Snow Performance Methanol problem

It is simple enough if you can wire a relay.

The logic is that when the engine has boost pressure, the power for the methanol pump turns on. That means the relay is wired to where the contacts are normally open unless the relay coil is energized. When the relay coil energizes because the engine is developing boost, the contacts for the methanol pump close and power goes to the methanol pump.

Now that we have the logic, it is time to wire the circuit. You need a single pole, double throw relay or a single pole, single throw relay & a Hobbs pressure switch. The part numbers for the Hobbs switch listed is set to close the contacts at 4 PSI. Use the attached link to choose a switch with a different pressure turn on point. Hobbs switch information: http://content.honeywell.com/sensing/hss/hobbscorp/P3_6.pdf . You will need the Adobe Acrobat viewer which is also a free download – http://www.adobe.com/products/acrobat/readstep2.html. Do a Google search on Hobbs & the part number if you want a different switch turn on point.

The Hobbs switch is installed so that it reads manifold pressure. Plumb a line from any good spot between the blower and the intake manifold to the Hobbs switch to enable it to sense when the blower pressure exceeds the set point.

One side of the Hobbs switch is wired to ground. You wire one side of the relay coil to the other side of the Hobbs switch. The other side of the relay coil is wired to the red/green wire on the ignition coil. Any other switched power source will be OK. Cut the methanol pump power feed and wire one side up to the relay middle or swing contact. Wire the other side of methanol pump to the normally open relay contact. The only time the relay coil will energize is when you have boost. When the boost is created, the relay closes, the power for the methanol pump turns on and stays on only as long as the boost remains.

Parts list
Hobbs switch
Barry Grant NitrousWorks #16006
or
http://www.aircraftspruce.com/catalog/inpages/hobbsswitch.php
$23.00

Relay: see your local auto parts store for a 12 volt 30 amp SPDT relay or see Radio Shack for a 12VDC/30A SPST Automotive Relay, Radio Shack P/N 275-226, $6.49. Either one will work.

No boost, no methanol pump power sounds like it should be the solution to your problem. This overrides any existing controller you already have installed. I must be missing something...

Here's more of an answer to your original question. You want a 555 ic that drives a a relay. A 555 is a little 8 pin IC that is made to do time delay tasks. A resistor and cap are all you need to adjust the time dely in most cases.

Do a google search on 555 delay timer

Here's one of the many site sthat came up...
http://www.williamson-labs.com/555-circuits.htm

Remove the forced induction and send it to me: Problem solved