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Mazda Revises RX-8 Horsepower Number
Submitted by SuperUser on Friday, August 22, 2003 - 2:23pm

We at RotaryNews have been following the threads on the RX-8 forum about the fact that the RX-8 was not making advertised horsepower on the dyno. We have also been in contact with some of the folks in Mazda about the issue. They were fully aware of the issue, and researched it fully. They have released their findings today.


As of today, August 22nd, 2003, the revised US-Spec Horsepower Rating of the RX-8 is 238 HP for the Manual 6port RENESIS, and 197 HP for the 4port Automatic RENESIS. The performance numbers advertised ARE NOT CHANGING. They have done many tests, in house, with magazines, and outside third parties, and they are still observing RX-8's that will do 0-60 in 5.9-6.0 seconds and quarter mines in 14.5 (best observed 1/4 mile run at Pomona Raceway was 14.48 at 96.1 MPH)



Because of the descrepency in the HP numbers, Mazda is sending out letters to every new registered owner of the RX-8, any pre-sale customers that haven't received their RX-8 yet, telling them of the error in the advertised rating, and giving them two options:

1. Mazda will provide free scheduled servicing for the duration of the standard warranty plus a $500 debit card.

2. Mazda will make arrangements to buy back the car.
I'd like to actually thank Mazda for bringing this out so soon (in corporate time). The first dyno reports came in at the end of July, and mid way through August, we have an answer, and solution from Mazda. They didn't try to hide things. They went out to the track, dyno, and researched the issue, and found the problem, then conducted the risk analysis, financial analysis, PR analysis in very quick time for a corporate entity. It is also important to point out these things: 1. Mazda Japan has not revised their numbers down. 2. the engineers are hard at work, and have not stopped development on the RENESIS by any means.

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subject:
answer
author:
date:
January 30, 2010 - 12:59pm
i have an automatic rx-8 with horse powr of 235hp. the car is like an airoplane. i like it alot when i use the tiptronic on the steering.it is the 2003 model.
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subject:
Who cares?
author:
No Rotor
date:
September 24, 2004 - 12:19pm
People go gaga over the S2000 and here we have a car that performs as well, has slightly more torque, a more enjoyable powerband, more luxury, and has more amature-friendly (yet competitive) handling, and can carry 4 people comfortably. It blows the S2000 away, IMHO. They aren't aiming for the same market, but this whole debate is over the powerplant and I'd take the Renesis over the F20C any day.
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subject:
No title supplied
author:
No Rotor
date:
December 31, 1969 - 4:00pm
Did they say why the #'s are down?
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subject:
No title supplied
author:
No Rotor
date:
December 31, 1969 - 4:00pm
Not really, but Emmissions are a key thing, I think.

Plus, every market has a different program. The PCM can be flashed...
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subject:
No title supplied
author:
No Rotor
date:
December 31, 1969 - 4:00pm
So they "fixed" the horsepower number with less than 10 hp change ?!?! ( 247 -> 238 )

238 hp at the crank -> 180 hp at the wheels ?!? 58 hp drivetrain loss? yeah, right .... Mazda North America are full of crap these days ....

How can a Miata with the same power output as the RX-8 have just 26 hp drivetrain loss .... ?
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subject:
No title supplied
author:
No Rotor
date:
December 31, 1969 - 4:00pm
180hp is a low dynoing engine. There have been others that post numbers better than that.

And Mazda is not full of crap... the cars are still producing numbers consistant with what the magazines say. Search through the RX-8 forum for 0-60 times, 1/4 mile times. You *will* see that folks are getting consistant numbers.

However, we at rotarynews will do a dyno test on our RX-8 project car as soon as it goes over the 2000 mile mark, to start our baseline buildup.
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subject:
Engine Dyno #s?
author:
No Rotor
date:
December 31, 1969 - 4:00pm
Will someone PLEASE post the engine dyno numbers so we can see just how much HP the exhaust system, programable ECU, and emissions systems are soaking up?

Come on Mazda, 12HP isn't much on a rotary engine. Fix the problem for the 2004.5 model year.
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subject:
No title supplied
author:
No Rotor
date:
December 31, 1969 - 4:00pm
Has these RX-8 completed their engine break-in process?
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subject:
No title supplied
author:
No Rotor
date:
December 31, 1969 - 4:00pm
From your own questions to Mazda:

"How much horse power does it make to the rear wheels?

About 204-207."

180-190 hp dynos are not even close to what they stated.

This is a joke!
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subject:
No title supplied
author:
No Rotor
date:
December 31, 1969 - 4:00pm
Please note the "About" in front... That was a number he calculated on the fly, not backed up via testing.
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subject:
No title supplied
author:
No Rotor
date:
December 31, 1969 - 4:00pm
Where you said:
The performance numbers advertised ARE NOT CHANGING.

