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Old 08-06-2009, 01:58 AM   #1
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AT Horsepower Restriction

I was wondering where the HP difference between the AT and MT comes from. Is it just a computer restriction? Sorry if this had been posted about.
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Old 08-06-2009, 02:05 AM   #2
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depends on the year, 2006 and up have the same engine as the MT different tranny and limited by the ecu. 2004-2005 completely different engine, tranny, ecu, driveshaft, UIM blah blah blah im sure you get the idea. The difference in power comes from the different engine(4port) in the AT vs 6 port in the MT and mated to an automatic tranny that will give you a greater drivetrain loss in power being delivered to the wheels. Id say its an average of 40rwhp difference...I think?
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Old 08-06-2009, 02:09 AM   #3
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I have a 2004 AT Biggest regret! I really want that extra 40hp, because I want to do more performance mods, but there's always a part of that says its not worth it because I don't have that 40whp that MT's have. So if I can get that i'd defiantly start modding it more. Someone told me its a computer restriction. Not true at all?

edit: nevermind, just re-read your post. Wow, **** that sucks for me haha
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Old 08-06-2009, 02:24 AM   #4
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go FI there is AT rx8 on here faster than most manuals i think his name is phil or sumtin
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Old 08-06-2009, 02:31 AM   #5
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the tranmsission on the auto cant take 9,000 rpm w/out damaging it so pretty much it's the ecu we can only go to 7,500 rpm instead of 9 and thats where the rotary engine really wakes up.
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Old 08-06-2009, 02:35 AM   #6
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VS8 - Yeah, I think I know what you're talking about, but that guy has also put thousands of dollars into his 8. That thing is one of a kind.

Yea, I know we can't rev as high, which is a bust. But I didn't think that was there the hp came from. Wow that sucks
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Old 08-06-2009, 02:37 AM   #7
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VS8 - Yeah, I think I know what you're talking about, but that guy has also put thousands of dollars into his 8. That thing is one of a kind.

Yea, I know we can't rev as high, which is a bust. But I didn't think that was there the hp came from. Wow that sucks
yup thats where it comes from the rotary is kinda like v-tec in civics u feel the power kick in around 4,000 rpm.
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Old 08-06-2009, 02:38 AM   #8
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If you have a six port AT and fit a turbo you should get close to what an MT can do because these motors peak at around 7500 with a turbo .

I think if someone did a decent job of turboing an AT 6 port it would be a real sweet ride and give the AT some real credibility as a sports car ....

Last edited by Brettus; 08-06-2009 at 02:42 AM.
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Old 08-06-2009, 02:42 AM   #9
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i read somewhere that some of the fastest cars w turbo are automatics.
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Old 08-06-2009, 02:43 AM   #10
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If you have a 2004 and get a new engine from Mazda after one goes. Do you think it will be a 4 or 6 port?
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Old 08-06-2009, 02:47 AM   #11
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i read somewhere that some of the fastest cars w turbo are automatics.
Yeah. I also heard all the street racing drag race guys are getting AT's now. And that there's more AT Evo X's then MT. Not sure about the Evo thing though.
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Old 08-06-2009, 02:53 AM   #12
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they will give you a rebuild of the 4 port..lol
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Old 08-06-2009, 02:56 AM   #13
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If you have a 2004 and get a new engine from Mazda after one goes. Do you think it will be a 4 or 6 port?
im pretty sure they will give you a 4 port cuz the 06 rx-8's have correct me if im wrong a 6 spd tranny and the 05 and 04 automatics have a 4 spd.
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Old 08-06-2009, 02:57 AM   #14
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we're doomed!
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Old 08-06-2009, 02:57 AM   #15
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Yeah thats true. We have a 4 speed. So doomed
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Old 08-06-2009, 02:58 AM   #16
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just trade your car in when it is paid off or get a faster car..like i am
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Old 08-06-2009, 03:00 AM   #17
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just trade your car in when it is paid off or get a faster car..like i am
lol same here im getting an 06 sti......hopefully
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Old 08-06-2009, 03:00 AM   #18
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LOL you want MT power at a budget price go with these cheap mods, K&N drop in filter $50, midpipe $150-400, COBB
Accessport w/ free MM tuning $695, ZEX nitrous (50shot)+ BHR Throttle body spacer(cleaner setup)+other nitrous goodies ~$700

so you are looking at around $1600 more or less based on preference or how good a bargain hunter you are. This should give you the power to topple most non-FI rx8's. Costs less than a Quality set of wheels and tires. Never say never with the AT
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Old 08-06-2009, 03:02 AM   #19
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lol same here im getting an 06 sti......hopefully
sounds good..i am thinking R32 or IS350
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Old 08-06-2009, 03:26 AM   #20
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Evo X or 2006+ BMW M5 for me. A few years from now. I need a midpipe, really bad. An accessport would be nice too.
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Old 08-06-2009, 01:32 PM   #21
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turbo all the way ^_^
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.....as well as a BHR g-string that I will have Flashwong model for us! It'll be worse than Chris Farley as a Chippendale.
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Old 08-06-2009, 02:54 PM   #22
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if the rx-8 came w turbo 300 hp i would keep it cuz it's the sexiest looking car out there my gf her friends and my friends both agree
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Old 08-06-2009, 03:07 PM   #23
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ZachLegend, your best bet is to sell your eight today and buy something that you can be proud of. I have a hard time understanding why someone would buy the 4 port a/t and then cry later. The four port AT is what it is and that's all your going to get and I know exactly from where I speak. My s/c 4port is faster that a stock 6port a/t or m/t, but that's it. Put a turbo or s/c on the 6port and "whoops".Whom ever is saying that there is a restriction on RPM knows not what they say. My rev range is the same as any stock or FI 6 port m/t. Know that I do have a shift limit of 8500 RPM (8 will not shift correctly above 8500 RPM) The cost of switching a 4port car to a 6port car is near the price of a new car - better to live with what you have. I truly love my little 4port and while I can wish for a way to stuff more air and fuel into it, I am not disappointed when it does not happen.
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Old 08-06-2009, 03:14 PM   #24
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how much was it to supercharge your AT ?
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Old 08-06-2009, 03:20 PM   #25
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^^^ Phil is upwards of $10,000 on his current build.
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Old 08-06-2009, 03:20 PM
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