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Old 17-03-2019, 09:31 AM
Richard L Richard L is offline
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Join Date: Oct 2003
Location: England
Posts: 4,936
Default Re: Flickering blue light ?

Quote:
Originally Posted by jondee86 View Post
27-02-19 existing setting as base. Injection initiates ~ 14% IDC. Flickering.
28-02-19 plus 1/2 click on THRES. Injection initiates ~ 17% IDC. No change.
01-03-19 plus 1 click on THRES. Injection initiates ~ TBA. Test deferred.

Deferred raising THRES as I need to get on the motorway to monitor MAT
vs IDC at constant speed. Will do that when I get a chance. But I did have
a short drive to try a few different settings of WL and WH. Tried them both
at 12 o'clock and then with WL full ACW and WH full CW... neither affected
the flickering, but did change the failsafe behavior.

My log shows that the system is becoming active (showing flowmeter output) at IDC levels below the nominal 17% IDC initiate THRES setting. In several
places I can see flowmeter output values of 1, 2 or 3 continuously for periods
when the IDC is at 13-14%, particularly when the throttle is being gradually
opened. With more rapid opening of the throttle the flowmeter indicates a
"clean" turn on and a clean cutoff at around 17-18% IDC.

This suggests that the pump turns on before the FAV becomes active, and
that "leakage" past the valve is ocurring ? Does the pump have some
hysterisis to make sure it is up to speed by the time the FAV initiates ?
In the region of 12-14%, hysteresis is as as effective as the incoming IDC signal sampling rate is slow. Solution: use your ECU to output a PWM signal at 200Hz or more. We have now gone full circle.

Quote:
Originally Posted by jondee86 View Post
I also noted that the water level light is illuminating for around 3 seconds
pretty much every time I apply a decent amount of throttle to initiate spray.
But I can't tell if the onset of spray is delayed until the light goes out ?

If it helps, the only thing I haven't done that may be pertinent, is add the
solder blob to change the flowmeter resolution. I am running two jets
(1 x 0.7 and 1 x0.4B) with the 380cc/min FAV restrictor.

Cheers... jondee86
Does your dash gauge have two yellow leds so to distinguish between water level and failsafe trigger? You also need to reduce the WL (CCW) to avoid failsafe triggering.

Worth linking 1&2 on the flow table as it will give your a better resolution in you low operation range.
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