Does the 2004 make 238 or 232 hp?
#1
Does the 2004 make 238 or 232 hp?
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?
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?
#3
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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.
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.
#5
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...
#6
#7
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.
#8
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.
#9
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
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
#10
I don't think its a myth. I think engines will seal better but eventually they start losing compression over time.
#11
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.
#15
#19
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.
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.
#21
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 ?
#24
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.
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.
Last edited by Karack; 05-14-2013 at 12:33 PM.
#25
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.
the extra RPM really seems to take a ton of power
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