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fuel pump low/high voltage transition table

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Old Jan 15, 2012, 08:00 AM
  #16  
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Originally Posted by L-op View Post
There you go :
Thank's!!!
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Old Jan 15, 2012, 09:01 AM
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I had a chance to play around with the tables. I had posted to MRFRED that with the new Walbro 400lph pump I was getting an 18psi jump in fuel pressure when cruising down the highway. I was able to capture fuel pressure and boost with my DEFI gauges as they can record and playback runs. This was cruising down the highway at 80mph in 5th gear (~3800rpm). The concern was not being able to maintain a stable tune resulting in a potential decrease in mpg.

Here is the initial video with the stock high/low voltage setpoints.
Before Video ~30meg

So based on the 80mph in 5th gear resulting in a 3800rpm range I modified the table and felt like a load of 100 was a good number for voltage switching. Below is the before and after table.


Below is the video of the gauges after the change to the table.
After Video ~20meg
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Old Jan 15, 2012, 09:34 AM
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Originally Posted by L-op View Post
Is there any hysteresis value ?
Yes. I updated the first post.
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Old Jan 15, 2012, 09:56 AM
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Originally Posted by 240Z TwinTurbo View Post
...



Below is the video of the gauges after the change to the table.
After Video ~20meg
Looks like you're still getting a big bump in fuel pressure. Don't be afraid to significantly raise the values. 100 load is like 1 psi of boost. I believe that most people set their Hobbs switch for dual Walbros to about 4 psi. I've currently got my table set to match the open loop load, and I get a few psi bump at the transition. Seems like it needs to be a little higher for a Walbro 400.

The reason I set it to the open loop load is so that during closed loop driving the fuel pressure will be appropriate. I'm considering raising it another 10 load.

Also, you're best off not to change the rpm values in that table. The rpm axis is used for many different tables.

Here is my current table:

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Old Jan 15, 2012, 10:40 AM
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^
Thank you and I will make the changes and video the results.
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Old Jan 15, 2012, 10:43 AM
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Originally Posted by mrfred View Post
Yes. I updated the first post.
Thanks you sir !

Updated 88840017,96530006 & 90550001.

88840017

Code:
<table name="Min Load for Fuel Pump High Voltage" category="Fuel" address="3FF2" type="2D" level="1" scaling="Load8"> 
<table name="Engine Speed" address="6C82" type="Y Axis" elements="10" scaling="RPM"/>
</table>
<table name="Low/High Voltage Transition Hysteresis" category="Fuel" address="1674" type="1D" level="1" scaling="Load16"/>
96530006

Code:
<table name="Min Load for Fuel Pump High Voltage" category="Fuel" address="4568" type="2D" level="1" scaling="Load8"> 
<table name="Engine Speed" address="6576" type="Y Axis" elements="10" scaling="RPM"/>
</table>
<table name="Low/High Voltage Transition Hysteresis" category="Fuel" address="1A74" type="1D" level="1" scaling="Load16"/>
90550001

Code:
<table name="Min Load for Fuel Pump High Voltage" category="Fuel" address="438E" type="2D" level="1" scaling="Load8"> 
<table name="Engine Speed" address="4ca2" type="Y Axis" elements="10" scaling="RPM"/>
</table>
<table name="Low/High Voltage Transition Hysteresis" category="Fuel" address="1A72" type="1D" level="1" scaling="Load16"/>
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Old Jan 15, 2012, 03:32 PM
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I think this is close enough. When you actually quickly transition onto boost you don't really see spike because the boost sweeps so quickly.

Update Gauge Video ~16meg

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Old Jan 15, 2012, 05:22 PM
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That looks pretty good.
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Old Jan 15, 2012, 05:46 PM
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Originally Posted by mrfred View Post
That looks pretty good.
Thank you for all of your help
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Old Jan 15, 2012, 08:57 PM
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Another great find! Thanks,mrfred!
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Old Jan 16, 2012, 08:28 PM
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Mrfred, are the three other values in that sub-routine start up timer related?
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Old Jan 16, 2012, 08:35 PM
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Originally Posted by 03whitegsr View Post
Mrfred, are the three other values in that sub-routine start up timer related?
I don't have my Evo laptop handy, but the code does hold the pump at full voltage during cranking and for an adjustable period of time thereafter. That's one of the values. Off the top of my head, I can't remember what the other two items are.
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Old Jan 16, 2012, 08:51 PM
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Cool, thought it was a start up timer, just thought I'd verify with somebody else. It looks like it is temperature related. The flag is set two subroutines earlier in the sub that calls this sub. Not sure if it's the same on other ROMs but the two flags are tied together so there are effectively only two values and not three.

ECT >82C and IAT > 50C seems to be the change over point on 96530006.

I wonder if it could be used to help the warm start issues on the ID1000s.
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Old Jan 16, 2012, 08:51 PM
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Thanks!

You sir are awesome! Once the weather turns around I'll have to give this a try...I LOVE data...
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Old Jan 17, 2012, 10:48 AM
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Doesn't the fuel pressure solenoid bypass vacuum for like 30 seconds after startup as well? I would assume that the full voltage, combined with the FPS would add a great deal of fuel at startup,no?

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