At what point do I need to step up to a 58tb??

[QC97Z]

Yes sir I knew id be wearing thin on fuel with the nitrous but I got a smoking deal on the 30# injectors so figured they'd be better than running the stockers, I'm gunna pill down to 150shot when I dyno tune it and see what the duty cycle is and if its too high(which it will be)ill sell the 30# and get some 42#.I asked the OP though if he was gunna run any nitrous to tell him what you just stated.30# will be fine for his motor but will be at there limits on spray.always better to overkill it a little to be safe.

Absolutely good to be safe. I'm running 82# injectors, probably don't need to be any bigger than low 70's. It's just a really shitty idea to exceed 85% duty cycle.
BTW, I'm working on a cam-only build soon for a vintage street rod. Interested in possibly selling those 30# SVO's?

[90_300zxTT]

^^^ you sir will be the first to know when I sell.

[greenz28]

^ 30's with your setup? You should be at a pretty high duty cycle at WOT, and probably maxing them out under nitrous. You need bigger injectors.

According to the numbers, you should have 42# injectors to support WOT under a 200 shot of nitrous in order to stay around an 80% duty cycle, assuming 550 horsepower under nitrous (350 N/A + 200 shot).

Assuming your 30# SVO's flow more like 33's (I don't think I should need to explain myself there), you're only able to support 425 FWHP at 80% duty cycle. Moral of the story is...you're on thin ice.

I am assuming this is a 200 wet shot? The wet kit gets fuel straight from the fuel rail and the injectors must support only the 350 n/a hp. Just make sure the fuel pump can support the full 550 hp and the 30# svo injectors should be plenty.