4" Crossover tube?

[RSWORDS]

Begle I have a 2-1/2 on mine and I think I have plenty of room for a 4" don't think its needed but I think it would work...

[RSWORDS]

Begle I have a 2-1/2 on mine and I think I have plenty of room for a 4" don't think its needed but I think it would work...

[Ace]

If you have a 5 gallon tank with 50 psi in it theres less air in there then a 50 gallon tank with 50 psi in it.

And if you plug the same air blower on the chucks and push the buttons, the same amount of air flows through both of them until the little one runs out.

Pop Quiz: When does the 2 or 3inch tube feeding the Cummins run out?

Somebody somewhere has the numbers that say X CFM is required to make Y horsepower on a 5.9l Cummins. More air is always better, but the engine is only using so much at any given time. The question is how big a tube is needed to flow X for desired Y (based on variable "F" for fuel.)

[mprmn08]

cfm needed= 2.119 x L/S (liters per second) of air - good luck with that though.

[Begle1]

I'm sure that the 3" pipe is more than enough for quite a bit of power; if anything, the 4" pipe is just going to give a bit of lag time. It might help stop some pulsation.

I think that the intake could be improved by giving the air a more direct flow to the cylinders. Currently, air going to #1 and #6 has to flow well out of its way to get to the valves, and it has to flow along the same path as air going to the other cylinders.

I've seen HD engines with fan-shaped intakes.

It isn't going to hurt anything, at any rate. Not gonna help as much as porting; that would be a pretty zealous statement.

[CaptainChrysler]

I am building a 3" one right now. Will have pics when the compressor cover gets here.

Better late than never. Here is how it turned out.
3" 90* (3-1/2 radius) elbow
3" 30* (3-1/2 radius elbow
The elbows were $17 a piece and the boot was $15.
Made the plate for free.

[RSWORDS]

What you going to do with the bracket for the throttle linkage?

I made some spacers to sit on top my plate to put the braket back up at the stock location.

[CaptainChrysler]

I am going to do something different. I did not like how big it was for what it does. It's a 5 spd. w/o cruise.

[VEfreak]

a 4 inch crossover tube might but good for a non ic sled puller. Give that turbo something to fill.

[PapeCAT]

I found that the 3" I put on there worked better for more power just because it provided more volume to allow the turbo to spool up some more before loading up, and eliminating boost flutter (although the MWE helped as well)

[KTA]

I found that the 3" I put on there worked better for more power just because it provided more volume to allow the turbo to spool up some more before loading up, and eliminating boost flutter (although the MWE helped as well)

I think you will find a intercooler or aftercooler works even better for doing just that. By the way are you planning on running water injection on this setup as well?? I know twins on boost typically run 600+ deg intake temps. That is pretty hard on pistons over time even though your egt's might be less than 1200 because of all the air from the twins.

[Richie O]

My stock 89 I had would scream the turbo when I let off in a hurry. My other 89 with the same set up plus a intercooler was not as angry with a full load to idle jump.