Just a thought right now but what do you guys think?
Instead of putting on big charger in front of a little charger, how about two little chargers in front of one little charger?
The H1Cs are pretty cheap and easy to come by and most 4BTs already have one to begin with. I'm thinking instead of running twins, you could just put two H1Cs in front of the original H1C. I realize there would be a lot more fab work with the plumbing but it would make a cool set-up. Maybe that wouldn't be best combinatiion but would it work?
My family has a superstock pulling tractor with a 4 charger, 3 stage set-up on it so I have some experience with this idea but know nothing about making something like this streatable.
Triples have been tried on the 5.9l in the pickups they works very well. The H1C as it comes on the 4bt is not an ideal charger to use, there are a lot better options available like the Hy35 with the 9cm turbine housing or the He341.
I'm sure there are better but I was thinking of a very low budget set-up so I was wondering if it would even work. I know the HY35s aren't too hard to come by either. So are you suggesting three HY35s or HE341s or some combination using them?
There was a recent Diesel Power magazine article about tripels..but,it was a 6,not 4.But,until you get some real answers,or hard fact,then if you are "bucks down'",it takes quite a few $$$$ to rebuild/replace a blown up engine.
If it works on that scale, I don't see why it wouldn't work with smaller examples.
Yeah I know it works for the pullers. (in fact, I know the guy in the picture). Our tractor has three identical chargers (two into one) and then into a different one. I am just wondering how well it works on the street. I have never driven a truck with even two or more turbos so I was a little curios. I suppose a three charger truck would drive the same as a two charger truck.
I suppose a three charger truck would drive the same as a two charger truck.
Probably so. Like parallel twin turbos, you'd just be using two smaller turbos to do the job of a single large.
I bet they used two HX80's just because they couldn't find a single big enough for their application but small enough to fit under the hood.
There is a picture floating around somewhere of a T100 or HX100 hanging from a hoist next to a 6BT as a size comaprison.
so how does a compound setup drive va a single. i have driven a gas single turbo for a while. but never a turbo diesel, also driven the gutless vw 1.6LNA diesel
a compound setup will spool quicker and be more reliable than a big single, when running at the same psi of boost. the boost load is devided between the 2 turbos insted of being all on one.
This pic shows typical results for the air flow vs boost pressure for 2 single turbos on their respective compressor maps. Small turbo on left, large turbo on right.
The upper curve shows the airflow and pressure when the output of the same 2 turbos are combined in a 2 stage (or compound) arrangement.
The compound curve clearly show the greater airflow and boost pressure in a broader fat curve, far exceeding either of the single turbos. This fat curve could not be achieved with a single turbo and it makes the vehicle easier to drive.
Remember that with compound turbos, the small turbo is usually what would be a good size used as a single turbo on the particular engine.
Edit: pic from BorgWarner document on turbos.
Last edited by bush65; 12-29-2009 at 12:54 PM.
John
Land Rover with 1989 Isuzu 4BD1T and MXA-6R gearbox
The intended purpose is just to have a good running daily driver and experiment with things like this. My thought was that even though it is more complex, it would possibly be less cost to use smaller and cheaper turbos instead of big expensive ones.
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Three Charger, Two Stage ??
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Originally Posted by OM617
