would have done it before the cat, but since Hymee is doing a one-off dyno run, it's common practice (In OZ at least) to shove a sensor in the tailpipe and "correct" the readings later.

-pete

"Mine" was measured with a wideband O2 sensor stuck up the exhaust pipe as per "usual" chassis dynoing. We had not hooked into the ODBII port to read the ECU's inputs.

Cheers,
Hymee

See canzoomer? :) So his readings aren't really comparable with yours. His would be ?leaner? than true.

-pete

Indeed. Depending on what kind fo job the cat does in scrubbing.

Also, some fuel probably gets burned up as well.

29th? do I feel another drive to Qld comming on?

Shit, at this rate I'm going to have to move ther..

++dez;