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Old February 10th, 2013, 07:47 PM   #1
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Default School me on turbochargers

I've been contemplating building a turbo motor for quite some time, but am still kinda lost on what turbo i need. There are 100s of models, sizes, and compressor maps to choose from and i need a hand picking one that works for me. What i want is 8-10 psi on a 364 inch motor from a single turbo that will be intercooled. I'm more looking at buying a used one from a factory application and adapting it to my setup. I may consider 2 smaller turbos i lieu of one larger one if i could find a matching set.
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Old February 10th, 2013, 08:05 PM   #2
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Old February 11th, 2013, 06:39 AM   #3
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I guess one question that needs to be answered is what is the intended use for the engine? Low end quick spooling torque, high horsepower slow boosting? That is the extent of my turbo knowledge. I will be watching to learn as this goes.
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Old February 11th, 2013, 06:48 AM   #4
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This is all you need to know.

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Old February 11th, 2013, 07:56 PM   #5
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Originally Posted by Coyote Red View Post
I guess one question that needs to be answered is what is the intended use for the engine? Low end quick spooling torque, high horsepower slow boosting? That is the extent of my turbo knowledge. I will be watching to learn as this goes.
i guess something right in the middle of the 2. I'm not looking to rotate the earth, just pick up some extra HP. This is budget minded as well. I know i will have to spend some money on fueling and computer tuning to make it all work. So i really don't wanna spend up to 2000 on just a turbo from garrett or turbonetics.
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Old February 11th, 2013, 08:07 PM   #6
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Old February 11th, 2013, 08:18 PM   #7
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Quote:
Originally Posted by Kodiak450r View Post
i guess something right in the middle of the 2. I'm not looking to rotate the earth, just pick up some extra HP. This is budget minded as well. I know i will have to spend some money on fueling and computer tuning to make it all work. So i really don't wanna spend up to 2000 on just a turbo from garrett or turbonetics.
Budget minded and turbos don't really fit in a sentence. I'm going to assume you mean this relative to what is necessary for a turbo setup.

Not that I can answer your question, but pose some others for thought:

1. What is your desired Initial compression ratio (static and/or dynamic)?
2. What you want to run for fuel and how you will fuel it?
3. How much are you really looking to spend?
4. What are your aspirations on power?

It is worth looking around on the diesel sites (Cummins forum and competition diesel for example) about how to understand the turbo maps wheel sizing, a/r, etc. Once you really set some parameters there are plenty of people that know way too much about turbos there. There are some really good write ups on choosing a turbo. It should be applicable to gas motors (with the right changes in calculations. I doubt you are going to try to build a 16:1 motor)

One other possible route is to look for two smaller turnouts like you said. if you could find an oem application that uses similar rpm ranges, motor volume and psi for your goal (so for example, two 2.5l motor turbos that make 6 psi with a redline of 6500 rpm in a 5.0L setup), you might be able to make something work.

You could also try a oe turbo off of a diesel, say off of a early dodge, but it might make your motor laggy? I'm not sure what the differences in rpm would do for the motor or displacement of air/fuel.

I realize I did not add much to the discussion...
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Old February 11th, 2013, 08:32 PM   #8
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well i suppose i should just put it out there this will hopefully be going on my 06 2500HD chevy 6.0. i had thoughts originally to supercharge it but at 6000 bucks for a universal roots supercharger that won't work with my gen 3 heads i said forget it. i know i could cram 8 psi into it safely without changing pistons or anything else. i would expect around a 100 horse gain with the right setup and tuning. i am more looking for gains above 2500 rpm. the one downfall to LS engines is the peak torque is around 4000 which is hardly usable while towing. Very few aftermarket companies make power adders specifically for my truck that are reasonably priced.

I figure if i could buy a decent turbo for around 5-800 with wastegate, upgrade the injectors, make exhaust and intake tubing, and buy a used intercooler, then tune it for less then 3000 i'd be happy.
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Old February 11th, 2013, 08:36 PM   #9
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Quote:
Originally Posted by Kodiak450r View Post
well i suppose i should just put it out there this will hopefully be going on my 06 2500HD chevy 6.0. i had thoughts originally to supercharge it but at 6000 bucks for a universal roots supercharger that won't work with my gen 3 heads i said forget it. i know i could cram 8 psi into it safely without changing pistons or anything else. i would expect around a 100 horse gain with the right setup and tuning. i am more looking for gains above 2500 rpm. the one downfall to LS engines is the peak torque is around 4000 which is hardly usable while towing. Very few aftermarket companies make power adders specifically for my truck that are reasonably priced.

