Alright heres a question. Its a lil late cause my rollas going bye bye for an 05 civic and a 94 sentra that can murder..... Everyone knows the civic Vtec controllers... well since my car has VVT-i i was wondering if anyone ever made a controller for it. It would be a good idea in my opinion cause this rollas points arent so stellar...
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Team SLIP
2000 Toyota Corolla
suspended liscence.....
There is no such thing as a VVT-i controller as there is really no need for one as with the civic. The thing with VTEC is that it only kicks in at certain revs and at open throttle position, hence the use of lowering it.
With VVT-i the computer determines when the valves will be variable so it actually runs at idle to conserve fuel, when the acceleration hits a certain point, at open throttle and a whole range of other factors. This is the reason for the -i at the end. You will also notice that there is no such thing as an i-VTEC controller either. This is the same reason as why the toyotas dont have or need one.
In short, the only engine that actually needs one is the 20v Silvertop, as this was the only Toyota engine developed without inteligent VVT. But the engine is'nt popular enough, so it will never be done.
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- 2001 AU Ford Fairmont Station Wagon (The Family Taxi)
The blacktops seem to work like this, as described on Club4AG -
1. Starting. When you crank the starter there will be VVT operation until the engine fires up, obviously to allow more air into the engine to allow an easier fire up.
2. Coolant temp. There is absolutely NO VVT operation when the coolant tempt is below 50°C except for that brief moment when you operate the starter. Reason obvious, who want to stress a cold engine.
3. Engine rpm. VVT will operate in any rpm between the range of 1500 and 7200 when the inlet manifold pressure is right. The min and max range can be a little out because I was reading from the car tacho. Trust me they are very close.
4. Engine load/inlet manifold pressure. This seems to be the single most important parameter controling the system. The VVT will NOT operate if the inlet manifold has more than about 5 inches of vacuum (can't get the exact reading because everything happen so fast. It's very close.). This is very close to zero vacuum which is atmospheric and that is about the maximum load the map sensor will read to tell the engine in an NA car. As you can figure out the throttle will usually be in the more than 3/4 position for this to happen.
5. VVT will work without the speed sensor.
That is basically what i said in my last post, only in laymans terms.
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- 2001 AU Ford Fairmont Station Wagon (The Family Taxi)
There is a breakout box....for the New toyota engines that work great, I have imported a couple from Japan. They even come in english but you haveot have a laptop to modify anything.
Kwanza what do u think that its doing? When it adjusts the timing it is turning the cam gears, you can see how it works if you take off the plastic cover. The only way to control it is using a piggyback computer or whats also known as a breakout box.
Kwanza what do u think that its doing? When it adjusts the timing it is turning the cam gears, you can see how it works if you take off the plastic cover. The only way to control it is using a piggyback computer or whats also known as a breakout box.
What do *you* think it's doing? Why even try to control VVTi when it can control itself? Is that not the entire purpose of VVT"i"? If you really want to control it, an adjustable cam gear does it. That is essentially all VVTi is. VVTi simply adjusts cam timing to create the best torque band during operation. If you can actually "see" it in action, I applaud you for having such eye-sight There is no need to "control" it unless you're gonna make power out of VVTi's range adjustment (unlikely cause even the 2ZZGE makes power beyond 8000rpms and VVTi keeps up). Do *you* really think controlling when VVTi actuates is gonna increase power? How do you plan on outsmarting Toyota engineering with cam timing? For the most part, VVTi is computer controlled because it is on CONSTANT adjustment for the optimal power/torque. There aren't any gains to be made, in fact, you're gonna lose a lot of torque and response if you're gonna take control of cam timing. The only time you may gain advantages, is when you're building a engine with a purpose... say a high boost engine or high revving horsepower engine. It's NOT like a VTEC controller where you can adjust when Lift occurs... VVTi is a slightly different story, but for the most part, if you want adjustment... get some adjustable cam gears... but that too will only be practical for "belt" driven cams...
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Im not going to argue with you, I know it works becuase Ive used the piggyback system, and in the Vitz series in Japan a lot of the teams use the same system to adjust various functions.
Ok, you guys didnt know what exact purpose there is to controlling Vtec. With a controller you can take advantage of having high power through the entire powerband and make it narrower instead of just at the high rpms. So in track i can get the closer the peak power during low rpms instead of having to keep it at high.
__________________
Team SLIP
2000 Toyota Corolla
suspended liscence.....
Ok, you guys didnt know what exact purpose there is to controlling Vtec. With a controller you can take advantage of having high power through the entire powerband and make it narrower instead of just at the high rpms. So in track i can get the closer the peak power during low rpms instead of having to keep it at high.
No... you don't know what VVTi is. It doesn't do what VTEC does... and lowering the VTEC crossover is not the best way to make more power... nor is manual adjustment of VVTi...
__________________ It's ok to be naked, girl... I'm an Artist!
One point that was missed is that VVT-i on the 1zz only affects the intake cam. You might be able to get some gains from adjustable cam gears on the exhaust cam, especially when combined with a full exhaust upgrade.
Sorry. This just does not add up. There is no way a car with small displacement can make that much power at low revs that it makes at very high revs. At the low end power comes from torque to the wheels, which in turn comes from the displacement and the number of cylinders of the car. If you can get so much power at low revs with so little effort and with such a small engine then it defeats the purpose of the stock settings of power squeezed out from a small engine through hard work at high rpms. Not to mention there will be no differnece between a car with a V6 3.0L getting 180 HP @5000 and a 4 cylinder 1.8 L also getting 180@5000 by using the high lift cam controller, which it would normally get at about 7600 rpm. There would be no need for big engines anymore. What the controller does is that it only alters the point where you want the higher cam lift for exhaust and intakes to kick in. The peak power nevertheless still occurs at high rpms albeit somewhat lower than the stock settings. That's it. Nothing more and nothing less.
Quote:
Originally Posted by TeamSLIPToyota
Ok, you guys didnt know what exact purpose there is to controlling Vtec. With a controller you can take advantage of having high power through the entire powerband and make it narrower instead of just at the high rpms. So in track i can get the closer the peak power during low rpms instead of having to keep it at high.
__________________ SSM 05 Corolla XRS 6 Spd VVTL-i 2ZZ-GE /04 Corolla S 1ZZ-FE (sold)
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There is no need to "control" it unless you're gonna make power out of VVTi's range adjustment (unlikely cause even the 2ZZGE makes power beyond 8000rpms and VVTi keeps up). Do *you* really think controlling when VVTi actuates is gonna increase power? How do you plan on outsmarting Toyota engineering with cam timing? For the most part, VVTi is computer controlled because it is on CONSTANT adjustment for the optimal power/torque. There aren't any gains to be made, in fact, you're gonna lose a lot of torque and response if you're gonna take control of cam timing. The only time you may gain advantages, is when you're building a engine with a purpose... say a high boost engine or high revving horsepower engine. It's NOT like a VTEC controller where you can adjust when Lift occurs... VVTi is a slightly different story, but for the most part, if you want adjustment... get some adjustable cam gears... but that too will only be practical for "belt" driven cams...
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