Question- Porting TB
Burning Brakes
Joined: Apr 2016
Posts: 1,121
Likes: 110
From: Chattanooga TN
I would like to know this answer. I installed a AFE air filter stock intake with a intake shroud, didn't have any problems. But after I put a Ported TB on I keep throwing codes P0171 and P0174. Both are running to lean Bank 1 & Bank 2. I'm going to have my tuner look at it when he install my headers, cam, other stuff and dyno.
Race Director
Joined: Dec 2013
Posts: 12,505
Likes: 3,634
Hence GM designed the TB that shape not for just the best initial response, or just the best flow at WOT, but drive-ablitly across the board of it's full range instead.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
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
Melting Slicks
Joined: Jun 2006
Posts: 2,500
Likes: 261
From: Miami Florida
I do porting on GM DBW throttle bodys and found that tuning not require but I do know will help as 25% throttle and below range air intake increases quite a bit and while the trims will in time take care of this it will also be gone the minute you disconnect the battery.
Sense the OP is also adding a cold air intake he will benefit even more from a tune still may not be require but I highly recommend it.
I have a Vararam and my tuner tuned the car on the street under way and he noticed an air fuel difference at speed he had to compensate for at varied speed range to take full advantage of the Vararam design.
Sense the OP is also adding a cold air intake he will benefit even more from a tune still may not be require but I highly recommend it.
I have a Vararam and my tuner tuned the car on the street under way and he noticed an air fuel difference at speed he had to compensate for at varied speed range to take full advantage of the Vararam design.
Race Director
Joined: Dec 2013
Posts: 12,505
Likes: 3,634
Anyone got flow rates of a stock TB and ported TB through the entire ranges of the TB vane by percentages opened?????
Its not only the 1% and 100% flow rates that I would like to see, but the in between percentages of what the TB's are flowing instead.
Hence if the ported TB at some point is actual flow dipping from turbulence in flow as it opened up to a certain percentage do the removal of the air flow shaping sections, instead of a clean linear climb in flow as the TB is being percentages opened up instead.
Its not only the 1% and 100% flow rates that I would like to see, but the in between percentages of what the TB's are flowing instead.
Hence if the ported TB at some point is actual flow dipping from turbulence in flow as it opened up to a certain percentage do the removal of the air flow shaping sections, instead of a clean linear climb in flow as the TB is being percentages opened up instead.