Honda Civic Performance - JDM Discussion Engine tech, forced induction, springs, shocks, brakes, tires, etc.

what rpm for vtec

Old 24-Mar-2006, 11:59 AM
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what rpm for vtec

hey guys,

I know this has been asked before and i did try searching but to no prevail. pls don't get over excited and bash me for not continuing to search.

i just got my new d15b vtec installed into my dx and i need to get my comp chipped. what is the factory setting for the vtec to kick in. i have short arm intake and will get headers and exhaust shortly so is there a diff rpm setting i should get it set at? i just want it to be set at the most optimal setting possible, nothing over agressive.

thanks guys!
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Old 24-Mar-2006, 01:27 PM
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For Vtec to kick in the factory one would be 5400rpm.
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Old 24-Mar-2006, 02:49 PM
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5500
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Old 24-Mar-2006, 02:51 PM
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^^^^yup. Stock p08 is 5500, p28 is 4800 or 5500.
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Old 24-Mar-2006, 04:18 PM
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thank you, thank you....and zeeman let me know about the chipping stuff.
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Old 24-Mar-2006, 06:14 PM
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make sure you match it to your transmission,

you don't want to put it to low and then be in vtec all the time while on the highway or something.

I have it set at 5200rpm, on the highway I cruise around 4300+. if I'm speeding I'll approach 5000. so 5200 is the lowest I can go before vtec'ing when I don't want to.
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Old 25-Mar-2006, 10:44 AM
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good idea capthowdy, i did want it to be a bit lower than 5500rpm but at the same time wouldn't want it to kick to early. 5200rpm sounds nice!
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Old 28-Mar-2006, 09:48 AM
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On my stock P30 I've seen to be hitting it close to 6000rpms on a JDM b16 ... Seems a bit high or is this normal.
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Old 29-Mar-2006, 12:22 AM
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why does my vtec kick in at 5800 . i have a 2000 sir engine usdm
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Old 29-Mar-2006, 12:26 AM
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my vtec kicks in at 5500. it's on a d16z6 and i was actually surprised the first time it engaged because i could actually hear it. i couldn't feel it like on a b series though .
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Old 29-Mar-2006, 01:06 AM
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vtec kicks in at 5800 on p30s and P2Ts thats why
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Old 29-Mar-2006, 09:15 AM
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on my p2t, vtec kicks in exactly at 5500
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Old 29-Mar-2006, 10:09 AM
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Thanks Zeeman .. I was pretty sure it used to kick in at 5500 rpms . but then again my tach probably isn't the most accurate anyway. But 5800 seems to be where its coming in. so all is good.
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Old 29-Mar-2006, 11:23 AM
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man, i don't get why honda changed where vtec kicks in on all of their ecus. Its so confusing. P30 kicks in at 5800 while the p2t kicks in at 5500 while some p28s kick in at 5500 and other at 4800, pr3s kick in at 4800 or 5500 and the p72 at 4800.
But if you chip your ecu you can basically set vtec to kick in where ever your heart desires, but i wouldn't change it much from stock, unless you think you're smarter than a group of japanese engineers with endless resources.
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Old 29-Mar-2006, 12:35 PM
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Originally posted by zeeman
....but i wouldn't change it much from stock, unless you think you're smarter than a group of japanese engineers with endless resources.....
Or.... unless your on the dyno and you can actually quantify the results.

You can see HP gains by adjusting the vtec point, but it all depends on your setup and where you want your powerband.
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Old 29-Mar-2006, 01:33 PM
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but on a stock engine, or even one with bolt-ons, like 90% of the people on here, you will see minimal gains, if any from changing the vtec crossover point.
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