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Discussion Starter #1
Greetings to all.

I have recently purchased a Diablosport Trinity T1000 tuner for use on my 2009 Chrysler 300C SRT8 6.1L.

After reading through many of the forums I decided it would be a good investment, especially as I just shipped over and installed my new Corsa Extreme Catback exhaust system, hence needing a re-tune. Customs tax to import was $314 to clarify to anybody looking to import the part to Perth, and yes it is fully compatible for Right Hand Drive.

I took the car in for a dyno, and asked the lads to get the new Air/Fuel ratios to input into my tuner and work it from there. After running the 93 octane performance tune, my car dropped 20hp?

Turns out the characteristics of the fuel here in Australia as well as the difference in climatic conditions means the custom tunes are a complete waste of time lol... yes, how stupid do I feel.. I know right...

Well, anyways I'm now on the look out to find anybody that knows of any custom tunes for the Australian market, and the fuels we run over here????

I can obviously send my original trinity backup info to them as well as driving around doing data logging.

Cheers
 

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I told Diablosport on their forums that their canned tunes were crap. Their response was 'crap eh'. One day I might get around to a CMR tune but I'm still not certain it's worth it. By now I'm used to it in standard form. The 5.7 canned tunes were a noticeable increase in performance and driveability in my Gen 1, not so the SRT. (Gen 2, can't speak for the Gen 1 SRT).
 

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Gen 1 CMR tune netted me 33 RWHP after I had installed a canned tune so they are worth it, IMHO. The tuning tweaks were done on a dyno and that worked out very well. I'd get in touch with Johan at DS to discuss a custom tune by email or find an authorized CMR tuner in your area.
 

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Discussion Starter #4
Thanks for your advice guys, the first thing I did was try a few off the guys at Diablosports, but I haven't received any feedback yet. As to whether the emails actually sent or not is anyone's guess though, they said they sent but I have 3 messages still in the outbox on the diablosport interface?

Anyways, I'm just about to drive down south now, so it's a good chance to collect some valuable data on the way down from Perth to Manjimup.

Thanks again,

Batesy.


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Discussion Starter #5
After a bit of research, I found this write up particularly helpful. A big thank you to MIKE_LEVY for posting this only the DS Forum:



A little help for those of you outside North America, who get 91, 95, and 98 octane from your pumps.

Octane is rated in multiple ways, RON, MON, AKI. Lets explain them.

RON - Research Octane Number. RON is determined by running the fuel in a test engine with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of iso-octane (RON & MON 100 by definition) and n-heptane (RON & MON 0 by definition). This is how they measure gas in most of the world. You'll normally find 91, 95 and 98 octane.

MON - Motor Octane Number. MON is also known as aviation lean octane. MON is a better measure of how the fuel behaves when under load, as it is determined at 900 rpm engine speed, instead of the 600 rpm for RON. MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, higher engine speed, and variable ignition timing to further stress the fuel's knock resistance. Depending on the composition of the fuel, the MON of a modern gasoline will be about 8 to 10 points lower than the RON, however there is no direct link between RON and MON. Normally, fuel specifications require both a minimum RON and a minimum MON.

In the US, we add both RON and MON together and divide by 2 (RON+MON/2)to get our pump octane (87, 89, 91, 93, etc). This is the octane rating that the DiabloSport tunes are based on. Its also known as the AKI, or Anti Knock Index. Because of the 8-10 point difference between RON and MON, the octane rating in the US and Canada is 4-5 points lower then the rest of the world, for the exact same fuel.

RdON- Observed Road Octane Number. Derived from testing gasolines in real world multi-cylinder engines, normally at wide open throttle. It was developed in the 1920s and is still reliable today. The original testing was done in cars on the road but as technology developed the testing was moved to chassis dynamometers with environmental controls to improve consistency. Its rarely used in the automotive world, and most people don't even know it exists.

I hope this clears up the confusion for those of you not in the US/Canada. Use the 91 tune if you use 95 RON octane fuel. Use the 93 tune if you use 98 RON octane fuel.


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