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View Poll Results: What tuning should the car be set at ?
Premium 95 RON fuel or higher eg 98 RON 22 84.62%
Leave it as is so I can run 91 RON if I'm cheap 5 19.23%
Multiple Choice Poll. Voters: 26. You may not vote on this poll

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Old 09-10-2004, 23:24   #1 (permalink)
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Tuning car to run on Premium

Hey all.

I'm contemplating having the xr6 set up to run on 95 RON(premium) fuel instead of the crappy 91 RON stuff. Should I do this ? Is the benefit that great ? Would I even notice the difference at the pump with price ? Any feedback on this would be great.
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Old 09-11-2004, 00:02   #2 (permalink)
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Re: Tuning car to run on Premium

There is nothing to setup on a AU, simply pump the fuel in.

I feel AU's do gain from higher octane fuels because of the higher CR of 9.6:1.
The improvement isn't huge, but is worthwhile IMO.

The premium fuels such as BP Ultimate, Shell Optimax, and Mobil Synergy 8000 should also be more refined, so an should run a little cleaner.

Rick.
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Old 09-11-2004, 00:04   #3 (permalink)
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Re: Tuning car to run on Premium

I neglected to add that this would be due to having the Unichip and advancing the timing. I believe this is possible to do ?
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Old 09-11-2004, 00:05   #4 (permalink)
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Re: Tuning car to run on Premium

With a Unichip there would most certainly be advantages.

Rick.
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4L I6, naturally aspirated producing 173.5rwkw.
14.410 @ 96.49mph with street radials.
What's that?..... Did I hear you say TQE power?
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Old 09-11-2004, 00:31   #5 (permalink)
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Re: Tuning car to run on Premium

With the unichip everyone was focussing on the air fuel ratio's being leaned out to 12's from 10's on the ford to give good results but of course if you rock up with a tank of Optimax (thats what APS recommended) then you can also tune the ignition advance to suit the better fuel. The knock sensors in the AU mean u can still run ULP if you like but the knock sensors will remove haeps of advance and power.

I think with a unichip the ign will be able to be advanced up a few more degress on PULP and that will see small but significant gains. More than air filters and intake boxes and the like.
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Old 09-11-2004, 00:35   #6 (permalink)
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Re: Tuning car to run on Premium

SO does that mean if you are out in the stix without optimax that you car will ping?
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Old 09-11-2004, 00:47   #7 (permalink)
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Re: Tuning car to run on Premium

No all AU's run knock sensors so they won't ping. As soon as the knock sensors hear a ping(detonation) it retards the ign back 10 degress and then steps it back up till it pings again. the ecu is a 16Mhz processor which isn't fast but its doing this prety quickly and many times a second.

It will hurt performance to run on ULP but not the engine even if it is tuned to run on ULP.

Even the BA XR6T can run on ULP.
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Old 09-11-2004, 00:54   #8 (permalink)
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Re: Tuning car to run on Premium

I thought the AU ECU dropped the ignition back 4deg at a time.

Rick.
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4L I6, naturally aspirated producing 173.5rwkw.
14.410 @ 96.49mph with street radials.
What's that?..... Did I hear you say TQE power?
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Old 09-11-2004, 01:00   #9 (permalink)
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Re: Tuning car to run on Premium

Soxx you're probably right I just said 10 degrees as an example really i don't know the value but was talking to the APS guys about it at the Unichip demo day at Autotech and they were saying when it intervenes it knocks the ign back a lot so even with the new intercepted value it still works fine.
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Old 09-11-2004, 01:08   #10 (permalink)
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Re: Tuning car to run on Premium

Only a few days till WSID now, you have any tricks up your sleeve?

Rick.
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4L I6, naturally aspirated producing 173.5rwkw.
14.410 @ 96.49mph with street radials.
What's that?..... Did I hear you say TQE power?
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