Hymee

iTrader: (1)

The cat in the RX-8 is quite large, and we doubt it causes much, if any, restriction. But no, if you look at the vid, there isn't a cat.

One thing we might be able to do when we go back with the FI mods, is do a pull with our high-flow cat fitted (as per Wildcards car - pics posted earlier in the s/c thread).

Cheers,
Hymee.

Richard Paul

iTrader: (5)

Nice job Hymster. Like that guy on Laugh In says "veeeeerrryy interesting".

Hymee

iTrader: (1)

Thanks mate!

Dan 8

Congrats Hymee a man of your words...

https://www.rx8club.com/showthread.p...6&page=1&pp=15

So were do you go from here is 100 hp ++++ gains available

Hymee

iTrader: (1)

Well, time and more testing is the only reliable way that I know will say if I get to that "goal".

Stay tuned. More dyno time might be available next week.

Cheers,
Hymee.

peloponisios

So let me get this straight in my head. What we see here is a dyno like the one Mazda did to publish the power to the consumers, or am I wrong?

Some questions: -This is the most hp tha you can measure, being that there are no restrictions here, wheel loss, ECU, etc., so this is the most we can take from the engine?

- So when someone tunes, the most he can get is the hinted number? Or in that area nevertheless?

Nice work for rx community, thanks.

takahashi

Chassis dyno is the best dyno. kW at the flywheel. You are true tuner Hymee. Very nice - I am sure you had fun. Keep on the good work.

NO SPECULATION EVERYONE. Japanese have chassis dyno a range of Renesis.

DEPENDS ON YOUR LUCK: It can range from 180ps to 220ps. Yes please stop crying

That is why some people dyno their car at the wheel with mods less kW than someone stock

Hymee

iTrader: (1)

Taka-san, this is an engine dyno. A chassis dyno is what you use to measure the power available at the wheels. I.e. you drive the chassis on to the dyno.

BTW - I don't deserve all the credit. Grandad deserves a fair whack of it as well.

Cheers,
Hymee.

Hymee

iTrader: (1)

What you are thinking is pretty much spot on. The manufacturer "may" use a different standard, but I am assured the correction factors used in this setup are within 1 HP of SAE corrections. Perhaps the manufacturers tests were without the generator or any other ancillaries, but without being 100% of the "standard", I'm pretty sure that the advertised figures are supposed to be as "production" as possible.

Yes - this is the most we can get out of this engine in the "standard form". It is the HP measured at the flywheel, using a standard, unopened motor, the standard throttle body, standard intake runners, standard exhaust manifold, then tuned to make the maximum power from the fuel we used (95 RON as recommended).

But I must stress the point of this excercise is not to discredit Mazda, but rather establish a base for continued testing. Next time we go back to the dyno with FI, we can see exactly how much horsepower different things have achieved. It is about as scientific as we can be, without having the big budget of a big car maker.

Cheers,
Hymee.

PS - I'm surprised a little bit that no one to date has made any comments about the oil cooler...

california style

I cant believe that thing about the oil cooler!

What were you thinking, its crazy!

(is that ok?)

takahashi

AHhhhhhhh..... Oops.. I was wrong again - sorry Hymee. But I like the sound of "chassis dynonometer" (in English accent)... I was watching fifth gear and top gear all week .

What oil cooler The yellow can?

takahashi

I was thinking when I watch the video - Why is only the middle tube is red hot on the extractor but not the other 2? Camera angle?

Also how come the shape of the extractor is different from the other that I saw.... wat do you know about extractor Taka...

r0tor

iTrader: (1)

so what was the a/f ratio and ignition timing for this tune?

supergoat

All that work only to not publish the exact numbers. What a waste of our time.

rotary crazy

222 hp

Nemesis8

iTrader: (3)

These engines are all hand built - does that play into the variances of the power produced ever so slightly? I doubt it, but it is the only thing that is not repeatable to the same exact standard during production. I wonder what the compression is on your test engine as compared to mine?

Magic8

It's hand assembled but the components are mass produced. To my knowledge noone is hand filing or polishing the components for fit, unlike a Ferrari or a Rolls-Royce.

Without knowing what Mazda has for tolerances on components, it is hard to know what kind of effect the tolerance stackup have on the engine output.

eclps0

I say 212-218 hp

Using 6% and 6.3%

Nemesis8

iTrader: (3)

Yes, I understand that - I work in a manufacturing plant that builds severe duty chopper pumps. Our tolerances are critical in achieving the correct clearances to maintain our ability to chop and hold pressure in the pump. So the key is Mazda's tolerances...

Mark - I want those port extractors

olddragger

iTrader: (3)

Will that header fit under the car ok? Looks like it will be really close. How do you handle the siamese port?
Olddragger

Asmoran

X * 6.3% = 14
X = 14/.063
X= 222.22222hp

Rasputin

For the European Power and Torque Homologation test, the engine is run in conditions very close to the installation in the vehicle, including complete intake system (with air-box, and zip tube), complete vehicle exhaust, complete FEAD (Front End Accessory Drive), auto calibration (no tuning of any kind), nominal compression ratio, program fuel (95 RON in EU). It is a witnessed test : someone from a EU certified agency come and check the test is run according to the EU procedure. Engine manufacturers have little advantage to cheat as the EU has the authority to come and check peak power and torque from engines picked-up at the engine plant against homologated figures. These engines must come within 4% of the homologated figures (peak power, peak torque, and engine speeds at which they appear).
In these condition, the high power Renesis is officially homologated at 170 kW (231 hp).
Hope it helps.

I'm very impatient to see what kind of figures you'll get though, Hymee. I trust they will come close to the homologated numbers.
EDIT : I just realised you decided not to publish the numbers. Probably a wise decision.

Cheers,

Fabrice

Renesis_8

222hp is exactly 4% less than 231hp....

but 222hp wasnt achieved using stock tune anyways
________
KIDS PAXIL

dmp

And 7% less than the then-rated power of 238. And yes; power would have likely been lower w/ stock ECU.

Keeps coming back to RB's Renesis dyno fo 216fwhp awhile ago.

Hymee

iTrader: (1)

Close, but no banana. Anyways, the banana has already been handed out I think.

Cheers,
Hymee.