Garret Gt4202R
Garret Gt4202R 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
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
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
TECH Enthusiast
Joined: Apr 2009
Posts: 723
Likes: 4
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!
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!
Last edited by gtfoxy; Dec 25, 2015 at 12:48 PM.
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
Trending Topics
TECH Enthusiast
Joined: Apr 2009
Posts: 723
Likes: 4
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.
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.
Last edited by gtfoxy; Dec 25, 2015 at 03:15 PM.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo TECH Enthusiast
Joined: Apr 2009
Posts: 723
Likes: 4
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.
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.
Last edited by gtfoxy; Dec 25, 2015 at 03:43 PM.
TECH Fanatic
Joined: Jun 2013
Posts: 1,163
Likes: 16
From: Avon, Ohio
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
Its more than enough for your goals btw