custm2500

iTrader: (11)

I have a 408 with 12.5:1 compression. The motor with 13.2:1 made 52x hp.

I would like to use my stock injectors if possible("01 6.0 truck). If these won't flow enough then obviously my question is how many lb injectors do I need. I am using a TBSS intake and the stock TB with adapter for now, unless I find a larger TB that i can afford before installing the motor. I will upgrade at some point so I might as well plan for it with the injectors.

Little bit more info, I won't drive this truck much and 99% of the time it will be driven at the track on a wet nitrous kit. I am planning on spinning this motor to 7000 to start with if that matters.

Thanks trying to get everything to drop it in.

custm2500

iTrader: (11)

The builder said 43-46 lbs injectors. Does this seem correct.

FICINJECTORS

iTrader: (30)

with those numbers you need a 50lb @58psi. we like to use the bosch ev14 they will be a direct bolt in no mods.we also sell a plug and play wire adapter or pigtails.we sell the complete kit for $399.00.

jim ravencraft

Hi,
should have you in the ball park......what size fuel pump??????????
Check wallace racing for info that may help you decide..have a blessed day...........jim

custm2500

iTrader: (11)

I have a walbro 255. I am planning on that being enough pump for the motor and a 100-150 shot.
When I plan to go above 150 of nitrous I will get a stand alone.

What duty cycle will the 50s probably run at?

You bring up pig tails does that mean the stock wiring won't work with the bigger injectors.

FICINJECTORS

iTrader: (30)

you should be around 80%.all injectors in the pounds you need will have a different plug.its no big deal we have wire adapters that will plug from injector into stock harness.they are included in the kit.

Souless

iTrader: (2)

I have a 408 LS2 running the 33lb@58 injectors with the adapters that FICInjectors mentioned and a walboro 255 pump. I agree with him on a 50lb injector. Running the 1/4 you will probably see close to a 90% inj duty cycle, spaying on top of that would make them almost statically open. I sprayed 100 a few weeks back and hit 95% inj duty cycle, anything above 80% and I would look at upgrading.

custm2500

iTrader: (11)

For referance, how many lb are my stock 01 6.0 injectors.

Also does everyone agree the 255 will easily support motor and atleast a 150 shot. I think it might support a little more but I am figuring on going to a higher fuel for the nitrous over 150 due to such high compression. Let me know how much nitrous the 255 should support on the motor making 475-500 N/A. Thanks.

ZL1Killa

iTrader: (17)

https://ls1tech.com/forums/fueling-i...ump-chart.html

Also, www.rceng.com and go to TECHNICAL / Sizing. Please understand the fuel system items.

fuel injectors are usually rated at 3 Bar or 43.5psi, there are a few (possibly increasing) manufacturers that are using 4 Bar or 58psi

If you have a fuel system at 58psi, and you use an injector that is rated at 43.5psi, you will actually have a larger fuel injector in your application.


*Lets say your ACTUAL FUEL PRESSURE is 58psi, period.
For instance, this 50 LB/Hr injector @ 58psi is just that, a 50LB/hr injector

HOWEVER
if you have a 50LB/Hr injector @ 43.5psi and you are running it at 58psi, you actually have a 57# injector; therefore giving you more breathing room.

I would recommend a 47# or slightly higher injector at 43.5psi RATING. Is this vehicles ACTUAL fuel pressure 58psi?
If avoidable, I would not run injectors above 80% Duty Cycle

custm2500

iTrader: (11)

Yes my pressure was 58.

I fully understand that injectors are rated at a certain psi.