All Motor / Naturally Aspirated No power adders

To increase OR Not to increase RPM range

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Old Sep 12, 2008 | 02:15 PM
  #1  
jixen's Avatar
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Default To increase OR Not to increase RPM range

I search but couldn't find anything that would answer this question I have. But hopefully someone can enlighten me.

Lets say, you have a 85x89 built all-motor and it peak power at 8.7k with vtec engagement set at 6.6k. Now whether you drag/RR/auto-x, would you move the rev limiter to say 9-9.5k so when you shift in (drag/RR/auto-x) you stay in the vtec range?

Basically I'm asking if it is better to move rev limiter higher even though it is pass your peak power so you can stay in vtec range? Also what is the disadvantage and advantage if there is any?

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Old Sep 12, 2008 | 02:25 PM
  #2  
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Default Re: To increase OR Not to increase RPM range (jixen)

If you could, you really would want to increase the redline until you actually make the same amount of torque after shifting to the next higher gear, after calculating the gearing based torque multiplier.

The reality is that your engine probably can't rev that high safely, so we shift earlier.

The downsides of an increased redline? There's a reason people say RPM stands for "ruins peoples motors"...
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Old Sep 12, 2008 | 04:43 PM
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Default Re: To increase OR Not to increase RPM range (TunerN00b)

The short answer is Yes, you want to shift past your peak power point.

http://www.google.com
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Old Sep 12, 2008 | 07:47 PM
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Default Re: To increase OR Not to increase RPM range (TunerN00b)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2LEM1 &raquo;</TD></TR><TR><TD CLASS="quote">The short answer is Yes, you want to shift past your peak power point.

http://www.google.com</TD></TR></TABLE>

Sorry if I offended you with such a stupid question, I know I am such a noob. Yes you probably are more knowledgeable then me and I don't doubt that. Maybe I suck at searching too, but why waste time typing if you are not going to share your knowledge.
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Old Sep 12, 2008 | 08:20 PM
  #5  
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Default Re: To increase OR Not to increase RPM range (jixen)

Yes, you'll want to shift past your peak power. As far as wanting to stay in VTEC, if you have a smooth small-big cam transition, it shouldn't matter if you drop out. If your VTEC engagement causes a noticeable increase in torque, then I'd raise the shift point to stay in VTEC to stay in your usable powerband.
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