Vtec Controllers

hahaha, yep Coolies got owned definately.

Well I think a piggy back like a VAFC, SAFC etc are partly show and aprtly go. Yes u do get some gains from them in power, noit as much as a full tuneable ecu, but then again compare the prices of the 2 things. one ranges from 750 installed and tuned, another 2,000 installed and tuned.

Switching VTEC in earlier than 5,500 rpms will result in a power loss. No matter what air fuel ratio ur going to run, what ignition, etc, early VTEC engagement is not beneficial simply cos the Second Cam profile wont make anymore power below this, in fact the overlap that the aggressive cam provides will make u lose power.

Coolies ran a greddy that was poorly tuned, not only did he get poor fuel economy, he was actually slower than my stock car.

In summary, the piggy backs are an option fi u dont intend to modify the car much. they do make gains, but vtec swithcing alone wont.

cr@p.. I didnt know you actually lose power from vtec contollers.. if that were the case y would they have invented them?

also I was going to get the vtec controller add-on for my unichip the geeks that work at the shop that do this stuff reckon it will make a big improvement.. I dont know so what do u all reckon.. Im guessing no from what I have read above :roll:

delete

The VAFC is able to adjust the VTEC crossover points, as well as the fuel....but i would say that most people (who buy it other than just for the bling) would use it mainly for the fuel.....if you have different cams, then it might be worthwhile tuning in the vtec crossover, but otherwise it appears not...

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Originally Posted by VTEC16

you have different cams, then it might be worthwhile tuning in the vtec crossover, but otherwise it appears not...

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MOST cams are designed to engage hicam at 5500rpm. I would doubt anything less the specificly designed cams would require moving the changeover point. I know none of the Toda cams from spec A - C need moving, obviously spec D's do - because they are VTEC Killers....

I dont really have experience with changing cams....but i didnt think it was as clear cut as that? depending on one's setup, isnt it possible that a smoother curve would be obtained by tuning the crossover point on more substantiall modded engines? ...or is this just some theory i concocted in my head?

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Originally Posted by VTEC16

I dont really have experience with changing cams....but i didnt think it was as clear cut as that? depending on one's setup, isnt it possible that a smoother curve would be obtained by tuning the crossover point on more substantiall modded engines? ...or is this just some theory i concocted in my head?

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the latter.. not too sure what you are saying to be honest

....if you moved the crossover point, you obtain a smoother power curve from adjusting the X-over point...and hence gain some midrange?

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Originally Posted by VTEC16

....if you moved the crossover point, you obtain a smoother power curve from adjusting the X-over point...and hence gain some midrange?

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this would be a cam thing, so it would be cam dependant. I haven't come across a cam that isn't designed to go on hi at 5500, therefore the changeover stays the same

ok fair enuf....thanks for the insight ;)

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Originally Posted by VTEC16

ok fair enuf....thanks for the insight ;)

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hope that makes sense...
I might be wrong too, need dynodave or an expert to be precise about an explanation....

ok cool...