ADJUSTABLE VERNIER PULLEYS for F4R

[en035]

k-tec recently released these

http://www.k-tecracing.com/show_product.asp?id=2374

I was wondering whether these would make any difference with standart cams on F4R. Is the cam timing optimum as the factory default setting or is there still somemore can be done?

 

[big hp]

I was told (when having a remap on my F7R williams lump) a set of verniers would see gains on standard cams. Not sure how much but he definately thought it was worth a try. This was from a very well respected tuner by the way.


Not sure about F4R. Same principle though i'd have thought.

 

[ditz]

they arent really needed the cams on them arent keyed anyway so you could by rights set the cams up with a dti

 

[BenR]

Those are cat cam veniers, heavy duty and strong, but dont always spin 100% true, i always check every set i fit.

If you run those verniers you loose VVT, so only for extreem applications really.

 

[agil]

Hi Ben, VVT is Variable Valve Timming Right?

Do You know how it works and the symptoms in case of bad function?

Is controlled by this solenoid?

Regards

 

[BenR]

Variable valve timing yes.

It works off oil pressure through the cam centre itself as its hollow, the solenoid you have pictured is correct, and that is tripped by a ground by the ECU when VVT should be triggered. Oil pressure acts on the vanes inside the pulley to push the centre unit attached to the camshaft in advance of 16 degrees.

VVT pulleys can fail, but i've not seen one fail yet.

 

[agil]

Thanks Ben

I ask becouse my car sometimes the engine at idle speed is not stable and in the exaust backbox (silencer) you heard tut.. tut tut tut tut and a friend told me you have to clean the VVT Solenoid is getting stocked and engine is loosing the timming so I do not know

Regards

 

[BenR]

They all idle a teeny bit rough, so there is fine line which is hard to describe over the net.

 

[agil]

Thanks BenR