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      09-14-2017, 07:29 PM   #23
T1M
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Quote:
Originally Posted by martymil View Post
Correct

Too aggressive for our fuel, us98 is like our 95.

It just pulls timing, thats why I like custom maps and not of the shelf ones.

Your better off running a 95 ron map on our 98ron fuel or add 7 to 10 litres of e85 with every fill up and log

the difference is minimal and not worth the hassle
The US don't have 98 Ron, they grade their fuels differently. To put it simply they have 93 which has a little better knock resistance than our 98. Our 98 is like their 92, and there aren't OTS maps based on their 92.

I've heard people reporting a few degrees of timing pull even running a few litres of E85 in a tank of 98 when using a US93 map. 95 maps will still pull timing in the spool and low load regions.
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      09-14-2017, 07:40 PM   #24
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Quote:
Originally Posted by Drawn05 View Post
So OTS MHD 98ron maps are too aggressive for 98ron, unless I run 10litres of e85? So 95ron maps for straight 98ron pump fuel?
The maps are a bit aggressive and a little E85 helps to make the car feel a lot more consistent. But its not like its overly agressive, the ECU does adapt and the car drives fine as long as you have good plugs (NGKs do help with the OTS maps).

But you do sometimes get timing corrections which you can feel, mostly at lower revs on spoolup. Most people don't notice this though.

A custom tune by someone whos very experienced in the platform and willing to develop the tune for all driving conditions. ie you won't get a great tune with a few iterations where you only send WOT logs.
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      09-14-2017, 08:41 PM   #25
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so running a stock 1M (updated charge pipe), with MHD stage 2 tune, should i get the 95ron tune? (will be adding an intercooler in couple of months also)
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      09-14-2017, 09:01 PM   #26
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Yes unless you want to blend everytime you fill up

The gain is minimal and a pain in the arse
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Last edited by martymil; 09-15-2017 at 06:11 AM.
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      09-14-2017, 11:33 PM   #27
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Quote:
Originally Posted by Rajvosa View Post
so running a stock 1M (updated charge pipe), with MHD stage 2 tune, should i get the 95ron tune? (will be adding an intercooler in couple of months also)
Definitely. knock ratings from a standardised CFR lab engine. In the US most pump gas actually has some small amount of ethanol in it and that has a disproportional benefit on a modern DI engine. So our ron ratings behave worse than you would expect from the equivalent ACN rating.
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