Forced Induction Superchargers | Turbochargers | Intercoolers

Help! Turbo Pick

Thread Tools
 
Search this Thread
 
Old Aug 1, 2013 | 01:16 AM
  #1  
Slider9751's Avatar
Thread Starter
Staging Lane
iTrader: (1)
 
Joined: Jun 2012
Posts: 50
Likes: 0
From: Vancouver, BC, Canada
Default Help! Turbo Pick

Ok, just to start off yes I have tried searching.

I am currently building a 1995 Z28 that I am swapping a 4.8 truck engine out of a 2000 silverado. The engine is in amazing shape despite the 270k kms on it. I am using an ls1 intake, ls6 valve springs and stock bottom. Wanting to run a single turbo but I would consider running twins. I was planning on doing 2.5" pipes into the merge into an ebay gt45. But after doing some more research I'm not sure how fast this turbo would spool on the little 4.8. Does anyone have an educated guess on when this turbo would spool?

I'm shooting for around 450rwhp and around the same amount of torque. But because its a daily driver I want the turbo to come on strong down low (around 2300rpm) and pull to 6500-7000rpm. Is there a turbo out there that could do this for cheap. And would the 2.5" hotside be too big? Aswell as a 2.5" coldside?
Thanks, Roger
Reply
Old Aug 1, 2013 | 05:11 AM
  #2  
Blackpanther99's Avatar
TECH Senior Member
iTrader: (8)
 
Joined: Sep 2012
Posts: 6,963
Likes: 4
From: Baytown, TX
Default

A gt45 should respond very well down low.
Reply
Old Aug 1, 2013 | 07:54 AM
  #3  
Twin turbo c5's Avatar
TECH Enthusiast
 
Joined: Oct 2012
Posts: 581
Likes: 0
From: Arkansas
Default

Gt45 will work great and there not expensive.
Reply
Old Aug 1, 2013 | 07:59 AM
  #4  
Ryans99ls1's Avatar
TECH Fanatic
15 Year Member
Liked
Loved
Community Favorite
iTrader: (16)
 
Joined: Dec 2007
Posts: 1,594
Likes: 271
From: OH & MI
Default

You could run 2.25" crossover pipes or hell even 2" pipes to help it spool earlier. Keep the coldside to 3"
Reply
Old Aug 1, 2013 | 12:11 PM
  #5  
mrstepheneades's Avatar
TECH Fanatic
 
Joined: Mar 2011
Posts: 1,916
Likes: 8
From: Statesville, NC
Default

Originally Posted by Ryans99ls1
You could run 2.25" crossover pipes or hell even 2" pipes to help it spool earlier. Keep the coldside to 3"
Yeah I used 2.5 crossover and I probably loss some spool time there also. For no more power goal than that id use 2" crossover lol.
Reply
Old Aug 1, 2013 | 01:37 PM
  #6  
willizm's Avatar
9 Second Club
iTrader: (10)
 
Joined: Apr 2009
Posts: 1,230
Likes: 3
From: Joliet,IL and Las Vegas 50/50
Default

a TC78 would be a good affordable choice as well. It will spool quick and since you are SBE you won't choke the turbo by pushing more boost.
Reply
Old Aug 1, 2013 | 01:39 PM
  #7  
flcamero's Avatar
Teching In
 
Joined: Aug 2009
Posts: 5
Likes: 0
Default

Originally Posted by willizm
a TC78 would be a good affordable choice as well. It will spool quick and since you are SBE you won't choke the turbo by pushing more boost.
+1 quick spool is worth it's weight in gold. Big turbo's bite for daily driving.
Reply
Old Aug 1, 2013 | 01:42 PM
  #8  
mrstepheneades's Avatar
TECH Fanatic
 
Joined: Mar 2011
Posts: 1,916
Likes: 8
From: Statesville, NC
Default

Originally Posted by flcamero
+1 quick spool is worth it's weight in gold. Big turbo's bite for daily driving.
But they rule the highway runs
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Aug 1, 2013 | 01:46 PM
  #9  
willizm's Avatar
9 Second Club
iTrader: (10)
 
Joined: Apr 2009
Posts: 1,230
Likes: 3
From: Joliet,IL and Las Vegas 50/50
Default

Yeah but if he's only pushing modest boost levels on a SBE then I'd think quick response would be more important since he will probably only push 8psi
Reply
Old Aug 1, 2013 | 06:56 PM
  #10  
Slider9751's Avatar
Thread Starter
Staging Lane
iTrader: (1)
 
Joined: Jun 2012
Posts: 50
Likes: 0
From: Vancouver, BC, Canada
Default

Thanks a lot guys. I'll stick with the gt45 and run a 2.25" merge to get a better spool but still have a little more pipe if I wanna turn up the power later on. I'll also run the 3" cold side. Thanks again guys.
Reply
Old Aug 1, 2013 | 07:02 PM
  #11  
Blackpanther99's Avatar
TECH Senior Member
iTrader: (8)
 
Joined: Sep 2012
Posts: 6,963
Likes: 4
From: Baytown, TX
Default

It will be a fun daily! I can guarantee you that! Lol
Reply




All times are GMT -5. The time now is 07:11 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE