No accusump on road use.

[Ultima IT]

Ciao everybody!

I have a strange question:

"Usually our cars are used on the track, I will always use it on the road, I really need an accusump???"

This question is why I found it in my accusump the cable DISCONNECTED!

At this point it is advisable to remove it directly! Not?

[Steve_D]

For road use you probably don't need one.
If you already have one fitted then I would get it working again.
A google search should find you all the instructions as to how it should be wired and used.

When working it will fill with oil at working pressure. When you turn the car off that oil remains trapped in the Accusump.
When you go to start the car next time turn on the ignition and wait a while to let the Accusump push oil into the engine so you have oil in the bearing as soon as you start the engine.

Steve

[Ultima IT]

Thank you for your authoritative answer Steve!

[GTRMikie]

I don't have an Accusump or an oil cooler, but then I only have 355hp!

[renmure]

I think I have both, but they are somewhere in the noisy oily bit at the back behind the seats

To be fair, I like seeing the oil pressure going up before pushing the starter button.

[F.C.]

GTRMikie said:

I don't have an Accusump or an oil cooler, but then I only have 355hp!

It's not the power its the G force you can still spin a bearing with 5BHP if you corner long enough and starve the oil pick up!

[Ultima IT]

Please, can someone help me?

This:



Need to be connected to this? :



Another question:
With accusump disconnected I can discharge oil inside: connecting a negative to accusump ground and a 12v positive on valve wire! Right? (Logically : accusump tend to fly away like a missle)

[BobE]

The Accusump has a 12V supply when the ignition is turned on. This power goes to the solenoid valve and then goes to earth/ground through the oil pressure warning switch. The oil pressure switch is closed when there is zero oil pressure and then goes open circuit when oil pressure builds beyond a few psi. So when you first turn on the ignition the Accusump will force oil under pressure into the engines lubrication system. When the engine starts and oil pressure builds the oil pressure switch goes open circuit and the solenoid valve closes. Oil pressure will then build in the Accusump cylinder as the valve acts a type of check valve. If the oil pressure reduces due to oil surge under braking or cornering such that the oil pressure switch closes the solenoid valve opens again and allows oil to flow from the Accusump cylinder into the engines oil system. Several things can go wrong with the system. The contacts in the oil pressure switch can burn out as they aren't designed to take the level of current from the solenoid. The O-rings on the piston in the Accusump cylinder can get damaged and the air pressure is then lost on the piston side away from the engine. If this happens the cylinder can become full of oil which can then expand once the engine ignition is turned off and heat soak occurs. If this happens the pressure relief valve will then operate and spray oil around the engine bay. I hope this helps.

[Ultima IT]

Thank you for the reply Bob.

Something in my Ultima don't match...........

OR pressure switch is the wrong one (needed the two pole one).

OR accusump wire/valve is wrong (needed the two pin connector)

[BobE]

Ultima IT said:

Thank you for the reply Bob.

Something in my Ultima don't match...........

OR pressure switch is the wrong one (needed the two pole one).

OR accusump wire/valve is wrong (needed the two pin connector)

I don't have a wiring diagram for the car but my oil pressure warning switch only has a single connection so the warning lamp and Accusump circuits must both earth through a single wire to the switch. I think the solenoid valve has three wires.
Does anyone have a full wiring diagram? The build CD only has the colour of the wires that connect to various items and a rough schematic of the loom - but none of this allows you see how the whole car system is wired.
I also forgot to mention that over time the safety valve on the Accusump can also start to operate at a much lower pressure which can lead to oil being sprayed around the engine bay after you turn the engine off and heat soak occurs.

[BobE]

I found this link which may help:
http://download1592.mediafire.com/jqcfip25x8xg/a4r...

[Steve_D]

My Accusump is only wired to the ignition circuit so does not use a pressure switch.

It opens when you switch the ignition on and empties before I start the engine.
Whilst running the Accusump will refill and stay at the same pressure as the rest of the oil system.
If the pressure drops slowly the Accusump pressure will do the same.
If it drops suddenly the Accusump will empty into the system.

If I can, I hold the revs up a little as I switch the ignition off to maintain the best pressure.

My wiring is just the ignition supply and an earth.

Steve

[Ultima IT]

BobE said:

I found this link which may help:
http://download1592.mediafire.com/jqcfip25x8xg/a4r...

Thank you so mutch mate!

Is usefull!!!!!

My Ultima Lego instructions CD is version V2.03 ( It probably means 2003 )
and it's a bit naughty:
put together pannels,
mount engine
assemble weels and body
engine start

Steve_D said:

My Accusump is only wired to the ignition circuit so does not use a pressure switch.

It opens when you switch the ignition on and empties before I start the engine.
Whilst running the Accusump will refill and stay at the same pressure as the rest of the oil system.
If the pressure drops slowly the Accusump pressure will do the same.
If it drops suddenly the Accusump will empty into the system.

If I can, I hold the revs up a little as I switch the ignition off to maintain the best pressure.

My wiring is just the ignition supply and an earth.

Steve

In this way there is oil pressure delay when engine revs up?!?!

[Steve_D]

Ultima IT said:

......

Steve_D said:

My Accusump is only wired to the ignition circuit so does not use a pressure switch.

It opens when you switch the ignition on and empties before I start the engine.
Whilst running the Accusump will refill and stay at the same pressure as the rest of the oil system.
If the pressure drops slowly the Accusump pressure will do the same.
If it drops suddenly the Accusump will empty into the system.

If I can, I hold the revs up a little as I switch the ignition off to maintain the best pressure.

My wiring is just the ignition supply and an earth.

Steve

In this way there is oil pressure delay when engine revs up?!?!

Do you mean that the Accusump will be empty when you start the engine and will take a while to fill and bring up the pressure?
If so then yes that is the case and will be true if a pressure switch is in the system.

In both cases the valve will open when you switch on the ignition which is what you want as it pre-oils the bearings.
When you start the engine the pressure will build and will close the oil pressure switch fairly early and the valve will close. However, the design of the valve is such that oil can not exit but it will still fill with the oil pushing past the closed valve. This is by design.

Steve

[BogBeast]

Ultima IT said:

..
and it's a bit naughty:
put together pannels,
mount engine
assemble weels and body
engine start
..

That. is all part of the fun

[845ste]

.....but the previous owner does he say?