I called Tim today to ask if the Zex nitrous kit had a built in window switch. He told me that he had never heard of a window switch He then said he doesnt know what it is and that I wouldnt need one In a way he is right, but it was just funny to hear someone tell me I didnt need one when they didnt even know what it was So now I know Ive got an auto, but when I run my street tires my truck usually nails the rev limiter on the 1-2 shift. Dont know why this is happening, but I do know that my truck will go boom if I hit the limiter with the juice flowin. So does the zex system have a built in window switch that you can program?? He told me that the nitrous kicks in as soon as you go WOT. But from what I understand its a very bad thing to spray below 3000rpms do to low air speed in the intake(nitrous puddling) So does it kick on at a certain rpm and shut off a certain rpm at WOT?

Thanks

Sean

 

Only if you shoot too much then it will put a nice window in the block

 

whats a window switch?

I think plenty of people shoot nitriuos right at WOT, i think for this particular application it's ok, and you won't encounter puddleling. Remember that compressing air generates quite a bit of heat, i doubt that nitrious will last long in the liquid form.

 

DONT Juice it
Until that Limiter is moved waaaaaaaaaaaay up,
or you will blow it.

No Zex does not come with a window switch,
and you really DO NOT need one.
( even know I don't know what it is )
http://www.centuryperformance.com/ma...wRPMSwitch.pdf

The Zex Kit has it all figured out, dont you worry bout that.
I got mine from REM, it works flawlessly.
It does not use a Button, or Mirco Switch, it's triggered by
a signal it gets form our TPS (throttle postion switch)
It can only Spray when it picks up a predetermained voltage
signal from the TPS, there is NO NEED FOR ADJUSTING,
they have it all figured out for you.

With a good set of slicks, at a good preped track,
Yes it will take FULL WOT and launch like a Mo Fo
It'll also take up to a full second off your ET,
depending on your mods and setup

See the purple wire going to the TPS
right to the left of the Throttle Body


Your tuner MUST burn you a Nitrous Program,
it will have a lower timing, a richer A/F, shift points @ 5250,
and the Limiter will be taken waaaaaaaaay out of the picture.
Mine is 6K or higher.

 

Thanks for the detailed reply rob On the slicks Im sure it wont be a problem since Ive never spun the tires on on the 1-2 shift with them. My only concern would be spraying on the street tires. Just about everytime I nail it in first on the street tires the truck will pop before it shifts into second(spinning all the way through first into second). It sounds like it is banging the rev limiter, but maybe its something else. Ive already had my rev limiter raised to 5950rpms and my 1-2 shift is set at 5300rpms.

A few more questions for you on your nitrous tune Rob. Ive got a race gas setting that was set up with 18 degrees of timing and an A/f of 12.2. Do you think I could run that and the nitrous with race gas?? If not Ive got another setting with 14 degrees timing and and A/F of 11.7. I only want to spray a 50 shot. And Ive always been told that you should only have to retard you timing for a 100 shot and above. Im running 12.0 and I just want to break into the 11's. Its been my goal with the truck and I cant think of cheaper way to get me there solidly.

And I thought I remember reading that you have never had your truck on the dyno before Rob. I wouldnt be able to take my truck back to my tuner with the juice. He didnt even want to tune my truck with the KB. He said that I was going to blow my engine up(so I sold the KB). I could just tell him that Ive got a built bottom end? So do I really nead to retune the truck after the nitrous? Does it through off you A/fs that much? I was hoping that the Zex kit would run a bit rich on the bottle and I wouldnt have to worry about that.

Are there anyother special pieces I need to finish the kit right? Bottle heater, spray plate, and Zex kit is my list so far. Oh yeah you cant forget the purge Sorry for all the questions Rob, but your the man when it comes to the juice

thanks

Sean

 

Rob....the nitrous guru.

 

Wow, lots of bad advice here. Sorry, I just can't beleive that some of you 'nitrous guys' haven't heard of or don't use a window switch, its not very smart...its crazy! Spraying at low rpms (even with the throttle wide open) is VERY bad and VERY dangerous. Don't call REM, call the nitrous manufacturer themselves or go to the track and find some real experts with big nitrous systems for advice. You absolutely need one, without it you're running on egg shells...good luck.

 

N2O isnt one of those things you should be guessing at.
Never spray under low load or low RPMs.There is lot that you need to know when running nitrous. Make sure you're getting the correct info from people who actually know.

 

When I had my Mustang I used to use the Jacobs Nitrous Mastermind. You could adjust partial on rpm, full on rpm, cut off rpm (rev limit) and the amount of timing retard. It won't work in our trucks because of the ignition system, but rscoleman is right.

 

could'nt have said it better even if you have a button to activate a stage by hand.. you BETTER have a window switch...

tell you what... go to the HALO forum, send "AVDAWG" a message, ask him what happened when he decided to run his L and big nitrous setup WITHOUT a window switch... (he wanted to run bad, didnt have one available to use, took a chance)

NITROUS IS NOT TO BE GUESSED AT, UNLESS YOU ARE READY TO REBUILD.

 

Sean,

Keith and Paul were not here when you called. Just because I didn't know what a window switch was, doesn't mean that they didn't know what it was.

They both certainly do.

At any rate, good luck with your kit, wherever you get it.

