Outer Limits 4x4 Board

anyone know of a relay/timer 12v that will upon losing input signal stay latched on for a few seconds then turn off, want to try something like this for my supercharger setup so i can keep boost on gear changes.



Craig

What's wrong with an off the shelf blow off valve?

Scott

on my setup blow-off valve will serve absolutely no purpose, I want to get around a little idiosyncrasy in my computer. I can set the computer/supercharger setup up differently but this in itself has other minor problems.

you will be able to get a commercial version from an electrical wholesaler who deals in industrial control stuff. Most of the common units are multy purpose and multi voltage - and will do what you want.....

or if you are good with a soldering iron, jaycar, dickheads, or altronics sell car interior light delay kits - you could use one of these, (modded for less delay).


Also - as Scott said, WTF are you doing ? more details, interesting.

was thinking along the lines of one of those interior delay kits, just gotta get off my arse and have a good think about how to do it, just thought i'd ask on here first.

as for what i am doing with it I, just want to delay the turn off of my. s.c clutch.

Ive seen a relay timer fitted to New Holland front deck lawn mowers. Its fitted to the fuel cut solenoid. If you lift your bum off the seat for more than 2 seconds it cuts out.

It uses the usual 5 pins base

last time I priced an interior light delay relay it was about $130

Tom

If you're handy with a soldering iron and have a bit of electronics knowledge you could whip up a circuit based on a 555 timer chip.

murcod wrote:If you're handy with a soldering iron and have a bit of electronics knowledge you could whip up a circuit based on a 555 timer chip.

You could probably buy a pre-packaged kit from Dick Smith or Jaycar, which will do precisely what you want. I'd guess $10 to $20.

Alternatively, can you disable the cut-out and rely on a BOV instead?

Good luck,

Scott

NJ SWB wrote:

murcod wrote:If you're handy with a soldering iron and have a bit of electronics knowledge you could whip up a circuit based on a 555 timer chip.

You could probably buy a pre-packaged kit from Dick Smith or Jaycar, which will do precisely what you want. I'd guess $10 to $20.

Alternatively, can you disable the cut-out and rely on a BOV instead?

Good luck,

Scott

have thought of designing a 555 timer,

BOV will not achieve anything as stated before, i already run a compressor bypass valve, but that has no bearing on what i want the timer for.

Not suggesting you buy this one, but you could cannibalise one from a pick-a-part:

http://cgi.ebay.com.au/VW-INTERIOR-LIGH ... dZViewItem

The delay unit will be in there somewhere!

Alternatively the jaycar kit is $18.95. It includes a "fade-out" feature, which you wouldn't want. Not being familiar with the kit I couldn't say what bit you need to leave off, but it would be pretty easy I am sure.

Another option - a glow plug relay. I am not sure how long you want the clutch to stay on for, but glow plug relays usually run about 15 seconds I think... too much?

Or, just from a random web search: http://www.lazer.com.au/alarms.shtml and scroll down to the "universal timer". $22, already assembled it seems.

Good luck.

Jason

cplux wrote:have thought of designing a 555 timer,

BOV will not achieve anything as stated before, i already run a compressor bypass valve, but that has no bearing on what i want the timer for.

We get that you don't want to use the BOV now, but we are still interested in more detail on the computer issue and your objective

ausoops wrote:http://www.aluminio.com/a4141.htm

pretty much what i'm after i think bit exxy though

cplux wrote:

ausoops wrote:http://www.aluminio.com/a4141.htm

pretty much what i'm after i think bit exxy though

Bit exxy alright, for that price i could build you a micro processor controlled unit with an rs232 interface, and i'd even throw in gps tracking

If the delay time is critical, don't go for stuff like the 555 or the one from the above link. They will drift with temp and age. Look for a crystal based unit (temp drift is only a few parts per million)

Why not just wire the clutch on permanent ?

not going to go into too much detail it is a completely custom setup, but the clutch does serve a purpose on my particulay setup, have tried having the clutch permanent but it has affects on a few other things.

thanks for the input

Can you clarify exactly what you are trying to do?

Ie. when you want power, when not and for how long. I should be able to booty fab something for a couple of $

Try jaycar or dick smith. It's a circut call a flexitimer. Comes in kit form. Fully adjustable. Will do what you want and more. Just a matter of connected in up with the car.


Rob

Curious your asking others to "share" their knowledge and info but aren't willing to do the same????