Noob Dyno question - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

bdanisi · 02-04-2013, 05:25 PM

This can prolly be answered in 2 seconds, googled it but im not exactly sure what to even call it so feel free to say im an idiot or say let me google that for you.
What does a break in the line of a dyno test mean? I was looking at some dynos on the forum and in the HP line there were spots where the lines would break and then continue. Does that mean the computer didnt record for a few seconds or ...?
thanks

Boosted2.0 · 02-04-2013, 05:26 PM

That generally means that the inductive pickup for the engine RPM sense went away for some reason - either it was loose, there was electrical noise on the line, or something similar.

The computer was likely recording, and if you take the torque curve off the plot it will probably show you an unbroken HP curve.

King Tut · 02-04-2013, 05:43 PM

Yep. It is farily common on the newer digital igntions where you don't have a nice big plug wire to put the pickup on. Some dyno shops won't even give you RPM if they can't find it, so it is always best to know what kind of pickup is needed and where the dyno operator should place it before making the trip.

02-04-2013, 05:25 PM	#1
bdanisi You Made Bro? Join Date: Dec 2012 Drives: Raven 86 Location: Laguna Niguel Posts: 520 Thanks: 134 Thanked 241 Times in 112 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Noob Dyno question This can prolly be answered in 2 seconds, googled it but im not exactly sure what to even call it so feel free to say im an idiot or say let me google that for you. What does a break in the line of a dyno test mean? I was looking at some dynos on the forum and in the HP line there were spots where the lines would break and then continue. Does that mean the computer didnt record for a few seconds or ...? thanks

02-04-2013, 05:26 PM	#2
Boosted2.0 Senior Member Join Date: May 2012 Drives: 13 FR-S, 00 Spyder&Celica, 08 Tundr Location: Sealy, Texas Posts: 362 Thanks: 2 Thanked 176 Times in 78 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	That generally means that the inductive pickup for the engine RPM sense went away for some reason - either it was loose, there was electrical noise on the line, or something similar. The computer was likely recording, and if you take the torque curve off the plot it will probably show you an unbroken HP curve. Last edited by Boosted2.0; 02-04-2013 at 05:51 PM.

02-04-2013, 05:43 PM	#3
King Tut NASA SpecE30 Racer Join Date: May 2012 Drives: 2006 Honda S2000 Location: Gulf Breeze, FL Posts: 7,279 Thanks: 607 Thanked 5,759 Times in 3,055 Posts Mentioned: 274 Post(s) Tagged: 10 Thread(s)	Yep. It is farily common on the newer digital igntions where you don't have a nice big plug wire to put the pickup on. Some dyno shops won't even give you RPM if they can't find it, so it is always best to know what kind of pickup is needed and where the dyno operator should place it before making the trip. __________________ - King Tut Street/Track Car: 2006 Honda S2000 TT3 \|\| Race Car: 1987 BMW 325is SpecE30 \|\| Tow Vehicle: 2014 RAM 1500 EcoDiesel Sold Cars: 2012 BMW M3 \|\| 2013 Subaru BRZ \|\| 2012 Porsche Cayman R \|\| 2009 Chevrolet Z06 \|\| 2009 BMW M3 \|\| 2004 BMW M3 \|\| 2004 Nissan 350Z

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