Vvti Timers

[AdamT]

Is there such a product out there that alows you to change the point of RPM where the VVTI effect takes place?

Eg, as you would with a VTec timer??

What I'm trying to say is, is it possible to lower the point of RPM where the 2nd fuel rail kicks in? - (Forgive me if thats not technically correct :duh: )

[ColinBarber]

vvt-i takes effect throughout the rev range. It's not and on or off thing like v-tec.

[AdamT]

vvt-i takes effect throughout the rev range. It's not and on or off thing like v-tec.

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So its a constant process, so the 4k increase can not be moved further down the rev range?

[ColinBarber]

The 4K increase has nothing to do with vvt-i. That is the ACIS shortening the air intake and also the engine going into 'performance' mode by altering timing and fueling.

You could probably make the ACIS open at a different rpm but what that would do to performance on it's own is probably quite small.

To alter the timing would require the engine ECU to be re-programmed, not something that is possible on the IS. So you would need a piggyback or seperate ECU to control that. This would be quite complex.

[AdamT]

Sounds like you know your stuff.

Thanks for your help!

[Wosket]

Sounds like you know your stuff.

Thanks for your help!

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colin's da man!

[Lexus_Athens]

VVTI has to do with Cam profile. Variable Valve timing with Inteligence.

Trying to alter will require serious reprograming skills.

Also I doubt if the results versus the cost would be satisfactory.

[tdiplc]

We were the first in the UK to install and tune the HKS Valcon system which allows adjustment and tuning of the VVTi version of the 2JZ GTE engine.

The Valcon system comes with a special camshaft and a controller which allows VVT adjustment against throttle angle, RPM and airflow.

A VVT Supra we did last week showed a gain of 30Nm at 3000rpm which we were impressed with, so it may be worth trying on the is200 (but it is an expensive system).

[AdamT]

How expensive

Would the bhp increase be dependent on other modifications?

What would your estimated increase be to a standard UK IS200?

Thanks

[tdiplc]

How expensive 

Would the bhp increase be dependent on other modifications?

What would your estimated increase be to a standard UK IS200?

Thanks

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Unfortunately I don't know the answer to either question as we have not done it before, and as far as I know no-one else has either.

Normally some-one says "I want it" then it gets made.

[Johan]

How expensive 

Would the bhp increase be dependent on other modifications?

What would your estimated increase be to a standard UK IS200?

Thanks

←

Unfortunately I don't know the answer to either question as we have not done it before, and as far as I know no-one else has either.

Normally some-one says "I want it" then it gets made.

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Does anyone here know if there are any cam upgrades for the 1F-GE and 2JZ-GE motors? So far I've only seen 1J- and 2JZ-GTE-compatible stuff of this kind.