Vtec Cam Killers
#11
Originally Posted by fuzy24,Dec 19 2005, 12:01 PM
...I'd say that getting rid of them for a little better top end is not too bad of a trade off..
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Originally Posted by cdelena,Dec 19 2005, 10:10 AM
Losing the low cam buys you practically nothing. For a track car you might change the profile of the high cam and the point you engage it, but having a car that still idles and drives in the pits is the advantage to VTEC.
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Originally Posted by JDMwhore,Dec 19 2005, 03:48 PM
So youre saying you'd keep vtec on a track only car so its eaiser to drive around the pits?? Don't you think it would be more of a advantage to lose some weight on the top end and make things more simple up there, and get the bonus of freeing up some HP.
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Originally Posted by nodisguise,Dec 19 2005, 04:43 PM
You'd probably complicate things by trying to take VTEC off. The car would be seriously undrivable on the big lobes at low engine speeds, and you'd gain like 2 hp up top.
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Originally Posted by mikegarrison,Dec 19 2005, 04:49 PM
Just curious, JDM, how many track miles did you have on your S2000 in 2005? I had about 2500.
#17
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Originally Posted by JDMwhore,Dec 19 2005, 05:15 PM
Toda has been producing these for quite a while for every other Vtec engine.
But no skin off my back, I guess. It's your car, do with it what you like.
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Originally Posted by mikegarrison,Dec 19 2005, 05:26 PM
There's a whole lot of "tuner" parts out there. At the track you can usually tell who has them because their cars are either slow or sitting in the paddock being furiously worked on.
But no skin off my back, I guess. It's your car, do with it what you like.
But no skin off my back, I guess. It's your car, do with it what you like.
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Originally Posted by mikegarrison,Dec 19 2005, 04:49 PM
Just curious, JDM, how many track miles did you have on your S2000 in 2005? I had about 2500.
I am still waiting for that track report on the Stoptechs from years ago.
#20
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Originally Posted by mikegarrison,Dec 19 2005, 07:49 PM
Just curious, JDM, how many track miles did you have on your S2000 in 2005? I had about 2500.
The VTEC Killer cams are a race-only design. You said you had 2500 track miles in 2005. How many of those miles were spent below 6000 RPMs? Disregarding warm-up and cool-down laps and yellow-flag situations, if you say more than 0, then you were doing something wrong.
If you're never below 6000 RPMs, then you're never using the low-cam profile. If you're never using it, why keep those extra lobes on there adding extra rotational mass, and extra stress on the camshaft itself. Additionally, why keep the extra parts on the head that are increasing friction and resistance? On a pure-race car, there is no reason for any of that stuff.
Technically, if you build a race engine that spins to 11K RPM, you could theoretically get custom VTEC cams that are designed with the "low" lobe optimized for 5-8K RPMs and the "high" lobe optimized for 8-11K... but I suspect that if you're turning 11K RPMs, you're definitely not going to want that extra mass rotating around your camshaft.
Now... all of this is in relationship to a pure race-bred, track-only car. If you still need some street-ability for your engine, then VTEC Killer cams would not be an option, because I doubt they will even idle below 2 or 3K RPMs.
If you still think that VTEC Killer cams are detrimental to a race engine's performance, please explain your logic behind it, rather that quoting how many track miles you have this year. Anybody can drive on the track... but not everybody can build a high-performance motor.