The truth behind throttle body and plenums... with dyno charts - Ford Mustang Forum
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post #1 of 76 (permalink) Old 04-01-2010 Thread Starter
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The truth behind throttle body and plenums... with dyno charts

It seems like a common question in 4.6l 2v world, is what throttle body or plenum will yield the most horse power. This thread is aimed more for naturaly aspirated bolt on cars, but I will include dyno sheets for forced induction applications as well.

The common question (especialy by individuals just begining to mod their cars) is how big of a throttle body do i need, and what company makes the best throttle bodies and plenums, and what are the best combos.

Forced Induction applications will react more to upgraded throttle body and plenums, but naturaly aspirated applications will react as high to simple mods such as this.

I am going to start right away by saying that C&L plenums combined with a 75mm throttle body, make the best results on a naturaly aspirated bolt on gt.

car 1

2002 gt

C&L plenum and 75mm BBK throttle body were added

the car already had the following........
C&L 85mm Mass Airflow System with C&L inlet pipe
Under-drive pullies
Timing adjuster set to 12 degrees
Off-road X-pipe with Mil Eliminators
Magnaflow 2 1/2" cat-back exhaust

before plenum and throttle body- 263.5 horse power and 301.38 torque

After plenum and throttle body- 277.5 horse power and 318 torque

That is a 14 horse power gain and a 17 ft lb of torque gain

link to dyno sheets

C&L Intake Plenum For 2V 4.6L Mustangs

Back up pulls were done and a pull was done with a 70mm throttle body which resulted in a 3 horse power loss.

car 2

2003 gt

K&N Cone Filter
Under-drive pullies
Timing adjuster at 12 Degrees
Mac Pro-Chamber H-pipe

Baseline- 257.2 HP and 298.2 ft/lb of torque

with C&L plenum and 7mm tb- 266 HP and 307 ft/lb of torque
gain of 8.8 HP and 8 ft/lbs of torque

again a 70mm tb was swapped on and a 3 horse power loss was seen

link

C&L Intake Plenum For 2V 4.6L Mustangs

supercharged application car 3
2000 gt

10# P1sc S/C kit with a 3 core intercooler
42# injectors
Euro Focus pump (returnless friendly and flows 260+ lph)
Lightning 90mm MAF
Bassani cat-back


Air/Fuel Ratio graph from the dyno testing of Dan Hourigan's Supercharged Mustang GT
MAC off road H-pipe
Custom tuned Autologic chip

C&L plenum+ 75mm bbk tb gained 15- 20 horse power

link

http://www.cnlperformance.com/plenum07.html

car 4

NON PI 1997 automatic gt

Gains ranged anywhere from 7-10 rear wheel horsepower, depending on engine RPM.
Torque was improved by as much as 10-15 Ft/Lbs in the low to mid RPM's, with an average improvement of around 5 ft/lbs throughout the upper RPM's.

link

http://www.cnlperformance.com/plenum09.html

MOdular DEpot did a show down between trickflow, accufab, dragon, and C&L

StockAccufabC&LDragonTrick Flow
RWHP265.97272.38 (+6.31)271.13 (+5.16)270.69 (+4.72)270.19 (+4.22)
RWTQ303.54310.42 (+6.88)306.05 (+2.51)307.27 (+3.73)306.61 (+3.07)

these were done with a accufab 75mm throttle body

modular stated that they would have crowned accufab winner but the results vary from car to car that it could change. I reality all plenums were fairly close.

link

The Plenum Showdown Part II






I hope this thread has helped provide some good info, and crush the theory that a 75mm is to much for a bolt on gt.

This research makes me feel better about my decision to spend money on a C&L plenum with accufab 75mm throttle body.


1990 mustang gt 5.0l, red, aod- its build time

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post #2 of 76 (permalink) Old 04-01-2010
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this is a great thread. good job shorties. we should get someone to sticky this AND leave it in this forum

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post #3 of 76 (permalink) Old 04-01-2010
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would be interested to see how the 03-04 mach 1s react, though i dont think it will make as drastic of a change as it does on GTs. i recall hearing somewhere that the GTs were more starved for air than the Machs.
None the less, would be interesting to see

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post #4 of 76 (permalink) Old 04-02-2010
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Nice write up. I read that article a while back trying to decide what I wanted to do with the car.

