im building my 383 and i have a set of red top SVO30# injectors, how far can i take them hp wise?? i dont want to puke an engine due to me starving the engine!!

 

safely, 400-425rwhp NA on pump gas.

 

You also need to take your fuel pressure into consideration. I've seen LS1 car go as high as 460rwhp on their stock 28# injectors. But they were maxxed out @ 98% DC.

 

so probably not a good idea to run 400 rwhp and feed it a healthy dose of sauce (im building the motor to spray it) thanks guys!!

 

I would just upgrade them just to be safe.

BTW not to get off topic but I have a 90 Turbo Laser too. Fun little cars.

 

i find my self spending too much on it modding the hell outa it. but yeah how big should i go?? like a 42??

 

i made 505rwhp w/ a set of 30s back in 1998 w/ a 12.2:1 a/f. but they were at 100%DC and i was running VP C12, 12lbs of boost and 85lbs of FP. ive been told by Spetter that if the injector is over 80% DC its time to step it up. above rated FP you start to lose pump volume anyway. you can always get away with more, and NA it will probably be fine because of the lower BSFC.

 

First, don't size injectors using "rwHP"... they need to be sized based on flywheel HP. The injectors could car less how much power is lost in the drivetrain.

There are online injectors sizing calculators and they tend to be very conservative. They generally assume a brake specific fuel consumption (BSFC) of 0.50 #/HR/HP, and limit the injector to an 80% DC. Using that assumption, you run out of injector very fast. However, it does insure that you don't drive the injectors too high on duty cycle, where both the flow capacity, injector life, and the spray pattern can be adversely affected.

For a well-tuned NA engine, you might see BSFC's closer to 0.45 #/HR/HP. The popular inijectors don't seem to get into trouble until they exceed 90% DC, so you could use these less conservative inputs to the sizing programs.

When you say you are also running nitrous, that will not affect injector selection unless you are running a dry system.

 

i know a member interested in your 30# injectors....

 

I would say around 430rwhp and less if you have a big convertor.

Thrusday at MORE performance I got 518 and 558tq out of a blown vette with 30 SVO's but it also had an FMU