Discussion in 'Technical forum' started by Yagel, 16 June 2017.
We've made the logs & everything on the same DYNO..
And the same dyno on the same day can make different results.
Seeing that you and a mate had your cars on the same dyno (on the same day ????) then I would ask the operator if he can print out the results for both cars on the same sheet.
power,torque and boost data to see where they vary and post it so we can get a better idea of what's happening and where the differences are .
IF they can't or won't do this then you can have your dyno sheet copied onto clear film so you can over lay it on your mates dyno sheet to compare results
It can't, me and my friend both Leon cupra owners stage 2, we've both been the same Hp& kgm and now he is the same as we was (340/52)
And I'm (320/50) we've done the dyno one after each other Same humidity same temp same fuel same tuner .
About the dyno graph, it's looks the exact same just I'm under his graph with hp&kgm
Same drawing same boost holding rpm just less Hp and kgm
It can. Which is why testers should run a car at least three times and will give you the average results. Because even three times in a row will produce different results!
I give up, you aren't supplying any info we can work with and appear to be in denial about how things work.
ude we've ran each car 3 times, I'll ask for the dyno and post it here
even tyre pressures can make a difference to dyno results.
My driven tyres are pumped up to 40 psi when on the dyno.
Different tyres and pressures as well as how it is strapped down on the rollers can affect the level of grip on the rollers and give different results.
So are you absolutely sure that absolutely everything is equal on both cars ?????
You have had many people tell you that a difference is perfectly normal indeed to be expected on different days on the same dyno
Its worth adding that the more you tune a car the more likely a small difference in conditions will make .
so to be exact ....
your difference is under 6% and your car has been tuned
Honestly you could get that difference on two back to back runs just by different driving style. sometimes turning the engine fan off could do it.
I have had this demostrated by a dyno specialist who managed to get 40bhp difference on back to back runs simply by changing up to the final gear at difference revs on my car .
As to losing to a car one day that you beat another day... well 20bhp out of 340 is unlikely to do that
Thank you @SLEEPER, I think that sums it up perfectly
20bhp is not a big deal!
I hope that this Saturday I'll have an answer for you guys, I'll update if the problem has solved
And sorry but 20whp and 5 kgm on a seat Leon cupra is alot
Is it being tested on a hub dyno then?
Mustang dyno yes same place
So hub and not rolling road?
Mustangs are "rolling road "type Dyna Pak are hub type
So it's BHP as opposed to WHP then?
Rudders in a sense they both measure "wheel HP " despite the Dyna Pak needing the drive wheels removed to fit the hubs.
With the DP dyno the possibility of tyre to roller slippage is eliminated due to the hubs being bolted to the wheel studs/lugnuts.
The DP dyno takes a little longer than a roller dyno to have everything ready to start tuning/testing especially if the car is an AWD as all wheels have to be removed and 4 hubs fitted.
Yeah I know what a hub dyno is dude as I had mine run on one a few months back. I'm just saying they eliminate tyre slip etc and they normally quote WHP from them as they're more accurate. Most rolling roads in my experience quote the BHP in comparison. I was just checking he was giving us the correct figures as they can be quite different in terms of what the car's producing etc.
I only put the links for the enlightenment of people who don;t have a clue about what we are discussing
In my experience most if not all chassis dynos quote HP at the tyres over here.
20 out of 340 is 5.88 % and honeestly that isnt a lot . No way will that mean you beat someone easily as opposed to getting beaten.
Did this happen?
I'm guessing it didn't.
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