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Old 10-18-2011, 06:53 PM   #1 (permalink)
spectreblazer
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Twin Turbo banks 6.2L

i have 2 banks sidewinder kits that i have laying around and i'm kicking around twin turboing the 6.2L i have.

it is mildly built to take boost but i was wondering if you guys have ever seen anyone flip the manifolds over and using the normal passenger side banks manifold on the driver side or if it would even work (i'm away from home for school and don't have the truck) or is the shape different?
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Old 10-18-2011, 07:02 PM   #2 (permalink)
RCpullerdude
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You'll need a couple smaller turbos to make it work. The driver side charger would also end up tucked back towards the firewall. May see steering shaft interference issues.
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Old 10-18-2011, 07:16 PM   #3 (permalink)
spectreblazer
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wouldn't it still be around 10psi of boost though?

i can see steering shaft interference too..didn't think of that good point.
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Old 10-18-2011, 07:39 PM   #4 (permalink)
RCpullerdude
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No. The stock Banks charger is a large non gated charger. If you run true twin Banks chargers, you'd be lucky to ever get them to spool. It'd be more fitted to a 12.4L than a 6.2L.
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Old 10-18-2011, 08:45 PM   #5 (permalink)
Altec
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To explain about the turbo size. Your engine has a certain flow rate at a given RPM. A example is at 1800rpm you are flowing roughly 13.2lbs/min, at 2400rpm you are looking at roughly 17.8lbs/min, and at 3400rpm you are flowing 25.1lbs/min (These are very rough, uncorrected numbers for a 6.5).

Now, a turbocharger turbine section is designed to do its job within a specific flow range. Where it starts, and where it peaks. If we look up some turbo chargers, we can find the turbine, and compressor maps. In this instance, we want the turbine map. I looked up a basic Garrett model because they are one of the few companies that don't keep this information locked away. If you click the link below, you can see the turbine map.

Now, if we look at the turbine map we will see the flow on one axis, and the pressure ratio on the other. Pressure ratio is easily figured out with some simple math, but it amounts to your boost level...

So now that we know what we are looking at, we can plug our numbers in. If we take the flow number for 1800rpm (13.2), we will see we are just below the area of operation. However if we bring the RPM's up to 2400 (17.8) we start getting into the range of the smallest A/R turbine at lower boost levels. 2400RPM and 10psi (1.68) ends up just below the range. If we come up to 3000rpm (22.1), we find ourselves in about a perfect range. However, at close to redline, you end up very much above the line.

http://www.turbobygarrett.com/turbob...R_714568_3.htm

So, with the information above, we now know a GT35 is a decent turbo for mid range power, but is going to peak out in the higher RPM's. However, you aren't seeing how much boost you can make, so in that sense this isn't a problem. But, considering anything above that line is where the turbo is "choking" (How it turns exhaust gas into energy), you are looking at a higher back pressure on the engine, and higher EGT's. Now, if you are building a tow rig that is going to be riding in those upper RPM's a lot this is a problem. A DD/toy on the other hand won't see much in this range for long.

I hope these examples help you understand how feeding a turbo works. To feed twins, you are basically going to have to half the flow numbers.

This is kinda the crash course, and missing a lot of details. I suggest starting looking around google for articles. There is a bunch of good stuff out there.
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Old 10-19-2011, 09:16 AM   #6 (permalink)
spectreblazer
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Quote:
Originally Posted by Altec View Post
To explain about the turbo size. Your engine has a certain flow rate at a given RPM. A example is at 1800rpm you are flowing roughly 13.2lbs/min, at 2400rpm you are looking at roughly 17.8lbs/min, and at 3400rpm you are flowing 25.1lbs/min (These are very rough, uncorrected numbers for a 6.5).

Now, a turbocharger turbine section is designed to do its job within a specific flow range. Where it starts, and where it peaks. If we look up some turbo chargers, we can find the turbine, and compressor maps. In this instance, we want the turbine map. I looked up a basic Garrett model because they are one of the few companies that don't keep this information locked away. If you click the link below, you can see the turbine map.

Now, if we look at the turbine map we will see the flow on one axis, and the pressure ratio on the other. Pressure ratio is easily figured out with some simple math, but it amounts to your boost level...

So now that we know what we are looking at, we can plug our numbers in. If we take the flow number for 1800rpm (13.2), we will see we are just below the area of operation. However if we bring the RPM's up to 2400 (17.8) we start getting into the range of the smallest A/R turbine at lower boost levels. 2400RPM and 10psi (1.68) ends up just below the range. If we come up to 3000rpm (22.1), we find ourselves in about a perfect range. However, at close to redline, you end up very much above the line.

http://www.turbobygarrett.com/turbob...R_714568_3.htm

So, with the information above, we now know a GT35 is a decent turbo for mid range power, but is going to peak out in the higher RPM's. However, you aren't seeing how much boost you can make, so in that sense this isn't a problem. But, considering anything above that line is where the turbo is "choking" (How it turns exhaust gas into energy), you are looking at a higher back pressure on the engine, and higher EGT's. Now, if you are building a tow rig that is going to be riding in those upper RPM's a lot this is a problem. A DD/toy on the other hand won't see much in this range for long.

I hope these examples help you understand how feeding a turbo works. To feed twins, you are basically going to have to half the flow numbers.

This is kinda the crash course, and missing a lot of details. I suggest starting looking around google for articles. There is a bunch of good stuff out there.
thanks for the advice. i'll be looking into it.
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Old 10-24-2011, 06:43 AM   #7 (permalink)
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Would you consider selling one of your sidewinder kits?

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Old 10-24-2011, 01:49 PM   #8 (permalink)
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6.5 manifolds would probably work better as they are more centered. you'd have to block the crossover ports.Getting the exhaust o exit the drivers side should be a treat too as it's barely do able on the pass side on an OBS truck.
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Old 10-25-2011, 01:42 PM   #9 (permalink)
Altec
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Now here is a thought, what about under slung Turbos? Mounted somewhere around the bell housing. You could use factory 6.2NA manifolds to feed them, pipe the inlets to a nice spot, and run the outlet either right up to the intake, or have a couple small intercoolers upfront. It is a lot of pipe if you run intercoolers, but still not out of the range of sanity.
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Old 10-25-2011, 09:08 PM   #10 (permalink)
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Quote:
Originally Posted by Altec View Post
Now here is a thought, what about under slung Turbos? Mounted somewhere around the bell housing. You could use factory 6.2NA manifolds to feed them, pipe the inlets to a nice spot, and run the outlet either right up to the intake, or have a couple small intercoolers upfront. It is a lot of pipe if you run intercoolers, but still not out of the range of sanity.

Gunfreak has a good candidate for this type of setup, look at all the room he's got
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