injector size?

[Guest]

basicly what it comes down to is when your buying injectors, why get ones that just barley meet your needs??? its better to side with the calculators and get injectors that are a tad bit big for your application. i know id much rather have more than enough fuel than the motor leaning out and melting a piston cause the injectors are too small.

Agreed, I am merely pointing out the variables that occur and that math isn't always 100% correct.

[montess408]

basicly what it comes down to is when your buying injectors, why get ones that just barley meet your needs??? its better to side with the calculators and get injectors that are a tad bit big for your application. i know id much rather have more than enough fuel than the motor leaning out and melting a piston cause the injectors are too small.

thats what i am getting at my motor is just mild its got about 10.5 commpresson with crane cam stock 3400 top end msd ignition system and a 75 shot of nos and maybe a u.d. pulley the reason why i am wondering about the injectors is when i give it the juice in the higher r.p.m.s i dont want it to lean out there is a guy that i know that was a more wicked motor than me and i is only running 19lbs so thats why i thought 17lbs would be enuf .

[Guest]

If you use a, what I call "proper" nitrous system, I.E. a wet system, the fuel will be added along with the nitrous.

Though I'd suspect that with a 75 sht, you'll be using a single nozzle system that if fuel was added, it may not distribute evenly due to the "dry manifold design" of the 3400 intake system.

[montess408]

yeah i have a wet system. so your saying that i should be good with the stock injector then ?

[Guest]

yeah i have a wet system. so your saying that i should be good with the stock injector then ?

In many cases where nitrous is used up to about 100 HP shot, no additional base fuel is needed, with a wet system, due to additional fuel being injected along with the nitrous, that's what the additional fuel is there for.

My only concern especially when it comes to the genIII 660 intake is equal distributin and why I prefer port injected nitrous systems, because of the higher tunability and improved cylinder to cylinder distribution.

Now that being said, ther have been more than a few people use a single nozzle system on a 660 and not have any issues, both dry and wet systems.

Personally I feel that anything over a 35 to 40 HP shot whoud be a wet shot, because I don't rely on the stock fuel system being able to add that much more fuel. Also if you are running only a little shot, then your engine is probably stock, and therefore used quite often as a daily driver and normal running (idle drivability, etc), needs to be maintained, hence a stock injector should be retained for that. At the point where yo get beyond the 40 HP area and you're still running a stock engine, you will need aditional fuel.
If yu are running beyond the 100 HP shot, well then you probably already have some modifications made and need plarger injectors for base fueling anyway, and will need to tune for it. Then the nitrous system should be considered as a suppliment to teh engine and as such needs to be tuned on the engine, using base ideas for basic tuning, and fine tune from there.