how long will 42# last on radix 6.0
Aug 1, 2008 | 12:57 PM
#11
As Zippy said, I did a J-tube 90mm conversion. Here is the thread I created with pictures and info:
https://www.performancetrucks.net/fo...d.php?t=358691
https://www.performancetrucks.net/fo...d.php?t=358691
Aug 1, 2008 | 05:37 PM
#13
How long a set of 42# injectors will last you depends on several factors:
One main factor is whether you have an older truck (99-03) with the return line fuel system or newer 04+ returnless. The older return style keeps fuel pressure higher and can supply 15-20% more fuel on the same injectors.
Another factor is your shift point rpms. The higher the rpm, the less time your injectors have to squirt fuel in per combustion event.
Another is what other internal and external engine mods are done in support of the blower. The better the intake and exhaust, the more fuel you'll need. Upgraded cam, valvetrain, and ported heads will have the same effect.
Finally, how much air CFM are you passing through the system. Notice I didn't say how much boost. If you know how much air flow you have, you can accurately calculate your fuel demand.
Parting thoughts - on the truck in your signature with the 3.1" pulley, you should be fine with 42# injectors and a 5600 rpm shift. I ran the 42s with a 2.75" pulley on my fully modded and cammed 6.0L SS with 6200 rpm shifts. (Yes, they were maxxed out)
One main factor is whether you have an older truck (99-03) with the return line fuel system or newer 04+ returnless. The older return style keeps fuel pressure higher and can supply 15-20% more fuel on the same injectors.
Another factor is your shift point rpms. The higher the rpm, the less time your injectors have to squirt fuel in per combustion event.
Another is what other internal and external engine mods are done in support of the blower. The better the intake and exhaust, the more fuel you'll need. Upgraded cam, valvetrain, and ported heads will have the same effect.
Finally, how much air CFM are you passing through the system. Notice I didn't say how much boost. If you know how much air flow you have, you can accurately calculate your fuel demand.
Parting thoughts - on the truck in your signature with the 3.1" pulley, you should be fine with 42# injectors and a 5600 rpm shift. I ran the 42s with a 2.75" pulley on my fully modded and cammed 6.0L SS with 6200 rpm shifts. (Yes, they were maxxed out)
Aug 1, 2008 | 05:53 PM
#14
Thanks BigTex... my guesses were that with the return fuel system I would be close, but safe. I have no desire to spin the motor up any higher than 5600-5800 as I don't want to have to crack open the block to make any internal mods.
What would make this much easier was to have the truck running to see how much fuel I used.. but the parts are still in a pile. If I think I want more parts now is the time to get them before I get the truck running and tunned.
The 90mm jtube mod if you can do it your self looks to be very decent gains for not a whole lot of money. The long tubes on the other hand (dynatech) cost an arm and a leg, but it does complete the air flow package
I'm hoping with the addition of the 90mm and long tubes I shouldn't push them over the edge.... One way to find out though
What would make this much easier was to have the truck running to see how much fuel I used.. but the parts are still in a pile. If I think I want more parts now is the time to get them before I get the truck running and tunned.
The 90mm jtube mod if you can do it your self looks to be very decent gains for not a whole lot of money. The long tubes on the other hand (dynatech) cost an arm and a leg, but it does complete the air flow package
I'm hoping with the addition of the 90mm and long tubes I shouldn't push them over the edge.... One way to find out though
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