Reasurance?

StangBanger302 · March 2nd, 2011, 09:57 PM

Someone reasure me that I don't have the wrong idea, and that all these guys are just jackass'....Coulda swore I read that bigger is better when it comes to airflow in the intake tubing,MAF and throttle body department... SMALLBLOCKPOSSE....The Innovators,Not The Imitators!!: GT40 Manifold question

ryanw · March 2nd, 2011, 10:30 PM

Ya im not sure what to believe....The things ive heard here are different then what i read in a mustang mag about 11+ years ago. Again it was 11+ years so i dont remember every thing i read but it went some thing like this

It was about throttle body sizes...............

They dyno a almost stock engine starting with a 65mm 70mm and 75mm
Why they didnt dyno a 80-90mm throttle body. Idk maybe they wernt around or they werent that common for the average guy to use....(back then)

It said that on a stock engine 65mm was all that was needed. And 70-75mm was agood choice if you had aftermarket cam, heads and intake. ( meaning that the engine needed to be able to pull in more air and get rid of it, to benefit from a larger TB.

They showed a loss in HP with the 70 and 75 on a stock motor. They explained why that was but i cant remember...I thought it had somehting to do with air being pulled over the throttle plate in the throttle body

Damn i wish i had kept that mag so that i could post the correct info...

but i guess you cant believe every thing you read ...lol

But On this forum every one said to run as big as the opening is on your intake.....Fuck if i know

fogged306 · March 3rd, 2011, 01:25 AM

Those guys are idiots. The OEMs have been doing large TBs on smaller cube engines for years now. I believe the trailblazer 6cylinder engines have something like over an 80MM TB just as an example. There's a ton of examples like this that I've seen.

sonataking05 · March 3rd, 2011, 03:50 AM

I have a basically stock (pulleys, shorty headers, 2.5 exhaust) and I swapped to an Explorer intake (same as GT40 just not sheet Metal) I matched the TB opening as best I could for a 75 MM throttle body I found at a junkyard. It may be a little too much for my motor now but as I add more to it It will be worth it in the long run. @ryanw is right, I believe I read a TB comparison in MMFF a long time ago that did say that a huge TB on a relatively stock engine may lose some HP and Torque but if your going to do any more to your car the mod now saves you $$$ in the future. Also I used TB gassett to hone the opening on the intake and tapered it in towards the intake as I went. Good Luck

StangBanger302 · March 3rd, 2011, 07:45 AM

I'm just not going to give technical advice over there anymore. They're all G.I.T.P. I don't see how getting a bigger MAF and intake/TB would make you lose power??? People get bigger cylinder heads for more power, same thing in this situation...

Rascus · March 3rd, 2011, 08:32 AM

I think it has to do with velocity on the 5.0's. Also, if they are doing a large TB on a bone stock intake, the intake opening may be small enough to have a lip the that would create a restriction in flow. The reason it's not the same as your cylinder head example, is that the cylinder heads on the 5.0's are the cork in the airflow. Say you have a 355ml bottle and a 2L bottle of water, the 2L bottle isn't going to flow anymore water out of it because it is pouring out of the same size hole as the 355ml, even though the opening up to the hole is larger. Putting on aftermarket heads is cutting the top off the bottle.

69fastback · March 3rd, 2011, 08:40 AM

Originally Posted by sonataking05

I have a basically stock (pulleys, shorty headers, 2.5 exhaust) and I swapped to an Explorer intake (same as GT40 just not sheet Metal) I matched the TB opening as best I could for a 75 MM throttle body I found at a junkyard. It may be a little too much for my motor now but as I add more to it It will be worth it in the long run. @ryanw is right, I believe I read a TB comparison in MMFF a long time ago that did say that a huge TB on a relatively stock engine may lose some HP and Torque but if your going to do any more to your car the mod now saves you $$$ in the future. Also I used TB gassett to hone the opening on the intake and tapered it in towards the intake as I went. Good Luck

That's enough to discredit the whole thing right there....

horsepowerjunkie · March 3rd, 2011, 04:56 PM

I've always heard the bigger the better on the MAF & intake pipping. I beleive TB should be sized according to engine size. IMO

March 2nd, 2011, 09:57 PM	#1
StangBanger302 Hardcore Enthusiast 1992 Mustang LX 13.0 @ 105 Join Date: Jun 2010 Location: New York Posts: 2,230 iTrader: 0 reviews	Reasurance? Someone reasure me that I don't have the wrong idea, and that all these guys are just jackass'....Coulda swore I read that bigger is better when it comes to airflow in the intake tubing,MAF and throttle body department... SMALLBLOCKPOSSE....The Innovators,Not The Imitators!!: GT40 Manifold question __________________ As I lay rubber down the street I pray for traction I can keep But if I spin, and begin to slide Please dear God, protect my ride

