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  #11  
Old 03-03-2019, 09:46 PM
jondee86 jondee86 is offline
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Exclamation Re: Flickering blue light ?

That test is with the FIDC linkde as you requested. Without the link the bars
do not even reach six and none of the failsafe/warning lights are activated.

The flickering of the blue light that I refer to occurs just at the onset of boost
and before even the first bar (LHS) is lit. As boost increases the flickering stops
the "B" light turns on solid and the bars will be lit progressively until 4 bars (or
sometimes 5 briefly) are lit. In all other respects the system appears to be
operating as expected.

Cheers... jondee86
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  #12  
Old 04-03-2019, 08:29 AM
Richard L Richard L is offline
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Default Re: Flickering blue light ?

Lets go a bit further, what is the fuel injector size and the power of the engine. In other word, are you using the full capacity of the fuel injector?
... Also the water jets size, if is quite small, you may need to change the flow table.
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  #13  
Old 04-03-2019, 11:48 AM
jondee86 jondee86 is offline
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Default Re: Flickering blue light ?

Injectors are RC SL9-550cc/min and hit 80%IDC at fuel cut. The engine
boosts to 200kPa(abs) and is above 170kPa from around 4000rpm to
8000rpm. According to my logs the flowmeter is showing slightly higher
peak flow now than it was with the previous 440cc/min injectors. This is
most likely because the engine iis still running rich at WOT as I have not
yet trimmed back fuel flow to compensate for the added W-M spray.

I will need to check my nozzle selection, as the 380cc/min FAV restrictor
may have reached its limit. The figures I listed above look as if flow is no
longer following IDC at higher rpm's.

Cheers... jondee86
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  #14  
Old 05-03-2019, 01:08 AM
jondee86 jondee86 is offline
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Post Re: Flickering blue light ?

I have recalculated my nozzle selection based on the larger injectors and
the resulting slightly lower IDC at redline. The current combination of
1 x 0.7 + 1 x 0.4B should deliver a W/M to fuel ratio of 17%. This is a bit
less than the target of 20% that I use on account of running without an
intercooler. If I change the 0.4B for a 0.5 nozzle, the ratio would improve
to 21% and I can trim that as required with the GAIN control.

With the 0.7 + 0.5 combination, the estimated W/M flow rate into the
engine will be ~365cc/min @ 80% IDC. This is still within the 380cc/min
flow rating of the 0.5 FAV restrictor. How close is too close ??

I expect to be able to use a THRES value of 18% as due to improvements
to the s/c bypass, the engine now runs cooler than it did a year ago

Regards... jondee86
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  #15  
Old 05-03-2019, 11:29 PM
jondee86 jondee86 is offline
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Question Re: Flickering blue light ?

Just a thought and I don't know if it is relevant. But prior to installing the
larger injectors I was providing a PWM signal that mimiced IDC from an aux
output on my ECU. I changed this to a direct IDC pickup from an injector
negative because I needed the aux output for another purpose.

Thus there will now be a back EMF spike reaching the HFS-3 controller that
was not present previously. Could this cause the light to flicker before IDC
reaches the trigger point for W/M injection ??

Cheers... jondee86
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  #16  
Old 06-03-2019, 09:21 AM
Richard L Richard L is offline
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Default Re: Flickering blue light ?

I think removing the restrictor is essential.
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  #17  
Old 06-03-2019, 09:29 AM
Richard L Richard L is offline
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Default Re: Flickering blue light ?

Quote:
Originally Posted by jondee86 View Post
Just a thought and I don't know if it is relevant. But prior to installing the
larger injectors I was providing a PWM signal that mimiced IDC from an aux
output on my ECU. I changed this to a direct IDC pickup from an injector
negative because I needed the aux output for another purpose.

Thus there will now be a back EMF spike reaching the HFS-3 controller that
was not present previously. Could this cause the light to flicker before IDC
reaches the trigger point for W/M injection ??

Cheers... jondee86
I think it is the frequency change. HFS3 is much happier if the PWM frequency is above 80Hz. the duty update for a multi-point sequential fuel signal is quite slow. Perhaps this is the issue all along.
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  #18  
Old 07-03-2019, 01:26 AM
jondee86 jondee86 is offline
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Smile Re: Flickering blue light ?

Quote:
Originally Posted by Richard L View Post
I think removing the restrictor is essential.
Good call I changed the 0.5 to a 0.7 restrictor and straight away I could
see more bars lighting up on a trip to the mall. So the 0.5 was definitely
holding back some flow. I will need to make a log to see what impact this
has on W/M flow into the engine. Then I can decide if I need to change the
nozzle size.

Changing back to using a PWM signal from the ECU would mean changing
back from full sequential ignition to wasted spark to free up an AUX output.
I'd rather not do that if the flickering light is not causing any harm to the
controller.

Cheers... jondee86
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  #19  
Old 09-03-2019, 09:16 AM
Richard L Richard L is offline
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Default Re: Flickering blue light ?

No more spare PWM outputs?
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  #20  
Old 10-03-2019, 11:52 AM
jondee86 jondee86 is offline
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Question Re: Flickering blue light ?

Quote:
Originally Posted by Richard L View Post
No more spare PWM outputs?
Not at the moment, but if I revert to wasted spark ignition that will
free one up. I'll most likely give that a trial next weekend. If there is
no performance difference (and there shouldn't be) I'll run it like that
and see if it resolves the flickering light issue.

EDIT: Made a couple of logs today and after looking at them I am of
the opinion that the flickering does correspond to the pump "simmering"
due to the pump relay being intermittently triggered. And as I have a
spare non-PWM AUX output I think I shall try using that to trigger the
pump relay e.g. turn the pump ON @ 18% and OFF @ 14% IDC. This
will ensure that the pump turns ON without simmering.

The blue light and the transistor in the HSF-3 that turns on the relay
will still be twitching, but I don't think that will cause any harm ??

The only unknown and possible flaw with this plan is that the HSV may
still be twitching, and that may not be good ??

The reason for changing plans is that I only recently finished rewiring
the ignition setup for individual coils and sequential firing. I would prefer
to keep that setup if this new plan can protect the pump and relay from
the intermittent triggering.

Cheers... jondee86

Last edited by jondee86; 11-03-2019 at 10:01 AM. Reason: Got a Plan B...
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