I have heard that a blown motor can also use nitrous in small amounts. If I were to design a motor with a bower and nitrous, what would I need to know? I haven't learned about how the nitrous systems work yet but wanted to use this as a starting point.

What would be the boost limits? What about compression ratio? Cooling?

Thanks

 

Are you new to the whole thing?

What experience do you have?

Supercharging and nitrous will require a race level motor with forged pistons, massive rods, etc. Expect to blow up one or two in the process.

If you are talking a basically stock motor, then you are talking very small amounts of boost and nitrous. Expect to blow it up.

 

When you posted nitro in the topic I was not thinking nitrous... Nitro is something way different... Anyway

85e, stop being so negative. With proper tuning I've run 10psi with a 100hp shot of nitrous on a bone stock mustang 5liter.
You are correct with one thing, be ready to blow up a motor or two. I wasted two in my mustang, but I was 20 at the time and only had nitrous experience. First one blew head gasket with too much timing, not because engine parts were weak. Second one burned a hole in piston. From being too lean, injectors being too small.

Learn on the fly with a motor or two in the trash pile, you tend to remember your mistakes and pass along experience instead of being negative.

Ask questions, and we will help where we can.

Why do you want to boost and nitrous??
What's your budget
Boost limit depends on pocket depth. If you have deep pockets then you can build a severe duty motor and give it plenty of boost, but be strong enough for a sniff of nitrous.

Cooling of engine will need to be up to par, and you'll need a decent size ic if you want to put more than 10psi.

Two types of nitrous, dry and wet system. You don't want dry unless you have a great standalone efi. A wet system can be a few things. Plate or fogger. Plate can either be between tb and intake or between upper and lower intake. Fogger can be 1 nozzle before or after (preferred) tb or 1nozzle at each intake port.
Depending on how much nitrous you wanna spray, and space limitation, and depth or pockets (again) you can do many different things.

Need many supporting mods for each power boost.

 

Makes perfect sense you not understanding what I meant from the title, me not having used either nitro or nitrous, I wasn't thinking they could be mistaken.

Let's say I wanted to start with the motor I have in my signature and add a small, maybe 50 or 75 shot of HP via nitrous. I don't want to go extreme, just a little something. For extreme I'd go with a stroker.

For a small shot like this, what are the things I'd need to know? How to inject it? How strong to make the head gaskets? Would this require an IC for this small shot? How to determine that?

Do you have any good readings on this? I have heard that you can't or shouldn't inject it before a certain RPM, if that's the case, how do I determine this RPM?

Thanks.

 

I thank you for your first hand experience post. I am amused that you chide me for being negative, and then recount your two engine failures.

OP can make a more informed decision now.

 

What are you, a politician. Only quoting what you like to try and make your point. Get the stick out your a$$ and reread what I posted, and you'll figure out what my point was. Stop being negative, and yes, be ready for a blown motor. The end.

You don't need a race motor like you were claiming. With proper tuning I made 500hp at the wheels with a bone stock motor...after proper tuning. I was 20 at the time, my experience was low, I didn't have a Dyno, and I made a mistake... Oh well. I learned a lot with those two 200$ motors I threw in the car. I wouldn't change anything. That's experience and knowledge you don't forget.

Why don't you pass along some experience instead of telling people they can't do something, or be quiet. Don't misinform people and don't be negative(or should I have said "be more supportive")

 

For 50hp, you could likely get that much with a good charge cooler. Cooler charge temps will allow you to run more timing, which will make more power at the same boost level.

 

Exactly. I originally only sprayed 50hp (wet into the intake) nitrous for the cooling. When I got my standalone put in the car I added a dry shot in the inlet side of the IC and it was awesome. 50hp dry into the IC felt way better than 50hp wet in the intake.
Anyway, I ran a small srt4 IC and while it flowed well (big tubes) when I logged temps pre turbo, post turbo, and post IC, i wasnt impressed. it had a hard time on the long hard pulls. (Now its mounted on the front of my turbo 1liter geo)

I really suggest using a psd aluminum IC from the 99-03 superduty so you can weld mounting tabs anywhere. Or an 03-08? 6liter plastic tank IC (look up how others mount it) and never worry about charge temps.
The superduty is fairly easy to put in an OBS truck, and it fits around the AC condenser and radiator.

You could do an air/water cooler but I think it will add more cost than you want.
My TT psd may get an air/water possibly, gotta find some temp logs.

 

No need for welding mounting tabs on the PSD cooler, just remove the middle radiator support and modify the hood release. The PSD coolers with the plastic bowls work well also if that is all you can find, cheap.

The less evasive route would be to use a water/methanol injection kit and plumb it in near the throttle body inlet.

 

For my background, I feel I have come a million miles from where I planned. I started with a SD to MASS Air conversion which resulted in the motor not being able to hold any good RPM. I decided to go to the next phase where I learned to design a motor and buy the parts needed to assemble. I then got a wideband O2 and a Tweecer RT and am logging and adjusting my tune (this is what I never thought I'd do). It's really opened my eyes to how this older technology works, I think it's great. I've been in IT for 20 years and I like this technology because it's old enough to be modified by us yet new enough to be practical.

Right now I am working on the MAF curve and I am getting VERY close to being happy with that. Most of the other parameters are set and then I'll start to learn how to adjust the timing for load and boost. It sounds like this process might help me do what UNTAMND has gone through. I've had this truck for 17 years and I don't mind blowing a motor but I don't want to completely wreck this one, it's becoming my daily driver again and I love it.

With the knowledge about tuning I have learned, I think that will get me much more ahead of the game for my next motor than when I started with the one I am on now. There are a few good speed shops and performance tuning places I can rely on as well.

 

There is a slight chance I can find this at a local pick-a-part, thanks for the info. I just might do this to my truck anyway (hadn't planned on this until you mentioned it). It's another trick I will have up my sleve for my friend who has a 93 F150 Flareside with a kenne bell supercharger, he's competing with me. He doesn't know the remaining plans I have for this truck so this is another in the bag.

 

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I'm sure you meant to say something but it sounds like you are talking with peanut butter in your mouth, I couldn't understand a word.