" Hey guys, here are some dynos from Vargas Stage 1 turbos as installed on my car. Details on these turbos can be provided by Tony. The reason it took this long to get these to you guys is primarily to do with the way the actuators were installed on these units. Tony can explain in more detail but the way I understood it it has to had to do with the way clips that secure the actuator in place were installed. This causes low RPM and WOT onset boost control to be next to impossible to control properly as the actuator doesn't have smooth movement in that area until it gets moving. Sort of gets stuck then goes. I literally had to run not even 10% wgdc during spool up and in the transition to get the turbos to spool to 26psi but given WGDC can't just magically drop boost instantly as it reaches target it causes boost overshoot and huge torque humps, which can be fun to drive at times but certainly can be dangerous at others.
Given these were already on the car I tried my best to still work with them instead of having them taken off to have them adjusted. This same actuator clip issue was on the first set of of stage 2s sent out but all those guys had the benefit of me trying them out before install and they have all been instructed by Tony to swap the clips to the other side of the actuator arm (lucky bastards hehe)
In any case, here's the dynos. I do realize some will attribute gains to my cylinder head work. To be honest I'd love that to be the case. I've asked Tony to also put Stage 1s on another stock motor N54, which he'll be doing soon, and we'll go through tuning it on the same octane. So take them as you wish.
Tuning wise boost down low would be random between 19psi at times all the way to 28psi due to the actuators. Past 5k rpm it'd settle down finally and you can see the curves level off nicely. At 6k rpm boost on this tune is hitting 18.5psi, 17psi at redline. This was done on our local Sunoco pump 94 octane and the Aquamist HFS-4 with two 1.0mm nozzles. Timing is about 16deg through midrange to 24 deg at redline that ramps up past 5500rpm
I've tried a number of things with them including low boost, much higher boost to redline. They could hit 21psi at redline (which wasn't possible on some other turbos I've tested in the past). However, that boost actually caused power to start dropping off earlier towards redline. If anyone's interested in seeing those I can post those up as well as a study into why holding HIGH boost to redline can be counter productive when it comes to making power (even though there are no timing corrections/knock) and there's plenty of fuel/octane. "