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YOUR RESEARCHdyno results - tyre effects
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Check things like tyre pressure and strap tightness etc
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Suggestion · Original poster
When the dyno operator first noticed my lower than expected result he got straight into checking things like tyre pressure and strap tightness etc.
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Suggestion · Original poster
Since I have done a few dyno pulls in different configurations this particular run has highlighted the effect that tyres can make to a dyno reading.
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Suggestion · Original poster
If you look at the climatic conditions on the day of the last and previous run, they are not that much different anyway, a few of the conditions were slightly better and a few were slightly worse.
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Suggestion · Original poster
I just did another dyno run with my car to baseline it before the ECU gets re-mapped this week.
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Suggestion · Original poster
If you look at the climatic conditions on the day of the last and previous run, they are not that much different anyway, a few of the conditions were slightly better and a few were slightly worse.
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I just did another dyno run with my car to baseline it before the ECU gets re-mapped this week. Since I have done a few dyno pulls in different configurations this particular run has highlighted the effect that tyres can make to a dyno reading. In this case 13Hp less recorded with my new PS2s vs with my old/worn Contis.
Details here --->
http://www.oz951.com/public/emmy.htm...%202011%20Dyno
I ended up doing a bit more research into the subject and have included a link to an interesting article.
There is also some information on spark plugs since I was doing some digging on that subject as well.
I just bookmarked and spent a couple of minutes on your website...
Great source of information for a 996 newbie like myself!
Thanks OZ and keep up the good work!
Even engine oil and transmission fluid can have an impact. It's even possible that there is a problem with the dyno's weather station - which is supposed to help correct for temp/humidity/pressure variations.
The weather station had fresh batteries, was reading as expected etc so I'm not doubting the setup of the dyno itself. (This is the same dyno I have been to the last 3 or 4 times and I am confident the operator knows what he is doing).
The dyno has been run in the same configuration for my last 30 runs so SAE correction isn't a significant factor. If you look at the climatic conditions on the day of the last and previous run, they are not that much different anyway, a few of the conditions were slightly better and a few were slightly worse. The shootout mode is designed to account for those variations as it measures & calculates the result.
The difference in diameter between a worn tire and a new tire is ~12% (25.3" vs 25.0"). That yields a smaller moment arm at the contact patch of the tire and a reduced torque value of ~12%. This could easily account for your difference in measured torque values.
-Shawn
No worries, hopefully some info there will be of help at some point.
Going to a differennt dyno in 1/2 hr to get the car re-mapped, so this will be interesting to note the differences between the initial run and my last run and then the differences before and after tuning as measured on the same dyno.
Wish me luck as we try and eek a few more ponies out of her.
That is correct. When the dyno operator first noticed my lower than expected result he got straight into checking things like tyre pressure and strap tightness etc.
The ECU re-map has been done - dyno results here ->
http://www.oz951.com/public/emmy.htm...%202011%20Dyno
its the same link just a tad further down the page.
This is a source reference. Confirm exact model applicability in the original material.
