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Old 08-31-2010, 11:54 AM   #1
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Nitrous-what to expect

As compared to a turbo, a nitrous kit seems to be a more cost effective way to squeeze out an extra 25-100hp. What am I getting into if I proceed with a kit?

Without engine modificaitons, I hear that I would be limited to a 50hp boost without risking damage. That sound right?

Outside of a throttle position sensor and a change to the fuel pump is there anything else that needs to be changed by installing a kit to a stock focus?

I got a 4-speed auto(wife better learn to drive a stick)-is it worth it to add it to an auto or find a used stick shift and use that as the build car?

Any help would be great. Thanks


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Old 08-31-2010, 11:59 AM   #2
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Expect a rod through the block without a tune.
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Old 08-31-2010, 01:59 PM   #3
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you can run a 50 shot on a wet kit without a tune. any more and you should get tuned. probably a good idea on an auto to firm up the shifts. If you run a window switch you can stay WOT while it shifts and the switch will cut the nitrous at a certain RPM, making it much easier on the auto tranny

theres no need to upgrade the pump or fueling system for a small shot, CFM sells an adaptor for the fuel rail which isnt necessary but looks nice and you wont have to tap into the fuel line.

the ZEX wet kit activates off of your TPS (not sure on other brands), its very safe and easy to install and use
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Old 08-31-2010, 04:04 PM   #4
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Thanks for the help. This is something long term, but should definitely make things easier.

The ZEX wet kit you have, was that not too bad to install with directions, parts, etc.?

What's the dif between the wet and dry? ( I know the direct and it is way to expensive to bother.)
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Old 08-31-2010, 04:13 PM   #5
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A wet nitrous kit taps into the fuel rail (or dedicated standalone fuel tank usually filled with high octane race gas) and has not just a nitrous solenoid, but also a fuel solenoid that sprays nitrous and fuel into the intake. You pick and choose your fuel/nitrous jets to tune the air/fuel ratio.

A dry nitrous kit generally will spray nitrous through the car's MAF (mass airflow sensor) which will register as additional (colder and more dense) air and therefore direct the stock fueling system to flow more fuel. A dry setup that relies on the MAF is not the most precise method to add fuel.

Either way you go, it is necessary to make sure you aren't running lean or too much timing. With a dry setup, you need to make sure the injectors can flow enough fuel (duty cycle generally should not exceed 80% or else they could go "static" and lock on or off) If you go with nitrous, definitely look into running a wideband sensor/gauge and check your plugs (you'll also want to use "colder" plugs than your normal heat range).
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Old 08-31-2010, 05:16 PM   #6
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1 step colder spark plugs, premium fuel, wet kit. I used the MSD window switch in my old focus and it was all pretty easy to install and after doing all the research found it was safe on a stock engine, i would say get a 5 speed but ive heard of the auto guys using spray too. and i would never use a dry kit...too risky, but a wet kit is just as safe as turbo as long as you dont get too greedy
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Old 09-01-2010, 04:29 AM   #7
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yeah, working on my 50 shot kit. I'm running a NOS wet kit, rpm window switch, bottle heater, fuel pressure switch, and I'm using a fuel rail adapter. The kit I have is for a stock motor just don't go above a 75 shot. Either way I HIGHLY recommend a tune.
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Old 09-01-2010, 08:07 AM   #8
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In the long run it's not worth it, Save for the turbo, Refilling that bottle aint cheap.
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Old 09-01-2010, 12:26 PM   #9
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Quote:
Originally Posted by drosado15 View Post
In the long run it's not worth it, Save for the turbo, Refilling that bottle aint cheap.
I respectfully disagree.
Its power when you need it,its not like you will be spraying going to work.
If you use it when you NEED the power,I think it will take a long time to have the same amount of cash on N2O refills be higher than the cost of a decent Turbo set up.
I just question how quick will a bolt on atx Focus be with nitrous?
I have the Zex wet kit,cannot wait for the install.
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Old 09-01-2010, 09:29 PM   #10
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I have a zex kit and run a 65 shot but only use it in the track. and I also have an auto now when it comes to a tune you should get one especially since you an auto. So you can stiffen up the pressure. a zex wet kit is the best I hooked my up myself and its very easy. A msd window switch is best. Anymore questions you can ask me. But the main point is get a tune no matter what


Duece if you need and advice or help with your zex kit just let me know.
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