I am curious how accurate the horsepower reading feature is on the scangauge II w/ x-gauge? I'm assuming the reading is hp to the crank, and I notice that it changes through the powerband, but I wanted to know if anyone has used this feature and compared it to their dyno sheets.

If it is accurate...what a great product! you can test mods and get results without going to the dyno.

watching.....been curious myself...

I mean it's hard to read while driving, but I know that I pulled 2nd gear hard and it read 191 but I know I ran the gear out another 600rpm. I was on local roads, so it is hard to test. I'd expect that I am in that range on motor with the work that I have done to it. Maybe later I will find a long on ramp to the interstate and get a passenger to watch it for me.

i sure would like to know if it does works. cuz if it does ill buy one!! but...i still dont see how it would be accurate like a dyno.

It's apparently reading off the ECU or if there is a sensor for the crank. While in neutral at a light is lingers around 4.5hp, slow acceleration in second shows 14hp - 37hp. When laying into 2nd and 3rd gear it tops out around 192hp just before I shift. It updates the hp every half second or so.... so I don't really know how high it hits before I put the clutch in because I gotta watch the road and blink and etc. It was in the 190's at the top of 2nd and 3rd gear.

Other sites with people's reviews seem to say it is accurate. My mods during this playing period are:

MMW 4-2-1 Headers
MMW S-Pipe
Tsudo N1 Midpipe
Strup Exhaust
NST 20% Full pulley set
Injen CAI
Colder Plugs
MMW ETD
ZPI engine stabilizer bar
93 Octane
Optima Red Top

I have always felt like my car was a little quicker when it was stock compared to other stock tc's... not much quicker.... but just a little. I'm not sure what the standard deviation is for cars off the assembly line. 190's to the crank seems pretty close to accurate with these mods. I'm gonna try to find a local guy that has a dyno to the crank and see what this reads in their car to compare....just gotta find the time.

i say it's NOT very accurate....every once and a while it tells me i have like 319hp...haha, i wish! if only a CAI can give me that much power...lol

do you have it setup correctly as far as engine size and etc.

Also, recheck the x-gauge code. My readings have been very consistent and haven't seen any crazy jumps like that. I mean... if I saw it jump to 220hp I would think it was off... because I know that I am not that fast on motor with my mods.

Reviving this thread.... Anyone know or check this with a dyno? Mines peaked at 350 one day at my 8 psi with exhaust and nst pulley.

have you ever went a got dyno tuned ?
You are A/T at 8psi and it shows 350, even at the crank its wy too high for 8 psi on a/t so i say that gauge reads higher.

i'd say its not accurate. alot of that stuff im finding out isnt accurate.... like my mpg being 998? lol about only stuff i've seen acurate is mph, rpm and cai temp ( im guessing voltage is correct but im running 2 batteries so mine shows 14.1 )

It's not accurate at all. Run the test up hill, then run it down hill. Watch as you magically change from 80hp to 250hp.

Goose, the MPG is actually pretty close if it's calibrated and you keep the same driving habits. Mine was usually +/-1 MPG almost every fill up.

The mileage will also say 999 if you're coasting in gear and the fuel cuts out. It would say "infinity" but it can't. But that's what you'd be getting since you can't divide by 0 gallons being used.

The mileage will also say 999 if you're coasting in gear and the fuel cuts out. It would say "infinity" but it can't. But that's what you'd be getting since you can't divide by 0 gallons being used.

http://www.disarm.se/data/bildunttext_nsfw/divide_by_zero1.jpg

oh ok no wonder it would spike lol. my mpg is usually 25 (if alot of city driving) or about 30/32 if mostly highway and closest its came was like 40 or so; i keep resetting the trip section on it, but hadn't had luck on it

Yeah, you need to reset it after every fill up and play with the settings, I forget how to do it all. But once it's calibrated, it'll be pretty close.

I forgot to reset mine a few times, now I never will because it's saying I'm at -430 gallons...

The HP readout, in my experience is just for fun... I'd be thrilled if I actually got 130HP.

I have my ScanGauge2 up to date with the Xcode that does hp. I'm going to the dyno tomorrow, I'll see what kind of difference there is between a real dyno and the computer dyno....

awesome please let us know

Well I have good news....I was at the dyno today and actually video recorded the dyno watching the ScanGauge2, have the results from the dyno and ... yea I think thats it....

Here you go!

In the video the BHP will drop to 0.0 before it starts counting up with the dyno. I just thought about it and I should have set the other gauges to MPH and RPM so we could have had some relativity ... sry :doh:

http://www.youtube.com/watch?v=i7l9WqH_tC8

The final hp recording is 220. Now the question is.. is ScanGauge reporting Crank HP or Brake HP?

I would say on a flat surface, your going to be within reason to your actual horsepower. Now day to day driving I wouldn't say it is going to be totally accurate, uphill, downhill.... etc.

Here is the corresponding dyno sheet
http://scionlife.com/forums/picture.php?albumid=158&pictureid=6593

Aha, I was wondering why the hell the reading was so wack. I have one also, and always wondered why the hp would throw some crazy numbers. I didnt realize that it was calculated when your basically reaching the rev limiter for example doing a 3rd gear dyno run. BTW if anyone is interested in purchasing one I work for stylintrucks.com we sell them and I could get a nice discount, they sell for $160 + 10 shipping I could sell it for $150 with free shipping, if anyone is interested PM me.

Once I get a few more pieces done under the hood and head back to the dyno I'll film it again and make sure I have MPH, RPM and HP on the gauge for a more informational view of how semi accurate it is/isn't.

I really did not get it for that feature, but it is a good idea. From what I heard the best unit to measure horsepower would be the G Tech Pro, which has a built in accelerometer.

For cheesy inaccurate HP measurments sure, GTech, the Dynolicious app, Scangauge...

For your most accurate power readings... is to run the 1/4 mile, weight your car and get your trap time...

FYI it is brake horsepower. Seems to be relatively accurate, once u factor in pulley based losses etc

I make around 205 on the dynojet. ScanGauge 2 shows 226. Factor in the loss of power to friction I'd say it's pretty accurate.

BHP normally stands for Brake Horsepower, meaning crank HP, seems pretty accurate.

BHP normally stands for Brake Horsepower, meaning crank HP, seems pretty accurate.
I was hoping so but my gauge reads 176 when im around 300,so i'm disapointed

I am guessing but it probably calculates the BHP from the fuel consumption which is basic energy output with some RPM thrown in to compensate for torque levels. If your injectors are bigger than it thinks or you run a rich fuel map then you get more HP than it calculates since it doesn't know from the ECU that you have larger injectors but if you calibrate the fuel used at fill up it should be corrected pretty close.