I was wondering if anyone can help before I go and try to mess with this and mess something up. Here's the problem: I have the old DataSystem Vtec Controller. It doesn't need any wire cutting, it plugs right into the ECU from its harness. It looks just like this spoon one: http://www.preludecrazy.com/gallery/elec.php You have to click on the spoon vtec controller to see the image. It has a dial just like that one and has yellow harness plugs instead of black. I don't have the manual, I can't find it online, and all the DataSystem websites are in Japanese. Please respond to this if you know anything about this Vtec Controller and how to use it (or if you know how to use the Spoon one that will help too). Oh yea, I did try plugging it in. I left it idle and the little light was red and when I turn the dial switch the light turned green (I think it activated Vtec) and then my engine almost idled out. I am thinking about driving around with the dial not turned (so the light is red) and when I need it to hit Vtec, I'm going to turn the switch. The problem is that I don't know if this will set the Vtec at that or not. I wanted some peoples input on this before I try this. Thanks so much if anyone can help.

The point is that my ECU is chipped to a 9500 redline and to the dc header, skunk2 manifold, and crower stage 3 specs. Vtec still kicks in at 4400rpm (which is too low) so I don't want to mess anything up in the process of trying to set Vtec higher with this old Vtec Controller that I know works but I don't know how to use. Thanks Again!

 

I would have thought that turning the **** right up would leave the vtec coming in at very high revs, and that by turning it down again brings it in lower. try screwing the **** full way around to the end, and listen to when you vtec comes in, if it doesnt then assume that vtec is set at a high x-over point, then drive at steady rpm, say 5000rpm, and screw the **** down till the light comes on, this i would again assume is now bringing the vtec on at 5000rpm. i'm not 100% sure if this is correct, but if its only a vtec controller, then you cant do much harm messing around with it till you figure out how it works, just dont go revving the **** out of your engine while trying to figure it out.