Nitrous in 04 2.5rs

[sanremors]

Hey, I want to put nitrous in my car and I wanted to know what size shot would be ok. I was thinking around a 50 shot would be safe, but I've heard that it could probably take a 75 just as well. I was looking at the zex dry system with the nitrous entering the intake track through the top of an intake cone. My engine is stock right now and I have 18" rims 225/40/18 tires (I don't think this will matter much). I was also going to get a short ram and exhaust for the car before I went ahead w/ the nitrous. I also know that I'll have to run super fuel to prevent detonation.

Anyway, will my engine blow up?

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[Sleepr56]

I would recommend the Zex wet kit if you are going to spray. Kirk, not sure his sn on here, is running a 55-65 shot on his 2.5rs, and has yet to have a problem with it. I'm not sure how long your stock clutch will hold up if your manual, if you auto you will want a tranny cooler. The proper way not to essentually blow up, or nuke a head gasket would be to take it slow, get everything you need, like an rpm activation system that msd makes, fuel cut safety swtich etc etc. Im not sure what the zex box provides besides the given solenoids for a basic set up.

[JonofScio]

I wouldn't reccomend a dry kit... dry is the worst way to go, ever.

you can be had on a NOS systems universal wet kit for about the same price as a zex wet kit. there's two types of zex wet kits... one is just a dry kit that shuts off the nitrous when you run lean. *but* there is one that's pretty kickass that has all the solenoids in one purple box. it's sweet. saw a writeup.

In a wet kit, I'm thinking a 75shot is possible. but I really don't know.

[Sleepr56]

yea only downfall with a zex kit, i when a solonoid goes, you have to have the box service, its not easy like other kits where you can find the problem, and swap it out for somethin new.....

[Jejunum]

what do you guys know of / think of this kit (remove the spaces, its a link to iclub.)

http://www.i -club.com/forums/showthread.php?p=723539#post723539

[Sleepr56]

If I was going to go about it, I would piece a kit together. Buy a used wet kit, and then piece together everything else you will need. 585 is a lot of money, when you can get a used NOS wet kit on ebay from 200-300 and everything else u need for about 100 bucks to be safe.

Matt

[Jejunum]

Originally Posted by Sleepr56

If I was going to go about it, I would piece a kit together. Buy a used wet kit, and then piece together everything else you will need. 585 is a lot of money, when you can get a used NOS wet kit on ebay from 200-300 and everything else u need for about 100 bucks to be safe.

Matt

hmm good point

zex kits are close to 600 on ebay

does zex make a kit that fits the RS? it says 02+WRX

[Sleepr56]

I thought they were all universal.....just tap and spray, unless you get like a whole intake set up like they make for some honda's. Most ebay auctions use certain car names just to get them to appear under any search.

Matt

[Sparky280]

I justy installed a Venom VCN-500 Recluse system, it's a small setup for the occasional boost. It only includes a 12oz bottle and is button operated but works like a charm. It's computerized so it's one of the safer dry kits. I paid $320 with free shipping..

[sanremors]

The reason I wanted a dry kit was because the car's still under warrenty and if I needed to get it serviced, it would be easier to remove. If I'm not mistaken, you need to remove the injectors for the wet kit, right? Can you run more HP on a wet kit vs. dry kit?

Also, is a purge kit necessary?

[sanremors]

Oh yea, its a manual.

[Sleepr56]

Purge kit isnt nessecery, but clears the lines of air i believe and gets you a colder shot. You could essentually go though 1 gear quick when lining up before racing would do the same thing. Most wet kits, unless you buy a direct injector kit, has 1 shooter, mixing fuel and n20 into your intake tube. Tranny only matters on how much abuse your stock clutch will take, and if its auto, how much abuse that can handle.

Matt

[Chi_San]

Be sure to be safe and run an EGT gauge if you go with a kit.

I've been debating between Nitrous and Alcohol injection, but I know little to nothing about Alcohol injection, so it's time to research it.

