I have a 03 gmc sierra 5.3...does any one know wich wire on the tb is for the wot...and wich wire on the wot activated nitrous system needs to be spliced in too it. And what is a good plug to run on a 75 dry shot....

 

These questions show me you need to do a lot of research before you istall a nitrous kit. Especialy a dry kit.

What kit do you have, what controller are you using. A quick search would have answered these questions and that is why I am guessing you need to learn a lot more about nitrous before spraying.

 

Don't listen to above comment.

First off I'm not sure which wire you can use to tap into for the TPS for your controller. I just use a WOT switch under the pedal that in turn sends power to a button on my shift **** (5speed trans). A little shot like a 75 I'd run NGK TR6's. Some may tell you a stock plug is fine, and some may tell you to use a non-projected tip plug like a BR6, but the TR6's are proven and fine for a shot of that size. Mount the nozzle before the MAF, don't spray below 3000 RPM and go have fun.

 

You can't use the TPS to get a wide open signal. At least I have never seen anyone do so and don't see anyway to make it work.

I agree stock plugs should be OK but you would be dumb to not spend less then $20 on a set of TR6 plugs.

Why would you ever tell someone to not listen to a comment that is sound advice. The questions that were asked were extremely simple and don't all make sense. There is no wire on the TB for WOT. That is why all kits come with one.

He also is implying he plans to spray at WOT going against your 3000 rpm advice. That tells me he doesn't yet know that it isn't a good idea to spray below 3000 rpm since he is asking questions about a "wot activated system."

Maybe he knows plenty but I think that is up to him to decide and not you.

 

You actually can get a wide open throttle signal from the TPS. Most window/wot switches use the 5 volt signal as a reference to determine wide open throttle. My nitrous switch uses a signal from the TPS (purple wire I believe) as well as a coil ground wire for the RPM window activation. My system won't activate until the engine is at 3000 RPM AND Wide Open Throttle. This type of switch is the safest way to go in my opinion.

It sounds to me like you are looking into a Zex kit. They seem to pride themselves on a three wire install. Power, Ground and a TPS signal. Although their system uses a TPS signal to activate the system only at WOT, it is never recommended to spray under 3000 rpm. If you decide to go with this system you can still use a WOT/Window switch with it. I got mine from Nitrous Outlet, one of the sponsors. it's a great piece. Their newest switch actually has a lean cut out feature that monitors air fuel ratio via a wideband input. Harris Speed works also has the same features in their microedge controller.

NGK TR6's are worth the upgrade. An easy 20 bucks or so. People have sprayed on stock plugs, but for the money it isn't worth the problems it can help prevent.

 

I agree stock plugs should be OK but you would be dumb to not spend less then $20 on a set of TR6 plugs.

custm2500: you have no idea how many time ive been thinking that about you, that your dumb for not wanting to upgrade to better brakes instead of taking them off, or buy a throttle body instead of spending a couple more dollars and be safe etc etc .[/QUOTE]

back to the question from too slow: The green wire on your throttlebody is the tps wire that you will hook the wot wire too. thats the one is used on my silverado 2005, not sure if its the same on your truck, im sure somebody will know...

 

As stated above.

If you are asking about a WOT TPS wire it is probably because you have some sort of TAPS switch weather it be a Window, Progressive or just TAPS switch instead of a micro switch.

If that is the case it will be the Purple or green wire on the connector that goes to your TB. It varies depending on model year.

The TR6's should be OK for 75 but you should consider a non-projected plug like the B6EFS(one step colder - same as TR6 but non-projected) or colder if you plan on spraying anything more later.

BR7EF(2 steps colder)
B8EFS(3 steps colder)
B9EFS(4 steps colder)

All companies recommend not spraying below 3000 rpm so if you are not using a Window switch then use a hand switch to activate the N20 after 3K.

 

Well a friend gave me his zex kit and said have fun...it is a wot operated system but I can't find a model number on the thing...I do know he called it a "safe" kit. It will only spray 75...thanks for all the advice and custm2500 I'm doing my research now.

 

You can never learn too much and we all want everyone to have fun but nobody has fun blowing up there motor the first time they spray.

I figured with a controller you can use the TPS to get a signal but you can't use it for a WOT switch can you?

 

A TPS measures throttle position, WOT is a throttle position. Why would it measure 0-99% and not 100%...