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Turbo 2500hd 6.0

Turbo 2500hd 6.0

Postby rocksolidchevy03 [OP] » Oct 05 2011, 3:30pm

Hi im about to put a sts turbo kit on my 2003 3/4 ton hd and it recomends that you place your turbo just in front of the back tire therefore your air filter is in the same general vicinity which is fine and dandy to me however i tend to travel down dirt roads somewhat frequently and i dont think that would be good for the filter being placed right where basically all the dust goes. If anyone could help me i would greatly appreciate it. Im up for advice and opinions. Please and thank you for any and all.
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Re: Turbo 2500hd 6.0

Postby farside1 » Oct 05 2011, 3:40pm

Just so I understand this correctly: They are telling you to put the air intake for the turbo "under" the vehicle and NOT in the engine compartment? Where are they telling you to put the turbo itself? Do you have any diagrams of this install that you can upload?
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Re: Turbo 2500hd 6.0

Postby starspangled6.0 » Oct 05 2011, 3:45pm

I'm thinking those aren't the right directions. Every turbo setup I've seen has it all in the engine bay, tucked in nice and tight, away from any rocks or dust.
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Re: Turbo 2500hd 6.0

Postby rocksolidchevy03 [OP] » Oct 05 2011, 4:54pm

http://ststurbo.com/gm_trucks
scroll over where the picture is on the link and it will show you some trucks and then youll see how they do it. The turbo is under the bed on the exhaust and the filter is nearby. Almost all of the silverado ive seen with turbos on them are done this way but i travel down dirt road often like i said and idk if that would harm the amount of airflow and weather or not it will suck too much dirt into the air filter.
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Re: Turbo 2500hd 6.0

Postby Z71Silvy » Oct 05 2011, 5:24pm

For your application, I would suggest getting some intake tubing and simply relocating the filter all the way back up to the engine bay, this is a lot of tubing, but will get you clean, fresh air. Many turbo kits are moving to the rear portion of vehicles (aftermarket) to prevent heat buildup under the hood and prevent any problems with space. They even make kits like this for Corvettes. The presume that most gas turbo applications will not be seeing a lot of dirt.... but the routing described above should work well with minimal impact on performance.
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Turbo 2500hd 6.0

Postby 1stsilverado » Oct 05 2011, 10:35pm

If you have a tool box in the bed of your truck. You can drill a hole threw the floor and the box and mount it in there. Have to add additional hole in bottom of tool box. So the intake gets plenty of air.
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Re: Turbo 2500hd 6.0

Postby Luke300zx » Oct 05 2011, 11:14pm

I wouldn't use a rear mount turbo setup. Here's some pros and cons as to why

Pros: More space in engine bay, less heat in engine bay (barely), ease of access to change turbo in case it gets damaged

Cons: TURBO LAG (BIG ONE), damage from the elements (rain, grime, oil, rust, etc), long coolant/oil lines to the turbo so you have a greater potential for leaks to occur, and did I mention the turbo lag? lol
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Re: Turbo 2500hd 6.0

Postby Z71Silvy » Oct 06 2011, 12:21am

Luke300zx wrote:Cons: TURBO LAG (BIG ONE), damage from the elements (rain, grime, oil, rust, etc), long coolant/oil lines to the turbo so you have a greater potential for leaks to occur, and did I mention the turbo lag? lol



Any experience with the turbo lag? From the dyno charts I have gone through for Corvettes and other owners I have talked to, they have expressed it is minimal in a TWIN turbo setup simply due to the immediate volume of air that is moving. It is a very confined space in those pipes and when you step on it, the pressure builds quickly.

Engine bay is only deceptively safe from the same elements that it will face under the rear of a vehicle. The only difference should be direct deflection from the tires and dust kicked up by the tires as the OP is worried about.
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Re: Turbo 2500hd 6.0

Postby Luke300zx » Oct 06 2011, 12:48am

The only reason it's minimal in a twin turbo setup is because in a twin turbo setup you generally have 2 smaller turbos compared to another setup of a single big one. It might be minimal but it is very noticeable. Not to mention the reliability issue of throwing a turbo on these trucks, or any vehicle for that matter. You usually need a lot of supporting mods to handle this kind of power. Not sure how strong the internals on our trucks are because I've never built one but I know for my Z that I had that the weakest links in the motor were in the pistons (would break around 500hp) and the rods (would damage around 700 hp). However, if you purchased aftermarket pistons/rods and built the motor it could handle 1000+ rwhp, like I said though I'm not sure if it's the same situation as it is with our trucks.

The intake in the picture provided in the link above is just so debris doesn't get into the CHRA assembly of the turbo (the spinning part moving like 100,000 rpm's).

I forgot to mention, another problem with the rear mount setup is that there is no intercooler. Intercoolers are HUGE for getting the most power out of your turbo you can (colder air = dense air). Also, if the intercooler picture in the link has piping going from the front of the car to where the turbo is in the rear, then I'd say it looks like it will experience a lot of pressure drop. More pressure drop = harder turbo has to work to get said boost. The longer/more bends intercooler piping has the worse the pressure drop.
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Re: Turbo 2500hd 6.0

Postby Z71Silvy » Oct 06 2011, 1:04am

Durability of stock GM engine with turbo, I realize 4.8 is not the same as the 6.0:
http://www.hotrod.com/techarticles/hrdp ... ng_theory/

On this site - you're probably not going to find a ton of guys with a rear mount turbo, I suggest getting on LS1tech.com if you have not already, there is a guy on there that has found a way to greatly improve rear-mount kits.

http://www.ls1tech.com/forums/forced-in ... raphs.html

As for the dirt issue - a combination of a good filter, an external cover to block debris, and a fabricated airbox with a well routed intake tube should keep things clean.
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