OFT v2.076|Wayne Rom v130|OFT v4.01 Dynos

[Wayno]

I haven't seen V4, and didn't read this whole thread yet, but if Shiv has set IAM to 0.7 then I'd wager it's by design and whether the car runs at 1.0 or 0.5, it's working as exactly as intended with full power.

Meaning between that file and previous files where the timing has been adjusted so that IAM doesn't drop, the difference in timing is going to be fuck all.

[Jasonb]

Originally Posted by Wayno

I haven't seen V4, and didn't read this whole thread yet, but if Shiv has set IAM to 0.7 then I'd wager it's by design and whether the car runs at 1.0 or 0.5, it's working as exactly as intended with full power.

Meaning between that file and previous files where the timing has been adjusted so that IAM doesn't drop, the difference in timing is going to be fuck all.

So you're saying it won't make less power at .7, than at 1.0? That can't be true.

[coxxoc]

Originally Posted by Jasonb

So you're saying it won't make less power at .7, than at 1.0? That can't be true.

I'm pretty sure what he means is the ECU would have pulled timing before if the map was too aggressive for the fuel being used. If the engine couldn't handle 1.0 IAM before, it won't be able to handle it now. Starting at 0.7 will reduce timing for a short time. The IAM value should go up to 1.0 during operation so long as knock events aren't detected.

If you want to start out running max timing and the ECU pull it if knock events occur, change "Ignition Timing -Knock Control > Advance Multiplier (Initial)" to 1.0000. This only applies to the gasoline ROMs. The E85 ROMs stayed at 1.0 initial IAM since it isn't as knock prone.

[Jasonb]

Originally Posted by coxxoc

I'm pretty sure what he means is the ECU would have pulled timing before if the map was too aggressive for the fuel being used. If the engine couldn't handle 1.0 IAM before, it won't be able to handle it now. Starting at 0.7 will reduce timing for a short time. The IAM value should go up to 1.0 during operation so long as knock events aren't detected.

If you want to start out running max timing and the ECU pull it if knock events occur, change "Ignition Timing -Knock Control > Advance Multiplier (Initial)" to 1.0000. This only applies to the gasoline ROMs. The E85 ROMs stayed at 1.0 initial IAM since it isn't as knock prone.

On the V4 tune I'm using I set it at .9 so it takes less time to get to 1.0. I always have 93 available. Still safer than starting at 1, but I get more power right away, and max power sooner.

[coxxoc]

Originally Posted by Jasonb

On the V4 tune I'm using I set it at .9 so it takes less time to get to 1.0. I always have 93 available. Still safer than starting at 1, but I get more power right away, and max power sooner.

Your approach is reasonable so long as logs aren't showing IAM dropping or a significant number of knock correction events. The 0.7 is for folks with lower octane fuel since Shiv merged the 91 and 93 octane maps into one.

[Yoshoobaroo]

Originally Posted by Jasonb

On the V4 tune I'm using I set it at .9 so it takes less time to get to 1.0. I always have 93 available. Still safer than starting at 1, but I get more power right away, and max power sooner.

I do the same, it would take 40 mins of driving to get to .94. now it jumps to 1.0 as soon as it's warmed up.


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[Vin]

If it jumps to 1.0 very quick.. Why not just set it to 1. Apparently your fuel is good enough, that's what I see the EU guys doing, the fuel is good enough and the iam is always 1 on v4, so we set it at 1 right away.

[Jasonb]

Originally Posted by Vin

If it jumps to 1.0 very quick.. Why not just set it to 1. Apparently your fuel is good enough, that's what I see the EU guys doing, the fuel is good enough and the iam is always 1 on v4, so we set it at 1 right away.

Eventually I probably will. I was just chasing down an issue of false knock. Once I'm completely sure everything is good then I'll probably do that.

[churchx]

Vin: there always might be some exception, like filling up mid long trip not at tank one usually fills at. Or at one that has just ron 91. Imho it won't hurt to have slight safeguard left. Damn, at this point i'd love to see ecutek's multiple map switching with cruise control stick ported also in OFT. If one can put in support for some sensor/switch even if not found out how to read cruise control stick inputs, imho should be doable, as flexfuel that is possible with OFT, already switches between maps according to fuel sensor. I'd love to get my main tune, and one extra-safe one if with unknown fuel or ron 91 fill, without doing any reflashing.

[Vin]

The safeguard is the same? The ecu has room to compensate, it will adjust according to the fuel. If your fuel at home is good enough for iam 1, I'd just set it to 1. I have ecutek but use the map switching mostly for extra features (rev match, pops, LC etc). The fuel here in Europe, at least in my area, is so constant that I don't need a safe map. If I do run out of eu98 I'll just stay away from the redline, seeing different maps for different fuel have the most timing difference above 6k rpm (like Wayne roms Ron 98 vs 100 vs 102), just let the ecu do its work this whole iam debate should get a different thread, takes the focus away from the nice results the OP had with his dyno testing.

[nikitopo]

I've used the v2 maps in the past and the support of the v4 maps is not the same. The v2 maps were different per rom id and fuel type. Now he is trying to put everything in a single bag. I just don't like this change and that's all.

[tomm.brz]

Then don't use it? or do yourself the changes there are made in the v4 directly in the v2 if you want to try it

[nikitopo]

Originally Posted by tomm.brz

Then don't use it? or do yourself the changes there are made in the v4 directly in the v2 if you want to try it

I don't use it

[Jasonb]

They are made for 91/93 and made to work best with the UEL open flash header. So if you're using 93 and a UEL header like I am it'll work very well. Can't be a huge difference between the open flash header and the JDL.