I haven't posted much about the car on this forum, so I'll give a little bit of background. My wife Rebecca drives an 06 V6 Manual. We put a Vortech on it about 6 months ago. It has made 350rwhp with a 2.87/13psi pulley and aftercooler. For the past few months it has been running a 3.6" pulley, which makes 7-8psi with the aftercooler. You can't buy it this way from vortech, the aftercooled kit normally comes with a 3.25/9-10psi pulley, and the non aftercooled kit comes with the 3.6 pulley. Besides the larger injectors, the only other mods are a single GT muffler and a GT rear end we recently installed.

I had it on the dyno last week to work on the ETC calibration. I made a few power pulls, and was totally shocked by what I saw. I had a chance to play with my timing curve a little bit more. With the 3.6" pulley I can run MBT all day long, so adding timing does not actually make more power.

http://www.vmptuning.com/dynographs/315rw3.6.jpg

This is with the 3.6 pulley, its finally makes over 8psi with the really nice air we're having. Previously it only made 300rwhp:

http://www.vmptuning.com/dynographs/7psiVS13psi.jpg

15rwhp just from air, wow. I can't wait to put the 2.87 back on it, or even the 2.62 pulley that I just got.

The car currently has single exhaust with a GT muffler. I put a cutout on the exhaust, it is on the drivers side, right before the Y pipe. It effectively gives the car dual exhaust when the cutout is open. No additional power gained when running the 3.6 pulley...hard to believe, but I guess the restriction is elsewhere. The math says a single 2.5" pipe is small for the power level we are at.

 

Would the 2.87 pulley be safe on a car that is daily driven as far as durability of the 4.0 or would you recommend sticking with the 3.25 pulley.

 

We had the 2.87 on it for a while, we'll put it back on at some point soon. The car gets driven around 350 miles per week. The only real hit is gas mileage from spinning the blower harder when cruising down the highway, but we'll see if the bigger BPV helps that.

 

Thanks Justin. I just have to decide exactly what I want to do. Since I am going to have longtubes I know i will doing a vortec now. I will probably just end up doing the aftercooled vortec setup with it's stock pulley and see what I get on the dyno with that and the exhaust setup I will have. If i order a vortec setup thru you guys do you have custom tunes that you would send with it? I already have an sct strategy tuner so I assume i could load your tune on it right?

Thanks
Kerry

 

Thats some great work there Justin.. Squeezing 315RWHP out of 7psi or 7.81 of boost!

They never would have believed me.. LOL!

Keep at it!!

 

Great numbers! Is that on a MD or a Dynojet?

I'm getting a Vortech in about 2 months. Going to keep the stock pully for now, then possibly upgrade it.

 

Dynojet 224xLC

MDs just have too many issues.