MariesRX8

My old '04 brochure says my car makes 238 hp. I just noticed the '09 brochure says 232 hp.

Did the later engines actually lose 6 hp, or did Mazda just adjust (again) it's rating system and all the years make a claimed 232 now?

I realize there are arguments about how much power the engine "really" makes, I'm just curious if the '04 actually made a little more power than later engines?

mscamp02

iTrader: (3)

alneilsen answer is a little more accurate

EDIT:

alnielsen

iTrader: (4)

The answer is both. It depends on the way horsepower is measured. Mazda settled on the 238 hp figure for North America spec cars in 2004. A couple of years later the US government changed the standards for the way official horsepower is figured and this changed the figure to 232.
Update: mscamp02 is right, it started at 250 hp. There was a class action lawsuit, in the US, after it was found that that number couldn't be true. It wasn't and that is where the 238 number came from. The 250 figure is correct for J spec cars.

Strata-R

I thought Mazda changed the ECU settings so the newer versions were a bit more fuel efficient.

kiker14

I was under the impression that as time goes on, the rotary engine can actually create more compression after it wears in properly (sealing the gaps better) and therefore increase hp... I guess that could be a myth...

MariesRX8

Right, or well I wondered if the Series 2 engine changes lost 6 hp over Series 1?

blazenblue63

I've heard similar. It's said that the Mazda rotary race cars at le mans made more power later in the race because of the engine getting more worn in.

New Yorker

In an early long-term road test Car and Driver noted their 8 got faster, and said something about how the "myth" proved to be true, at least with their test car.

jrx13

If I remember right, it was Mazda didn't test the hp with the US catalytic converters and the PCM fuel map changes to make sure the cats could supposedly last the Federal and California emissions warranty. (of course most didn't anyway!), same for the 2001 NB Miata hp issue.

But here's an old new story about it and I remember Mazda buying back a couple.

http://www.usatoday.com/money/autos/...rbuyback_x.htm

Supernaut6

I don't think its a myth. I think engines will seal better but eventually they start losing compression over time.

sinned2545

I remember speaking to Dave (KDR) about blown Rx8 engines....
And how can you tell its going to go....

He said it will feel a hell of alot faster.... LOL...
When I asked why, He's was saying something about the reduction of friction... and everything spinning more freely.

Polak Graphics

I heard that from Dave also. I guess you would have hit that sweet spot of lower compression or else the flooding, tuning problems, etc.

Strata-R

i wonder if anyone actually tested this? you know by testing a new RX-8 on a rolling road, and doing the same at say 35,000 miles.

9krpmrx8

iTrader: (46)

An engine always feels strongest right before it blows.

comebackqid

iTrader: (13)

I heard this when I awhile ago I'm thinking its true, a friend of mine was describing how fast his mitsubishi eclipse was smashing before the engine popped.

9krpmrx8

iTrader: (46)

Yeah it really applies to all engines. I have been there, done that,

monchie

Its the boost that makes it die...lol

04RX8man

Regardless not enough!!! Haha

iSki123

This is a VERY funny yet TRUE statement. My 2004 RX-8 4 PORT felt like it was pulling freaking hard before the engine went. I was literally burning rubber in 2nd gear. Remember, I'm talking about the less powerful 4 Speed RX-8.

04RX8man

Yep it always feels great right before it lets go. Mine did too.

ronnydingding

i have seen many posts concerning bad compression in cars that appear to start run and drive fine and have just read a post saying that rotary engines make more power when properly run in .what ?

ShellDude

iTrader: (12)

well based on this data I hope my 8 runs like crap for many more years to come

R80MAV

My 8 is definitely running worse than it did a year ago... looks like im in luck

Karack

an engine may run it's best just before it blew due to a fuelling issue, leaning out the mixture which was the cause of failure. this myth i have proven on the dyno with engines that blew without running lean and produced no more power than usual up until the point i let off the throttle. i would walk away from anyone who sais these engines produce more power due to less friction before they blow.

8's have adaptive memory, so if your 8 is getting quicker over time it is likely because it is adapting to your driving habits and compensating for them. don't kid yourselves.

the lemans rotaries used ceramic seals which do take a long time to seal at their maximum, the engines we see have cast iron metallic seals. apples to oranges.

and last but not least, the figures rated are still inflated even if it is rated at the crank. compensating for drivetrain losses you won't find a wheel driven dyno that jives with the figures mazda put out, which would mean the 8 has roughly 200 wheel horsepower, which isn't true, that or the transmission and differential are power hogs.

j9fd3s

i think this is more likely, i was talking to the local shop teacher who has raced rotaries since the 70's and he said basically the same thing. even NA you tune to max power, and then go a little richer...


there was a guy who posted an engine dyno vs chassis dyno of a P port engine. the engine did 320hp at the crank but only like 240 at the wheels, using a turbo drive train.

the extra RPM really seems to take a ton of power