ECU and VTECH control Myth

Guys, sorry about this question but I had to ask it. there is a lot of things going on, and I just want to make sure I'm not fallin for other people crap. Is it true that if you get a VTECH controler, you can change the time that takes the VTECH to open, dont matter what ECU you are using? I mean, a LS/TECH (wiht a GSR head) will need a GSR ECU to work good, but I heard that you could take any VTECH ECU and set it up to open at any rpms that you want by using the control and it will work just fine. :screwy:

Please let me know..... Lest finish this Myth once and for all!!!!! :mad:

True. There are chips available, as well as stuff like the Apexi V-AFC. It's really only useful when you've got cams and get it tuned, so you're actually making power by changing the RPM in which vtec engages.

this isnt a myth everyone knows you can adjust vtec activation points

this isnt a myth everyone knows you can adjust vtec activation points
Yeah and almost everyones that it's VTEC not VTECH. :screwy:

and whats the lowest activation point that you could adjust the Vtec control to egage?..
I heard that its realy dangerus if you adjust it below 6500 rpms....

My friend with a 2.0 b16 has his VTEC controller to kick VTEC in at 4,400. But he also fully built top end and the meugen ECU.... not tuned...yet

and whats the lowest activation point that you could adjust the Vtec control to egage?..
I heard that its realy dangerus if you adjust it below 6500 rpms....

Normally it engages at 5500rpms and my D16 doesn't rev a whole lot more than 6500 so that would be pointless. Anyway, my Civic had some weird ass chip on it when i bought it and the guy had done work to it, but i didn't ask as to what kind of work and how much, but the VTEC on my Civic engages at 2500rpm at 3/4 or greater throttle. If you ease the car up, VTEC will engage at 5000 rpm. It only engages w/ 3/4 or greater throttle.

Most people have said that it is bad on the car, but i think it is sweet because it makes it fast off the line. And i still manage to get about 24 mpg in town, so it doesn't kill the gas mileage either.

what about the difference betwen the head and the block?, I want to do a LSVtec but all my friends are haters and they told me that a GSR will fried my pistons. is that true?

whats more expensive, buy a GSR or make a LSVtec?

I want to do a LSVtec but all my friends are haters and they told me that a GSR will fried my pistons.

I ment GSR head.....

Our J30A1 opens up at 3200 in 1st if you punch the gas just right... its an auto trans - i dunno if that makes a differnce or not

just because you activate vtec earlier, doesnt mean its making more power. if you activate it too early, you will lose power.

so whoever said it makes it faster, doesnt really know what they are talking aobut

Normally it engages at 5500rpms and my D16 doesn't rev a whole lot more than 6500 so that would be pointless. Anyway, my Civic had some weird ass chip on it when i bought it and the guy had done work to it, but i didn't ask as to what kind of work and how much, but the VTEC on my Civic engages at 2500rpm at 3/4 or greater throttle. If you ease the car up, VTEC will engage at 5000 rpm. It only engages w/ 3/4 or greater throttle.

Most people have said that it is bad on the car, but i think it is sweet because it makes it fast off the line. And i still manage to get about 24 mpg in town, so it doesn't kill the gas mileage either.

Lowering the vtec point to 2500 rpms is stupid and it will not give you more power off the line. The point of vtec in the first place is to try to give you the best of both worlds, good low end torque, while still giving you good top end power. I would be willing to garuntee that if you lower your vtec that low you will see much slower 1/4 mile times

i just want to die after reading all of this

just remember ace, you know whos right. and i can explain how you find the right vtec activation if you wnat

just remember ace, you know whos right. and i can explain how you find the right vtec activation if you wnat
hahha i know just the whole thing still depressing

that will be great, cause I was reading a bout timing gear cams (or something like that), and I wanered what it has to do wiht the Vtec activation?
by the way, try to post the perfect combo for a GSR... thanks.

Whatever. You guys can make fun of it all you want, but i didn't install it and i don't plan to change it either. I have beaten other Civics w/ almost the same set up as mine...the only diff was the chip.

