RPM Trigger switch

[claymore]

Ok, I'm trying to set up a 2 stage boost system, I thought I had it sussed, but I'm afraid not, what I need is some means of triggering a solenoid when the engine hits a certain rpm, I tried to use a shift light to do it but it doesn't have the power to switch the relay, so over to you lot, put your thinking caps on.

[M-R-P]

Small photocell to detect the shift light?

only joking

relay off the shift light to switch the solenoid directly from the battery

[claymore]

Small photocell to detect the shift light?

only joking

relay off the shift light to switch the solenoid directly from the battery

Yep, that's what i did, but it won't power the relay even

[oblark]

Custom map

[stribo]

Would an EBC not do what you want?

[claymore]

Custom map

No, I just want a nice simple mechanical system, that others can copy if they want, I can get it to work fine via a press button, so I can use it on the quarter mile, put I would prefer to have it automatically trigger at 4500rpm.

[JamesT5]

What about some sort of spring loaded system.

[Jamest5r]

Custom map

Would an EBC not do what you want?

He could fairly easily with.the TT and a bcs, Colin don't do things normally lol

[Wobbly Dave]

This is what I bought the Blitz SBC for, although at the moment I am only running 1 set value. The blitz allows either speed or rpm based boost control.

[claymore]

Sorted I think, I'll use this relay (triggered off the shift light)to trigger the bigger relay:

http://www.ebay.co.uk/itm/Relay-boar...item338dc4e2bb

[stribo]

Sorted I think, I'll use this relay (triggered off the shift light)to trigger the bigger relay:

http://www.ebay.co.uk/itm/Relay-boar...item338dc4e2bb

So you're going to get the shift light to trigger a relay, to trigger a relay, to trigger a solenoid, glad you're keeping it simple.

[theflyingbrick]

see this is why I love colin and his antics,obviously ive nothing against the ones who buy their kit already made to do what they want,but I just love the fact that he says (in a Michael caine accent) hold on lads....ive got an idea, and hey presto,you have a "working mans" version of something that would probably impress people more than seeing a pre built item!! ive said it before but colin you are an inspiration to all and I look forward to one day meeting you and shaking you firmly by the hand

[claymore]

So you're going to get the shift light to trigger a relay, to trigger a relay, to trigger a solenoid, glad you're keeping it simple.

i recon I can get a working system for less than £40, I have a greddy ebc, but I didn't like the way it modulated the boost, and it needs a degree in science to set the bloody thing up...lol

[stribo]

see this is why I love colin and his antics,obviously ive nothing against the ones who buy their kit already made to do what they want,but I just love the fact that he says (in a Michael caine accent) hold on lads....ive got an idea, and hey presto,you have a "working mans" version of something that would probably impress people more than seeing a pre built item!! ive said it before but colin you are an inspiration to all and I look forward to one day meeting you and shaking you firmly by the hand

Michael Caine was dangling off the edge of a ledge though, Colin does it because he likes making work for himself. They both look good in a bowler though.

He was at the RR day in Uxbridge, did you not see him?

[stribo]

i recon I can get a working system for less than £40, I have a greddy ebc, but I didn't like the way it modulated the boost, and it needs a degree in science to set the bloody thing up...lol

Says the man who has not only supercharged his turbocharged Volvo, but is now fitting an engine in the back.

[theflyingbrick]

Michael Caine was dangling off the edge of a ledge though, Colin does it because he likes making work for himself. They both look good in a bowler though.

He was at the RR day in Uxbridge, did you not see him?

nah I got there late

[Dangerous Dave]

You want a simple transistor circuit Colin. It will take the small signal of the shift light and operate the relay.

Something along the lines of this.


You can pick up the components from Maplins cheap enough (no more than £4, and Maplins are expensive!)

That or a custom map like Oblark says

[jamesy12345]

Colin, on my nitrous kit is a micro-switch set to activate at WOT. You can just see it on behind the pulley for the accelerator cable. Not what you asked I know but bear with me...



A bit crude so the nitrous kit makers came up with something that detects throttle position from the TPS:

http://www.nitrousexpress.com/oldweb..._autolearn.pdf

Now the more advanced systems have RPM switches also:

http://www.msdignition.com/Products/...ed_Switch.aspx

http://www.zublin.com/nosrpmswitch/900011-002-A.pdf

Maybe one of the above could be used?

The more expensive nitrous controllers have that fuction also. Related to this, on my car I have a boost switch, at the moment set to deactivate the nitrous at 7 psi



DIY RPM switch below....

http://www.rx7club.com/2nd-gen-archi...ts-vdi-233381/

[MoleT-5R]

You want a simple transistor circuit Colin. It will take the small signal of the shift light and operate the relay.

Something along the lines of this.


You can pick up the components from Maplins cheap enough (no more than £4, and Maplins are expensive!)

That or a custom map like Oblark says

beaten to it, this is a nice simple way to trigger the relay from the shift lights low power output, a few minutes with a soldering iron and it will be sorted, Colin