The only change in the cars was the addition of JBA Shorty Headers. The install was very easy and getting it tightened up for no leaks took a while, but it fits nicely.
I used the same tune from the last time, and immediately I was in the 12:20's at almost 113 mph. With some more tweaking of the timing advance to get rid of Knock Reduction up top and be a little more aggressive down low, I was able to set a new personal best:
Sixty: 1.653
330: 5.021
1/8: 7.799 @ 88.66
1/4: 12.191 @ 112.89
The sixty-foot is amazing for a bolt-on car, and the time is great. It means I'm just two-tenths from an eleven-second run, which is very doable with my next mod, 3.45 gears in the rear. I'm just swapping out the differential from a manual Camaro that has 3.45 gears for my automatic differential that has 3.27 gears.
Here's a simple in-car video.
Interestingly, I used an App called "Dynolicious" for my IPhone on that run, and it was very accurate on the timing.
The horsepower is just a calculation using weight (4000 lbs) and drivetrain loss (15%). But more interesting is the horsepower that each change has gained. I put together a simple spreadsheet:
So that's a gain of almost 90 base horsepower since my first run, and the individual runs are very interesting.
Shows you what a few simple bolt-ons can do!
Oh, and I decided to name the car "The Heretic", because the Conventional Wisdom in the hot-rodding world is that Shorty Headers and Midpipes don't gain you much power. Everyone says you must get Long Tube Headers for good power. Well, the numbers are there, I gained 43.14 base horsepower. Since I'm going against that "Gospel", guess that makes me a Heretic. :-)
No comments:
Post a Comment