Just wrapped up installing Beefcake’s torque booster setup with the Tial wastegate and 3.33 pulley and thought I would provide some data. I am bad about checking up on posts on these sites, so I will try to include all of the relevant info in this post.
This is all based on the Beefcake special as a starting point. I also modified my previous Airaid CAI to work with the Paxton inlet tube. First, I should note that I was not starting off with the stock pulley. I had already dropped down to the 3.47 pulley to be able to get to 9.7 lbs of boost up here in Denver. We have to drop down further than most of you because of the lack of air up here. So, I have three runs to compare for you: 3.6 pulley (the first one I installed with the kit), 3.47 pulley with long tubes (installed at same time), and 3.33 pulley with wastegate. The dyno’s correction factors for all three runs are pretty similar (1.25, 1.24, and 1.23 respectively).
At 6,000 rpm’s, here's the difference:
3.6: 5.64 lbs boost, 578.45 rwhp, 506.44 ft-lbs torque
3.47: 6.79 lbs boost, 673.47 rwhp, 587.24 ft-lbs torque
3.33: 7.31 lbs boost, 694.43 rwhp, 598.96 ft-lbs torque
Peak numbers:
3.6: 7.82 lbs boost, 686.62 rwhp, 508.68 ft-lbs torque
3.47: 9.77 lbs boost, 806.83 rwhp, 589.77 ft-lbs torque
3.33: 9.27 lbs boost, 748.8 rwhp, 601.93 ft-lbs torque
The torque booster setup produced almost 100 rwhp and 92 more lb/ft of torque over the 3.6 pulley in the 5-6,000 rpm range. It only produced a little bit more rwhp and torque than the 3.47 pulley in the midrange, but we were able to pull almost 6 degrees of timing back out of it to produce those numbers.
The torque booster isn’t showing huge gains on the chart over a 3.47, but it allows me to run a lot less timing and provides a much safer curve should I drive the car at lower altitudes. The wastegate will blow off the excess boost, and the lower timing should keep me in a safer range than I was running with the 3.47.
The verdict: I am extremely happy with the results. My goal was to pick up a little bit in the mid-range, where I actually like to drive and shift the car. If you are looking for huge top end horsepower numbers then go with a little bit larger pulley and throw a ton of timing at it. If you have a 3.6 pulley (or especially the stock 3.8 on the Paxton), then skip the 3.47 and go straight to this setup.
*For those of you who aren’t used to seeing horsepower numbers at altitude, the 806.83 run was only 650.2 uncorrected – probably right at the max you would want to run on stock internals, if not a little above. I plan to swap out the motor for a built bottom end over the winter and play with some smaller pulleys in the spring. Should be fun with the wastegate!
Thanks to Beefcake for the setup and Rob Williams at RWR Motorsports for the tune. The car feels better and crisper than ever before.
This is all based on the Beefcake special as a starting point. I also modified my previous Airaid CAI to work with the Paxton inlet tube. First, I should note that I was not starting off with the stock pulley. I had already dropped down to the 3.47 pulley to be able to get to 9.7 lbs of boost up here in Denver. We have to drop down further than most of you because of the lack of air up here. So, I have three runs to compare for you: 3.6 pulley (the first one I installed with the kit), 3.47 pulley with long tubes (installed at same time), and 3.33 pulley with wastegate. The dyno’s correction factors for all three runs are pretty similar (1.25, 1.24, and 1.23 respectively).
At 6,000 rpm’s, here's the difference:
3.6: 5.64 lbs boost, 578.45 rwhp, 506.44 ft-lbs torque
3.47: 6.79 lbs boost, 673.47 rwhp, 587.24 ft-lbs torque
3.33: 7.31 lbs boost, 694.43 rwhp, 598.96 ft-lbs torque
Peak numbers:
3.6: 7.82 lbs boost, 686.62 rwhp, 508.68 ft-lbs torque
3.47: 9.77 lbs boost, 806.83 rwhp, 589.77 ft-lbs torque
3.33: 9.27 lbs boost, 748.8 rwhp, 601.93 ft-lbs torque
The torque booster setup produced almost 100 rwhp and 92 more lb/ft of torque over the 3.6 pulley in the 5-6,000 rpm range. It only produced a little bit more rwhp and torque than the 3.47 pulley in the midrange, but we were able to pull almost 6 degrees of timing back out of it to produce those numbers.
The torque booster isn’t showing huge gains on the chart over a 3.47, but it allows me to run a lot less timing and provides a much safer curve should I drive the car at lower altitudes. The wastegate will blow off the excess boost, and the lower timing should keep me in a safer range than I was running with the 3.47.
The verdict: I am extremely happy with the results. My goal was to pick up a little bit in the mid-range, where I actually like to drive and shift the car. If you are looking for huge top end horsepower numbers then go with a little bit larger pulley and throw a ton of timing at it. If you have a 3.6 pulley (or especially the stock 3.8 on the Paxton), then skip the 3.47 and go straight to this setup.
*For those of you who aren’t used to seeing horsepower numbers at altitude, the 806.83 run was only 650.2 uncorrected – probably right at the max you would want to run on stock internals, if not a little above. I plan to swap out the motor for a built bottom end over the winter and play with some smaller pulleys in the spring. Should be fun with the wastegate!
Thanks to Beefcake for the setup and Rob Williams at RWR Motorsports for the tune. The car feels better and crisper than ever before.