 

Since I'm being fried here I guess I should respond

I have been spraying for well over 20 years on everything from Motorcycles to assorted Big Block Chevelles, and now the Lightning for a year.
AND HAVE NEVER HURT OR BROKEN A PART as a result.
So YES I consider myself to know about Juice.
HOW LONG HAVE YOU BEEN SPRAYING ???
We are not talking about massive Nitrous Systems here guys, we are talking about 50-75 shots in most cases.

Do I agree that on a 6 sec race cars with multi stage Nitrous systems you need a Window Switch, YES I DO, but I grrnty that if you ask every Lightning Nitrous user if they are using a window switch on a 50 shot, 99.9% will say NO.


As for spraying at low RPM's, yes that is a NO NO, but like I say,
the Zex System has that figured out. Although yes it is activated by a voltage signal it recieves from the TPS, it is delivered in the proper manner to assure no early spraying.

rACeRs
To answer your other question, I'm at work right now, but have a chart at home explaining the timing.

Your right I have NEVER Dyno'd and I'm not afraid of Spraying because of that. I run it rich, I use 2 zones colder plugs, I have
a Multi Spark Ignition to disipate more heat in the Cylinders, and I threw the NGK's in the garbage and use only Denso's.

Oh BTW
I also took off a full second off my ET,
with no Tranny, Suspension, Exhuast, or Cooling Mods AT ALL

But what do I know, I give bad advise

 

Lunch Time

rACeRs


I have the Zex #82021 Kit 55/65/75 HP
and here's that Tuning Chart

-----------------55HP-------------65HP---------------75HP
Nitrous Jet-------32-----------------36-----------------40
Fuel Jet----------17-----------------19-----------------21
Timing Retard----0-------------------2------------------4



Zex #82023 Kit 75/100/125 HP

-----------------75HP------------100HP--------------125HP
Nitrous Jet-------40-----------------46------------------54
Fuel Jet----------26-----------------30-----------------34
Timing Retard----0-------------------2------------------4

They seem to run it much richer on the bigger kit,
even know the 75HP Combo uses the same Nitrous Jet.
And BTW there is no diff at all between the two kits,
other than the Jet Kit you get with it.

As for timing, I'll tell you a little story, my FORMER tuner also refused to tune for me once I got juice.
(some people are just scaddy cats when it comes to Juice)
So I went to JLP and he hooked me up, at first we tried low timing "like they recommended" and it ran like ****, I then tried my OLD gasoline program (I have a spare chip) and WAM it ran great. Had Johnny burn me a new Nitrous Program at 16 degrees and the rest is History. I also have a 18 degree program, but I havent tried that yet, thats what I drive the streets on 24/7.

So far all my ET's are with the 16 degree program.
I will try the 18 degree program eventually, but I'll back down to 4lbs of extra Pulley for that. Your 14 degree program will be fine to start with

As for extra's, Heater is a Must
Most have a purge, I just purge it on the way to the track
Some like a Automatic Bottle Opener, but I don't have one
AND YES BUY THE PSP NITROUS PLATE

ALL THE PIC's in my Gallery (Mod Folder)
Click my Pic

 

From :
ARERACING@aol.com

To :
ROB3832@HOTMAIL.COM

Subject :
NITROUS

Date :
Wed, 19 Nov 2003 16:11:03 EST

Reply

ROB,

NO, YOU DON'T NEED A RPM SWITCH TO BE SAFE (AS FAR AS ACTIVATING) SOME PEOPLE USE A WINDOW SWITCH IN ORDER TO SHUT THEM OFF, AS WELL TO PREVENT THEM FROM RUNNING AS THE CAR HITS THE REV LIMITER. ZEX IS STILL THE BEST WAY OF ACTIVATING A SYSTEM, IT IS STILL THE MOST CURRENT TECHNOLOGY.

AS FAR AS RUNNING THE ENGINE BELOW 3000 RPM WITH NITROUS, THATS OK AS LONG AS YOU ARE AT W.O.T., YOU WOULD NOT WANT TO REV THE ENGINE UP WITH NITROUS AS THE SOLE METHOD OF BRINGING FUEL TO THE FIRE, IT STILL NEEDS THE REST OF THE FUEL IT WOULD BE RECIEVING AT THAT GIVEN RPM, THATS WHY THEY SAY YOU SHOULD BE AT W.O.T. (FOR THE FUEL ENRICHMENT) WITHOUT IT THE ENGINE WILL BE VERY LEAN

REGARDS,
PETE

 

First, I think you are right in the fact that in the amounts we are talking about here (75-100 HP shot), it is probably not needed, as long as the user is not stupid about it.

I think if people really want to be safe about it though, they should get a window switch. I think the TP voltage activation really does nothing as far as safety. You can basically take that TPS switch out and put a mechanical microswitch with a long lever that you can adjust in there. It will do exactly the same thing.

When I used the Jacobs Nitrous Mastermind on my Mustang, I was shooting a 250HP shot through a GT40 plate system. I wanted to be real safe about it, especially having a manual trans. You never know when you might miss a shift or when the T5 was going to grenade. The last thing I wanted was to wreck a motor.

Back to the zex thing, I think it looks like a good system, and I like the way they use the TPS voltage to activate it. But I don't think it is any safer than any other system. Activating a nitrous system below 3000 rpms...hmmm. I'm not pretending to be an expert on shooting nitrous in a Lightning, because I am not. You've done it a bunch of times with no problems, and you've tried a boat load of combinations and it works for you. I am sure that your tune has a lot to do with it.