Octane Adjust Ratio and msd map

[Attila]

@chris-rs380

It worked exactly as you wrote. OAR is -1.0 now. Thanks for the suggestion.

 

If I fed worse fuel, will the OAR go up on its own? If the OAR stays at -0.1, does that mean the fuel is adequate?

 

• This reply was modified 3 years, 11 months ago by Attila.

[robroy]

@chris-rs380

I will give it a go to see if it works , but does seem odd that I have good fuel in the tank , firstly vpower now tesco 99

[chris-rs380]

@Atilla @robroy

Poor fuel would make the ECU pull things back quickly. I’d assume the OAR would start to head towards positive as it sensed rubbish fuel. If OAR stays at -1.0 you’re good!

I have Tesco 99 and Shell 99 on my doorstep and always ran Tesco 99 as it is much cheaper. During tuning my car I asked Stu which fuel is best and he said Shell 99 every time for more consistent results and quality, so on his advice I always use V-power 99 now.

Stu from MSD explains things far better than I ever could so give him a call.

[chris-rs380]

https://www.motorsport-developments.co.uk/Understanding_Ford_Ecoboost_Knock_Detection.html

OAR is mentioned in this blog of Stu’s.

• This reply was modified 3 years, 11 months ago by chris-rs380.

[robroy]

chris-rs380

Wow it went to 0.98 just on a straight bit of road then finished it off up a hill , changed almost straight away, I have read Stewarts Sanderson blog before, how did you know about this little trick ???

Thanks for the tip , I will run it abit first just in case , then get some logs done 👌

[crocket81]

I data logged my MSD multimaps the other day and mine was sitting perfectly on -1.00, I always use 99 octane(v power or momentum) just currently trying the esso synergy +, seems to be better on fuel and the same price as momentum, winner winner👍🏻

[Jonathan Walmsley]

Im having the exact same issue with MSD420 multi maps. I’ve just reset my ecu learning today. And will keep trying. The best I’ve had is -0.90 and i always use shell vpower. I’ve just read the post from msd. Any help would be appreciated. Many thanks Jonathan.

[robroy]

 

@Jonathan walmsley

Do what Chris-rs380 said it works straight away up to 1.00 and mine stays there

 

 

[Jonathan Walmsley]

I’ll try tomorrow thanks. Just find it so strange as i must of done nearly a 1000 miles before today’s reset. Now done around 50 miles and it’s still at the 0.80 start point. Had you done a lot of miles before trying this?? @robroy

[robroy]

@jonathon walmsley
I had done a fair few and it wasn’t budging , I always use 99 fuel so it was annoying , I since have had my first map update from msd

 

[Jonathan Walmsley]

Yeah i always use v power. Did you get much change/difference from your update mate?? @robroy

[Jonathan Walmsley]

Well that worked a treat OAR now at÷01.00. Cheers for the help @robroy 👍

[robroy]

👍😊

[richard31337]

Hi chaps

Older thread I know, but I’ve recently gone to MSD420 and multimaps and have been working with Stewart on my data logs and tuning. I also have Turbosmart 50/50 CBV and NGK one step colder spark plugs.

My OAR seemed to be sticking at -0.80 and only recently moved to -0.85. We think there may be a leak between solenoid and CBV, but I will be looking at this more soon. It is possibly a few psi as TIP desired and TIP actual are different by around 2-3 psi… plus WGDC looks a little off.

I have tried long 3 psi pulls up hill as Stewart suggested, although I am now going to try this in 5th/60th gear as suggested by @gixxerboy since I was in 3rd/4th last time I tried this 🙂

If you’re interested, I did this 2nd gear pull in 380ps map slot purely to check my knock vs ignition correction per cylinder as I was concerned about ghost knock when viewing some earlier data. However, I have left these off this graph as there was no knock and ECU advanced all cylinders just fine.

I am really loving data logging on the Cobb, it really is an amazing tool and how ECU’s work is such an interesting field. Stewart at MSD has written a number of blogs on the Ecoboost ECU, specifically on the RS mk3 if you are interested in further reading. Fascinating stuff!

Cheers

 

• This reply was modified 3 years, 8 months ago by richard31337.

[richard31337]

That will teach me to read page one and assume it was the only page of a thread 🙂 anyway, Stu’s blog already mentioned earlier I see, and what a great read these are.

I am going to try and get my OAR to -1.00 this weekend as I see others had success with the advice given. Hopefully the 5th/6th gear method at 3 psi will work for me too.

 

Thanks chaps!

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