Does anyone know if there is a VVT-i contoller? Jackson Racing has a product called a Vtech contorller that lets you dial in when the Vtech kicks in. Instead of opening everything up at about 6000 in a Vtech engine the Vtech contorller let you dial in at what RPM you what the Vtech to kick in. This essentially brings on the HP and Torque sooner. It does not give you the same effect of a full blowen turbo, but somewhat of a poorman's version. With exhaust and an intake, i am sure it makes a world of a difference.

Just wondering!

I'm not 100% on this, but it's been explained to me that unlike V-TEC which "kicks in" at certain RPM's, VVT-i is controlled continuously. It doesn't "kick in," but rather is constant throughout the power band.

If anyone knows anything about this, please send it!

I believe, the VVT-i is a total different set up than the Vtec. The Vtec is activiated by a solenoid which locks the rocker arms together so it will only ride on the cam lobe that has the higher profile. But the VVT-i only advances and retards the timing. It doesnt have the kick like the Vtec.

there is not vvt-i controller since that power is already provided throughout the power band.

All the above posts are true
VVT-i does not kick in at certain RPM, it gain with the RPM

i guess if it was to kick in, then it would be 1rpm

Like others have said...VVTi is continuous, with no certain powerband point that it "kicks" in at. V-Tec has a certain RPM that it comes through at, so you can get one of many VTec controllers, such as the Apexi V-Afc, etc.

Also, VTech makes phones.

I forgot what the " I " meant. I know the others are V ariable V alve T iming. But I forgot what the I stood for.

Variable Valve Timing with Intelligence. I'm not sure how intelligent it is though....That knightrider car was a hell of a lot smarter than my xB!

The way that the VVT-i handles the timing is something that should be looked into, but is there a way to reverse engineer it from the ECU?

Or at least understand how it modifies timing, because from what I've been told it is a matter that it only effects at startup and low RPM in order to reduce emissions and modify low end power...

if that's the case then it wouldn't be much of a worry for doing performance mods, but if it does do quite a bit throughout the power band then how do you tune to that without know just what it is doing? I realize VTech modifies lift and timing, and our VVT-i is just timing, but still something to consider...

does anyone know where i would be able to purchase a controller?

If it is for a V-Tec engine, Jackson Racing has one.

does anyone know where i would be able to purchase a controller?

if it is for a honda/acura then there a lot of companies that make one. if you are looking for one for toyota then you are out of luck there as it is not required.

okay i have seen "vvt-i" and i have also seen some cars in the toyota lineup with "vvtl-i" now...is that simliar to vtec since it's variable valve timing lift electronic control intelligence? or are vvt-i and vvtl-i one in the same thing? correct me if im wrong. :?: :roll:

okay i have seen "vvt-i" and i have also seen some cars in the toyota lineup with "vvtl-i" now...is that simliar to vtec since it's variable valve timing lift electronic control intelligence? or are vvt-i and vvtl-i one in the same thing? correct me if im wrong. :?: :roll:

Yeah, a few days after getting my xA, I drove my friend's Celica GTS again and Lift was just awesome. I wish I had Lift in my xA :cry: I got back into my xA and it felt like I was driving a golf cart...

Also, my friend had a Field VTEC controller on his Si. He was playing around with it (looking at the settings) while he was driving when he mistakenly changed something. The car freaked out and it started to go into VTEC at low RPMs. It was funny...

VVT-i isn't like VTEC, but VVTL-i (found in celica gts) is like VTEC. The L stands for "Lift" but i call it "toyota's VTEC" puahahha


edit*
plus changing when the VTEC kicks in isn't always good because it should be a linear power curve and if VTEC kicks in too early, your car will bog and there would be a loss of power instead of a gain.

Veribal Valve Timing - Intelegence

the - means with

so veribal valve timing with intelegence

Funny thing is... the Lexus IS300 touring race car they removed all the VVTi components with the remakrs of "less things to break" and " we are not concerned about emissions"... is it just a way for our cars to run clean at lower RPMs and be the most it can be at higher? I see it as them making VVTi to kep from having to reduse ALL performance for emissions.. but just adjusting the performance out to tolerable amounts in the lower RPMs...

VVT-i isn't like VTEC, but VVTL-i (found in celica gts) is like VTEC. The L stands for "Lift" but i call it "toyota's VTEC" puahahha


edit*
plus changing when the VTEC kicks in isn't always good because it should be a linear power curve and if VTEC kicks in too early, your car will bog and there would be a loss of power instead of a gain.

I found this to be true, VVT-I is a design that the motor has so when the timing is off just a little bit the computer will adjust the timing to the perfect setting for optimum performance. A VVT-I controller is not available, because the computer does the thinking for you and does not need to be controlled.

VVTL-I is similar to vtec for a boost in performance and may have an aftermarket controller for it, but we would probably need to hit up another forum for it.

Anyway--listen up dude--VVTI is nothing like VTEC. VVTL-I is something along the lines of VTEC...

