View Full Version : How does Dyno testing work?
Sounds a stupid question and i know its on a rolling road etc. But what i mean is, what gear etc are the measurements taken, do they rag it up through each gear and take the average across each gear range or do they get to 6th and open it up??
Just wondering as i plan to take myP7F in in a few weks to see what it is actually kicking out at the rear wheel.
I plan to go to this place in Bristol, if anyone has any experiance of them??
http://www.timblakemoreracing.co.uk/ (http://www.timblakemoreracing.co.uk/)
Other than that JHS do it for £40 anyone know which method JHS use. I know Fastbikes mag use them for their Dyno testing so i can directly compare their old longterm P7F results against mine that way.
I know to expect around the 106-109 rear wheel on the P7F as standard.
Mine is going into BSD in Peterborough (http://www.bsd.uk.com/dynomometer.html) on the 3rd May for a full custom map - I will watch and ask and let you know!
Hoping to hit nearly 100hp at the back tyre (optimistically! :D )
Wil post my results :)
ukgooner
22-04-08, 03:36 PM
Do they actually carry out any tuning or is it rag the nutz out of it and see what it puts out?
Do they actually carry out any tuning or is it rag the nutz out of it and see what it puts out?
Depends on what you ask for - I am having a full custom map to get my K&N/Remus exhaust and PCIII tuned properly (~?145 inc VAT or less depending on time taken) - most places will be happy to do just a "power run" for about ?30-?40
Steve_God
22-04-08, 08:59 PM
They first find a gear that does a 1 to 1 ratio between revs and speed (somehow? not sure exactly how they work this out), and then slowly go through the engine revs at a constant rate and the 'rolling road' measures the amount of torque being put on it.
That's the basics anyway.
ThEGr33k
22-04-08, 09:16 PM
I thought they always used 4th gear? I got mine Dyno'd a few days ago and he ragged it through the gears then went to 4th ragged it through the gear to the limiter (spitting out nice flames) then using the Dyno to brake to about 4K revs and then raggin it again. Did that quite a few times and then they give you the readings.
If you care to know; mine peaked at 113.5BHP at 9500RPM and 70Ft-LBs of torque... Look below for the actual print out. :) Also showed that the bike is running slightly too lean, got told that from Other falco's he has tested fueling it right will produce a little over 120BHP at the rear wheel... Yay.
http://www.apriliaforum.com/forums/attachment.php?attachmentid=82160&stc=1&d=1208433610
Mine is going into BSD in Peterborough (http://www.bsd.uk.com/dynomometer.html) on the 3rd May for a full custom map - I will watch and ask and let you know!
Hoping to hit nearly 100hp at the back tyre (optimistically! :D )
Wil post my results :)
Just quoting myself as my bike made waaaay more power than I was expecting! :D
Just like to start by saying that Mark at BSD did an amazing job! He asked me if I would like to watch the baseline run before he spent the time mapping it. He showed me that a standard Z750 (with only a few miles on) makes between 94-96hp on his dyno. I was trying to watch to see what gear he was in and it did appear to be 6th as it was quite scary watching the Zed bounce off the rev limiter (12,500rpm) and the speedo hitting 170mph!! It made 108hp which Mark said was about average for a Z750 with the mods mine has (K&N filter/end can/PCIII) - he showed me some plots of other Z750s he has done and with similar mods and they were making between 106-108hp. He said the engine felt and I quote "nice and loose" That will be 10,000 miles of my style of riding then! :oops: He downloaded the map from the PCIII and said "there are some big numbers in there" meaning the map was quite fuel rich - not too bad though as I was still getting 46-47mpg on my commute.
I then left him to it and he spent 45 minutes or so mapping the bike and then took it for a test ride - came back and said it felt good :) The final figure was 111hp (at the back tyre) which is 3hp more than any other Z750 he has looked at and he has over half a dozen of them on his system! Well chuffed!
I then went for a 50 mile ride to the South Mids meet (http://forums.sv650.org/showthread.php?t=109007&page=6) and what can I say - the throttle repsonse is soooo much crisper and the "fluffiness" that it had at low revs has vanished - it also picks up with more urgency than before so you can blip the throttle to overtake and it just goes with so much less fuss that before - not that it was bad before - its just loads better - hard to explain - but basically I think it was well worth the £95 he charged me!
He also noted that my front forks are knackered! :shock: I know that the Zed has el-cheapo forks but he said that the springs have all but collapsed and this seems to ring true as when you bounce the front it feels like two pogo sticks and doesnt have much compliance on bouncy roads :( He recommended fitting an Ohlins shock and new springs and oil - about £450 - so now I have decided instead of thinking about changing the bike next year I will be fixing and improving the one I have - no bad thing I guess :)
Anyway - here is the map - as you can see it made more power and torque everywhere and it certainly feels fantastic now - if any of you have a Power Commander and think that the basic maps from the Dynojet website are good enough - I urge you to get a proper map done for your bike!
http://img.photobucket.com/albums/v607/skip665/z750/dyno.jpg
Dangerous Dave
04-05-08, 09:03 AM
Use JHS mate.
ThEGr33k
04-05-08, 01:18 PM
Nice improvement.
I need to contact my insurance again as they said they'd get back in touch with me about usung a power commander but they havnt...
Does your insurance know about the PCIII?
Nice improvement.
I need to contact my insurance again as they said they'd get back in touch with me about usung a power commander but they havnt...
Does your insurance know about the PCIII?
Thanks and yes they do as long as it doesnt make more than 5% power increase... :---)
petevtwin650
04-05-08, 05:12 PM
Didn't take you long to post that up on the site Skip. You lucky G!t. :smt097 :cool:
Can't have you sorting the front springs out though. Can't keep up with you as it is.:smt013
Didn't take you long to post that up on the site Skip. You lucky G!t. :smt097 :cool:
Can't have you sorting the front springs out though. Can't keep up with you as it is.:smt013
All the more reason to do it then! :smt098 :smt077 :smt110 ;)
Anyway, good job you are always 2-up as I wouldnt keep with you either! :lol:
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