NITROUS OXIDE ( nos / n2o ) advice forum

I have tried using 4 pulsoids (2xfuel 2xnos) on a minimax controller wired as below but they don't seem to be firing and on further investigation the minimax is only designed to fire 2, I know I need to add a ssr to the system but I'm no electrician! Do I need an ssr for each pulsoid and can anyone point me where to include them/it into the diagram below and what wire goes where?
Thanks

IF you could use an SSR (as long as it's responsive enough) this is how it should be in a wiring diagram (forgive my really poor painting skills) :

That's great just what I'm after thanks so what positions 1-4 on the relay below would go where on the new diagram?

The load (orange) goes to poles 1 & 2, power (red) goes to pole 3, and ground/earth (black) is 4

Thank you sir you have saved me a lot of headaches!

That particular SSR will NOT be suitable for your purpose, as it's an AC (alternating current device) and not a DC device.

You also need an SSR that has adequate current carrying capability, which if you want to power all 4 by one unit, needs to be in excess of 30 Amps.

Although the Pulsoids only require 30 Amps, the SSR may need to be rated at as much as 60 Amps, as it will need to handle much higher back EMF voltages than a lower rated unit could handle.

We offer a suitable SSR unit that 'might' just fire 2 pairs but to be sure it would be better to use 2 of them;
http://www.noswizard.com/nitrous-contro ... relay.html

Having said all the above, it is almost certain that you will have burned out the Pulsoid drive circuit (or at least the FETS) by trying to drive 2 pairs directly from the Minimax, so you'll need to replace it.

With the above in mind, if it has been burned out, it would probably be a cheaper and certainly a better option, to purchase one of our used Max Extremes, as they offer many more control features, are easily capable of driving 2 pairs of Pulsoids (without SSR's) AND also offer a range of ESSENTIAL safety features.

Good catch... I saw the DC on the input side thinking it was the output...

It's that personality trait (attention to detail) that has made my products the best in the world.

A trait that Im refining I assure you.

My very old FRED controller from WoN runs 2 pairs of solenoids easily and has done for many years now

Having said that its not as refined as the modern controllers but it works fine for what I need

I bet Trev is waiting for the day when I call him to say "Hey you ! That (now 20 year old) controller you sold me has broken"

Ha Ha!!
FRED is a bit of a lump compared to a Minimax or a Max Extreme but its still going and doing just what I want it to do in the MGB

Despite its age and size it still has enough connectivity to allow me to hook it up to my new MSD digital 7 ign system when i finally fit it so the MSD can tell FRED what to do ! At the moment its talking to my Mallory 6AL system as it has been for the last several years.

A mate of mine has been running one of Trevs controllers with a bank of WoN Mosfets to power 4 pairs of pulsoids for several years with no problems in his 11 second Ford F150 pickup.

Well done Trev! One day I may be calling you to buy a new controller when FRED eventually goes wrong. But i dont expect to be making that call anytime soon

Regards
Perry

I haven't had the pleasure of seeing what FRED looks like. I'd love to see a pic if you have one, perry!

Oh well good job I didn't try that ssr then, on the minimax side of things I test fired it yesterday and it triggered the pulsoids so I don't think it's damaged yet so I'll look into those Ssr's, I'd love to upgrade to the max but just can't afford it yet but it may be the only option in the long run.

You've been EXTREMELY lucky not to fry it trying to fire so much load and that's a testimony to the excess capacity that we build into all our products.

Although I appreciate that you probably can't afford a new Max Extreme, our used ones are a good deal cheaper, plus we'd take your Minimax in part exchange, to reduce the cost even more.

With a bit of luck, a used Max Extreme would work out to be a similar price to adding 2 SSR's but you'd then benefit from the HUGE range of features it offers. Obviously I'd have to see the condition of your Minimax, check our stock and do some maths, before I can give you a final figure but if I were you I'd be checking it out, before spending any money on the SSR's.

I will get the cover off the car and send a pic asap mate

Perry

BTW, I spy with my little eye...


a MiniMax!! YouTube find...

Sweet.

Being curious to see if 2 DC Ssr's would work I wired them in like the diagram below which was my interpretation of the above advice and as soon as I connected the power to posistion 1 the pulsoids activated before I even turned the controller on. Now I'm Looking at it if 1 and 2 are related then it's obviously just supplying a 12 v supply straight to the pulsoids.
I think I've got the input and output the wrong way round plus a few other errors!
I'm now thinking 3&4 are the input so orange from minimax to 3 which it is at present but 12v source which is currently on 1 should be on 4 and the blue 4 from minimax should be on 1?
Can anyone fill in the positions correctly as I'm confusing myself the more I think about it!
1. ?
2. ?
3. ?
4. ?





Thanks.

The diagram looks OK to me, I 'suspect' the SSR isn't the correct type, which could be 'totally' unsuitable or just unsuitable for being triggered by negative switching.

Thanks,

Blimey maybe my wiring skills aren't that dire then!

I only tried it as I'm racing this weekend and didn't want to use the minimax firing 4 pulsoids.

Just one question, what is the broken line representing?

That was how the pulsoids were wired as standard with the blue and orange originally from the minimax.

Would the relay I've tried be the cause of the pulsoids to trigger when 1 is connected to 12v then?