I've lately been contemplating getting an automatic Mach 1 and making a full N/A street/strip BEAST. I really love the New Edge's, and I think that would be a fun project.

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post #5 of 76 (permalink) Old 04-02-2010 Thread Starter
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thanks everyone

I was hoping to create a thread that will answer alot of questions about throttle bodies and plenums on 2v gts.

It seems like their is always someone asking wat plenum or throttle body to buy, and this thread I hope will help answer questions.

I went with a C&L plenum and 75mm accufab throttle boy, because C&L plenum results with a 75mm throtttle body are consistent and easy to find. And C&L is not afraid to post research and dyno tests on their website.

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post #6 of 76 (permalink) Old 04-02-2010 Thread Starter
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Quote:
Originally Posted by dardenus View Post
would be interested to see how the 03-04 mach 1s react, though i dont think it will make as drastic of a change as it does on GTs. i recall hearing somewhere that the GTs were more starved for air than the Machs.
None the less, would be interesting to see
yes it would be interesting to see what throttle bodies do on mach 1s, especialy the accufabe peice.

The stock intake setup on a gt is limiting, and upgrading does prove fruitful especialy when all three peices are upgraded, plenum cai and tb

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post #7 of 76 (permalink) Old 04-02-2010 Thread Starter
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Quote:
Originally Posted by 04sonicbluegt View Post
Nice write up. I read that article a while back trying to decide what I wanted to do with the car.

I've lately been contemplating getting an automatic Mach 1 and making a full N/A street/strip BEAST. I really love the New Edge's, and I think that would be a fun project.

the money you would spend on a mach 1 you could put into your gt instead and make it a beast

The research i did while writing this thread helped me gain a deeper understanding of the bolton 2v gt.

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Quote:
Originally Posted by ****.breakey View Post
this is a great thread. good job shorties. we should get someone to sticky this AND leave it in this forum

Itwould help answer questions people ust getting into modding have to

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post #9 of 76 (permalink) Old 04-02-2010 Thread Starter
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What throttle body and plenum setup does everyone have and what kind of results did you see? was it good quality? was it worth the $?

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Thanks for this bro lol I get sick and tired of hearing people saying that a 75mm throttle body hurts performance and that a 70mm throttle body is actually better lol. I am running a C&L Plenum with a 75mm trickflow throttle body and couldnt be happier!

More Air = More Power!

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typically you probably could build a gt rather than buy a mach, but my situation was a bit unique. found a 'dealership' if you want to call it that out in the middle of nowhere that had no idea what they had on their hands, spend 13.8k at 28000 miles

still a bit curious if its worth spending the money on tb on the machs tho, or if im better off saving for something else.

Torch Red 03 Mach 1

Steeda CAI
Steeda Underdrive Pullies
Steeda 3 point strut tower brace
JBA Cat back
MGW Short throw shifter
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post #12 of 76 (permalink) Old 04-02-2010 Thread Starter
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Quote:
Originally Posted by dardenus View Post
typically you probably could build a gt rather than buy a mach, but my situation was a bit unique. found a 'dealership' if you want to call it that out in the middle of nowhere that had no idea what they had on their hands, spend 13.8k at 28000 miles

still a bit curious if its worth spending the money on tb on the machs tho, or if im better off saving for something else.

I was unable to find dyno results for just the throttle body, but you should bbuy it and post results here

this thread would make a nice sticky

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post #13 of 76 (permalink) Old 04-02-2010 Thread Starter
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I have not been able to find dyno test results on the professional products plenum, so if anyone has some numbers or review of the piece feel free to post.

I installed a pp plenum for a friend not to long ago and I was unimpressed by the quality. I was surprised by the number of imperfections , but it could have just been a lemon.

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C&L & Accufab 75mm here. Still waiting on the tb to come in though. Will have some dyno numbers within the next 2 months

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Quote:
Originally Posted by B3ATNGU View Post
C&L & Accufab 75mm here. Still waiting on the tb to come in though. Will have some dyno numbers within the next 2 months

Awesome can we get some pics of the plenum posted? i would post some of mine but I am waiting on them to.

What made you decide to go with C&L and Accufab?


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