Factory VTEC ingagment ponit for P28
11-09-2005, 11:01 AM
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Factory VTEC ingagment ponit for P28
I have a P05 (DX non-vtec) ECU that I cjipped and made it into a P28. I used the Uberdata program software to do so. I was wondering what the factory vtec engagement point was (like what RPM). Right now it's @ 4475. I wired an LED light to let me know what the RPM was at when it actually started to come on. And my SIR clusters tach says that it engages before 4500. Is this right? Or do I need to burn another chip to insert in order to keep it within the right range.
11-09-2005, 01:56 PM
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Re: (hwystar92)
generally vtec kicks in around 5250 because that is where your hp and torque curves cross. I'm not 100% sure on the stock p28 crossover, but all you need to do is make sure you don't fall out of vtec when shifting at redline and you'll be good. I wouldn't set it lower than 4500 though, because you may not have the oil pressure to engage it. it won't hurt anything to lower it past that, but you're not going to drop time in the 1/4 by lowering it either.
11-10-2005, 07:32 AM
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Re: (hwystar92)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hwystar92 »</TD></TR><TR><TD CLASS="quote">But my question is, will it hurt my valve train or motor?</TD></TR></TABLE>
you didn't ask this, and it will not hurt your valvetrain. it's just like when vtec normally kicks in just happens at a lower rpm. so unless vtec hurts your motor doing it sooner won't hurt anything. but like previously stated, if you don't have the oil pressure it won't work.
you didn't ask this, and it will not hurt your valvetrain. it's just like when vtec normally kicks in just happens at a lower rpm. so unless vtec hurts your motor doing it sooner won't hurt anything. but like previously stated, if you don't have the oil pressure it won't work.
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11-10-2005, 08:24 AM
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Re: (flashdance)
NO, the stock vtec control in a stock p28(d16z6) ranges from 4800-5200, depending on oil pressure, coolant temperature, load and a few other variables, if you set it to a specific rpm via uberdata these parameters negated with the exception of when the car is not warmed up uberdata will actually use the vtec crossover point as a rev limiter, till the car is up to opertaing temperature.
11-10-2005, 08:25 AM
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Re: (IHateJDM)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IHateJDM »</TD></TR><TR><TD CLASS="quote">generally vtec kicks in around 5250 because that is where your hp and torque curves cross. I'm not 100% sure on the stock p28 crossover, but all you need to do is make sure you don't fall out of vtec when shifting at redline and you'll be good. I wouldn't set it lower than 4500 though, because you may not have the oil pressure to engage it. it won't hurt anything to lower it past that, but you're not going to drop time in the 1/4 by lowering it either.</TD></TR></TABLE>
you should have around 70-80psi of oil pressure at 3000 rpm, and if you have a boosted motor vtec engagement benefits below 4500rpm
but you also have to account spool time et cetera. As for engaging around 520 that has nothing to do with it. The vtec engagement point should be not be felt what so ever when it engages, you should only hear it, otherwise it isnt tuned properly. It just depends on what cam you have and the flow of the motor on where it engages not when the torque and hp lines cross 
you should have around 70-80psi of oil pressure at 3000 rpm, and if you have a boosted motor vtec engagement benefits below 4500rpm
but you also have to account spool time et cetera. As for engaging around 520 that has nothing to do with it. The vtec engagement point should be not be felt what so ever when it engages, you should only hear it, otherwise it isnt tuned properly. It just depends on what cam you have and the flow of the motor on where it engages not when the torque and hp lines cross
11-10-2005, 10:12 AM
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That was a very good description of what I wanted to know. Yes I do feel it when it kicks in. I know that actually the oil pressure is what cause vtec not a specific RPM. So I guess it was a stupid question, kinda? Oh well, I love my JDM D15!
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