DIY Smoke Switch for 1998.5 - 2000 24V CTD's - Dodge Cummins Diesel Forum
98.5-02 Aftermarket Performance This is the 1998.5 to 2002 Dodge Cummins AfterMarket Performance Articles Section. Chips, Tuners, Intakes, Exhaust, etc...

 
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post #1 of 8 (permalink) Old 01-10-2009, 10:09 AM Thread Starter
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DIY Smoke Switch for 1998.5 - 2000 24V CTD's

Okay folks, I was helping another guy out that wanted to do a smoke switch, but he didn't know how to do it.

After a ton of searching, I couldn't find a good write up or DIY for the 1998.5 - 2000 CTD, which has a different MAP sensor layout then the 2001 - 2002 24V's.

So, after a little bit of research and a little bit of math, here is what you need to do to do a smoke switch on an early 24V CTD.

NOW, you MUST have a boost fooler, Edge Comp, Quadzilla Adrenaline or other boost fooling type box for this to work. If not, the engine gets a dead pedal condition, as it defuels for safety and it defeats the purpose. So if you don't have a box or other boost fooler, this WILL NOT work for you.

The items you need for this mod are cheap and easy. You need a 2 pole on/off switch, a 10 or 33 ohm resistor, a few feet of 18 or 19 gauge wiring, 2 wire taps or your choice, and 2 spade connectors to connect to the switch you are using. Total of maybe $10 - $15.

Here is what you need to do....

First, let's identify what's different on the 1998.5 - 2000 CTD MAP sensor. All it is, is the shape of the plug and the wire layout. The early 24V's have a round / triangulat shaped connector on the MAP sensor that looks like this:




The wires that are associated with this sensor are like this:




Now, lets look at how this gets laid out....

You have your map sensor and the wiring that comes out of it and the switch that gets mounted in the cab.

What you need to do is tap into the (A) and (C) wires and run those wires to the switch. What this does is send a FULL BOOST signal to the ECM and this allows it to dump fuel.




BUT, this WILL trip your CEL if it's left on for too long. You'll get a code for Boost Too High For Too Long. This code is a soft code and will go away after a few start cycles and it will not put the truck into limp mode or anything like that.

So, what we need to do is add the resistor, to tell the ECM that we are getting ALMOST full boost and this prevents the CEL from coming on. This is where the 10 or 33 ohm resistor comes into play. The lower the ohms, the higher the signal that gets sent to the ECM, the more boost that it sees.

It needs to get wired into either one of the wires the are running to the switch, it doesn't matter which one you use.




Once these connections are made and you hit the switch, the truck will dump full fuel at low boost and you can turn day into night on command.

Just be careful using it and watch your EGT's, as they will come up quickly.

Again, you MUST have a boost fooling device to do this, otherwise the truck just defuels and it defeats the purpose.

Enjoy!



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post #2 of 8 (permalink) Old 01-16-2009, 08:58 PM
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just a thought.. but couldnt you use a variable resistor in place of the switch and resistor. a variable resistor that can we switched back to say an off position. just a thought. as like a variation from this.
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post #3 of 8 (permalink) Old 01-16-2009, 09:57 PM
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I was wondering if it would hurt anything if you were driving up the road and turn the switch on.

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post #4 of 8 (permalink) Old 01-16-2009, 10:29 PM
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it probably wouldnt hurt anything. it would just really quickly think it was getting full boost.
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post #5 of 8 (permalink) Old 01-16-2009, 10:31 PM
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getchya lots of sooot! rip the switch and watch it roll baby!

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post #6 of 8 (permalink) Old 01-16-2009, 10:33 PM
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hell yes! mooorrrreeeee soooootttttt!!!!!!!!!
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post #7 of 8 (permalink) Old 01-17-2009, 04:09 AM
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Can this be done on a 2002? Is an Edge EZ a boost fooling device?

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post #8 of 8 (permalink) Old 02-02-2009, 09:21 PM Thread Starter
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Here's a small addition for those that are running a boost fooler or stand alone box.

You must bypass those devices and send a signal strait to the ECM from the MAP.

Otherwise, you're fooling device actually LOWERS the signal to the ECM and this defeats the purpose of the switch.



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