Dramatically improve your SR20VE engine’s turbo response and mid-range torque by adding variable camshaft timing to the intake cam.
The dyno chart shows the real-world results for our SR20VVL/VCT set up. The green line is a run WITHOUT the VCT active, and the red line is WITH the VCT used. On this example, VCT switch points are set to 2000rpm on and 6300rpm off to optimise the power curve. VCT switch points will vary depending on your engine configuration and are best to be determined on the dyno. As you can see in the dyno sheet there is a marked increase in mid-range torque. At 4500rpm torque jumps from 350nm to 480nm!
The biggest gains by far are experienced on the track, coming out of the corners even in rpm ranges below 4500 the turbo wants to spool quickly, where without the VCT you always need to be in the spool RPM for the engine to come alive. This result bridges the gap between 4cyl turbo and the V8’s which is the reason we developed this.
This system has been used on Hans Ruiterman’s S14.5 who went on to win the NZ 2019 / 2020 GT2 championship and we also added VCT to Carl Ruitermans S14 drift car (using a Pulsar GTIR cyl head) back in 2008 where he went on to win 3 back to back NZ Drift championships. This conversion is very well tested.
This is not limited to race cars, it’s also suitable for street engines.
The dyno runs are both done on wastegate pressure (1 bar) using E85 fuel.
There is machining work required to install the front cover and VCT pulley which we can take care of for you, so please contact us for more info. We can also supply datum files to your machinist if getting your cylinder head to us isn’t practical.
A standard SR20DET rocker cover can be used with this conversion cover.