This qoute by JDMxB was in another topic called CRAZY AZZ TURBO KIT CHECK IT OUT

vvti control the phase timing between when the intake and exauhst valves open.
this way you can get 0 overlap at low rpms and some overlap at higherrpms, optimzing fuel efficiency and make the powe band flatter.

vtec actually changes the lift of the cam at a specific rpm. This allows them to use a low lift setting at lower rpms for better low rpm power and fuel efficiency, and a big cam at high rpms for maximum power production.

from a pure horsepoower production standpoint, a vtec system is going to have more potential all else being equal. Being able to 'switch' to a huge lift cam at high rpms is a huge win. Simply changing *when* the intake and exauhst valves open is a bit more subtle.

anyway, could aftermarket control of vvti be useful? I wouldn't expect so on a near stock engine, when you floor the gas pedal it likely goes to optimum horsepower settings.

I wouldnt expect a vtec controller to be useful on a stock honda either.

vvti control the phase timing between when the intake and exauhst valves open.
this way you can get 0 overlap at low rpms and some overlap at higherrpms, optimzing fuel efficiency and make the powe band flatter.

vtec actually changes the lift of the cam at a specific rpm. This allows them to use a low lift setting at lower rpms for better low rpm power and fuel efficiency, and a big cam at high rpms for maximum power production.

from a pure horsepoower production standpoint, a vtec system is going to have more potential all else being equal. Being able to 'switch' to a huge lift cam at high rpms is a huge win. Simply changing *when* the intake and exauhst valves open is a bit more subtle.

anyway, could aftermarket control of vvti be useful? I wouldn't expect so on a near stock engine, when you floor the gas pedal it likely goes to optimum horsepower settings.

I wouldnt expect a vtec controller to be useful on a stock honda either.

Exactly! 8)

0 overlap at least on the exhaust side(kinda stupid to use vvt-i on just the intake tho) is very bad for n/a cars. It decreases lowend torque. But Im not sure the effects on the intake side, seems like it might do some good. I would not call the ECM thinking for you a good thing because it thinks on terms of stock setup which when your looking at this kind of thing your most likely not stock. I'd much rather have a motor like the one in my stealth where the timing is advanced and retarted based on knock counts. Even then I can override it. Anyone think of a timing controler. They do exist Apexi makes one but might yeild some control. But any controler will just be masking the problem. Someone needs to dump the code from the ECM onto a computer and go thru it redoing some stuff thats wrong. I know someone dumped the code on a 95 vr-4 spyders ECM and it was all assembly type of code. So reprograming it shouldn't be a major problem. With current technology most cars come with flash programmable ECMs to that may make it easier. Just some food for thought. I can't wait to get my scion so I can poke around and test some stuff.

Iamslow, your post reveals that you are a bit confused.

you are confusing ignition timing with valve timing.

0 overal on the exauhst side is a statement that doesnt make sense. the meaning of valve overlap is when bost valves are open. you cant have overlap on just one side.

your stealth is changing IGNITION timing based on knock. (when the spark plugs fire)

VVTI changes VALVE timing. (when the valves open up)

VETEC changes valve LIFt (how FAR the valves open up)

got it?


and 0 overlap is goood for low rpm power. you know how people idiotically post here all the time about have exauhst that is TOO free flowing causing a loss of low rpm power? This used to be (somewhat) true on cars that had lots of valve overlap at low rpms. But it much less of an issue on a car with variable valve timing. there is no overlap so you don't need backpressure.


0 overlap at least on the exhaust side(kinda stupid to use vvt-i on just the intake tho) is very bad for n/a cars. It decreases lowend torque. But Im not sure the effects on the intake side, seems like it might do some good. I would not call the ECM thinking for you a good thing because it thinks on terms of stock setup which when your looking at this kind of thing your most likely not stock. I'd much rather have a motor like the one in my stealth where the timing is advanced and retarted based on knock counts. Even then I can override it. Anyone think of a timing controler. They do exist Apexi makes one but might yeild some control. But any controler will just be masking the problem. Someone needs to dump the code from the ECM onto a computer and go thru it redoing some stuff thats wrong. I know someone dumped the code on a 95 vr-4 spyders ECM and it was all assembly type of code. So reprograming it shouldn't be a major problem. With current technology most cars come with flash programmable ECMs to that may make it easier. Just some food for thought. I can't wait to get my scion so I can poke around and test some stuff.

HKS does make VVT-i controller, BUT it's a complete kit with cam shaft and ONLY for 1JZ-GTE or 2JZ-GTE ENGINES ONLY.
http://www.hks-power.co.jp/products/engine/valcon/valcon.html
this is the product, even though it's for different toyota, its good to know VVT-i is controllable, if you spend enough money into it. :roll:

i see. i dunno how the ignition part got in there. lol

HKS does make VVT-i controller, BUT it's a complete kit with cam shaft and ONLY for 1JZ-GTE or 2JZ-GTE ENGINES ONLY.
http://www.hks-power.co.jp/products/engine/valcon/valcon.html
this is the product, even though it's for different toyota, its good to know VVT-i is controllable, if you spend enough money into it. :roll:

That sounds like a replacement system rather than a "Controller", but either way HKS is stil teh shizzle full-bore & hard-core.