I didn't think I would get to do this until Saturday morning but I ended up getting it done this afternoon.
Just as a recap, I've used my GPS box to test my o/r h pipe, tune and k&n filter previously so this isn't a new procedure to me. My 93 Tune came in at 18-20 hp, the o/r h pipe was 14-16 hp, and a k&n filter was 0 hp.
The resolution of the GPS box makes it able to measure 5hp differentials, so if something is making less than that it could be hard to notice it but, anything making 15+ hp will easily be measured using this GPS box.
I was going to post graphs of each run (3 with and 3 without the JLT) but the graphs really don't provide any information that can't be provided by just listing the pertinent numbers for each run. If anyone would like to see the graphs (speed vs time also showing altitude) I can do that.
How the test was performed:
The test is very straight forward, I use 3rd gear (gear doesn't matter for anything other than having the best mph range that is easy on streets) and did pulls from 15 mph - 85 mph. This speed range takes me from around 1,500 rpm up to almost redline. Since I'm not looking for an absolute horsepower the gearing isn't important, plus the real world has friction and wind resistance etc that is going to really do a number to the reported hp so again absolute number isn't important, only the differential.
These pulls obviously wont experience traction problems and there isn't any shifting so driver variability isn't going to be a factor. The DA was observed for the JLT runs as well as the Stock Box runs (about 1 hr separated the runs) as well as any altitude change during the runs. The runs were made in the same corresponding locations but you still have to account for any elevation changes since that adds potential energy into the equation. I did my best to start the runs at the same locations but in reality it doesn't matter, all that needs to be accounted for is altitude variation and potential energy.
If you know the change in kinetic energy and the time for that change to occur you can calculate power, simple kinematics.
So here are the results!!!!
The JLT runs were done with a DA of 1231.
JLT run 1 was 180.70 hp
JLT run 2 was 181.97 hp
JLT run 3 was 184.04 hp
The standard deviation was 1.68 hp.
The Stock box runs were done with a DA of 942.
Box run 1 was 180.25 hp
Box run 2 was 183.30 hp
Box run 3 was 186.04 hp
The standard deviation was 2.87 hp.
After using the DA of the different runs and normalizing the power output the results were:
JLT average normalized hp = 180.42 hp
Stock box average normalized hp = 179.95 hp
The conclusions I draw from the results are fairly self explanatory, there doesn't appear to be any difference between a stock air box and a JLT intake. As far as tune I was running, my stock box tune was an email tune and my JLT tune was an email tune from the same tuner.
If anyone has questions about how these numbers were calculated more specifically I can scan in my scratch paper were I did all the math.
I'd like to thank WBT for shipping this to me. I haven't bought a CAI because I seriously doubted they would make anywhere close to the claimed power and the chance to test this without it costing me any more than shipping the JLT back to WBT was too much to pass up.
I didn't expect any performance gains and this pretty much confirms that. Supposedly I should have noticed just as much of a difference with the JLT as I did with my o/r h pipe and well.... that wasn't even close to the case.
Just as a recap, I've used my GPS box to test my o/r h pipe, tune and k&n filter previously so this isn't a new procedure to me. My 93 Tune came in at 18-20 hp, the o/r h pipe was 14-16 hp, and a k&n filter was 0 hp.
The resolution of the GPS box makes it able to measure 5hp differentials, so if something is making less than that it could be hard to notice it but, anything making 15+ hp will easily be measured using this GPS box.
I was going to post graphs of each run (3 with and 3 without the JLT) but the graphs really don't provide any information that can't be provided by just listing the pertinent numbers for each run. If anyone would like to see the graphs (speed vs time also showing altitude) I can do that.
How the test was performed:
The test is very straight forward, I use 3rd gear (gear doesn't matter for anything other than having the best mph range that is easy on streets) and did pulls from 15 mph - 85 mph. This speed range takes me from around 1,500 rpm up to almost redline. Since I'm not looking for an absolute horsepower the gearing isn't important, plus the real world has friction and wind resistance etc that is going to really do a number to the reported hp so again absolute number isn't important, only the differential.
These pulls obviously wont experience traction problems and there isn't any shifting so driver variability isn't going to be a factor. The DA was observed for the JLT runs as well as the Stock Box runs (about 1 hr separated the runs) as well as any altitude change during the runs. The runs were made in the same corresponding locations but you still have to account for any elevation changes since that adds potential energy into the equation. I did my best to start the runs at the same locations but in reality it doesn't matter, all that needs to be accounted for is altitude variation and potential energy.
If you know the change in kinetic energy and the time for that change to occur you can calculate power, simple kinematics.
So here are the results!!!!
The JLT runs were done with a DA of 1231.
JLT run 1 was 180.70 hp
JLT run 2 was 181.97 hp
JLT run 3 was 184.04 hp
The standard deviation was 1.68 hp.
The Stock box runs were done with a DA of 942.
Box run 1 was 180.25 hp
Box run 2 was 183.30 hp
Box run 3 was 186.04 hp
The standard deviation was 2.87 hp.
After using the DA of the different runs and normalizing the power output the results were:
JLT average normalized hp = 180.42 hp
Stock box average normalized hp = 179.95 hp
The conclusions I draw from the results are fairly self explanatory, there doesn't appear to be any difference between a stock air box and a JLT intake. As far as tune I was running, my stock box tune was an email tune and my JLT tune was an email tune from the same tuner.
If anyone has questions about how these numbers were calculated more specifically I can scan in my scratch paper were I did all the math.
I'd like to thank WBT for shipping this to me. I haven't bought a CAI because I seriously doubted they would make anywhere close to the claimed power and the chance to test this without it costing me any more than shipping the JLT back to WBT was too much to pass up.
I didn't expect any performance gains and this pretty much confirms that. Supposedly I should have noticed just as much of a difference with the JLT as I did with my o/r h pipe and well.... that wasn't even close to the case.
op:
