A new way to check vtec engaging???
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the power range in a stock D17 motor begins at around 4000.... so... thats why. now... youre afraid to slip and youre doing this? For a lot of us, it's icey out there.... so, folks use some common sense and logic before doing anything like this on icey/snowy surface.
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Rep Power: 290 I said "im not afraid". of course i did this only when no one was around. it would be stupid if a person did this on snow. I never said do it on snow, only on slippery roads. and I felt it skid on 4500-rredline. it doesnt spin any lower than 4500
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Rep Power: 310 someone is going to do this, crash into someone, get hurt or die, and sue the **** out of you. at least thats how californians do it....
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Originally Posted by Caucasian.Asian
someone is going to do this, crash into someone, get hurt or die, and sue the **** out of you. at least thats how californians do it....
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Originally Posted by Civic_RedLine
how about giving me points. You have alot yourself. I only want 3k to make a sticky
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Originally Posted by PunkingCivic
Get the Du-luck vtec indicator light.
It is a tad pricey but looks good!
It is a tad pricey but looks good!
rather invest in an a/f ratior gauge than that. vtec gauges are totally useless.
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Rep Power: 282 i have on installed on my car and was very suprised to see that the vtec is kicking in around 2500 rpms, in and gear. i thought it would have been the 4000rpms like you guys are saying, but its def at 2500, every time
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Originally Posted by Civic_RedLine
so your reputation will be better? who needs it.
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Originally Posted by robo1040
i have on installed on my car and was very suprised to see that the vtec is kicking in around 2500 rpms, in and gear. i thought it would have been the 4000rpms like you guys are saying, but its def at 2500, every time
on a D17 according to the electrical schematics honda manual, vtec engages the hi cam profile for the intake valves at 4200rpm.
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Originally Posted by S2000man01
you have your vtec gauge hooked up incorrectly.
on a D17 according to the electrical schematics honda manual, vtec engages the hi cam profile for the intake valves at 4200rpm.
on a D17 according to the electrical schematics honda manual, vtec engages the hi cam profile for the intake valves at 4200rpm.
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Rep Power: 311 4200 rpms sounds high. Where in the manual did you read that? I have the Helms manual and would like to read up on that. I always thought is VTEC kicekd in at ~2800 or so depending on oil pressure.
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Rep Power: 400 take a look at a dyno from a stock D17
notice the spike in torque right around the 4200-4300 area?
that's your hi cam vtec kicking in. 2800 is WAY off.
Most hondas have a set vtec engagement point for their high cam profile, including the D17. And in general the hi cam kicks in somewhere near the upper 2/3 of the rpm range. 2800 would kill performance since you are hitting a hi cam profile not made for such a low rpm.
But take the F23 engine for example, vtec engagement on this engine is variable depending upon load.
notice the spike in torque right around the 4200-4300 area?
that's your hi cam vtec kicking in. 2800 is WAY off.
Most hondas have a set vtec engagement point for their high cam profile, including the D17. And in general the hi cam kicks in somewhere near the upper 2/3 of the rpm range. 2800 would kill performance since you are hitting a hi cam profile not made for such a low rpm.
But take the F23 engine for example, vtec engagement on this engine is variable depending upon load.
Last edited by S2000man01; Jan 26, 2005 at 03:16 PM.
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Originally Posted by hotrodcivic2004
i think VTEC should be engaged all the time
vtec is a combination of using 2 different cam profiles for 2 different rpm ranges and combining them over the rpm range. it uses a low cam profile better for power at lower rpm, then switches over to a more agressive cam profile with higher lift/duration on the higher end of the rpm range.
so really vtec is always engaged. when someone refers to vtec "kicking in" what is happening is that hi cam profile being enagaged.
the reason THAT cannot be on all the time is that using a profile with such an agressive lift/duration during lower rpm would actually HARM performance and cause the engine to have a very rough idle or even stall.
