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 Post subject: '04 FXT Timing Map Advice Wanted
PostPosted: Thu Dec 11, 2025 1:53 am 
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Hi all, have decided to have a go at self tuning my 04 Forester xt EJ255 5MT. The car is basically stock except for cat deletes, Hyperflow TMIC and Turbosmart BOV. Shooting for around 16psi peak boost using a MBC. Just hoping someone with some experience could have a glance at my base timing and knock advance maps and tell me if I'm safe or way off. KCAM map was copied from Patricks ULT Stage 1 haha. I've rescaled the load as I was seeing up to 2.55 during test pulls, and as you can see the 2.4 and 2.6 load ranges are very heavily retarded because I'm just trying to create a super safe starting point, tuning timing feels alot more involved (and scary) than anything else and I really don't want to hurt the car. Thanks in advance to anyone willing to have a look (:


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.kcam.png
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 Post subject: Re: '04 FXT Timing Map Advice Wanted
PostPosted: Fri Dec 12, 2025 7:08 am 
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Joined: Sat Jul 06, 2013 8:55 am
Posts: 3264
Location: NI
i would say overall you probably have too much timing, taking the advance map from someone elses tune but not the base timing as well rarely works out. Remember the ECU is adding both of these tables together and using that as the target value so at say 2.4 load you'd be up over 24 degrees total at high RPM which is likely too much.


when adjusting the base/kca maps add them together first to see what you are actually working and compare them between roms in their combined format - you can add them up pretty quickly in excel/spreadsheet apps

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 Post subject: Re: '04 FXT Timing Map Advice Wanted
PostPosted: Sat Dec 13, 2025 8:09 pm 
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Joined: Thu Dec 11, 2025 1:41 am
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bludgod wrote:
i would say overall you probably have too much timing, taking the advance map from someone elses tune but not the base timing as well rarely works out. Remember the ECU is adding both of these tables together and using that as the target value so at say 2.4 load you'd be up over 24 degrees total at high RPM which is likely too much.


when adjusting the base/kca maps add them together first to see what you are actually working and compare them between roms in their combined format - you can add them up pretty quickly in excel/spreadsheet apps


Yep, makes sense, thanks for the advice. If you don't mind another question, in this case would you be editing the base timing map or the KCA map? From what I've read it can be helpful to have a 6-8 degrees in the KCA map so that the ecu has a fair bit of power to automatically adjust timing, so I'd assume editing the base timing is where i want to make changes.

Just on a side note, I've done a fair bit of logging and using my diy det cans and haven't had any noticeable knock on this map, which makes me curious as to how well the ECU can adjust to avoid knock even with fairly high base timing like this? Or is it better to have a low, safe baseline and let KCA do the advance? Thanks again :)


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