Ok, i'm not trying to be a dick or anything here, nor am I trying to make fun of you; but from a technical standpoint, vtec engagement at anything lower than the factory setting does not give you any gains, unless you have an aftermarket cam designed to take advantage of vtec engagement at that given rpm. Honda set vtec at the point they did for a reason, changing it without proper mods to pair it with will not give you any gains, and may even slow you down. This has been tested many times.

Also, its impossible that it would make you go faster off the line since the vtec cam profile wasn't designed to make lower end power. In fact, early activation makes you bog and even lose power. Even if your vtec engagement was set at an optimal point, whatever rpm that may be, I doubt it would make a difference in power since only the intake valves are affected, and I doubt sohc vtec lobes are very aggressively profiled at all.

The reason you are able to maintain you gas effiency is because you are only sohc, so only the intake valves are affected.

imho, you beating other Civics can be attributed to driver skill, not your chip.

EDIT: And how are you even sure your vtec engages at 2500rpm (besides the other guy's word). Most sohc vtec owners I know say that their vtec engagement isn't even audible, nor could they even physically feel it kick in. Do you have an indicator light wired up? and don't say you can feel it kick in because all you really should be feeling with it engaging that low is the bogging.

couldnt have said it any better myself

Ok, i'm not trying to be a dick or anything here, nor am I trying to make fun of you; but from a technical standpoint, vtec engagement at anything lower than the factory setting does not give you any gains, unless you have an aftermarket cam designed to take advantage of vtec engagement at that given rpm. Honda set vtec at the point they did for a reason, changing it without proper mods to pair it with will not give you any gains, and may even slow you down. This has been tested many times.

Also, its impossible that it would make you go faster off the line since the vtec cam profile wasn't designed to make lower end power. In fact, early activation makes you bog and even lose power. Even if your vtec engagement was set at an optimal point, whatever rpm that may be, I doubt it would make a difference in power since only the intake valves are affected, and I doubt sohc vtec lobes are very aggressively profiled at all.

The reason you are able to maintain you gas effiency is because you are only sohc, so only the intake valves are affected.

imho, you beating other Civics can be attributed to driver skill, not your chip.

EDIT: And how are you even sure your vtec engages at 2500rpm (besides the other guy's word). Most sohc vtec owners I know say that their vtec engagement isn't even audible, nor could they even physically feel it kick in. Do you have an indicator light wired up? and don't say you can feel it kick in because all you really should be feeling with it engaging that low is the bogging.

well done!

I don't know what is all done to the engine. I didn't do anything to it internally, but the guy i bought it from had worked on it and told me that VTEC engages lower than a normal Civic and when we drove it, he pointed out when it engaged and told me what i told you guys above. When you hit 2500rpm, the car surges forward and makes a little whistling noise because it pulls more air past the butterfly valve in the throttle body.

It is hard to explain, but if you drove it, you'd know something is different. I have dirven my friend's 98 Ex coupe w/ the same mods as my car externally (except for the header) and his car is obviously slower than mine. I don't know what to tell you guys, but i was told this and i went with it. I haven't torn into the engine, but i'm sure that something else must be done to it internally. Anyway, i didn't know that lowering the VTEC rpm slowed the car down so thanks for that bit of info. Thanks guys!

What do you think is done to my car then? You can really notice a change at 2500rpm when you go from half throttle to full throttle. You can ride the rpms up slowly until 5000 and then there is a little more kick, but if you step it down over 2500, then you feel a big kick too. He said that was the VTEC that he had reset, but honestly i'm just telling you what he said, whether he was lying or not is a different story.

wait i also have a question...if u have a chip ecu, can u also have a v-tech controller...sounds stupid, but many ppl i knoe say u cant combine both...j/w...and if u could wut brand chip tat will go well with 1st generation apexi controller...?

yeah its true...the vtec controller changes your vtec engagement points..but if you want more boost out of your gsr get a bigger cam. Dont go changing your vtec points low otherwise you wont get nuttin out of it. It's been a while since I drove a gsr so i dont remember when the vtec engages. Brother of mine had one and he was always fuckin' wit me know his car was faster than mine, but if i would of done more modification i would of smoked him regardless if he had a vtec controller or not