olddragger

iTrader: (3)

straight pipe--no mufflers at all? That would help a little.
Star Mazda engines are getting close to these dynos numbers-- without porting, but their drivetrain lost is less than ours. Maybe he has done some work on drivetrain lost too?

Now you KNOW i have always liked the idea of an EWP for the rotary engine. I havent converted because--well--I have my temps under control by my other modifications. But I still like the ewp.
What brand did he use and is it with the oem radiator? Is he using a thermostat or computer control?
Light a fire under his butt and get him to post about what he has done----!

Brettus

iTrader: (2)

No - pretty sure drivetrain is stock .

It's a Davies Craig EWP - which has a controller and no thermostat . The controller pulses at any temp below set point to avoid over cooling.
Really don't think there is much to tell apart from what I've already mentioned .

I think it may be a case of a very strong engine combined with a slightly optimistic dyno. Although ................ he showed me a dyno of a stock 8 (that was running fine) on there which only made 130kw

Brettus

iTrader: (2)

Video of dyno pull

14012013001 - YouTube

FazdaRX_8

iTrader: (1)

I would be curious to see his timing maps

thunderberk

It seems fast do you have any porting photos, what kind of streetporting doing hard or soft porting ? Need more details to get an opinion, Thanks.

PhillipM

Just switch to the S2 pump and use the larger Mazda pulley and there's no cavitation issues even at the redline then.
I had the same issues on our first S1, certainly wouldn't want to be pumping any less water than the S2 + bigger pulley setup though.
FWIW even with an underdriven water pump and an underdriven rewound alternator, it didn't see anywhere near as much gain up top as his graph is showing.

olddragger

iTrader: (3)

PhillipM -more coolant flow the better--thats for sure. But I do think the ewp has advantages on the street.

What gear was used for that dyno pull? Sounded like a 3nd gear pull? I KNOW it wasnt 5th.
Oem diff--as you said.

Brettus

iTrader: (2)

Yes .....................it was !

olddragger

iTrader: (3)

DAMN!!
I compared the dyno to the dyno vid and very roughly speaking he accelerated in 5th gear from approx 50 mph to 136 mph in 11 secs.
If everyone could get that kind of result..............

Brettus

iTrader: (2)

Doesn't count on a dyno though does it , as the ramp rate set on the dyno governs the time taken .

Brettus

iTrader: (2)

Update on the specs :

Yes it does have extractors
Rotors were lightened and balanced
Porting done by PPRE - something unusual was tried here but the guy wont say what .

Rotaman

This is the sort of results you get when you take your engine to one of the best engine builders in the country.
But don't forget it won't be cheap.
These only 2 or 3 engine builders in NZ that I would take my engine too to be rebuilt and PPRE is one of them.
Looks like the results speak for themselves.

Rotaman

olddragger

iTrader: (3)

the dyno person had the ramp rate at 12.5! Mute point but that was a fast 5th gear pull

Ok so what we can gather is a ported engine ( unk port), lighten rotors and extractors( headers for us americans). i bet he had a long tube header design?.
This is the best NA rx8 dyno I know off?

Brettus

iTrader: (2)

Looked like an off the shelf header to me - similar to anything else you might see - terminating where the cat would normally connect .

Slidin8

I would use PPRE too, however i have an Al Marsh built engine

A friend of mine had a dyno tune done at a rotary shop here in Chch, his walbro fuel pump somehow magically turned into a stock subaru fuel pump

there are quite a few shops i wouldn't go anywhere near

MagnusRacing

iTrader: (2)

Ok, had my NASA PTD RX-8 Race car dyno tested today for a "Dyno Certification".

Dyno was done at basically sea level on a Dynojet Dyno using "SAE correction factor 0.98" 70 F out and clear.

Three runs results:

Run 1 - 209 HP 136 TQ
Run 2 - 207 HP 136 TQ
Run 3 - 205 HP 136 TQ

Motor Modifications:

Pineapple Racing Built Motor with half a race season (~20 hours) and 1000 miles
Very mild porting (essentially the Racing Beat template port)
Racing Beat Reflashed ECU (Stage "3" flash for ported motor)
Ceramic Apex Seals
Mazdaspeed/AEM intake
Racing Beat Exhaust Header with runners extended 1 additional foot in length
Midpipe (no cat)
Racing Beat Dual Exhaust
Light Weight Flywheel with Tilton Clutch
Torco Oils
Stock/OEM Pullies
No Air Conditioning

Dyno graph attached.

The only thing that was a suprise to me is how lean the motor runs. The AFRs were in the 14.30 to 13.5 ratio even in the meaty part of the powerband.

Been running the Racing Beat ecu reflashes for years with no problems so I'm not worried - I've just never seen a car run this lean on the dyno.

- John

Carbon8

iTrader: (4)

Adding the madness, completely stock run.

2004 M/T w/ 24,783 miles on original motor.





Yes, I already know the numbers are very high, and have a 1% chance of being accurate. To me at least the graphs show a healthy engine.

Will post new numbers when build is done

Brettus

iTrader: (2)

That 5th gear run looks very suspect - you don't just gain power all over the rev range like that by changing gear . Otherwise the shape of the powerband looks really good and suggests a strong engine.

Ian_D

Update: did Seafoam in 2 successive fuel fill-ups and she now seems to rev and accelerate better. I'm getting another dyno run to see how much difference it's made

Stock R3 motor apart from uprated coils and Toyo catback.
MT, 30,000 miles.
Max power: 170 bhp at wheels (allegedly 204.1 at flywheel)
Chart (note that this is at wheels not at flywheel, the legends are wrong):


I'd appreciate some feedback on these figures, particularly on how this engine compares to against expected power.

Marmaduke

shazy

WOW plus no upgraded coils?
That's pretty good

shadycrew31

iTrader: (6)

Thats way to lean for WOT...

I'd get a proper tune you should be able to squeeze out 10 more whp.

Brettus

iTrader: (2)

The shape of the curve does not suggest any issues . I would say it is below average but within what we would expect for a healthy engine. I had mine on a Dyno Dynamics dyno years ago and got almost identical results . They do read lower than say a dynojet.

jerzeydevil

All,

Curious on your thoughts on this set of runs, it bothers me how it does not rise in HP much if at all after what looks like the SSV (?) opens. I tried to read through the thread, but lost on whether this may be the SSV, Coils, Fuel Pump, etc. The car is a 2004 with 120k miles on it, but only about 5k on a rebuilt engine. I rebuilt the engine last year and ported it with the RB templates. Have the following other upgrades:

- RB Intake
- BHR Midpipe w/ Cat
- RB Exhaust
- RB Header
- BHR Coils
- MM Cobb Tune

Engine runs great, pulls strong, but the dyno results about 7500 don't look great. Thoughts?

Document-Dyno Run 05-13 1.pdf

Carbon8

iTrader: (4)

That seems really low, all things considered.

shadycrew31

iTrader: (6)

That would be great on a 4 port auto...