March 2nd, 2011, 10:30 PM	#2
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	Ya im not sure what to believe....The things ive heard here are different then what i read in a mustang mag about 11+ years ago. Again it was 11+ years so i dont remember every thing i read but it went some thing like this It was about throttle body sizes............... They dyno a almost stock engine starting with a 65mm 70mm and 75mm Why they didnt dyno a 80-90mm throttle body. Idk maybe they wernt around or they werent that common for the average guy to use....(back then) It said that on a stock engine 65mm was all that was needed. And 70-75mm was agood choice if you had aftermarket cam, heads and intake. ( meaning that the engine needed to be able to pull in more air and get rid of it, to benefit from a larger TB. They showed a loss in HP with the 70 and 75 on a stock motor. They explained why that was but i cant remember...I thought it had somehting to do with air being pulled over the throttle plate in the throttle body Damn i wish i had kept that mag so that i could post the correct info... but i guess you cant believe every thing you read ...lol But On this forum every one said to run as big as the opening is on your intake.....Fuck if i know __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

March 3rd, 2011, 03:50 AM	#4
sonataking05 Newbie 1988 Mustang LX 5.0 ???? Join Date: Oct 2010 Location: MA Posts: 41 iTrader: 0 reviews	I have a basically stock (pulleys, shorty headers, 2.5 exhaust) and I swapped to an Explorer intake (same as GT40 just not sheet Metal) I matched the TB opening as best I could for a 75 MM throttle body I found at a junkyard. It may be a little too much for my motor now but as I add more to it It will be worth it in the long run. @ryanw is right, I believe I read a TB comparison in MMFF a long time ago that did say that a huge TB on a relatively stock engine may lose some HP and Torque but if your going to do any more to your car the mod now saves you $$$ in the future. Also I used TB gassett to hone the opening on the intake and tapered it in towards the intake as I went. Good Luck __________________ Rust is lighter than metal......right.

March 3rd, 2011, 07:45 AM	#5
StangBanger302 Hardcore Enthusiast 1992 Mustang LX 13.0 @ 105 Join Date: Jun 2010 Location: New York Posts: 2,230 iTrader: 0 reviews	I'm just not going to give technical advice over there anymore. They're all G.I.T.P. I don't see how getting a bigger MAF and intake/TB would make you lose power??? People get bigger cylinder heads for more power, same thing in this situation... __________________ As I lay rubber down the street I pray for traction I can keep But if I spin, and begin to slide Please dear God, protect my ride

March 3rd, 2011, 04:56 PM	#8
horsepowerjunkie Hardcore Enthusiast 1989 Black LX---Turbo Join Date: Jun 2010 Location: just outside Minot, ND Posts: 1,153 iTrader: 0 reviews	I've always heard the bigger the better on the MAF & intake pipping. I beleive TB should be sized according to engine size. IMO __________________ 89 LX Black, Boss 331, C4,T76BB, FAST EFI 82 Capri RS,89 5.0 HO,Comp XE266,TW 170,T5,etc. 73 Dart Sport 340, 410ci Bracket Brawler 72 Demon 340 4-speed 1 of 1667 01 Ram Quad Cab 03 Grizzley 660 Last edited by horsepowerjunkie; March 3rd, 2011 at 05:01 PM.

March 3rd, 2011, 01:25 AM	#3
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	Those guys are idiots. The OEMs have been doing large TBs on smaller cube engines for years now. I believe the trailblazer 6cylinder engines have something like over an 80MM TB just as an example. There's a ton of examples like this that I've seen.

March 3rd, 2011, 08:32 AM	#6
Rascus Newbie Join Date: Oct 2010 Posts: 32 iTrader: 0 reviews	I think it has to do with velocity on the 5.0's. Also, if they are doing a large TB on a bone stock intake, the intake opening may be small enough to have a lip the that would create a restriction in flow. The reason it's not the same as your cylinder head example, is that the cylinder heads on the 5.0's are the cork in the airflow. Say you have a 355ml bottle and a 2L bottle of water, the 2L bottle isn't going to flow anymore water out of it because it is pouring out of the same size hole as the 355ml, even though the opening up to the hole is larger. Putting on aftermarket heads is cutting the top off the bottle.

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