||01-26-2011 02:22 PM
Originally Posted by jgorm
You missed that pumping up the tires from 25-55psi made 4hp. I won't get too deep into statistics, but when you looks at the 3SD values you can see that 3hp is nothing when you are + 5.5hp. For the other statistical gurus, you will notice that a N of 3-5 will mean that the power analysis will be very low on my accuracy of the SD, but its probably in the neighborhood.
The highest stock hp was 142.12 and the lowest was 139.56. With no horn the best was 143.42 and the worst was 140.94 so its safe to say that did nothing significant. The best HP with pumped up tires was 147.59 and the worst was 145.99 so that is slightly significant and should be used as the baseline for all future tests because the tires remained pumped up. The best intake was 151.66 but the worst was 147.24. So when you compare 147.59 from the best tire pressure to 147.24 with the worst intake pull you can say that there is no statistical change.
I didn't miss the tire inflation runs.
Looking at your run comments:
- Pulls 1-5 were done on the stock intake setup
- Pulls 6-8 were done after removing the stock "horn" on the airbox
- Pulls 9-12 were done after increasing the tire pressure from 25psi to 55 psi. This was done to try to minimize the wavy torque curves.
- Pulls 13-14 were done with no intake at all, just an open throttle body with the IAT sensor duct taped 2" above it.
- Pulls 15-18 were done with the aftermarket intake.
it appears that you only had the tires "pumped" for runs 9-12 which means that the pull 1-5 and pulls 15-18 were done with stock pressures and that is where the 9hp differential came from which is only one from the advertised claim.
My point was, your test has several variables that are not qualified yet you "call BS" on someone's claim on what seems to be 1hp.
Put another way, if YOU were selling the CAI and ran a dyno with STOCK and your CAI and showed a 9hp delta, that is what you would advertise, never mind that, somewhere in the middle of the test you bumped up tire pressure.
That is why I asked the question on type variance of dynos and parameters of your test vs that of the original vendor and their claims.
We moved from a dynojet type of dyno [like Mustang] years ago because they introduce too many variables and went with a dynapack type unit. It keeps the variables to a minimum. Of course it still doesn't answer the question of what type dyno the vendor was using.