NOS in a 5SFE

[Mister22u]

Okay, so I like my car and I like drag racing. I've never tried to drag race my 5SFE, but I can imagine the 15-second disgrace that I would churn out in the 1/4 mile.

So, what I had in mind was a 100-shot, for use only at the strip (of course, heheh).

Is this possible? Is there a lot of other issues I would need to do, like changing the timing or fuel pump (or adding a fuel pump)? Let me know what you think.

I'm thinking of a dry system: Amazon.com: NOS 05122NOS Sport Compact Dry Nitrous System Kit: Automotive

or a wet system:
ZEX 82021 "Only $489.88" WET Nitous Kit Honda, Acura, Lexus IS 300, Mitsubishi Eclipse, Sport Compact - Nitrous Kits - Atlantic Speed Warehouse


Thanks for the help!


BTW - the other idea I had was just buying a JDM turbo engine/trans/ECU and doing a swap for less than $2000, but I kind of want something even more esoteric.

[Ben]

Originally Posted by Mister22u

BTW - the other idea I had was just buying a JDM turbo engine/trans/ECU and doing a swap for less than $2000

I would just go this route There is more to build upon going this way.

[scooterman]

a dry shot will pop that engine faster than a * insert dirty phrase here *

should handle a 50 wet shot fine, 100 well good luck with that.

you'll need to retard the timing, you shouldn't need a new fuel pump but it wont hurt.

[scooterman]

also something else to add i was reading about that zex system

"Instead of relying on crude micro-switches or push buttons, the ZEX "wet" nitrous system uses advanced electronics to "learn' the throttle position sensors voltage curve."

if you have a 91 or 92 you dont have a voltage curve its either 0V or 5V

[mrturrari]

A dry shot is no more dangerous then a wet shot if it is installed correctly. As a matter of fact some would argue it is safer because there is less to go wrong.

100 shot is a lot though. That is almost doubling the hp of the engine and you will definitely need a new fuel pump to use it. You will also need fuel management and tuning to make it safe at that level. Just think of it as running 12psi of boost without the restriction of the turbine in the exhaust. Cylinder pressures almost double, heat output also almost doubles so you need to adjust your timing on the fly to compensate.

[scooterman]

but a dry shot does not introduce more fuel through the nitrous system. The engine would run lean without a fuel modification. Doing a fuel mod on a 5s to only work when firing a shot of nitrous would be pretty difficult would it not?

a wet system would spray more fuel through the intake a long with the nitrous correct?

[shimric]

NOS.....

bwahahahahahahahaahahahahaha

It's nitrous buddy.

"Engaging nawzz"

[Mister22u]

This is all very interesting. I'm now thinking of a 50hp wet shot.

The turbo is still an idea, but I'd rather have a choice of when to buy 93 octane. Also, I hear with a turbo you can't just drive to the grocery store and back without waiting for the car to cool down before restart? I dunno, I've never owned a turbo. :-/

[Ben]

^ Turbo timers allow the car to run and shut off automatically so you don't have to sit and wait.

[Gairloch]

What do you do is add a little pepsi to the oil in order to prevent coking ...

[mrturrari]

Originally Posted by scooterman

but a dry shot does not introduce more fuel through the nitrous system. The engine would run lean without a fuel modification. Doing a fuel mod on a 5s to only work when firing a shot of nitrous would be pretty difficult would it not?

a wet system would spray more fuel through the intake a long with the nitrous correct?

There is no way any Nitrous system would work without adding fuel somewhere. The engine would just go boom when you started spraying. Wet shots add fuel through their own injector before the throttle body. Dry shots add fuel by increasing the pressure at the fuel rail so it is added by using your current injectors. Because of that dry shots are safer because there is less to go wrong and you get more even fueling between cylinders. There are some other good threads here in the Nitrous forum that give more details.

[mrturrari]

Originally Posted by Gairloch

What do you do is add a little pepsi to the oil in order to prevent coking ...

I'm going to have to try that.

