2010/2011 RX-7 Motortrend article
#151
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sound like a plan
back on topic, do you think the 2.0l is a 3 rotor? The rumor i heard is that it is a 2 rotor, but I also heard about a year ago that mazda was getting ready to make 20b 3 rotor engines as a limited production engine for race teams and as a crate motor
back on topic, do you think the 2.0l is a 3 rotor? The rumor i heard is that it is a 2 rotor, but I also heard about a year ago that mazda was getting ready to make 20b 3 rotor engines as a limited production engine for race teams and as a crate motor
#152
sound like a plan
back on topic, do you think the 2.0l is a 3 rotor? The rumor i heard is that it is a 2 rotor, but I also heard about a year ago that mazda was getting ready to make 20b 3 rotor engines as a limited production engine for race teams and as a crate motor
back on topic, do you think the 2.0l is a 3 rotor? The rumor i heard is that it is a 2 rotor, but I also heard about a year ago that mazda was getting ready to make 20b 3 rotor engines as a limited production engine for race teams and as a crate motor
someone would have to look it up for an exact number, but i seem to recall somewhere around 20k as the price tag.
#153
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nope, as I understant it they where making escentric shaft , but they stop making them, you could buy a remanufacture engine but that is another thing. Also production of the center housing has being stop.
#154
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whatever the story is, I just hope Mazda sticks to the badge and brings out a massively attractive rotary. The all-new GT-R and EVO seem to yield no place for a friendly rotary like the renesis. They need to go turbo-wild again.
Just my 2 cents
Just my 2 cents
#157
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#161
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![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
#162
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hey ive seen that- somewhere.....
oh yeah carlos lopez was showing us a housing tapped in the right place and explaining some of the pros/cons ,tuning issues etc. thats a good man right there. wife is a very nice lady as well. i was very happy to meet them last year.
#163
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Im some what disapointed, the though of a 2.0l rotary engine made my mouth water, but I allways thought the 1.3l and 1.5l to be more realistic
1.3l=Kabura type vehicle
1.5l=rx-8 second gen
#164
Paul.
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#167
Go Texas Longhorns!
there is more than one way to do direct injection. You could fire the fuel from the top down, near the trailing plug, this has been done before on certain rotary race cars.
What is harder but should yield better economy results, is firing the fuel right between the plugs when the conpression is the greatest, hence the need for high pressure fuel injectors. I would guess Mazda will go this route, since they have teh R&D and the PCM ability to control that with the precision necessary.
You can get around the high pressure injector issue by using a subchamber setup, but I don't know how much better/worse economy is vs. the menthod mentioned above.
the issues raised with DI 12 years ago when it was tried using the sub chamber method were emissions related, not performance, or even really cost. lean burns raise NOx, which until recently, was hard to scrub out with cats.
What is harder but should yield better economy results, is firing the fuel right between the plugs when the conpression is the greatest, hence the need for high pressure fuel injectors. I would guess Mazda will go this route, since they have teh R&D and the PCM ability to control that with the precision necessary.
You can get around the high pressure injector issue by using a subchamber setup, but I don't know how much better/worse economy is vs. the menthod mentioned above.
the issues raised with DI 12 years ago when it was tried using the sub chamber method were emissions related, not performance, or even really cost. lean burns raise NOx, which until recently, was hard to scrub out with cats.
#168
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how about something like this? instead of 2 aux ports 4? and the exhaust ports in the center housing be about the same size as the ones on the side housins
Last edited by rotary crazy; 07-20-2007 at 12:51 PM.
#169
I've seen nothing that said the final drive was different. but you can go play around with that calculator all you want. changing the final drive size doesn't change the E.T. or the trap speed just the RPM at which those are achieved.
And that is deff. a bhp not whp rated calculator.
And that is deff. a bhp not whp rated calculator.
![](https://www.rx8club.com/attachments/rx-8-media-news-11/104545d1185159826-2010-2011-rx-7-motortrend-article-untitled.jpg)
If it was BHP ratings, how would it possibly know the whp? Drive train loss is different on all cars. Auto vs manual, different trannys and differentials will make for different ammounts of drivetrain loss as well.
Also, different JDM FDs had different rear diffs. I believe Type RZ and Spirit R FDs had shorter 5th gears and shorter diffs.
#171
maybe a bit more accurate. how did you get the 27" tire height though? 16" rims with 225/50/R16s on them shouldn't be anywhere near 27" high...
Even still, RX-8s don't run 14.09, they run closer to 14.5 and FDs don't run 13.24s, they run closer to 13.5s.
You've still got way too much power. It's a whp calc and if you need me to, I can ask the guy who owns RP.
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
Alright, also where did 220hp come from for the 8? I thought they had 232?
#172
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Nah, I meant Cayman. Look, don't get me wrong, the Cayman would be my choice for a litany of reasons, but for outright speed, the Z is not that much slower, or that much worse of a handler. It's a matter of diminishing returns the more you spend. So if not 90%, than call it 80%. My point is, arguably, for twice the price of a Z the Cayman doesn't offer twice the outright performance. Better package, more refined, almost perfect handling as far as I've read and higher quality all around...surely, but not twice tthe performance. All I meant by it...
#173
Rotary , eh?
iTrader: (1)
How are you going to make a 1/4 mile pass with no fuel and no driver?
go look up the actual tire height of a 255/55/16" tire. its 27. where did you come up with 19.xx is a better question??
You are telling me that the calculator is low by ~1/4 second on the FD when BHP is put in yet its supposed to be using wheel HP?
go to the calculator and use WHP(~220) and tell me what kind of E.T. it gives you.
If you put in ~190-200 - what the RX8 generally shows in WHP on a dyno - you get a number that is way to slow. I also used several other cars that I am very familiar with as test beds and they all worked out as this being a BHP calculator.
There is always debate on the specifics of the number and the calculator seems to be geared for a bit more drivetrain loss than the RX8 has shown to have so i used a conservative number.
You also have to take into account that this is a calculator. its not magic. it doesn't say what the E.T WILL be. It says what you could run with great traction etc etc. On a real life run you have a bit of inconsistency with driver, tires, etc, etc. using your numbers to be within a 1/4 second is pretty good in my eyes.
go to the calculator and use WHP(~220) and tell me what kind of E.T. it gives you.
You also have to take into account that this is a calculator. its not magic. it doesn't say what the E.T WILL be. It says what you could run with great traction etc etc. On a real life run you have a bit of inconsistency with driver, tires, etc, etc. using your numbers to be within a 1/4 second is pretty good in my eyes.
#174
I'm sorry, 2780 is curb weight with full fluids and all. I forgot the driver, let's say the driver weighs 200lbs.
It shows a 13.65, right around where a stock FD would run with modern tires.
![](https://www.rx8club.com/attachments/rx-8-media-news-11/104574d1185220624-2010-2011-rx-7-motortrend-article-untitled.jpg)
BINGO we have a winner. So why was it brought up in the first place?
![](https://www.rx8club.com/attachments/rx-8-media-news-11/104574d1185220624-2010-2011-rx-7-motortrend-article-untitled.jpg)
You also have to take into account that this is a calculator. its not magic. it doesn't say what the E.T WILL be. It says what you could run with great traction etc etc. On a real life run you have a bit of inconsistency with driver, tires, etc, etc. using your numbers to be within a 1/4 second is pretty good in my eyes.