Alright fellas, I'm wanting to throw a little turbo on my 02 flex fuel Sierra for a bump in torque/HP. I was wanting to run a s366 or s369 as I know they respond well on these trucks.. I found a billet 372sxe for a good price and was wondering how it would respond? Truck is my daily for work, mostly hauling tools and occasional trailer. I live at 8000 ft up in Colorado.Has a 208/214 112 cam, but mostly stock. I think I'm going the Huron t4 kit unless there's better options?
I have an 80e when the time comes. Really just wanting more get up and go with a little room to turn it up if needed. Not looking for all out horsepower, but under the curve shifting at a max if 6000 rpm. Just wanting to pick the experts brains on the turbo and If there's better options on the hot/cold side kit? Thanks guys

 

What size turbine?

I ran a BW S475/83 on a stock LQ4 for several years towing and Daily Driving. Got over 320,000 miles on that turbo now and bearings are a little too loose for my liking. So sending it in to be rebuilt.

With a stock 4L80E converter, 3.42 gears and a 31" tire, it wasn't a perfect setup to race from red light. But it got a heavy trailer moving and would hold 70mph thru hills like it was nothing.
I never got to try a smaller turbo on it cause it was my only ride haha.

My next setup is going to be a S475/96 on a 370 for towing and such in a 2500hd when I get time.


Only reason I'd be worried about a small turbine for what your doing is the back pressure. I'm going with a turbine that's a good bit bigger to try and see if letting it get the exhausts out with less drive pressure helps power in the 2000-2500 rpm range. ​​​

 

Not sure why my last post was taken down? Anyway it's a 80mm turbine, .88 a/r. I can always swap housings at a later date if needed due to back pressure. Seems since 366's and 369's get some heavy cars moving quick this one would work well, and have a little headroom in case I wanted to turn it up a notch at some point.
Here's the specs..

Compressor SpecificationsCompressor Type: Forged-Milled Wheel (FMW) Extended TipCompressor Wheel OD (Exducer): 91mmCompressor Wheel Inducer: 72.00mmMax Flow Rate: 111 lb/minMax Recommended Turbo Shaft Speed: 111412 RPMCompressor Housing Connections:Inlet: 4.0″ Hose CouplerOutlet: 2.5″ Hose CouplerTurbine SpecificationsTurbine Type: Inconel S300SX Turbine WheelTurbine Wheel OD: 80mmHousing Material: D5S sandcastHousing Size and A/R ratio: S300SX-E 9680 (S372) is available in three (3) different turbine housing configurations:0.88 A/R T4 Single Scroll0.91 A/R T4 Twin Scroll1.00 A/R T4 Twin Scroll

 

Yea that thing should light off pretty fast.
throw it on there and give us a report!

 

Where are you picking up the turbo? Asking for a friend 😇

 

Im getting it from a friend locally that just had it refurbished by borg. How low rpm do you guys think this thing would start to build?

 

Im no turbo expert, but Im going to guess ~3k. Maybe 2800ish. Depends on weight, gears, tires, cam, exhaust

 

For towing with the TC locked? I'd say 1500ish.
My old setup with the 6.0 and S475 I could make 8-9psi at 2000 no problem. Never tried for more than 10 tho.


In 1st gear prolly 3200-3500. There's one way to find out!

 

Sounds perfect honestly. What do you guys recommend for complete kit? Hurons seems really nice

 

Ya trucks pretty heavy with tools all time. So that should help. I'd say over 7000 lbs. I was hoping it would light quick, but still be able to put out the stream if I turned it up.