Originally Posted by Mister22u

This is all very interesting. I'm now thinking of a 50hp wet shot.

The turbo is still an idea, but I'd rather have a choice of when to buy 93 octane. Also, I hear with a turbo you can't just drive to the grocery store and back without waiting for the car to cool down before restart? I dunno, I've never owned a turbo. :-/

You only need to let it cool down if you have had it under heavy load for a decent period of time. That will only be when you have been driving aggressively more then a pull or two or you have been driving on the freeway. Also you can immediately start it nothing wrong with that. You just don't want to turn it off with a blazing hot turbo and let the oil cook in there. Just driving normally a few blocks will cool it down so most of the time depending on where you live and where you drive you don't even have to worry about it.

The great thing about turbos is they are always there and ready to go. No bottles to fill and keep warm.

[phantomMR2]

Yeah, he is right. You only have to let the turbo cool down if you are racing or aggressively boosting. It's almost like a normal car, as you would. Go Turbo man its fun and worth it. I paid about $2000 for my swap to the genII 3sgte swap. Cant go wrong with the jdm swap.

[Mister22u]

Originally Posted by phantomMR2

Yeah, he is right. You only have to let the turbo cool down if you are racing or aggressively boosting. It's almost like a normal car, as you would. Go Turbo man its fun and worth it. I paid about $2000 for my swap to the genII 3sgte swap. Cant go wrong with the jdm swap.

Hmm, that's the route I was thinking.

but like I said, the 5sfe is still fun for me; if it gets boring in a year or so, I'll buy me a JDM.

[MR2SW22]

Originally Posted by Mister22u

Hmm, that's the route I was thinking.

but like I said, the 5sfe is still fun for me; if it gets boring in a year or so, I'll buy me a JDM.

$20 says your 16 years old or at least still a teenager? im just curious.

the 2nd gen jdm swap is awsome, i'll take boost over nos anyday, just run stock boost driving around town, and when you want real power crank up the boost and you can add anywhere from 10hp-500hp off of boost. mostlikely you'll only get 70-100hp but at least you won't have to call a tow truck to get your mr2 home after a run at the drag strip.

[Mister22u]

Originally Posted by MR2SW22

$20 says your 16 years old or at least still a teenager? im just curious.

Why would you say that? Should I be offended? Hell, nothing $20 couldn't remedy.

Donate it to the Forum.

[Mister22u]

I apologize; I should be happy that someone is taking an interest in me and my car.

I'm 30 years old. I am an attorney. I picked the MR2 over my other choices of cars b/c I didn't want to spend $10K on a project (I want to spend $10K on finishing a project).

I used to drag race a lot. I had one of the fastest all-motor Saturn SC2's, probably in the country (at 15.2 seconds 1/4 mile).

Anything else you would like to know, feel free to ask. ;-)

[MR2SW22]

Originally Posted by Mister22u

Why would you say that? Should I be offended? Hell, nothing $20 couldn't remedy.

Donate it to the Forum.

Don't be offended unless you want to. i just don't think most mature adults think it's a great idea to pop their stock motors with a bunch of nos. but then again you could be a rich adult who doesn't care about money, or a rich kid who doesn't care about money. i would like to know the limits of a stock 5s, and stock 3s on nos cause im curious, but not at the expense of someone will just enough money to afford the nos setup, that would suck, but if you got the $$ go for it i say, just don't forget to a video of it

[Mister22u]

Originally Posted by MR2SW22

i would like to know the limits of a stock 5s, and stock 3s on nos cause im curious, but not at the expense of someone will just enough money to afford the nos setup, that would suck, but if you got the $$ go for it i say, just don't forget to a video of it

That was my intent for asking the question. I was curious to see what others had done with the 5SFE.

I recall the KA24DE (240SX, one of my old choices before I bought an SC2) Could take a LOT of nitrous for some reason. It was a common upgrade for that engine.

do I want to be the 5SFE guinea pig? I know my wife doesn't want me to be! LOL