REVERSE
#1
Posted 19 December 2006 - 11:10 PM
With the engine running at idle when i push the reverse button the engine cuts out, probly due to voltage drop to the ecu or fuel pump.
So to overcome this i put some revs on while reversing but some times it still cuts out
also i have noticed that when it has been reversed with the engine running the ecu has a mind of its own afterwards(i mean it either wont idle or it starts to race @2/3k revs) until i switch every thing off and restart it then its back to normal.
any one had this problem ?
#2
Posted 19 December 2006 - 11:15 PM
#3
Posted 19 December 2006 - 11:34 PM
I would prefer to use one battery (600A) just for space and weightcould you use 2 batterys with some sort of a split charge system ?
what i realy need to know is the voltage drop affecting the ecu or the fuel system or the ignition system so i can put a large capacitor on the problem
#4
Posted 19 December 2006 - 11:36 PM
cant help with anything else as i'm not a Z cars owner
#5
Posted 19 December 2006 - 11:42 PM
Yes i thought a capacitor with a diode to stop the curent going backoversa capacitor was going to be my next sugestion
cant help with anything else as i'm not a Z cars owner
Maybe i should post this in the electronic section
#6
Posted 19 December 2006 - 11:45 PM
i don't think you need a diode, the capacitor discharges to fills the gaps when the voltage drops
#7
Posted 19 December 2006 - 11:53 PM
#8
Posted 20 December 2006 - 12:20 AM
As for the idling afterwards I found this only happens when there has been heavy use of the reverse or if you've been using the reverse with a host of other ancilleries (fuel pump ignition etc)
Ade
#9
Posted 20 December 2006 - 12:36 AM
Just trying to sort it so i can leave the engine running .
Its a bit of a clart on switching the engine off every time.
A mate of mine described the reverse sounding like a tram, with the ding then the wirrrr lol
#10
Posted 20 December 2006 - 08:20 PM
Pete
#11
Posted 21 December 2006 - 05:30 AM
Pete is yours injected ?I believe the ecu will cut out below a certain voltage. When I first built mine with a fully charged battery it would go backwards with the engine running. Then after a while it stopped doing it. Haven't had any idleing problems yet but I am using quite a big car battery.
Pete
I have 600ah battery. I wired mine so you have to have the ignition on for reverse to work and i have noticed sometimes it will not start after reversing unless i turn the ignition off then back on.(ecu reset) So i figure that i need to keep the voltage maintained for the ecu.
Hence a large capacitor with a diode. A large capacitor will store the voltage and a diode will stop current traveling away from the ecu a bit like a none return valve.
Going to get the bits today to experiment
koss
#12
Posted 21 December 2006 - 09:40 PM
Pete
#13
Posted 21 December 2006 - 10:43 PM
Any way i have sorted a capacitor, a big one its the same size as a can of beer, i think it will do the job, it might mean i can go back to the standard mini battery.
Its getting close to crimbo so i will not know if its going to work for a few days yet.
should do i hope :'(
#14
Posted 25 December 2006 - 12:39 PM
we find that the red top varley 30 cures this as they have such a big reserve of power that the volts dont drop off and the engine keeps running
i would be interested to see how your little mod goes though and what does it cost
a battery from us is £105 plus vat so it may be still cheaper to fit one big capacity battery if you havent already got one for the project
chris
#15
Posted 26 December 2006 - 01:18 AM
I will be experimenting with this in a few days, my theory is, three main circuits.
Engine management, ignition and fuel injection all running the engine.
The first problem i noticed when using reverse was that it cut out. If it didnt cut out it started running strange afterwards, so i think the voltage drop is effecting the ecu as it returns to normal running after a reset.
It may also be as you say, the voltage to the coils or the fuel system. So i will start with the ecu first and if need be do the same to the other circuits
Capacitors are fairly cheap and i like experimenting. Just thinking of solenoid gear changers etc.
I will post the results
Cheers Ian
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