i finally put in my aeroforce yesterday that i have had since christmas and i decided to test the horsepower of my car

i have a stage 2
injen cai
cti race header and downpipe
ngk bkr7e plugs
and corsa touring exaust

i am running very rich and i know im detuned as hell and i was guessing about 260 to the wheels but the interceptor gave me a around a 253 hp reading 3 times in a row

i was just wondering how accurate it is

 

use the search button genious!! there has already been 3 threads about this same topic today!! its not very accurate cause it doesn;\'t factor in alot of stuff like wheel spin and ****

 

I believe he's talking about horsepower, not the 1/4 mile times.

I'm pretty sure it calculates horsepower based on incoming airflow measured by your Mass Airflow Sensor. If its not calibrated 100% correct (and they usually are not, hence the p0171 dtc you get when you change the intake pipe) then the number MAY be off. It all depends on if the interceptor applies the change calculated by the oxygen sensor (known as a long term fuel trim). Also if you change pulley sizes from the stocker, I'm pretty sure it won't calculate the added parasitic loss created by having to turn the blower faster, it only sees the extra incoming airflow.

 

only 1 way to tell.......go get it dynod

 

read the manual, +/- means more or less which means not accurate which means dont bother using it. i actually contacted them and they said it can be off 20hp so.

 

Get rid of the colder plugs. Go back to the stock plugs gapped at .040. I'll guarantee it shows higher hp.

 

you also need to make sure your altitude setting and hp adjustment settings are accurate, i have a stage 2 and catback on now with my lighter winter rims and it said i had as high as 290hp at redline with the super cool winter air..it may be a bit high but definatly not by 20hp, its also the engine hp not at the wheels

 

the number itself doesnt mean much, but what CAN be very useful, is how that number changes when you do mods.

just like a dyno, the numbers only become relative when compared to themselves.

so if its reading 253, and you add an exhaust, and it shows 264, that becomes far more relevant

 

Go get the car dyno'd. Take the HP from the dyno. (mine was 219 on a mustang dyno so it simulates road conditions) Make sure the guage is reading 100% and go do a few pulls to 7000 rpm. Take the average of your pulls. (say they came to 290 HP on the street reading from the Interceptor) Take the 219/290=.76%. Minus 24% from you interceptor 100% and enter that correction factor into your interceptor. Inter in your elevation and you should now have a rough estimat of your WHP.

HORSEPOWER ADJUSTMENT. This choice allows you to enter a
correction factor for the horsepower parameter and the MPG parameter.
This one correction factor applies to both. These parameters are available on
those cars using a factory Mass Air Flow sensor. Net horsepower and fuel
mileage can be closely calculated by knowing the mass air flow value.
However, since each car is slightly different in efficiency, this calculation can
be adjusted if the exact peak hp is known after being run on a dyno, or the
MPG reading needs adjustment. For example, if the gauge indicates 300 hp,
and the net hp (not rear wheel hp) is determined to be 315, you can enter a
correction factor of 1.05 (adding 5%). This is done by selecting this menu
option, and entering this factor. There is no decimal shown, so you will be
entering this value as a three digit number. For example, 1.05 will be entered
as 105, 0.95 will be entered as 095 (subtracting 5%). Likewise, if fuel
mileage reading is known to be off by 5%, say the gauge is reading 5% low,
enter a correction the same way (105). As with the shift light entry field, you
will use the left button to change the digit above the cursor. Hitting the right
button will move the cursor to the next digit. After the last digit is entered
you will return to the main menu. The factory default value is 100,
representing 1.00, or no correction factor. Also, if the MAF sensor has been
recalibrated or replaced with one sized differently, this correction factor can
be used to compensate for this change. For example, if the original MAF is
rated at 60lb/min, and the new one is 100 lb/min, find the increase in size by
dividing 100 by 60 = 1.6667. This number, entered as 16667, would be the
correction factor you’d add here. It doesn’t matter how the sensor is rated,
kg/hr, grams/sec, etc., the same method is used.

m) Altitude. Enter your altitude (elevation) in feet as a 4 digit number. For
example, 700’ above sea level would be entered as 0700, 2500’ would be
entered as 2500. This entry is used in some of the calculations to improve
their accuracy. Not all gauges will have this option, some vehicles have a
barometric pressure sensor that automatically performs this function.