Last post on Mar 13, 2012 at 4:42 PM
You are in the Mazda RX-8
What is this discussion about?
Mazda RX-8, Coupe
Jul 25, 2005 (6:10 am)
This popped up on the web a few days ago.
Ok grant it the car in the pictures is a little...well, altered. Mazda should try harder to get a 5 star rating all the way around, btw.
Also does anyone know if the horsepower in the auto trans RX-8 can be brought up to the same level as the manual with out destroying the transmission?
Looking soon to be an RX-8 owner.
#2717 of 3618 dtopgear
Jul 25, 2005 (7:30 am)
"Also does anyone know if the horsepower in the auto trans RX-8 can be brought up to the same level as the manual with out destroying the transmission?"
Depends on how you make horsepower.
The problem with making the tranny 'live' with the 238hp version isn't the horsepower level, it's the rpm level. Automatics and 9k rpm don't mesh real well.
If you made more hp by increasing the torque (by using a s/c perhaps) and keeping a more benign rpm, then I don't see any reason why the tranny would have a problem.
#2718 of 3618 Re: 2006 RX-8 Pix [dtopgear]
Jul 25, 2005 (7:59 am)
Many of us are waiting - for certain "developments" that have been in the internal Mazda pipeline for a few years now. These include a new manual trans. that uses "paddle shifters", and a new automatic that can take 9000 RPM. Both may be deemed too expensive by the Mazda accountants, but we shall see - they say we may see in 2006.
The difference between the "low power" and "high power" engine shows up above about 6000 RPM, and is really evident above 7000 RPM. There are extra intake ports that come into play. These, in essence, allow the torque to continue unabated to 9000 RPM. Torque times RPM equals horsepower. I'm simplifying things greatly here, but this is the essence of the difference.
The automatic transmission Mazda used was not reliable when the engine was reved above 7500 RPM, so they optimized a "renesis" design for use up to that RPM and paired it with the auto. They optimized another version for use with a manual transmission. It is reliable up to 9000 RPM (the engine is the limiting factor in this case). Because HP is torque times RPM, this is the "high power" engine. In North America we see the "high power" engine as the manual and the "low power" engine as the automatic. In other markets you can get the "low power" engine with a 5 speed manual - because it has fewer parts it is less expensive to build and the 5 speed is less expensive, so that combination gave them a lower cost car to market - still having the RX-8 "looks". The current automatic can't handle more than 7500 RPM - and I suspect it's the torque converter not the gearset that is the limiting factor.
So, the answer to your question is, without going to forced intake (supercharger or turbocharger), no, the automatic can't be brought up to the manual level. A turbo on the automatic is possible without destroying the trans. but we don't know the exact limits of the transmission, and adding a turbo to any car is not easy being that the engine is controlled by a computer (the PCM), which is not easily modified.
#2719 of 3618 Re: 2006 RX-8 Pix [pathstar1]
Jul 25, 2005 (11:29 am)
Thanks for the info guys. There are some turbos out there. Not sure if they are geared towards an automatic. Think that a Supercharger would be excellent but spinning one past 7500 rpm sounds a little crazy to me. Think the best solution would be a low pressure turbo to boost the low end torque. The PMC is another issue alltogether though.
Anyway I'm waiting for the 2006 specs to come out. A "paddle shifter" that works would be worth the wait. And does anyone have know of performance figures for the Auto vs the Manual? Does the extra torque of the auto make up for the horsepower loss? Is gas milage any better or worse?
#2720 of 3618 Re: 2006 RX-8 Pix [dtopgear]
Jul 26, 2005 (6:52 am)
Unless you are stuck with a bumper to bumper crawl of a commute you should do yourself a favor and learn how to drive stick. Makes driving (any car) just that much more enjoyable.
#2721 of 3618 Re: 2006 RX-8 Pix [dwynne]
Jul 26, 2005 (10:55 am)
I know how to drive a stick. Have been driving them since I was 13. I live in Miami. all it is bumper to bumper like 80% of the time. Also my wife is more interested in an auto so although while I prefer a manual gear box, I have to consider an Auto. And frankly I've been in several cars that suck with and manual. Mostly GM products.
#2722 of 3618 Re: 2006 RX-8 Pix [dtopgear]
Jul 26, 2005 (11:08 am)
Hopefully Mazda will fix the 8 for the slushbox set, since in its current build (4 speeds, less power) I would not recommend it.
I would not recommend getting an underpowered car with the intention of trying to boost it to acceptable levels of power. I would think that is a road to disappointment.
If you are crawling in FL traffic all the time - the 8 runs pretty hot (see the new recall for melting gas tanks) and has a pretty weak A/C. Couple that with you not wanting the manual tranny and you might want to look at something else?
Or do like I do - get your wife her own (auto) car and then you can get what you want!
#2723 of 3618 Winter tires vs All-season tires.
Jul 26, 2005 (11:46 am)
I have read and re-read the excellent advice given by pathstar and countless others on the types of winter tires---I appreciate everyone's input.
My last question on this subject is... Would four "all season tires" work as a replacement for the current summer sport tires on the existing wheels?-- Will that get me through a winter in Chicago, or should I spend the money on the winter tires and wheels.? I have a short two year lease--and I did not realize I would be paying another $1200-$1400 on tires and possibly wheels too. I hate to sound cheap-but I'd like to save a few bucks.
-- Other than this minor hassle--the car is amazing!
I know Pathstar bought the 17 inch wheels to gain better clearance as snow builds up in the wheel well / and I know a majority of people have opted for the Blizzaks LM 22's. Your response to all-season tires would be appreciated--
#2724 of 3618 dtopgear...it is sure blasphemy....
Jul 26, 2005 (11:54 am)
(punishable by death) to compare this amazing car to anything GM can crank out. I came from a die-hard "buy American" family and I adhered to that until a few years ago. The car that changed my life was a 2001 Pontiac Grand Am, 5 speed. I would have gladly given the car away and continued to make the payment just to never have to see it again. The first dealer that quoted me anywhere near pay-off got the sale. To say I hated it is an understatement.
The RX8 is a great car, but I wouldn't even consider the auto (and I'm a female).
#2725 of 3618 Just picked up my mail and Mazda....
Jul 26, 2005 (12:02 pm)
sent me a nice letter talking about how important MAZDA service is for the rx8 and it had a business card-type thing you could pull off. It has my dealer address, phone number, my service manager's name, the service dept hours and my car's VIN to put in your wallet. Also, I got a free bottle of touch-up paint and it's even the right color for my car. Boy, it's really yellow in that little bottle.
On the flipside to car customer service, just sent in a nasty survey for warranty work on the BF's 2004 Chevy Duramax. That ignorant thing goes to the shop every couple of weeks for some irritating little "thing" or something else. He saw my nice little Mazda package today and said "Damn, I spent twice the amount you did on a vehicle and all I get are recall notices, leaks, rattles and paint peeling off plastic."