GenVibe - Community for Pontiac Vibe Enthusiasts

I just received my new scangauge II, after doing the calibration for fuel, I ran it a few hundred KMs then I discovered the horsepower x-gauge.I ran my car at 154HP @6000rpm on my '05 base automatic Vibe. At first, I was touching myself because I thought this weekend wax was giving me all those new horsies but then I remembered that this car was 130HP and it must be an error. Anyone else had some experience with this tool?

I have a SGII w/Xgauge but never knew there was a HP thing... hmmm. tell me more... did you have to enter anything in to get the x gauge or was it already available?

check this out http://www.scangauge.com/support/horsepower.shtml

sweet, I haven't looked there in quite a while... I'll have to try this and see what happens.Of course the accuracy of this isn't going to be that great, but still fun none the less.

So, how is this supposed to measure HP?? I've got a G-Tech and it uses accelerometers to measure.... You MUST enter the vehicle weight for it to even resemble accuracy... Even then it's not THAT accurate..

You can also calculate the HP with this according to http://www.howstuffworks.com/question622.htm (Torque x Engine speed) / 5,252 = HorsepowerThere's no place to enter the vehicle weight but it asks for the engine size I get 134.801 ft.lbs of torque

...unfortunately, that equation assumes you know the engines' torque value at any given rpm, which typically is not true. Usually, the only two "known" values are: HP@RPM and TORQUE@RPM, and the two RPM-values are different, with RPM-torque usually occuring at about 2/3's of RPM-hp (for 4 cylinder engines)....however, that equation does enable you to calculate the TORQUE at the HP-rpm and conversely the HP at the TORQUE-rpm, then you can roughly "guess-ta-mate" the engine's TORQUE values at any RPM between the two initial RPMs (above) by simply assuming a LINEAR interpolation.For example, the 1.8L 2ZR-FE numbers are 132 hp @ 6000 rpm / 128 lb.ft @ 4400 rpm. So, backsolving we can determine the torque at 6000 rpm and the hp at 4400 rpm:6000 rpm = 132 hp / 116 lb.ft4400 rpm = 107 hp / 128 lb.ft...so, roughly, the torque value falls off about 7.5 lb.ft for every 1000 rpm between 4400 rpm (torque peak) and 6000 rpm (hp peak)....unfortunately, BELOW 4400 rpm, it's a guessing game, because some engines (long-stroke) have gradual torques increase from idle up to the torque peak, others (short-stroke) have a low torque at idle and increase rapidly toward the torque peak. So, without having seen the actual engine-curves for the 2ZR-FE engine, we can only guess that the torque rate-of-rise from idle is roughly the same as its fall-off above the torque peak (remember, we're only guess-ti-mating here), or about -7.5 lb.ft/1000 rpm.