Forced Induction Superchargers | Turbochargers | Intercoolers

Thoughts on 383 with SMALLER turbo?

Thread Tools
 
Search this Thread
 
Old May 18, 2009 | 08:10 AM
  #1  
ddnspider's Avatar
Thread Starter
10 Second Club
20 Year Member
Liked
Loved
Community Favorite
iTrader: (26)
 
Joined: Aug 2004
Posts: 14,628
Likes: 1,778
From: FL
Default Thoughts on 383 with SMALLER turbo?

For those not familar, my setup is a 9:1 383 w/ a T76GTS turbo, T56 w/ southbend clutch,ported LQ9's with smaller reverse split turbo cam, 3" DP tp 3.5" overaxle,etc. Running ~7psi car makes ~630rwhp. I like where the car is and how it runs and dont feel the need to turn up the boost.Car has great lowend and spools ~2500rpms.SO, with that in mind, if you were to plot it on a compressor map, its not even on the island since my pressure ratio isnt high enough for that turbo. My though is that i could swap to a smaller turbo (discussed with DR. Turbo and agreed on a TC72) and it would be more efficient thus making about the same power, but the turbo would light up like a light switch.I would venture to say almost like a roots type setup. Thoughts?
Reply
Old May 18, 2009 | 08:20 AM
  #2  
allngn_c5's Avatar
TECH Senior Member
iTrader: (3)
 
Joined: Apr 2006
Posts: 6,524
Likes: 1
From: Western Burbs of Detroit
Default

I say leave your setup alone. It sounds bad ***, as is.
Reply
Old May 18, 2009 | 08:46 AM
  #3  
moehorsepower's Avatar
TECH Addict
iTrader: (3)
 
Joined: Feb 2003
Posts: 2,334
Likes: 17
From: Texas
Default

Smaller turbo will spool up a little quicker, but is it worth the cost to go from a 76 to a 72?? It might be like going from a 3.23 rear gear to a 3.42. Not Much..
Reply
Old May 18, 2009 | 09:44 AM
  #4  
hellbents10's Avatar
LS1Tech Sponsor
iTrader: (10)
 
Joined: Mar 2004
Posts: 4,439
Likes: 4
From: Spring Lake, MI
Default

I would leave it alone, when do you race below 2500rpms??? Or do you plan on heavy towing?
Reply
Old May 18, 2009 | 09:49 AM
  #5  
1320's Avatar
TECH Fanatic
iTrader: (6)
 
Joined: Dec 2001
Posts: 1,114
Likes: 0
From: LV NV
Default

I would move the boost curve down on the 76, via a divided housing and quick spool valve first.
Reply
Old May 18, 2009 | 09:49 AM
  #6  
silverbeast's Avatar
TECH Fanatic
iTrader: (16)
 
Joined: Oct 2003
Posts: 1,456
Likes: 0
From: Ruffin,N.C.
Default

put a small shot of gas on it and let it eat,lol. i vote for leaving it alone as well. it would suck to spend the money and then the car make less power.
Reply
Old May 18, 2009 | 12:22 PM
  #7  
ddnspider's Avatar
Thread Starter
10 Second Club
20 Year Member
Liked
Loved
Community Favorite
iTrader: (26)
 
Joined: Aug 2004
Posts: 14,628
Likes: 1,778
From: FL
Default

I think it would be quite a difference between a Precision T76GTS and a TC72.
The car is 3900lbs with me in it.I guess my thought process was off idle and what not.Possibly better gas mileage being more efficient,etc. I do have a 2 step now for launching so i guess thats not a big deal.Just thinking i supppose.
Reply
Old May 18, 2009 | 12:34 PM
  #8  
98Z28CobraKiller's Avatar
Restricted User
iTrader: (17)
 
Joined: Nov 2005
Posts: 5,783
Likes: 5
From: WPB, FL
Default

Originally Posted by ddnspider
I think it would be quite a difference between a Precision T76GTS and a TC72.
The car is 3900lbs with me in it.I guess my thought process was off idle and what not.Possibly better gas mileage being more efficient,etc. I do have a 2 step now for launching so i guess thats not a big deal.Just thinking i supppose.
If you really want to spend some money to make your turbo setup "better", buy an automatic transmission.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

 Brett Foote
story-1

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-2

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-3

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-4

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

 Verdad Gallardo
story-5

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

 Pouria Savadkouei
story-6

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

 Verdad Gallardo
story-7

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-8

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-9

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
Old May 18, 2009 | 12:45 PM
  #9  
ddnspider's Avatar
Thread Starter
10 Second Club
20 Year Member
Liked
Loved
Community Favorite
iTrader: (26)
 
Joined: Aug 2004
Posts: 14,628
Likes: 1,778
From: FL
Default

Originally Posted by 98Z28CobraKiller
If you really want to spend some money to make your turbo setup "better", buy an automatic transmission.
thankyou for the wonderful insight

Last edited by ddnspider; May 18, 2009 at 12:51 PM.
Reply
Old May 18, 2009 | 12:53 PM
  #10  
ttranssam's Avatar
TECH Fanatic
iTrader: (10)
 
Joined: Oct 2007
Posts: 1,388
Likes: 0
From: plainfield,IL
Default

may be an idiot...but a smart one...
Reply
Old May 18, 2009 | 01:53 PM
  #11  
ddnspider's Avatar
Thread Starter
10 Second Club
20 Year Member
Liked
Loved
Community Favorite
iTrader: (26)
 
Joined: Aug 2004
Posts: 14,628
Likes: 1,778
From: FL
Default

yep, because thats the ticket.because EVERYONE wants an auto.Its not a track car, rarely sees the track,and i enjoy cruising in 6th on the highway @ 1800rpms getting 20+mpg.thanks though
Reply




All times are GMT -5. The time now is 03:48 AM.

story-0
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

Don't get dad new socks or a grill brush this year.

By Brett Foote | 2026-06-04 18:13:20


VIEW MORE
story-1
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-2
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-3
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-4
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-5
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-6
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-7
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-8
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-9
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