They HAVE changed. It is nowon the Mazda USA site.
See:
http://www.mazdausa.com/MusaWeb/handleHomeFlash.action?vehicleCode=RX8&modelYear=2004

" This includes the 238 hp RENISIS engine"
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subject:
No title supplied
author:
No Rotor
date:
December 31, 1969 - 4:00pm
Performance numbers as in 0-60 (5.9s) and 1/4 mile (14.4-14.5)
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subject:
revised advertisements?
author:
No Rotor
date:
December 31, 1969 - 4:00pm
If the performance claims are still up I don't care about the drop in the advertised hp. Mazda should know better as they had to apoligise earlier about claims on the Miata. What I do care about is the fact that the car is advertised as a four passenger car and the cabin is way too small for four adults to sit in. I hope they add about five inches to get more room in car. Possibly come out with a sportwagon version. Yes I can see a 1500cc or 1700cc motor may be needed to keep up with the weight of a larger cabin The car as is should be advertised as a two + two. Product planning needs to wake up! We need an RX-3 with a simple and cheep suspension design to sell to the youth market, and an upmarket real fourdoor aimed at BMW , and make it roomy for americans, call it the RX-9. Look back at sales figures and you will see that the roomiest version of the RX-7 was the one that sold the best. Americans want larger cars than the RX-8. It is a nice looking car and I' m sure the handing is light years ahead of everthing else but you can't sit in it and be comfortable if you are six feet tall. Obsolete as it is the '86 -'92 RX-7was the best car they ever made. I like the '87 turbo two best as it has a lighter feel than the later cars and great non-power steering. The two plus two versions had more room in them than the RX-8.
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subject:
what ?!?!?!
author:
No Rotor
date:
December 31, 1969 - 4:00pm
You are on some pretty expensive drugs if you think the cabin is too small. I have seated 4 adults in my RX-8 comfortably on several occasions. It is snug and not something to sit in for long, extended trips. However, it is WAY bigger than the cabin of a 2+2 2nd gen. RX-7. Yes, I had one so don't even try to argue it. Only one full grown adult could fit in the 2+2 ---- SITTING SIDEWAYS !!!!!!

That is one of the most assinine comments I have read in a long time........
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subject:
AS much rear space as other sport sedans
author:
No Rotor
date:
December 31, 1969 - 4:00pm
Did you try to sit in the rear seats? I did 3 test drives of the RX-8, two of them with 4 adults in the car. I even sat in the back when my wife drove. the RX-8 actually has more space in the back for two adults than my IS300 (both by measurement and by experience) and about the same as a BMW 330i or A4. But the thing is it it doesn't look like has more space - which is by clever design. It is so much better than a 2+2 like my old Prelude or Integra etc...
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subject:
No title supplied
author:
No Rotor
date:
December 31, 1969 - 4:00pm
I hope this isn't the straw that breaks the rotaries back. I heard that the engine couldn't hit the 250 hp mark long before they became available to the public. Why didn't they fix this problem sooner? For those of us wishing the rx8 would be sucessfull to see another rx7 may be dissapointed. An ugly car that's power is much less than the Z.
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subject:
No title supplied
author:
No Rotor
date:
December 31, 1969 - 4:00pm
As a proud owner of a lightning yellow RX-8 6MT, I'm very happy that Mazda admitted the HP error, and getting free scheduled maint and $500 is just an added bonus to my ownership of a great car... Now if they would just admit that the climate control settings in my wife's Tribute really do suck, I'd be doubly happy ;)
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subject:
No title supplied
author:
No Rotor
date:
December 31, 1969 - 4:00pm
This week Mazda publicly stated the reason for the HP drop on the Rx-8 is because the ECU had to be modified to meet federal emission standards. This had been rumored in the past, but yesterday was the first time I saw where Mazda said so.
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subject:
Automatic
author:
No Rotor
date:
December 31, 1969 - 4:00pm
I know this may sound stupid but I was wondering what an automatic did in 0-60. I was just wondering if its faster then a V6 Mustang.
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subject:
No title supplied
author:
No Rotor
date:
December 31, 1969 - 4:00pm
Ok, this has me somewhat confused.
In New Zealand and Australia, the HP
figure in the brochure is 238hp!! (177KW)
What figure did Mazda USA initally state?

(I drive a T2 RX7 Convertible '90)
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subject:
HP change
author:
No Rotor
date:
December 31, 1969 - 4:00pm
We ordered our RX-8 in early July. We had not been following the horsepower issue. We were not told there was a difference in rated output until we were signing for the car and are now told that the manager is still working with his regional manager to get us the free schedule maintenance.
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