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Author Topic: ignition timing table setup for 100 octane fuel  (Read 14783 times)
fknbrkn
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« Reply #15 on: October 31, 2019, 07:13:29 AM »

Pretty sure this problem gone with normal injectors
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woj
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« Reply #16 on: October 31, 2019, 07:49:49 AM »

Then my bet is on your TVUB being off. You can of course fix the symptoms by messing with FKSTT, but that should really not be necessary.
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pieros_net
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« Reply #17 on: October 31, 2019, 07:52:03 AM »

Tvub I fixed by the datasheet of the injector.
See attached picture
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pieros_net
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« Reply #18 on: November 01, 2019, 02:21:18 AM »

Goodmorning guys,

Problem Solved!

I increased 20% the FKSTT and the Car start this morning very good.

thank you to all
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BlackT
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« Reply #19 on: November 01, 2019, 03:10:22 AM »

Can you post screen shot old vs new table? Please
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prj
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« Reply #20 on: November 02, 2019, 06:23:47 AM »

Correct me if I'm wrong, but I was under impression that the flame front velocity of E85 and 105+ was different and might change where 100% angle efficiency is.

Again, this is not from personal experience but from what I "heard".

I'm skeptical, of course.

What are you attempting to accomplish?
The differences are miniscule.

KFZWOP is used for calculating angle efficiency which goes into torque and EGT model calculations.
Unless you have a perfectly calibrated engine dyno and a LOT of time and you really care about the output of torque being 10nm less or more, then there is absolutely no point to _ever_ touch these maps.

Saying otherwise just shows complete lack of understanding...
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fknbrkn
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« Reply #21 on: November 02, 2019, 07:30:23 AM »

What about the engines with lower cr?
Is there a reason to raise a bit kfzwop to slightly compensate less efficiency?
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prj
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« Reply #22 on: November 03, 2019, 06:31:54 AM »

What about the engines with lower cr?
Is there a reason to raise a bit kfzwop to slightly compensate less efficiency?

Tell me, how does a lower engine compression ratio affect MBT with a 120 octane fuel?

How does a lower compression ratio change angle efficiency when the angle is the same?
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prj
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« Reply #23 on: November 03, 2019, 06:52:10 AM »

Here guys, I made a flowchart to help you out some.

Also apart from that, unless you have something where torque is important to have with <5% precision, like a DSG then there is absolutely no point to ever touch this.
And I do hope your KFMIRL and KFMIOP are stock too, or KFMIRL is linear and not increased only in last columns. Because then your torque is fubar anyway.
« Last Edit: November 03, 2019, 06:54:07 AM by prj » Logged

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fknbrkn
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« Reply #24 on: November 03, 2019, 07:45:45 AM »

Tell me, how does a lower engine compression ratio affect MBT with a 120 octane fuel?

How does a lower compression ratio change angle efficiency when the angle is the same?

Let's say we have 10 deg on a 3000 rpm etc and that's a 60% angle eff and 100nm on a stock engine
But what happens when the cr drops? Same ignition gives less torque then (with the same other conditions)
So here is the master plan
Raise kfzwop so that 10  deg gives 50% and 80nm
Not a precision tuning I know but why not? And btw 225 cr9. 0 differs cr9.5 180hp engines same way
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prj
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« Reply #25 on: November 03, 2019, 07:54:12 AM »

Let's say we have 10 deg on a 3000 rpm etc and that's a 60% angle eff and 100nm on a stock engine
But what happens when the cr drops?
Newsflash, when CR drops, your non-knock limited MBT is still in the same place.
And it's still 60% angle efficiency.
So all you wrote is BS.

In this case for the same torque you need more load, meaning KFMIRL needs to be recalibrated.
Ignition angle efficiency has absolutely nothing to do with this.

All this is an ABSOLUTE waste of time unless you have an engine dyno and research fuel.
Add to that ignorance of how the system works and everything you change will just screw shit up.

There's probably less people on this forum than I have fingers on one had who actually:
a) understand how this works
b) have the means to calibrate it

For everyone else, including you, just look at the flow chart Wink

« Last Edit: November 03, 2019, 07:56:20 AM by prj » Logged

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fknbrkn
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« Reply #26 on: November 03, 2019, 08:28:23 AM »

Why there are different kfzwop then between 125 180 and 225 engines?

Its not my primary work and i dont have tons of time to dig it so yes im asking questions sometimes you moron  Wink
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dream
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« Reply #27 on: November 03, 2019, 12:23:21 PM »

Here guys, I made a flowchart to help you out some.

Also apart from that, unless you have something where torque is important to have with <5% precision, like a DSG then there is absolutely no point to ever touch this.
And I do hope your KFMIRL and KFMIOP are stock too, or KFMIRL is linear and not increased only in last columns. Because then your torque is fubar anyway.
That chart made me laugh Cheesy Cheesy
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totti
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« Reply #28 on: November 03, 2019, 02:11:14 PM »

Here guys, I made a flowchart to help you out some.

Also apart from that, unless you have something where torque is important to have with <5% precision, like a DSG then there is absolutely no point to ever touch this.
And I do hope your KFMIRL and KFMIOP are stock too, or KFMIRL is linear and not increased only in last columns. Because then your torque is fubar anyway.

What about the axis change? I read that if I change the KFMIOP axis I should change KFZWOP axis too.
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prj
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« Reply #29 on: November 03, 2019, 02:29:35 PM »

I don't know where you read that, if you are making random modifications to KFMIOP/KFMIRL then KFZWOP is the last of your worries.
Just forget the map exists. If you are wondering whether to change it then the answer is always - no.
Those who need to change it will never need to ask the question.
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