Why Do S5 Redline Higher Than S4?
07-14-2005, 12:08 PM
#11
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Join Date: Jun 2005
Location: Jacksonville, FL
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I don't believe you'll blow anything. You'll more then likely just fry something inside your engine because you're exceeding it's operational range. If you're going to do that I recommend not doing it very often and keeping an eye on your temp gauge. But that may not be the case. You could blow something.
07-14-2005, 12:32 PM
#12
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Join Date: Jul 2005
Location: Ontario, Canada
Posts: 45
few reasons the S5 non-turbo had a 1000 rpm higher redline:
- the intake manifold allowed for a slightly higher powerband
- more importantly, if you were to shift at 7000 on an S5 NA, when you drop into the next gear you aren't in the best place relative to the powerband. even though power drops off around 7500, it's still worth more to shift from 8000.
if you are slow on the shift from 7000 rpm, you will drop BELOW the VDI valve activation rpm. that's why you shift at 8k for maximum use of the powerband
- there were a few internal design changes that were seemingly due to the higher rev limit, but really not too much different from the S4
i have a rebuilt S4 core in my S5 NA, and i take it to 8000 rpm all the time...
- Aaron
- the intake manifold allowed for a slightly higher powerband
- more importantly, if you were to shift at 7000 on an S5 NA, when you drop into the next gear you aren't in the best place relative to the powerband. even though power drops off around 7500, it's still worth more to shift from 8000.
if you are slow on the shift from 7000 rpm, you will drop BELOW the VDI valve activation rpm. that's why you shift at 8k for maximum use of the powerband
- there were a few internal design changes that were seemingly due to the higher rev limit, but really not too much different from the S4
i have a rebuilt S4 core in my S5 NA, and i take it to 8000 rpm all the time...
- Aaron
07-14-2005, 12:54 PM
#13
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Join Date: Dec 2002
Location: cragsmoor NY
Posts: 591
s5 also has hardened stationary gears.
Anyone have any experience in the differences between a hardened and unhardened stationary gear when it comes to higher rpms? I just wondered if it made a big difference or not.
-Dan
Anyone have any experience in the differences between a hardened and unhardened stationary gear when it comes to higher rpms? I just wondered if it made a big difference or not.
-Dan
07-14-2005, 05:56 PM
#14
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Join Date: Jul 2005
Location: Ontario, Canada
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[quote name='annuerysm' date='Jul 14 2005, 01:54 PM']s5 also has hardened stationary gears.
Anyone have any experience in the differences between a hardened and unhardened stationary gear when it comes to higher rpms? I just wondered if it made a big difference or not.
-Dan
[/quote]
i don't think the difference is "hardened" and "unhardened", it's just that they wen through a different treating process.
i would expect this would only make a difference in LONG term reliability or under high-stress applications. but the reliability issue was foremost to them doing that, which is really only beneficial after 10 years or so...
Anyone have any experience in the differences between a hardened and unhardened stationary gear when it comes to higher rpms? I just wondered if it made a big difference or not.
-Dan
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[/quote]
i don't think the difference is "hardened" and "unhardened", it's just that they wen through a different treating process.
i would expect this would only make a difference in LONG term reliability or under high-stress applications. but the reliability issue was foremost to them doing that, which is really only beneficial after 10 years or so...
07-15-2005, 04:54 AM
#16
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Location: Honolulu, Hawaii USA
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12-07-2005, 12:02 PM
#19
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Originally Posted by mail-man' post='784510' date='Dec 7 2005, 12:57 PM
ok i was wondering i got a 87 n/a rx7 and when i push it goes all the way to 8,000 can 87 motors go that high
12-07-2005, 12:09 PM
#20
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Join Date: Nov 2003
Location: San Antonio Tx
Posts: 516
stop revving so damned high theres no point jesus... you dont need to rev to 8500rpms to get the civic to race you... s5 n/a's were the only ones that had a 8k redline... you can rev your motor as high as you want but just know its gonna eventually fry something