building up a nitrous motor

[skorpion317]

i was originally thinking about a turbo system for my car, but i may decide to go with a nitrous system after seeing the price differences. my question is, i would want to make the engine bulletproof to just about any shot of nitrous i would throw at it. what would i need to modify to allow the engine to withstand 100-150 shot of nitrous?

[snatch]

pistons and rods are the 2 main components that come to mind. I have a set of Wiseco forged ceramic/moly coated pistons Im selling for $500.
Intense racing sells the same type for $900.
Email me if your interested.
Shane

[97rs4life]

yea pistons and rods, along with a upgraded fuel system (i.e. walbro 255 fuel pump) are the main things. Maybe some ignition stuff would be smart to.

[12secondv6]

Well, 100 shot can be done on a stock bottem end.

Most likely a 125 shot can be done also.

To be safe:
Cryo prepped crankshaft
Pistons, slightly lower compression than stock
Connecting rods.
Valvetrain
255 LPH fuel pump
Piston rings
Port intake and heads

Direct port.

I have tried 125 wet multiple times and resulted in backfires.

I think the weak link of my system is the angle of the upper intake manifold.

It would be safe/ smart to do a direct port with anything over 125 shot.

[skorpion317]

i'm planning on starting with a dry system, NOS's kit for the 3.8l most likely. that's one of the only kits i've seen specifically for the 3.8l.

what other tuning would i have to do? i'm talking like fuel maps, etc. would i have to get something like the HP Tuners program?

[12secondv6]

I don't know about HP Tuners yet.

I will be using them shortly.

I'll post results.

Timing would be left stock though

Wideband dyno tune to make sure everything is fine

[malice10985]

I blew up my stock engine on a 125 shot, but that was because I had a full manual setup and I wasn't paying attention to what I was doing.

I built a bulletproof bottom end and everything is great. I can bounce off the rev limiter, spray at low rpm....and the engine lives on happily. (I don't do these foolish things regularly, nor do I recomend doing them ever).

Check my sig link for a synopsis.

[12secondv6]

When you say low rpm... how low?

Because the engine needs some velocity for nitrous, too low a rpm can cause problems

Bounce off the rev limiter..... cuts fuel... that is bad

[malice10985]

THe kit instructions say never to spray below 3000rpm. I have sprayed at 2600 a couple of times.

And yes, I know that bouncing off of the rev limiter sucks. It sucked 1700 bucks right out of my wallet for a new engine.

[12secondv6]

I lost an engine on a 120 shot..... due to me installing wrong injectors... and not tuning it to compensate :(