I figure if i could buy a decent turbo for around 5-800 with wastegate, upgrade the injectors, make exhaust and intake tubing, and buy a used intercooler, then tune it for less then 3000 i'd be happy.
Not to bash the build, but couldn't you change the torque curve with a custom cam and some good tuning on premium? Spend about a grand to 1500 and no lag?
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Old February 11th, 2013, 09:10 PM   #10
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Not to bash the build, but couldn't you change the torque curve with a custom cam and some good tuning on premium? Spend about a grand to 1500 and no lag?
Unfortunately no...
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Old February 11th, 2013, 09:11 PM   #11
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Quote:
Originally Posted by Kodiak450r View Post
well i suppose i should just put it out there this will hopefully be going on my 06 2500HD chevy 6.0. i had thoughts originally to supercharge it but at 6000 bucks for a universal roots supercharger that won't work with my gen 3 heads i said forget it. i know i could cram 8 psi into it safely without changing pistons or anything else. i would expect around a 100 horse gain with the right setup and tuning. i am more looking for gains above 2500 rpm. the one downfall to LS engines is the peak torque is around 4000 which is hardly usable while towing. Very few aftermarket companies make power adders specifically for my truck that are reasonably priced.

I figure if i could buy a decent turbo for around 5-800 with wastegate, upgrade the injectors, make exhaust and intake tubing, and buy a used intercooler, then tune it for less then 3000 i'd be happy.
Stock 6.0?


I can help you with what you need just need to know a few things...

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Old February 11th, 2013, 09:18 PM   #12
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yea stock for now. tax money comes in i'll be changing a few things like exhaust and a tune.
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Old February 11th, 2013, 09:26 PM   #13
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Quote:
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yea stock for now. tax money comes in i'll be changing a few things like exhaust and a tune.
Honestly change out the rod bolts to ARP...

I know a real good A2A cooler for sale...


You can use your stock exhaust manifolds by just flipping them around and making the cross over yourself...
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Old February 11th, 2013, 10:03 PM   #14
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There's lots of good info on this, on f-body web boards, of ppl twin turboing those cars. Honestly, any reason not to sell this truck, get the tax money and buy a diesel, that you know is right, runs good, pulls great, and is above all, reliable?
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Old February 11th, 2013, 10:19 PM   #15
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There's lots of good info on this, on f-body web boards, of ppl twin turboing those cars. Honestly, any reason not to sell this truck, get the tax money and buy a diesel, that you know is right, runs good, pulls great, and is above all, reliable?
You can make his 6.0 very realiable with tons of useable power for what he needs it to do... Unless he wants to start ripping houses off their foundations...
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Old February 12th, 2013, 08:51 PM   #16
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I wouldn't drive a back yard engineered turbo set up 6.0 gasser, pulling a trailer any great distance. Id be sitting there the whole time waiting to hear what the last moments of an ls motor sounds like. Lol, but what ever blows your hair back i guess.
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Old February 16th, 2013, 09:46 AM   #17
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I dont think turbo would be worth it for what your looking for. there is alot to building a a turbo setup and doing it right. stuff adds up fast. Fuel pump,injectors,regulator,exhaust,wastegate,blow off vavle, fiding turbos.

I think you would have a hard time buidling a turbo setup for 3k.

Me personally would put
Headers/and exhaust
Cam and Valve springs
and tune it. If really wanted to get some decent heads for it or do a little work to what you have.
should have no problem picking up a extra 100hp with those mods.
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Old March 14th, 2013, 05:08 AM   #18
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Pro-charger is the way to go. Turbo setups need to run leaner at idle/no boost/crusing speeds. They need to run richer at full throttle under a load also. If you throw a manual behind the engine it means the motor will see boost and no boost conditions all the time which means you will need a better stand alone computer also. Even though you will still need one.

Pro-chargers are easier and cheaper in the long run to setup, be efficient, and easier to tune right. Also alot easier to change power wants/needs for your setup. Many variables to consider on this one. Start looking at how much it will be to just build the exhaust side of the turbo situation and you will change your mind on turbos on gas engines
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