Cold start overdriven hpfp rattle fix needed

AzNdevil

Lieutenant
Staff member
Nov 4, 2016
566
269
0
Hong Kong
So @V8bait modified my tune and she started like a dream and no more rattle with cold start deleted .

She fired up perfectly first go without any stumbles or hesitation.

Thanks AzNdevil you are a bloody legend.

glad it worked out ;)

attached here for ikm0s peeps

1588238627101.png



Don't trust the Fuel Pressure Target (Homo-Cold)
I can't make sense of it and I didn't look into it further since you guys managed to get the pump to shut up after playing with the Coolant Temp Thresholds....
 

Attachments

  • IKM0S (Standard Units)-AzNdevil.xdf
    717.6 KB · Views: 175

martymil

Major General
Sep 6, 2017
3,331
1,906
0
Down Under
Ride
S65 1m
Anyone can help me out need the Ikmos VCV tables including current request to pwm request, flow to current request, max current, and the respective breakpoints
 

AzNdevil

Lieutenant
Staff member
Nov 4, 2016
566
269
0
Hong Kong
Anyone can help me out need the Ikmos VCV tables including current request to pwm request, flow to current request, max current, and the respective breakpoints

i think these are available on vtt's site to support shotgun tuning
lmk otherwise...i can look into them for you
 

TheFixer

Sergeant
Aug 16, 2020
493
352
0
Tennessee
Ride
2008 535i
The hpfp can be noisy? I have a lot of rattle noise on start up. After reading this thread I wonder if my hpfp is making all the noise i am hearing on start up. I thought i have a noisy air pump.
 

doublespaces

Administrator
Oct 18, 2016
9,303
4,331
0
AZ
Ride
2009 E93 335i
If its overdriven in anyway way it will be noisy as it's part of cold start which has to be turned off

The hpfp chatter fix can eliminate 90% of it. The problem is there is an initial startup that causes it to chatter as well and I believe someone said the only way to eliminate that would be to play around with the voltages which at the time nobody felt like doing.
 

JohnDaviz

Lieutenant
Jan 6, 2019
863
577
0
Ride
335i E92 DCT
i seem not find information about how to fix it. Anyone care to explain what needs to be done?
 

Traf

Sergeant
Aug 3, 2017
344
197
0
Ride
135i
In which tune?
There are multiple tables available to reduce the current applied to the VCV during startup, and the time frame during which this current is applied.
Everything is available here on SS.
 

JohnDaviz

Lieutenant
Jan 6, 2019
863
577
0
Ride
335i E92 DCT
I have all the tables. I was asking for advice how to work on these tables as i have no experience. I did not find any info on tuning direction.
 

Traf

Sergeant
Aug 3, 2017
344
197
0
Ride
135i
Reduce the time during which the startup current is applied for example ?