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Author Topic: Having a bit of a hard time with fueling  (Read 15450 times)
ddillenger
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« on: September 29, 2013, 06:00:36 PM »

Just around 4k:

Note: actual boost is right at the map limit, not over. Tried tweaking FKKVS, and KFKHFM.

MAF isn't underscaled, it's an RS4 unit running RS4 MLHFM.



« Last Edit: September 29, 2013, 06:05:31 PM by ddillenger » Logged

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nyet
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« Reply #1 on: September 29, 2013, 06:05:26 PM »

is ps_w maxed?
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ddillenger
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« Reply #2 on: September 29, 2013, 06:07:17 PM »

is ps_w maxed?

First thing I checked. No.
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nyet
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« Reply #3 on: September 29, 2013, 06:09:32 PM »

Perhaps the pump isn't maintaining pressure at max boost?

Got a FP gauge? Smiley
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stuklr
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« Reply #4 on: September 29, 2013, 06:16:32 PM »

Any misfires present?
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ddillenger
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« Reply #5 on: September 29, 2013, 06:17:46 PM »

No, but that's sorta what I was thinking as well. Pump just can't keep up.

0 misfires.
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nyet
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« Reply #6 on: September 29, 2013, 06:18:53 PM »

No, but that's sorta what I was thinking as well. Pump just can't keep up.

0 misfires.

well it is doing fine up top, which is a good sign, because it means it is flowing fine...
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stuklr
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« Reply #7 on: September 29, 2013, 06:22:33 PM »

How would a pump be unable to keep up at 4k then be fine as rpms rise? Fuel pressure regulator maybe, not closing with boost properly to increase fast enogh.

How about vvt change over? Is that tuned to activate/deactivate at that rpm?
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ddillenger
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« Reply #8 on: September 29, 2013, 06:29:37 PM »

How would a pump be unable to keep up at 4k then be fine as rpms rise? Fuel pressure regulator maybe, not closing with boost properly to increase fast enogh.

How about vvt change over? Is that tuned to activate/deactivate at that rpm?

Tried earlier and later, same thing.
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jibberjive
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« Reply #9 on: September 29, 2013, 08:38:15 PM »

How about vvt change over? Is that tuned to activate/deactivate at that rpm?
This was my first thought when I saw the area where the issue is.
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ddillenger
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« Reply #10 on: September 29, 2013, 08:40:15 PM »

This was my first thought when I saw the area where the issue is.

Looks identical with VVT disabled as well.
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phila_dot
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« Reply #11 on: September 30, 2013, 05:34:34 AM »

Figure out why your IOT is flatlining
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prj
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« Reply #12 on: September 30, 2013, 09:38:48 AM »

Figure out why your IOT is flatlining

+1 tuning problem.
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nyet
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« Reply #13 on: September 30, 2013, 10:36:26 AM »

Why would it be unique to that car?
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ddillenger
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« Reply #14 on: September 30, 2013, 08:45:03 PM »

I'm sure it is something I'm doing wrong, but I use the same base and have never had an issue before.

Worth noting, I'm not charging anything to do this, it's a friend of a friend.

Smiley
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