What does it really take to go turbo?

I have been reading all I can get my hands on for the last three months and tried to not ask questions but find answers (aka I do use the search button). I am now at a point where Parts are going to be purchased and money is being spent and Making sure I make the right choice is important.

The main question is choosing the right turbo. I have been all over garretts web site and going by what I have read and also by what I was told, the proper way to choose a turbo was to do the calculations and look at the turbo map.

The truck is a 4.8, cam, LT, gears, yank3000, e-fans, CAI, custom diablo tune

It seems that most truck guys run 70 - 76mm. The calculations I have done land me at the GT3582R. specs are 56 trim and 0.82AR.

the other things I was more confident about (but still up for opinions) are:
Bosch 044 pump
60lb inj.
aeromotive fuel regulator
2.5" hot tubing
3.0" dt
31x12 intercooler
3.0" cold tubing
TiAL BOV/wastegate
Synergy tuning


All that being said I'm desperately looking for constructive advice or experiences.

Thanks in advance,
future member of the turbo club.

Get ahold of allen nelson, turbo mic, quik, casey23, those 4 know pretty much the worlds wealth of knowledge on turbo stuff :thumb:

I agree with that but didn't want to just send a bunch of pm's, cause you never know who else might chime in with that one piece of the puzzle you forgot. I home they make their way to this thread. I really look up to them for their knowledge and what they have done with their trucks.

The longtubes won't work for the turbo setup. They are made to dissapate heat quickly, which isn't good for turbo setups. Swap back to stock manifolds and sell the LT's to recoup some money. On a 4.8, I'd go with a 70 or slightly smaller. Who's hot pipes are you going with? Are you fabbing your own?

I know the long tubes wont work, that list is what I have now. I was going to use the stock manifolds reversed and inverted with the crossover in front of the motor. I will be building everything myself.

Why a 70? besides the reason it works or that's what so and so is running.
I'm not saying your wrong but, I'm pretty good with math and all the calculations plotted on the map say go bigger to stay in the higher efficiency areas.

There must be something I'm missing.

What will the truck be used for?

depending all your goals the smaller turbo maybe all you want to use. The size is determined by a few things, if you keep your setup below 6k theres no need for a huge turbo. you would want a turbo that is in boost early and out of it by redline. if you were out racing then more rpms feed larger turbos but that also comes with using biggest stalls, bigger cams, lower gears.

a 58mm will work well on a 4.8 for a nice daily, but one thing to think about for price of that 58 others just go larger as it gives them room to grow. However you want to stay away from compressor surge when going to large on turbo

The truck is the one you see in my avatar, its got 37's, 5.13gears but only a 6" lift. its not a huge truck. the main reason I'm doing this is to be able to run paddle tires when I go to the sand. I would like about to shoot for 500RWHP. The truck in the sand stays between 3000-5500 rpm but does hit 6k at times. One of my concerns is with sand there is a constant load for long periods at a time 15-30 of smashing. So the setup will have to be able to handle boost for a long time compared to the 1320 guys.

I was not aware it was on a monster truck lol. A 70mm really isn't that big. I mean it would probably be too big for you, since you'll be in lower RPMs more often than people who race. I just don't want you to run out of turbo.

For what You want 58mm is plenty, I'd be more concerned about sand then size of turbo

Correct me if I'm wrong this is just a theory. I can see more load being put on a turbo out playing in the sand with paddle tires so shouldn't he be able to get away with a bigger unit? More load on the motor the faster the turbo spools right?

There is quite a load in the sand. In the dirt the power I have does well and it's respectable onthe street. When I bolted 35" paddles on it became a turd. I'm not super concerned with spool time but I don't want to wait till tomorrow either. I was thinking bigger to be in the eficenty curve of the turbo as much as possible. But I under stand you can go too big. Im just confused as to why the numbers I come up with tell me to go so big.

I'd run somewhere around an 80+ mm on it. Run big everything for room to grow. Big crossover, wastegate, down pipe. Pm if u have any questions. Good luck with the build.

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Originally Posted by Frenchy

Correct me if I'm wrong this is just a theory. I can see more load being put on a turbo out playing in the sand with paddle tires so shouldn't he be able to get away with a bigger unit? More load on the motor the faster the turbo spools right?

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rpm range wil lstill be the same reguardless of size of turbo. if he staying from 1500-5500 then a smaller turbo with a larger AR will suit well. give him the powerband that he needs.

as for size of crossover and etc, look into thermal dynamatics on how sizing hot size plays huge role in spooling a turbo

I did some work for the guy that owns turbo hoses (the company that makes all the high end silicon hoses). I went by his shop and was going over what I was doing. He recommended the GT3582R and to go with the 1.06AR over the .82AR. he is giving me a bunch of stainless bends (2.5") for the hot side, and some misc. flanges he had laying around. So I guess Im going stainless. He said that turbo would leave me room to grow, as boost is a drug and you will always want more.

Also on a side note, aside from the turbo does everything else on my list seem properly sized or adequate?

I have read through this theater and even though there are some good answers here. You all forgot the main thing you need to do a Turbo and that is money money and more money lol
Donald

Id take tips from mid here I know he makes trips to glamis.... my left calf was owned by buttercup hill out at the dunes... 96 stitches...

I have had some bad trips to the dunes as well but something keeps taking me back. They also give new meaning to "beating the cr@p out of your stuff".

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Originally Posted by Jess

I have had some bad trips to the dunes as well but something keeps taking me back. They also give new meaning to "beating the cr@p out of your stuff".

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That ain't no joke...i lived in yuma for 3 yrs it was awesome...

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Originally Posted by LamboDoNoMo

Get ahold of allen nelson, turbo mic, quik, casey23, those 4 know pretty much the worlds wealth of knowledge on turbo stuff :thumb:

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I think this is the smartest thing you ever said G !!!! Lmao

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Originally Posted by casey23

I think this is the smartest thing you ever said G !!!! Lmao

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thanks man, just trying to nutswing with everyone else :LOL:

nah just everywhere i read on turbos, you guys usually pop up and have something to say, and not just on this site.

Casey23, what do you think size wise?

I've been trying to sell a turbonetics t-70 for a while now. Pm me if you're interested. I'll bump the thread in FS section if you wanna take a look. It's called the couldn't hack it sale.

What size engine were you running it on.

The reason I ask is that when you look at the compressor map for it, it is way to large.
In a turbonetics I would need a T-61.

With no reference to the last post, How many people actually use compressor maps?
It seems that many people just use whatever, and it will always work. Its just a matter of how well.

The issue with us using compressor maps is that many of us use these things daily and on the strip. We never know when we're going to go bigger. Most of us on this site (not only the turbo guys) go bigger to leave room for us to grow into.

i did for this build and it worked out well for my setup. i highly recomend that you size to the usage of your truck. no sense on putting a larger turbo on if you dont need it for your application

Quote:

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Originally Posted by Jess

What size engine were you running it on.

The reason I ask is that when you look at the compressor map for it, it is way to large.
In a turbonetics I would need a T-61.

With no reference to the last post, How many people actually use compressor maps?
It seems that many people just use whatever, and it will always work. Its just a matter of how well.

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It was a 9.5:1 5.7L. I really don't know what a compressor map is. Things nowdays seem to be getting extremely complicated.

There is a wealth of info on garrett's site, just go the turbo tech 101,102,and 103.

103 gets into the calculations and how to determine ho much air your motor really needs and how to size a turbo per your requirements. They also have an iphone app where it will even recommend turbos and plot your air requirements for you.

Rick from synergy is the one that told me I needed to size my turbo properly, and to do so I needed to do my homework and a bit of math.