CNC ported TB VS hand polished TB - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

1985airborne · 03-24-2012, 05:57 PM

Whats the difference in performance and HP between the two?

The Stig · 03-24-2012, 06:15 PM

polishing the inside of a TB actually hurts airflow first off, and the VMax ported TB is proved to be the best on the market.

Bo White · 03-24-2012, 08:17 PM

Same difference as with hand ported cylinder heads and CNC cut ones.

Brianskeet · 03-24-2012, 09:01 PM

You have hit on a subject that has seen a lot of trafic. The short version is the VMax CNC ported throttle body is 100% repeatable due to the accuracy of modern CNC machinines. They did the R&D time to come up with a porting job that produces fantastic throttle response and yes some power. No porting job will produce huge power it is just not possible, but VMax produces what is available. The much more valuable part of the porting is crisp precise throttle response. I saw it as part of a "breathing package" for my LS motor. Intake, scoop, washer relocate, and ported throttle body. That took care of the inhale. ARH long tubes and Corsa took care of the exhale.

briancb1 · 03-25-2012, 11:13 PM

The engine wont care how the shape was made. The whole point of having a CNC program is repeatability and time - its highly repeatable and takes practically "no" time compared to performing the action by hand.

And FYI NASCAR heads do the initial porting on a CNC and they finish off the porting by hand... there are just certain spots the CNC machine cant reach very well.

Matt @ FSP · 02-12-2013, 05:04 PM

All the VMAX throttle bodies are CNC spiral ported for consistency. Not saying hand-ported ones do not work, but there is always a human error factor involved. Actually out of the hand-ported TB's my first choice would be Bo White...

Back to back dyno graphs comparing Stock to VMax.

03-24-2012, 05:57 PM	#1
1985airborne NOT GIVING ONE F&*K Drives: BLACK SS 2010 & 2009 SUBURBAN Z71 Join Date: Mar 2010 Location: NC NJ NY DMV Posts: 687	CNC ported TB VS hand polished TB Whats the difference in performance and HP between the two? __________________ L99 W/TVS2300 W/COG DRIVE, HENNESSEY CAI, ARH HEADERS, CORSA EXHAUST, RX DV CC, ZL1 6 PISTON BRAKES, CTS-V ROTORS, ZL1 FRONT AND REAR SWAY BARS, MSD FVBP, ZR1 3BAR MAP SENSOR, ID 850's, PCM TRANS COOLER, YANK 2800, JRE ST, MELLING HV OP, ECS BIG BLOWER CAM, PAC SPRINGS, GM CNC PORTED HEADS, C5R TC, ARP HEAD/CAM/CRANK BOLTS, COMP CAM TRUNION UPGRADE, LS9 HEAD GASKETS, ZL1 FUEL PUMP, NGK TR7, 160 TSAT, GOODRIDGE STAINLESS STEEL BRAKE LINES, RETRO SS EMBLEMS, GM BLADE DOVE TAIL SPOILER, HEAD LIGHT ARMOR STEALTH HEAD/SIDE/REAR LIGHTS, ZL1 ACCEL/BRAKE PEDALS, H.U.D., NITTO 555R 592HP 699RWTQ

03-24-2012, 06:15 PM	#2
The Stig knows 2 facts about ducks Drives: ...and they're both wrong Join Date: Aug 2009 Location: The HMS Invincible Posts: 26,697 View My Garage	polishing the inside of a TB actually hurts airflow first off, and the VMax ported TB is proved to be the best on the market. __________________

03-24-2012, 09:01 PM	#4
Brianskeet Brianskeet Drives: RJTC 1SS RS L99 Join Date: Sep 2010 Location: Crestview FL Posts: 818 View My Garage	You have hit on a subject that has seen a lot of trafic. The short version is the VMax CNC ported throttle body is 100% repeatable due to the accuracy of modern CNC machinines. They did the R&D time to come up with a porting job that produces fantastic throttle response and yes some power. No porting job will produce huge power it is just not possible, but VMax produces what is available. The much more valuable part of the porting is crisp precise throttle response. I saw it as part of a "breathing package" for my LS motor. Intake, scoop, washer relocate, and ported throttle body. That took care of the inhale. ARH long tubes and Corsa took care of the exhale. __________________ ARH 1 7/8 coated LT, High flows, Corsa L99 exhaust, Vmax CNC throttle body, Elite Engineering catch can and tunnel brace, C.A.I. Apex Washer relocation and scoop, Janetty Tune, MSD wires, DEI heat shields, RB rotors and pads, Mike the powder coater calipers, pedders lines, Forgestar F14's, Gorilla nutz, MTI spoiler finished by Gary, Gary's Customz Bow Ties, Side Markers and Tails tinted, Bezels matte black, Badges deleted, Windows Tinted, AAC DRL P13W lights, AAC tinted LED reverse lights, AAC LED interior lights, RPI match painted DRL Bezels, Lis plate frame, Lloyds mats

02-12-2013, 05:04 PM	#6
Matt @ FSP Drives: 2011 Camaro SS Join Date: Dec 2012 Location: Bradenton, FL Posts: 2,497	All the VMAX throttle bodies are CNC spiral ported for consistency. Not saying hand-ported ones do not work, but there is always a human error factor involved. Actually out of the hand-ported TB's my first choice would be Bo White... Back to back dyno graphs comparing Stock to VMax. Attached Images

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03-24-2012, 08:17 PM	#3
Bo White Account Suspended Drives: 2010 Summit White 1SS Join Date: Feb 2012 Location: Vance Alabama Posts: 2,418	Same difference as with hand ported cylinder heads and CNC cut ones.

03-25-2012, 11:13 PM	#5
briancb1 Drives: C6 Z06 Join Date: Nov 2010 Location: Houston TX Posts: 106	The engine wont care how the shape was made. The whole point of having a CNC program is repeatability and time - its highly repeatable and takes practically "no" time compared to performing the action by hand. And FYI NASCAR heads do the initial porting on a CNC and they finish off the porting by hand... there are just certain spots the CNC machine cant reach very well.