[Sleepr56]

For alcohol, would that be a like a propane injection kit? A guy locally here with a Saab 900SE did that...

Matt

[piker28]

Originally Posted by sanremors

The reason I wanted a dry kit was because the car's still under warrenty and if I needed to get it serviced, it would be easier to remove. If I'm not mistaken, you need to remove the injectors for the wet kit, right? Can you run more HP on a wet kit vs. dry kit?

Also, is a purge kit necessary?

oh im gonna see this thread in the future

"stock engine blew, stock tranny went, SOA wont replace!!!! "

-sits back and waits-


i was gonna go with nitrous but it really doesnt do much except for the track, which our cars arent made for at all, i mean come on its an rs, heavy and motor doesnt make that much power. prob better off to save your money for cams or something

oh yea a CAI would be better than a short ram, i had a short ram i think the CAI made more gains in the power band

[powerlabs]

I second that. A short ram made my engine lean out so much that it hit fuel cut at 5500RPM.

[RyansJDMgc8]

I ran a 65shot Zex dry kit for quite a long time with no problems. Also I had a purge valve which was cool. The nitrous came in very handy when the guys at work said their car could smoke mine. My car is mildly modified and with the nitrous, I beat WRX's, 350Z's, s2000's, stock SRT-4's, etc... I thought it was very worth it. Local law inforcement made me remove it though.

Oh yeah, never race a BMW M3! Sucker SMOKED me and I hit the nitrous in every gear, INCLUDING 1st at launch!

[sanremors]

RyansJDMgc8-
Your setup is what I was thinking of doing. What modifications do you have done besides the nitrous?

Also, what's an EGT gauge?

[RyansJDMgc8]

for the nitrous I put in a WRX fuel pump, Weapon-R adjustable fuel pressure regulator, Lots of gauges. I have heard of an EGT gauge but am not 100% sure what it is. I think maybe Exaust Gas Temperature? But I have heard It is a good gauge for tuning. I had Oil Pressure, Fuel Pressure, and air/fuel ratio gauges. (All three came in handy!)

[Sleepr56]

Yea fuel is always a good thing with nitrous :-p WIth an EGT gauge or exhaust gas temp. gauge you can road tune if you have a piggy back like a safc or emanage. As you increase the fuel, egt will rise, and eventually hit a peak and come back down. The peak is usually where hp is made the most from what i have seen, done, and read. Also a oil press. gauge is nice, fuel maybe, and a/f if you wanna see a rough visual of whats goin on.

Matt

[Sleepr56]

Oh, yea my buddie with the sprayed 2.5 ran a 14.2 his first time at the track, with the stock clutch on its way out, intake and exhaust

Matt

[4wheelflyer]

with nos ,you want a wet kit for sure , the dry system's can run very lean.
the wet kit adds fuel with nos to stop leaning out. they say on a stock motor you can run up to 40% of you stock power in nos, any thing more and you will have to upgrade fuel delevery and engine internals

[Chi_San]

Originally Posted by Sleepr56

Yea fuel is always a good thing with nitrous :-p WIth an EGT gauge or exhaust gas temp. gauge you can road tune if you have a piggy back like a safc or emanage. As you increase the fuel, egt will rise, and eventually hit a peak and come back down. The peak is usually where hp is made the most from what i have seen, done, and read. Also a oil press. gauge is nice, fuel maybe, and a/f if you wanna see a rough visual of whats goin on.

Matt

Not quite correct. The leaner you run, the hotter the EGT will be. There is a point where your EGT should be at with the correct A/F/N ratio. If you run it as hot as you can get it, you will easily melt things.

[Sleepr56]

hmmmm, i guess ill need to look into this again, i though i had it correct from last year when we were butt tuning my buddies sc 2.5 in an emanage. Thanks for the correction though, i dont wanna tell pple the wrong stuff

Matt