Hey guys I just bought back a K5 Blazer I was forced to sell years ago due to my divorce.

Anyway I am putting in a low mileage 5.3 from a '01 Silverado and want to do a single turbo setup. I already swapped out the stock cam for a '03 LS6 cam/springs/pushrods and also running 8.1 Marine injectors (42#). I am going to use stock Corvette LS3 manifolds (flipped & ceramic coated in/out) and put the turbo on the far passenger side of the motor.

I am also having a 4L80e rebuilt with all the good stuff to handle whatever I can throw at it, both power and towing. The converter is a stock type, but the higher stall version (should stall in the 2000 RPM range). The truck weighs about 4500 lbs without me/gear/etc. I plan on using it as a part time daily driver, some sand/mud/trail off-road, but mostly for towing my camping trailer. It has been lifted 4", 4.11 gears, 14 bolt rear posi end, 33x12.5x15 tires, etc.

I am looking at a T67 T4 .84 exhaust A/R. I am not looking to make all out power, if I want to go fast(er) I'd drive my Datsun instead. I want the boost to be in early (2000 RPM) since I will be towing and that is where the converter will stall. The engine will never see higher than 6,000 RPM (if even that high). Opinions?

I will have the turbo exhaust housing ceramic coated (inside & out). I also plan on running Snow Performance meth/water injection instead of an intercooler, but plan on keeping the boost around 8-10 psi max (maybe less) regardless.

I am open to suggestions. Please keep in mind I want the boost early and not looking to make a ton of boost. If you have another turbo suggestion, please list approx mm specs on compressor and turbine wheel inducer and exducer as well as exhaust A/R.

Thanks in advance.

 

try the master power t70 maybe with the .84 A/R that sounds about ideal for what you want. and if your on a budget this will do the pocket well.

 

Yeah the master power t70 or a Magnum would work well.

Is that T67 a garret turbo or Precision?

You could prob get the MP t70 or magnum cheaper, more bang for the buck.

 

8-10 # will probably be cutting it close w/8.1 inj. might think about 60#ers.

 

Why not super charge it instead of turbo. The supers work a little better for towing.

 

Garret T67.

Turbo for me is wayyy cheaper vs a supercharger since I'll be doing all the fab myself.

 

Check out Bill Ried's truck....he has real good luck with a T66 and his 5.3L.

 

Got a link?

 

IMO, (flame suit on) I think towing with a turbo can be potentially dangerous on a gas engine. The hot pipes just get so damn hot... REALLY hot when towing alot of weight for exteneded periods of time up hill. That must be taken into consideration when planning routing and ultimately what boost you plan to run while towing. There was another PT member with the same turbo kit (prototype) as mine that tried towing just from Phoenix to Prescott... not even close to the length of grade as, say, the Grapevine. He found that he could zip up the hill no problem only to open his hood and have part of his passenger plastic fenderwell melted away. When the hot side gets that hot... anything like dumping the crankcase pressure into the engine compartment, like a fill cap breather, becomes ignitable and fires have occurred. Turbo's can tow... its just the heat that is the problem both exterior and the hot *** exhaust gasses between the exhaust valve and turbine. This is pretty much why I do not tow anything heavy... like a car/car trailer. Now, you might do just fine if you limit the boost to around 5 psi for short periods of time up hill during tow conditions...

I think the T66 is a great turbo for the 5.3L. I have run a 60-1 P Trim and it was DAMN close to a Magnuson supercharger as far as boost repsonse is concerned but dies off around 5k RPM. I went with a T66 and a 3200 stall and I get boost response I want all the way to 6k RPM. Granted my 5.3L cam really does stand in the way of performance... why I have an LS6 cam on the shelf. I just need to install it If/when I were to do another stall I would back it down to about 2600. The MP70 is also a popular turbo but I have no experience with it. The T66 I run was a custom order from Turbonetics. Jose over at Forced Inductions speced my T66 with Turbonetics F1 turbine wheel (with .81 housing) which as I understand it is slightly larger than a Q-Trim wheel. It is also a journal bearing type water cooled turbo. Ball bearing would get you a little quicker response.

 

I feel like the heat issue should be cured fairly well if you coat and wrap the manifold/dp and throw a nice blanket on the exhaust housing.