dirtylark71

iTrader: (2)

Buddy picked up one of these for mega cheap, and I was just curious what kind of set up this could work on, or if anyone has had any experience ext.



Compressor Specs
Wheel Inducer Diameter: 75.8mm
Wheel Exducer Diameter: 102mm
Trim: 55
A/R: .60

Turbine Specs
Wheel Diameter: 82.0mm
Trim: 84
A/R: 1.25 or 1.47

stevieturbo

It'll work on many setups, just depends what your expectations are.

gtfoxy

Tad large IMO on the exhaust side A/R if this is a stock 5.3 with a LS1 cam. Also, what is the exducer on the turbine side?

dirtylark71

iTrader: (2)

It has 2 hotsides with it. I'll look on the exducer idk. It would be on my 5.3 build possibly. But I was going to do a 78/75 on3 deal. For cheap it's a quality turbo though so just seeing if it would vibe with my build possibly

dirtylark71

iTrader: (2)

gtfoxy

Measure the exducer, I'm curious what it is. What is your altitude & what kind of positive manifold pressure are you planning on running?

I would run it first with the 1.01 & see how the converter responds.

Garret lists that as having a 74.7mm inducer.

Nice turbo, congrats!

dirtylark71

iTrader: (2)

Still kinda new to the science behind picking a turbo. The hotside seems plenty big for a ls-style build. I'm curious about the compressor side? I'm ready to be schooled here...

Also my power goals are above 550whp at first, then bump up to 700ish as I go blowing motors up along the way. Just for reference

gtfoxy

I've looked over that page already. That's why I asked you what kind of manifold pressure you are wanting to run. That, along with a base lb/min engine flow rate is needed to find where "theoretically" in the compressor map you will be.

I can drudge through it with you but on the Garret website go to the tech where it explains reading compressor maps. It will tech you about in/out pressure ratios. Once you figure out the pressure ratios you can map your MAP vs Flow on the map.

I prefer to size turbos so I start at the low side of the high-efficiency island & sweep through it in the mid-range of the RPM band, under high boost, & move into the lower efficiency islands at the top end.

You will find that compressor really wants to be ran in the 2-2.5 pressure ratios around 60-75lb/min, peak. Which is about 15-16/22-23psi on a 5.3 assuming a 30lb/min @ standard atmospheric pressure.

gtfoxy

Add: on the exhaust side it gets a tad more complex as you need to calculate head flow, which is dynamically based off head balancing & cam timing, to find your available flow rate. Then you calculate enthalpy, based on EGT & flow rate, to pick the best turbine housing based on what kind of response you want to match the compressor side so you achieve a boost pressure based on your calculated flow rate through the engine. Then you can factor in wastegate flow required to bleed excess energy to prevent over/under boosting of the turbo.

At 74% max efficiency, that turbine wheel will work pretty well at using the available energy.

You need to know your atmospheric pressures you will be working with. It impacts compressor & turbine flow(with a free-flowing exhaust) so you know your calculated pressure ratios.

dirtylark71

iTrader: (2)

Badass! I'll have to play with it. It seems pretty interesting. It's a 3,000 dollar set up new, so it's worth a shot haha. Thanks for all the info man!

gtfoxy

Have fun with it. Remember, though, there's more ways than one to skin a cat. It all depends on want you want.

If what it works out to be is good for you, then enjoy it.

Project GatTagO

iTrader: (7)

It'll be fine. Run it!

Andrew

dirtylark71

iTrader: (2)

Word! I'm on it, gotta get it from my buddy now, worse case run a 78/75

coltboostin

How much are you getting it for is the question? If its around the pricing of the 78/75, and its a REAL Garrett BB unit, its stolen LOL or your buddy owes you money.

Its more than enough for your goals btw

dirtylark71

iTrader: (2)

Haha yeah man he got it for a hell of a deal, we are probably going to keep it around but I'll go with the 78mm vsracing turbo at first

gtfoxy

If running the stock cam I would try the Garret first, but that's just me.