Prelude conversion project - some questions

Technical discussion on converting internal combustion to electric
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jonescg
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Re: Prelude conversion project - some questions

Post by jonescg »

Drive it to work today in stop-start traffic. No trouble whatsoever. Will keep driving it until it faults though, if at all.
I suspect a larger reservoir might help, but if it's possible she's pressing both pedals at once by accident, it would certainly feel like there's insufficient brakes.
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jonescg
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Re: Prelude conversion project - some questions

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OK it faulted on me three times this afternoon. No assistance on the brake pedal. Good news is that you can still stop, you just need to really wail on the pedal.

Yes it seems the vacuum pump is not operating regularly. I don't know if it's the vacuum sensor which is staying off once a vacuum is achieved, or if the pump itself is not functioning correctly. I have a few options to check this with jumpers etc, but I hope it's the sensor and not the pump. The pump is nearly impossible to remove without trained hamsters...
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jonescg
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Re: Prelude conversion project - some questions

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Drove the car to work this morning - no problems with the brakes at all.

I'm wondering if this is a temperature thing... It was a warm night last night, and the brake pump failed several times. This morning it worked like a treat. If it fails again this afternoon (forecast maximum of 35'C) I suspect it's a heat thing. Now the lousy solution is to somehow duct airflow past the pump, but considering we had several 41'C days in the past and the pump worked fine, makes me think the pump may be failing prematurely.

If it stops working again this evening, I will put a jumper across the sensor and see if that makes it fire up again. That would confirm the sensor is letting me down. If it still doesn't fire up, the pump is at fault, and I'll be getting some hamsters in...
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brendon_m
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Re: Prelude conversion project - some questions

Post by brendon_m »

Have you worked out if you are losing power? Or is it the pump?

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jonescg
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Re: Prelude conversion project - some questions

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I've been waiting for it to fail again. 300 km later, nothing...

I had the A/C running, and in lots of stop-start traffic figured a bit of heat would be starting to build up in the engine bay, but so far it's kept on working. I did notice the sound of the pump being a little more squeaky than before while it was hot, but it's kind of hard to hear it over all the other sounds (power steering pump, battery coolant pump, motor-inverter-charger pump, and a couple of small PC fans).
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antiscab
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Re: Prelude conversion project - some questions

Post by antiscab »

intermittent faults are the worst

given accessibility of the wiring, it probably couldn't hurt to have the vac pump run when either the brake lights are on, or the pressure sensor says so.

you won't know if it's fixed unless it stops working again :(

I also wonder if the vac pump has a high temp cut out?
Matt
2017 Renault zoe - 25'000km
2007 vectrix - 156'000km
1998 prius - needs Batt
1999 Prius - needs batt
2000 prius - has 200 x headway 38120 cells

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jonescg
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Re: Prelude conversion project - some questions

Post by jonescg »

antiscab wrote:
Fri, 27 Mar 2020, 11:16

I also wonder if the vac pump has a high temp cut out?
I have written to the Chinese vendor who stocks them asking for a wiring diagram, or an instruction manual, but nothing yet.
If heat is an issue, it's unlikely to be a problem again until December...
AEVA National Secretary, WA branch chair.

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