Throttle body

Tony_90fox · April 25th, 2007, 10:51 PM

If the TB opening on the intake is 70mm, do i want a 70mm Tb or a 65 mm? Sounds stupid but i have seen people run a size smaller on their intake and want to know what i should do,

JBIGBOOTSY · April 26th, 2007, 12:14 AM

Alot of engine builders will step intakes, TBs, heads so that there is less chance of "reversion", due to the starting and stopping of air as the valves open and close. I would think that after the plenum it really wouldent matter that much.

stang94 · April 26th, 2007, 06:10 AM

Do anyone of you know what size the opening of the TrickFlow Street upper intake?

ryanw · May 4th, 2007, 01:47 AM

Ive been told that if your not running a power adder or a HP cam that a 70mm may be to big.65mm i think is just right. but if you do have a power adder then go with a 70mm

ScratchinFerTraction · May 4th, 2007, 10:57 AM

Trickflow Street Heat is 75mm opening, I put 75mm throttle body (SUM-227215) and a Performance Mass Air Flow 75mm MAF.

Considering that I port matched my lower intake to the heads, it makes no sense to "step" the TB and loose that valuable effort. The upper intakes acting like an airbox should take care of what JBig was talking about.
Stan

stang94 · May 4th, 2007, 11:33 AM

Yep TFS is 75MM, thats intake, tb, and elbow if your a SN95

April 25th, 2007, 10:51 PM	#1
Tony_90fox MM Fanatic Join Date: Jun 2006 Location: Bowling Green, KY Posts: 3,445	Throttle body If the TB opening on the intake is 70mm, do i want a 70mm Tb or a 65 mm? Sounds stupid but i have seen people run a size smaller on their intake and want to know what i should do, __________________ Suck on it Trebek. Suck it long, suck it hard.

April 26th, 2007, 06:10 AM	#3
stang94 Hardcore Enthusiast Join Date: Oct 2006 Location: Jamaica, NY Posts: 1,005	Do anyone of you know what size the opening of the TrickFlow Street upper intake? __________________ FREE & FOR SALE 198x 351W Block - 90,xxx Miles (FREE) 94-98 GT Hood, 2 pr tail light - 1 Pr power mirror - FREE NEW - ENERGY SUSP Motor Mount POLY, RED ($100) NEW - Reserve Glow Blue/Green ($50)

May 4th, 2007, 11:33 AM	#6
stang94 Hardcore Enthusiast Join Date: Oct 2006 Location: Jamaica, NY Posts: 1,005	Yep TFS is 75MM, thats intake, tb, and elbow if your a SN95 __________________ FREE & FOR SALE 198x 351W Block - 90,xxx Miles (FREE) 94-98 GT Hood, 2 pr tail light - 1 Pr power mirror - FREE NEW - ENERGY SUSP Motor Mount POLY, RED ($100) NEW - Reserve Glow Blue/Green ($50)

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April 26th, 2007, 12:14 AM	#2
JBIGBOOTSY Hardcore Enthusiast 1990 LX hatch Join Date: Aug 2006 Location: Hobart Indiana Posts: 1,886	Alot of engine builders will step intakes, TBs, heads so that there is less chance of "reversion", due to the starting and stopping of air as the valves open and close. I would think that after the plenum it really wouldent matter that much.

May 4th, 2007, 01:47 AM	#4
ryanw Newbie Join Date: May 2007 Posts: 13	Ive been told that if your not running a power adder or a HP cam that a 70mm may be to big.65mm i think is just right. but if you do have a power adder then go with a 70mm

May 4th, 2007, 10:57 AM	#5
ScratchinFerTraction Newbie Join Date: Mar 2007 Posts: 38	Trickflow Street Heat is 75mm opening, I put 75mm throttle body (SUM-227215) and a Performance Mass Air Flow 75mm MAF. Considering that I port matched my lower intake to the heads, it makes no sense to "step" the TB and loose that valuable effort. The upper intakes acting like an airbox should take care of what JBig was talking about. Stan

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