VVT use with Turbo??

[lorolla24]

Hi,

Just seen those cam pulleys JIMTUNE is selling and it made me think.

I have my 20v silvertop turbo going good but without VVT as i am using the LINK to control boost.

SO, i am wondering what others have experienced with VVT turbo setups?

I can change my setup to use a set boost tap to 15psi and then configure the LINK to turn ON and OFF then VVT.

OR buy the adjustable cam pulleys and get rid of the heavy inlet pulley and fix the timing.

Any comments??

Thanks.

[strx7]

if an engine has any form of variable cam timing at all, you are loosing torque spread by not using it, end of story.

[lorolla24]

So, I should use it? even its just a little bit?

[Adamal]

I'd say you'd be loosing efficiencey by not having it, so could be a good idea. Maybe install a switch so you can switch between to see the difference.

[matt dunn]

Big difference in having it working and not.

Standard cams need the VVT to get decent power,
so cant really run aftermarket pulleys on them and keep the power and efficency.

[Bazda]

I did a back to back comparison with mine.
VVT def makes up alot down low.

Something like 30-40kw+ atw from 2000rpm-5000rpm. And also the same gain in torque.

[Paulio]

Again, definitly keep the vvt.

[mr30%jr]

talk to acesniper about cams and what not. with VVT but then again hes n/a but still... n/a rules still apply in a forced induction setup. he does not use VVT and check the toyspeed dyno records

[Bazda]

He does not use VVT as he has massive cams which dont cater for VVT.

If you have stock cams use the VVT to your advantage!

[mr30%jr]

He does not use VVT as he has massive cams which dont cater for VVT.

If you have stock cams use the VVT to your advantage!

agree

a simple rev switch kit from jaycar could help?

[lorolla24]

cool, will definitely change my setup when the engine goes back in.
I am using standard cams.

I have a Link V5 so i will change the boost control output to RPM control so i can turn ON and Off at certain Rpm.

Might start with about 1500 to 4500rpm ON stage.

An extra 20kw would be great and set me over the 200kw mark. Sweet.
Its going into my SR.

[1I1]

May not get you to 200kw at wheels by running VVT - it'll just make it better mid range

I did a back to back comparison with mine.
VVT def makes up alot down low.

Something like 30-40kw+ atw from 2000rpm-5000rpm. And also the same gain in torque.

[lorolla24]

If not i will go with plan B and put my larger injectors in and add a few pounds of boost.

Every little bit helps tho.

More low down torque would be good.It had a bit of a power band feel to it without the VVT running.

[Bazda]

Makes the low to mid range ALOT better.

I found turning mine on at 2000rpm and off at 6000rpm was the best combo with the turbo.

I have the dyno graphs using 8psi of boost. The final power decrease was from elevated intake temps as we relocated the fan from the IC onto the manifolds as they were getting pretty hot.

[1I1]

Wow that is a big difference!! Definately worth while running vvt then!

[strx7]

unless you are running big cams and Very high compression, or massive cams in which case you running into interferance issues, you will ALWAYS gain low & mid range talk by being able to alter the cam timing.

Inlet cam closing timing, has more bearing on torque delivery & what rpm peak torque is achieved at than anything else you can alter on your engine.

[kramer2202]

iv got a link g1 which is going to run a N/A black top and 270 degree inlet cam and standard vvt cam gear when i go to get it tuned will i b able to make vvt come on between any rpm ,eg 2500-6500?

[AceSniper]

using vvt and aftermarket cams wont net the gains the cams were designed for as they are made for different timing to sdt.

For vvt control just get some form of rpm switch, and leave the link controlling the boost.

[xsspeed]

using vvt and aftermarket cams wont net the gains the cams were designed for as they are made for different timing to sdt.

Can you elaborate more on this?

I am assuming that their comes a point where the are interference issues with the cams + vvt. any idea whats the most agressive cam that can be run with vvt?

bit of a noob when it comes to cam details.

[groupagt4]

i still use vvt on my silvertop. could post up a dyno graph if you want