Hey there guys, we in WA today had a club dyno event, was a great day :D Now there is some things im hoping people on here could explain and maybe offer some advice on regarding my dyno sheet and power output.

Here is my dyno sheet:

http://i376.photobucket.com/albums/oo202/timcollings/DynoRun1.jpg

First up given i have a TJ 01 VRX manual with, PM extractors, magnaflow muffler and K&N panel is that an "expected" power output? I only ask this as another TJ 01 VRX manual got 181hp and it has a cannon muffler, exposed K&N pod and Brisk LGS SparkPlugs DOR14LGS-T. I would have thought i would have at least matched it, and a TW auto non VRX with K&N panel and highflow muffler got slightly higher than mine :S

Also at about 116kph the power curve drops slightly, the owner of the business couldnt explain why my car would do that, was hoping someone could please explain why it would do that, and whether or not i should get it looked into?

Cheers
Timmy

TBH the ramp rate seems a little high an average is around 13, and also the sudden drop @ 116kph seems strange and not something you would want, if it was me i would be taking the car and getting it re dynoed.

171hp = 128kw which seems about right for the mods you've done. Not every Magna is going to put out a power figure the same as your's, even if it has the same or similar mods as you. No two engines will be same and even if they were they could react differently to different mods.

The other car's AFRs for example could be different to yours meaning a different power reading. Also, the power reading is the maximum at a particular spot in the rev range. The other guys car might have a higher maximum power reading but your's could be more powerful on part throttle throughout the rev range, for example.

Don't look too much into power readings they mean diddly squat. I would be more interested in the power curve and AFRs than maximum power reading at a high rev point which you won't be driving at all the time anyway.

And from what i've seen dyno operators usually set a higher ramp rate to get higher power readings.

http://www.aussiemagna.com/forums/showthread.php?t=64197&highlight=dyno

http://www.aussiemagna.com/forums/showthread.php?t=64197&highlight=dyno

Yeh i know about that thread, but as i was asking for some advice and information i wasnt going to ruin that thread with posts only relevant to my situation.

I was moreso posting the link so you could campare your car to some others on here, also because people have their printouts you are able to look at the ramp rates and air fuel ratios.

I was moreso posting the link so you could campare your car to some others on here, also because people have their printouts you are able to look at the ramp rates and air fuel ratios.

Ahhh thanks then yeh searched but am trying to find out why my power curve dropped slighty, rather than the peak power as i understand each car is unique

Not sure on your RPM at the dip at 116kph but its around peak torque, might have been alittle wheel spin, pretty come with the FWD usually have to warm the tyres up a bit before you give'em a power run.
Don't get to stressed about the numbers those shoot out days can the worst, not that consistent per entry. Remember the dyno is really for tuning and that it does a excellent job.

Cheers Dave.

like mohit said each engine is different, as you see more and more dyno printouts a/f ratios can drop down to 10's or stay flat around 12's which give a higher output as they run a little leaner.

i tink with a retune you could fix your air fuel ration, nothing to worry about to much i dont think....im not sure about that dip as 2 or 3 of you guys had it, and you all have similar mods...

As already mentioned, a ramp rate of 15 is IMO just too high for a stockish magna...it tends to give a higher figure and abnormally smooth power curve, as the car isn't being loaded up properly. Ideally you use a ramp rate in the 9-11 range, though 13 is what 'shootout mode' defaults to so it's often accepted as ok, depending on who you talk to.

If you ever see a graph from a run done with a nice low ramp rate you'll see the curve is much less smooth..instead one it being a very smooth curves there's small fluctuations all over the place.

You seem to have another seemingly somewhat rare example of a magna with unusually good mixtures for a factory tune. I wonder though if that's cos there's insufficent load...perhaps with a lower ramp rate the mixtures would be different?

Be very interested to the result if someone tests this...if you do another run sometime with the stock tune perhaps request a lower ramp rate and see if the AFR curve is still the same.