Vvtl-i Controler

[ckapodistrias]

I recently bought the TS Corolla 2004 model.

The lift engages on 6200 rpm. Can this be changed? lets say to 6000 rpm?

[Nick-Johnson]

It just would not work for starters if it could be adjusted your LIFT zone kick would be no were near at pronounced due to the lack of torque from the engine.

If you want more power go for a new exhaust and manifold or even a CAI (could air intake).

[Astakos]

...or a parallel APEXi or Greddy ECU!!

[Rolla nutter]

Used to have a fully modified civic 1.6vti, similar sort of variable valve timing and the previous owner had installed a valve controller and there is a switch underneath the steering wheel where you have adjust the timing of the LIFT zone from 5,500rpm to 1,100 or higher. Great fun!!!

BUT I was told the best lift zone remains 5,500 rpm...

[ckapodistrias]

Thank you all for your imidiate response.

I would like to ask Astakos, are you by any chance related to a well known greek Toyota dealer?

I believe that this pic you have, you took it using your mobile.

Your corolla (if it is you) is a beauty!!!

Do you believe that the apex-i will do the job?!

[eavp]

apexi sounds like a good option

how ever I think c-one would be the best option

[ckapodistrias]

c-one?

what is that? i never heard that before...

[Astakos]

I would like to ask Astakos, are you by any chance related to a well known greek Toyota dealer?

I believe that this pic you have, you took it using your mobile.

Your corolla (if it is you) is a beauty!!!

Do you believe that the apex-i will do the job?!

Which greek Toyota dealer do u mean?

Where have you seen my car???

According to BARBARIS (greek toyota specialist) the APEXi parallel ECU will give you an extra 6-8 bhp but it cannot change the lift zone. The Greddy ECU will boost another 4 bhp to your car, yet it cannot alter the lift zone!

But bear in mind that with the installation of either of the above mentioned ECUs you kiss your quarantee goodbye!! :(

[Fidgits]

right, heres the deal.

Honda use a software designated controller for their VTEC system, whereas the VVTi and VVTli systems from Toyota, dont actually have a 'switch' point, it is a constantly variable valve timing, and the 'burst' of power you feel is just the point the torque curve becomes most pronounced..

So, the short answer is, no, you cannot buy a VTEC controller type device for the VVti engine... but there are some mods you can do to improve the performance..

[ckapodistrias]

I know Astakos...

this is the good thing and the same time a bad thing with toyota.

I wouldnt do anything that would alter the manufacturer guarantee.

I was just being curious. Maybe so mods will be done on the future.

for your question about the dealer, i meant "Toyota Gianitsas"

but anyway, i guess i was wrong...

Thanx for the info!

as for Fidgits, i thought that there is a switching point on VVTL-i engines. It is on 6200 rpm where a small piece of metal slides between the cams and the valves that alters the lift. So if that is the case, the ECU takse control of that function.

Am i right?

[Nick-Johnson]

I know Astakos...

this is the good thing and the same time a bad thing with toyota.

I wouldnt do anything that would alter the manufacturer guarantee.

I was just being curious. Maybe so mods will be done on the future.

for your question about the dealer, i meant "Toyota Gianitsas"

but anyway, i guess i was wrong...

Thanx for the info!

as for Fidgits, i thought that there is a switching point on VVTL-i engines. It is on 6200 rpm where a small piece of metal slides between the cams and the valves that alters the lift. So if that is the case, the ECU takse control of that function.

Am i right?

Toyota’s 1.8 2G-ZZ engine is a little different to the rest of the engines the company currently manufacture, firstly the majority of the design work for this engine is down to Yamaha hence the name stamped on the side of the engine block if you look closely were others are solely Toyota.

Now as the majority of you know this engine produces its peak power over 6200RPM with the help of variable “LIFT” (That why this power zone is referred as LIFT) on both intake and exhaust. This power unit has two camshafts one that is used between 0 & 6200RPM and the other a High Lift cam that is used from 6200 RPM all the way to the engines red line of 8250RPM.

A pressure valve determines the use of the high lift cam so when enough pressure has built up it moves an internal metal pin to switch itself over to the other camshaft. This has been set for the optimum performance, now if the pin could be moved at 5200RPM and the high lift cam came in 1000 revs earlier due to the lack of torque this zone would be nowhere near as pronounced therefore crippling the engine performance.

The “LIFT” zone is purely mechanical there is no way of activating this any earlier by plugging anything into the cars ECU.

Here the diagram for those that are interested:

Diagram 2G-ZZ 1.8 VVTL-i

Hope this clears it all up.

Nick

[ckapodistrias]

... i got it...

thanx for the info!!!!

chris

[RedAE102]

The ECU controls when the hydraulic pressure moves the sliding pin into place, thus forcing the engine to follow the higher lift/longer duration cam lobes. I have no idea how to make an aftermarket ECU do this, but I've read that it does it in much the same fashion as Honda's DOHC VTEC systems... Where there's a will, there's a way.