Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Sponsored by:
Sponsored by: CARiD

Estimated HP and TQ

Thread Tools
 
Search this Thread
 
Old Apr 18, 2013 | 06:16 AM
  #1  
usc iroc's Avatar
Thread Starter
Junior Member
 
Joined: Feb 2013
Posts: 92
Likes: 0
From: South Carolina
Car: 89 Iroc
Engine: 383
Transmission: 700
Axle/Gears: 4.11
Estimated HP and TQ

Im sure you guys can give me a good estimate on the power of my combo.

383 SBC, HSR intake, 58mm TB, 24#inj, gutted stock MAF and airlids removed, ProComp 200 aluminum heads, Comp 276 roller cam, 1.5 roller rockers, 1 5/8" headers, 700 tranny, 9" w/ 4:11 gears (incase someone wants to through out some time slip estimates , 165 ECM, complete tuning hardware from Moates and TP.
Reply
Old Apr 18, 2013 | 11:30 AM
  #2  
1986Z28OWNER's Avatar
Senior Member
iTrader: (1)
 
Joined: Sep 2006
Posts: 962
Likes: 13
From: Canada
Car: 1979 Malibu
Engine: Blown LSx
Transmission: T56 Magnum
Axle/Gears: 9"/wavetrac/35's/3.70
Re: Estimated HP and TQ

Originally Posted by usc iroc
Im sure you guys can give me a good estimate on the power of my combo.

383 SBC, HSR intake, 58mm TB, 24#inj, gutted stock MAF and airlids removed, ProComp 200 aluminum heads, Comp 276 roller cam, 1.5 roller rockers, 1 5/8" headers, 700 tranny, 9" w/ 4:11 gears (incase someone wants to through out some time slip estimates , 165 ECM, complete tuning hardware from Moates and TP.
If I had to venture a guess I would say around 450-460hp, roughly the same torque.
Reply
Old Apr 18, 2013 | 12:14 PM
  #3  
heat seeker's Avatar
Senior Member
20 Year Member
iTrader: (5)
 
Joined: Mar 2005
Posts: 615
Likes: 27
From: Austin TX
Car: 89 Formula
Engine: 383 SBC/HSR
Transmission: 700R4
Axle/Gears: 3.73
Re: Estimated HP and TQ

What's your compression ratio? What exhaust setup are you running?
Reply
Old Apr 18, 2013 | 12:23 PM
  #4  
ASE doc's Avatar
Supreme Member
 
Joined: Apr 2010
Posts: 4,337
Likes: 29
From: Aurora, OR
Car: 87 IROC Z28
Engine: 355 cid TPI
Transmission: Custom Built 700R4 w/3,500 stall
Axle/Gears: QP fab 9" 3.70 Truetrac
Re: Estimated HP and TQ

Call Holley, or Comp Cams since you're running their parts and ask them. They'll ask all the right questions and Desk Top Dyno the combo, plus their technical department has some experience with this, and give you a rough estimate. I would say that assuming 10:1 C/R, 450-460HP is about right.
Reply
Old Apr 19, 2013 | 07:16 AM
  #5  
usc iroc's Avatar
Thread Starter
Junior Member
 
Joined: Feb 2013
Posts: 92
Likes: 0
From: South Carolina
Car: 89 Iroc
Engine: 383
Transmission: 700
Axle/Gears: 4.11
Re: Estimated HP and TQ

At least we are all on the same page. I was shooting for 450 so thats cool. Thanks for the input. Its not a unique combo so I figured someone would have a general idea.
Reply
Old Apr 20, 2013 | 07:11 PM
  #6  
ASE doc's Avatar
Supreme Member
 
Joined: Apr 2010
Posts: 4,337
Likes: 29
From: Aurora, OR
Car: 87 IROC Z28
Engine: 355 cid TPI
Transmission: Custom Built 700R4 w/3,500 stall
Axle/Gears: QP fab 9" 3.70 Truetrac
Re: Estimated HP and TQ

One thing that caught my attention is the 24lb injectors. Unless you're running a crazy high pressure fuel system like mine, these injectors are too small at that power level. 30lb much better.
Reply
Old Apr 20, 2013 | 10:55 PM
  #7  
usc iroc's Avatar
Thread Starter
Junior Member
 
Joined: Feb 2013
Posts: 92
Likes: 0
From: South Carolina
Car: 89 Iroc
Engine: 383
Transmission: 700
Axle/Gears: 4.11
Re: Estimated HP and TQ

Thanks for the tip...no I am running 43psi.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
angel2794
Theoretical and Street Racing
25
Mar 7, 2026 01:08 PM
skip91
Body
17
Sep 24, 2015 03:29 PM
ULTM8Z
DIY PROM
1
Sep 16, 2015 09:15 AM
bellez77
Body
14
Sep 5, 2015 08:39 PM
Trevor K
Tech / General Engine
14
Jul 12, 2001 01:44 PM




All times are GMT -5. The time now is 07:54 AM.