General waste of my time

bracker8040 said:
You will always make more PEAK power when you run a turbo as a single, but compound arrangement will have a much wider USABLE power band. If you can spool the GT55, and keep it lit, run it as a single to pull it. I don’t have any experience to know how that will go. If you were gonna work the truck, you absolutely would want to run it as a compound arrangement. Even sled pulling it you might want to just for the fact thet you won’t have to worry about getting and keeping the single 55 lit.
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This guy gets it. Single for peak power, compounds for more usable power. Most of us don’t like a working truck to preform like a YZ125. For dyno or pulling a single wins except when you can’t keep it lit at the end.
 
SmokinCAT said:
Nope, though I have worked with the guy that makes it to make them better, I dont think that design will be sold though.
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I would say you are correct. The way this one showed up I would say there is plenty of room for improvement. It works for now to get me going for the weekend but I will definitely be reworking it this winter.
 
Any guesses on how much psi is too much? Right now I have rpm's cut short of what I want but I fear I am already pushing this turbo pretty hard?
 
Yes there was a lot of work to be done.
 

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i-r-truckdriver said:
Any guesses on how much psi is too much? Right now I have rpm's cut short of what I want but I fear I am already pushing this turbo pretty hard?
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I would not push it much farther than that, the cat GT series chargers have a stubshaft that doesnt pass all the way through the compressor wheel so they may not be as stable at high pressure.
 
i-r-truckdriver said:
So you're using the older style pulse manifold? Isn't that the one you told me Wouldn't work well?
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I am using the industrial style manifold, it is different than what we talked about, I could not use a pulse because I do not have the clearance for the turbo to be mounted like yours.
 
SmokinCAT said:
I am using the industrial style manifold, it is different than what we talked about, I could not use a pulse because I do not have the clearance for the turbo to be mounted like yours.
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Ahh. Just looking at the ports they seem to be much bigger than what I currently have.
 
I got an acert set off of an sdp. The turbos seem to different than the other set I have. Obviously the center section is ball bearing but wheels and housings seem to be different.

The gt55 off the SDP has a 10 blade compressor. Would this be a better turbo to use over the gt55 I currently have on?
 
SmokinCAT said:
They are because of the amount of time I spend on that manifold and adapter.
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Just by looking at the pictures I don't think the manifold I am using even has enough material to grind to that size.

Would it be better for me to use the 10 blade sdp turbo? Is it also a stub shaft?
 
i-r-truckdriver said:
Just by looking at the pictures I don't think the manifold I am using even has enough material to grind to that size.

Would it be better for me to use the 10 blade sdp turbo? Is it also a stub shaft?
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You would be surprised, there is enough meat in the flange for the full port size of the T6.

Yes, it is likely that the SDP turbos are also stub shaft.
 
The 1.12 housing I bought turned out to be pretty corroded and the seller didn't think it would seal well to the center section. I am currently working with him to just send me an internally gated 1.18. With the gate I should be able to turn more rpm? Or with this housing being divided will it still be over speeding?
 
i-r-truckdriver said:
The 1.12 housing I bought turned out to be pretty corroded and the seller didn't think it would seal well to the center section. I am currently working with him to just send me an internally gated 1.18. With the gate I should be able to turn more rpm? Or with this housing being divided will it still be over speeding?
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The 1.18 being a divided housing would make it more responsive, and drive it harder if the exhaust manifold and adapter kept it divided all the way into the turbine housing (pulse style). If the adapter is open, or if the manifold is open throat before it gets to the turbine housing it will act like an open housing.
How big is the wastegate port on the 1.18? How much bigger is the flap than the port? You can enlarge the port until the flap barely covers it, and them run an adjustable pressure regulator to regulate boost going to the wastegate head. That will allow you to the change how quickly the gate opens, and also allows you to regulate total boost up until the wastegate port can’t flow enough to limit total boost.
Trial and error. You are savy enough to do it!!
 
This is what the manifold flange looked like when I got it to where I was happy with it, there is enough that the T6 port would have enough room.
 

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