SPIKO Gold Donating Members 1,924 Member For: 19y 7m 7d Gender: Male Posted 04/12/09 08:59 AM Share Posted 04/12/09 08:59 AM I hope I havn't oftended you Champ, this was not my intention, I am just stating my point of view! Link to comment Share on other sites More sharing options...
MercuryXr6Turbo Member 361 Member For: 16y 1m 15d Gender: Male Location: Perth, WA Posted 24/12/09 03:27 PM Share Posted 24/12/09 03:27 PM Further to the last 2 posts... why is there such variances between dynos? Sometimes even different workshops, but same brand of dyno (Dyno Dynamics for example) are used but figures can read so differently as Bogan says. Does the tension on strapping the car effect it or something the workshop does to get a better "on paper" figure??? Link to comment Share on other sites More sharing options...
mattyb Donating Members 1,097 Member For: 16y 5m Gender: Male Location: Gold Coast, QLD Posted 26/12/09 02:17 AM Share Posted 26/12/09 02:17 AM I've juyst been showing this to some mates and we are in a heated discussion, I've asked this before but can't find the thread where I asked it...My car runs 359rwkw and 1000+Nm when run on a mainline dyno in gear 3 of 6 with the ZF auto. What difference would I see being run on the same dyno, in 4th. Some people have their cars tuned in 4th and some in 3rd (six speed boxes). If I had my car dyno'd in 4th would my power readout be higher/lower and by approx how much, and I'm assuming my torque would be down, but by how much??? Please help as due to the excess alcohol consumption today the arguements are flairing up... ONE TIME! Link to comment Share on other sites More sharing options...
SPIKO Gold Donating Members 1,924 Member For: 19y 7m 7d Gender: Male Posted 26/12/09 02:58 AM Share Posted 26/12/09 02:58 AM It depends on the tune fellas! Most tuning is in fourth on a 6 speed, if the car feel good and goes like hell don't worry bout the dyno figure!!! Link to comment Share on other sites More sharing options...
(BOOSTN) Member 25 Member For: 14y 4m 2d Posted 28/07/10 11:05 AM Share Posted 28/07/10 11:05 AM all pretty close results, beside the hot spot reading..thanks for that Link to comment Share on other sites More sharing options...
gtrskyline899 Member 2 Member For: 14y 1m 25d Posted 22/10/10 09:28 AM Share Posted 22/10/10 09:28 AM Mainline FTW!!! Link to comment Share on other sites More sharing options...
bigpsi New Member 20 Member For: 15y 5m 4d Posted 27/10/10 09:33 AM Share Posted 27/10/10 09:33 AM interesting to see the results, so many people just want to see a big number come up on a screen I guess this proves that a dyno power figure isnt everything... Link to comment Share on other sites More sharing options...
kartman Member 88 Member For: 15y 2m 2d Posted 13/11/10 11:59 AM Share Posted 13/11/10 11:59 AM It depends on the dyno, the Dynamic Test Sytems Dyno I use cannot be fudged without leaving evidence, strapping can effect power on dynos that don't connect the rollers, as the cars lift off the rear rollers they no longer need to be driven and less power is consumed more is read. As a law of physics, it takes more energy to accelerate a mass faster than slowly. So a dyno should give it's highest reading static, no acceleration as no power is being used to accelerate the rollers only to maintain the speed. On a fast ramp rate, rapid acceleration, the measured power will be less as more power is consumed accelerating the roller and drivetrain mass. A slow ramp rate will produce a higher reading. The difference between 3rd and 4th if the rate of acceleration does not change is the windage, this is the drag on the wheels and moving parts, gearbox internals and alike. Dyno Dynamics dynos produce higher power figures at faster ramp rates, this defies physics, it is the opposite to one of Newtons laws. This is why I personally take little credit in the readings off them. Link to comment Share on other sites More sharing options...
Turbo6FG Silver Donating Members 497 Member For: 14y 8m 12d Gender: Male Posted 13/11/10 01:08 PM Share Posted 13/11/10 01:08 PM If you really want some good info on how dynos work there is a 4 part article on the Nizpro forum called 'Dyno numbers why so different?'. It's very interesting though it might take a week to read it. Explains all about different dynos, their advantages & limitations, how people fudge the numbers & how they can be misused.Once you read it you realise why dynos are just a tuning tool. There is no governing standard between different dynos. Generally they are fairly close but sometimes they are way out. I used to take the numbers seriously but now just quote them for fun & to impress mates with Holdens who are none the wiser. Link to comment Share on other sites More sharing options...
kartman Member 88 Member For: 15y 2m 2d Posted 13/04/12 11:48 AM Share Posted 13/04/12 11:48 AM There is more to it than that, Thd DTS Prodyne is the only dyno to have connected rollers, front to rear, here is something we did to demonstrate why. http://s226.photobucket.com/albums/dd214/4wheelinls1/?action=view¤t=Howtocheatthedynorollers.mp4 Link to comment Share on other sites More sharing options...
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