Compound turbo setups?? Anyone done one??

Not really any more boost than a single turbo.

 

First, an acert does make more boost than a single turbo. My 550 cats make 35 lbs of boost under full load, our 475 acert makes over 40 and still won't out pull the older e model. We have done one compound turbo setup in a 99 Pete with a 3406e. I forget what the turbos were exactly but the truck makes right at 48lbs of boost. We put a JWAC cooler on it and tuned it to a 600 cat tune and put the 800 horse marine cam in it. Mind you this is not our fortee but it's the owner of one of my big customer and he wanted to try it so we did. That truck is a monster, he pulls end dump here in Texas and it's crazy that truck never slows down. Only problem he has is that in the summer he has to back off of it or it will try to overheat. Other than that it's been good. Pyro stays in check, intake air will get a little high in the summer though. I personally wouldn't do it because of longevity but it's his money. He did crack the head once getting it a little to hot but we replaced and been good about a year now. Pretty sure PDI makes and sells a kit for this application. I also hear that people are fabbing up mounts and using the stock acert turbos on older e models and c15 with great success

 

Those turbos will support 800hp, they can be bolted to almost any 3406 based engine.

 

Some N14's are mechanical. At EZ we had a 1993 Ford L9000 with N14 at 315hp. Even in 93 they were running wires to the mechanical pumps and playing with cruise control ideas.... You know for the government. That particular truck had a lack of power as noted one of the drivers. The "parts replacer" and I shouldn't give him that much credit, messed with the pump for days. Never took it off but tinkered with it. Stopped in a Friday as usual, as I stood there watching I almost choked, listening to his pearls of wisdom on what was wrong with truck. I myself started looking and you know what the problem was? The air to air adapter bolted to the manifold had built up corrosion so bad, it actually broke the mounting ears off. I could stick my knife blade through were the gasket used to be. Gotta have air to make it pull, hard to get it inside the motor when it's escaping on the outside.

 

The acert has to make more boost because when the IVAs are active the intake valve is held open.

There are guys that have done back to back testing of just turning the IVAs off and boost has dropped a good bit and no change in power on the dyno.

You changed to that setup on your pickup because you were to the point that a single becomes less practical on the streets, I can almost bet you are no where close to that on your big truck engine.

 

Because there are singles that cover the normal working HP range without trouble.

 

I think @wore out has a compound turbo set up on a 3406B in his 359.

 

If one turbo grenades you've got to replace both which is another disadvantage.