JDM RX8 redlines at 9500 rpm
12-12-2005, 12:52 AM
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JDM RX8 redlines at 9500 rpm
I was just surfing Wikipedia, and it claims the JDM RX8 redlines at 9500 rpm vs the US version at 9000 rpm.
The engine redlines at 9000 rpm for the United States export version, and at 9500 rpm for the domestic Japanese model. - http://en.wikipedia.org/wiki/RX-8
Last edited by Slick8; 12-12-2005 at 01:01 AM.
12-12-2005, 01:37 AM
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Book learnin'......
Since when does Wikipedia know anything???? 
They are probably confused between "redline" (the mark on the gauge) and "max revs" (ignition cutoff). Both are the same, JDM or export.
S
They are probably confused between "redline" (the mark on the gauge) and "max revs" (ignition cutoff). Both are the same, JDM or export.
S
12-12-2005, 01:35 PM
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Originally Posted by rotary_extreme
that makes me wonder what would the 3 rotor puerto rican rx-8 redline would be.
12-12-2005, 01:55 PM
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avtuall more rotors means more rotating mass and more stress on the e shaft and flexing SO more rotors does equal less redline. also i dont see where he said 3rotor renesis
12-12-2005, 01:59 PM
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I was assuming that's what he meant considering all he said was 3 rotor rx8 and thought the redline would be higher. I couldn't understand why he thought redline would be higher than 2 rotor renesis, considering it's not even the same thing.
Either way, if my assumption was wrong, his thought process was wrong also.
More goes into redline than rotating mass alone... More rotational mass but properly balanced can rev higher more safely than less rotational mass on stock balance.
Either way, if my assumption was wrong, his thought process was wrong also.
More goes into redline than rotating mass alone... More rotational mass but properly balanced can rev higher more safely than less rotational mass on stock balance.
12-12-2005, 06:03 PM
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Originally Posted by QBallz
I think that the Tach is off in the upper ranges 8500+rpm it seems to be off by about 250-300rpm.... Also I believe that actual cutoff is around 9300rpm.
12-13-2005, 10:45 AM
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Fab8 - Yup, the redline for JDM is 9000 rpm, with cutoff at 9500rpm - I have the JDM Type S model.
r0tor - the tac is off, but the fuel cutoff is exactly 9000 rpms (well at least thats what the ecu says it is)
Will this work?
Last edited by Slick8; 12-13-2005 at 10:50 AM.
12-13-2005, 11:52 AM
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Originally Posted by Slick8
What do we need to do to get that extra 500rpm on the tac? I plan on putting the taller 4.778 r&p in that will cause a 500rpm offset compared to the stock 4.444.
Will this work?
Will this work?
I don't think I understand your question... changing your rear gear will not effect your tach
12-13-2005, 04:28 PM
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If the JDM fuel cut off is 9500rpm, then I don't see a problem with changing the 9000rpm cut-off. Maybe a change for emissions? This would definitely generate higher peak power.
This would generate greater acceleration with a higher peak rpm, especially with the 4.778. It doesn't seem impossible, just need to fool the pcm. That is all.
This would generate greater acceleration with a higher peak rpm, especially with the 4.778. It doesn't seem impossible, just need to fool the pcm. That is all.
12-13-2005, 05:11 PM
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Originally Posted by Slick8
This would definitely generate higher peak power.
12-13-2005, 06:26 PM
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In my opinion, the issue is not tune or other simple mods for why it doesn't peak at redline. Either the ports just can't flow enough to keep making power up there, or the intake manifolds become a restriction and cannot flow enough.
Either way it's not a simple fix.
I don't really see why it matters much. Who cares if your power "peaks" 500 rpms later? It's not like the rx8 power dies completely past 8500, it just starts to fall. It still makes useable power past there, if it didn't Mazda would not have had the redline at 9000.
Either way it's not a simple fix.
I don't really see why it matters much. Who cares if your power "peaks" 500 rpms later? It's not like the rx8 power dies completely past 8500, it just starts to fall. It still makes useable power past there, if it didn't Mazda would not have had the redline at 9000.
12-13-2005, 06:34 PM
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Originally Posted by StealthTL
Since when does Wikipedia know anything????
They are probably confused between "redline" (the mark on the gauge) and "max revs" (ignition cutoff). Both are the same, JDM or export.
S
They are probably confused between "redline" (the mark on the gauge) and "max revs" (ignition cutoff). Both are the same, JDM or export.
S
It's Wikipedia... if you don't like it change it! :D
12-13-2005, 07:28 PM
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Originally Posted by Slick8
If the JDM fuel cut off is 9500rpm, then I don't see a problem with changing the 9000rpm cut-off. Maybe a change for emissions? This would definitely generate higher peak power.
This would generate greater acceleration with a higher peak rpm, especially with the 4.778. It doesn't seem impossible, just need to fool the pcm. That is all.
This would generate greater acceleration with a higher peak rpm, especially with the 4.778. It doesn't seem impossible, just need to fool the pcm. That is all.
