Boost vs compression vs flow
Thread Starter
Instructor
Joined: Jan 2010
Posts: 166
Likes: 1
Boost vs compression vs flow
Hello guys
It's a friends C6Z Max effort project that we are working on right now, just wanted to take opinions and discuss topics on the build to see if we are on the right track or beyond
Build is..
Short block: forged LSX 427
Heads: PRC ls7 285 with TI valves
Compression: 9.6/1
Intake: 102 precision metal craft intake mid raised with 102 throttle body
Blower: F.2 (24 to 25 psi ) with DP cog system to avoid belt slippage issues
Fuel: C16 all day (no pump gas at all)
Cooling: M1 ALKY dual nozzle system
Now the question is
- Shall we bump up compression? Are we going to benefit if we did? Cause I feel we are at the low side with 9.6/1 right now and that the more we have compression the more acceleration we will get to turn the blower faster and fill up the cylinders
- shall we go with 2' inch headers and off road X pipes to the mufflers or add daul 3" inch cutouts? I've heard the more you free the outlets the more power you will make..
- what is the benifit of the 102 sheet metal intake over the stock? Cause I've seen people losing boost but making power with bigger intake and throttle body!
glad to learn and gain from your experience
It's a friends C6Z Max effort project that we are working on right now, just wanted to take opinions and discuss topics on the build to see if we are on the right track or beyond
Build is..
Short block: forged LSX 427
Heads: PRC ls7 285 with TI valves
Compression: 9.6/1
Intake: 102 precision metal craft intake mid raised with 102 throttle body
Blower: F.2 (24 to 25 psi ) with DP cog system to avoid belt slippage issues
Fuel: C16 all day (no pump gas at all)
Cooling: M1 ALKY dual nozzle system
Now the question is
- Shall we bump up compression? Are we going to benefit if we did? Cause I feel we are at the low side with 9.6/1 right now and that the more we have compression the more acceleration we will get to turn the blower faster and fill up the cylinders
- shall we go with 2' inch headers and off road X pipes to the mufflers or add daul 3" inch cutouts? I've heard the more you free the outlets the more power you will make..
- what is the benifit of the 102 sheet metal intake over the stock? Cause I've seen people losing boost but making power with bigger intake and throttle body!
glad to learn and gain from your experience
Burning Brakes
Joined: Jan 2012
Posts: 1,145
Likes: 30
From: Orlando FL
Losing boost and gaining power is a result from lost restriction, it's a good thing. On a turbocharged car boost is controlled by the wastegate so there will be no loss it will simply spin the turbo faster. On a blower the compressor spins at a fixed speed from the pulley and belt combo. With more compression you will make more power. Me for example my car is 13.8:1 compression E85 with a turbo (6psi) I made 837/741 on E85. Pretty efficient not spinning the compressor fast a lot of air in a lot out. Cam selection will also play a factor.
-Curtis
-Curtis
Melting Slicks
Joined: Mar 2006
Posts: 2,754
Likes: 380
From: South Florida FL
Losing boost and gaining power is a result from lost restriction, it's a good thing. On a turbocharged car boost is controlled by the wastegate so there will be no loss it will simply spin the turbo faster. On a blower the compressor spins at a fixed speed from the pulley and belt combo. With more compression you will make more power. Me for example my car is 13.8:1 compression E85 with a turbo (6psi) I made 837/741 on E85. Pretty efficient not spinning the compressor fast a lot of air in a lot out. Cam selection will also play a factor.
-Curtis
-Curtis
Burning Brakes
Joined: Dec 2007
Posts: 1,249
Likes: 31
From: Dyer IN
If your boost controller is set for 20psi, it'll get to 20psi and then start bleeding exhaust pressure out through the wastegate to maintain your desired boost levels. If you increase cubes, port heads, etc it'll just change how how the boost comes on.
Last edited by staticki; Jul 13, 2016 at 03:53 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
