why do stangs need such big injectors?

S

Saleen4971

New Member

Mar 26, 2003

664

0

0

Setauket, LI

Jan 16, 2007

#1

• Jan 16, 2007

• #1

for a stock 4.6 or 5.0, they coem with 19's. and they use mass air, which reads the actual air going on.

on my jeep which is speed density, came with 23.7's on a 5.9 liter with 245hp/345tq stock. i put on full exhaust, FIPK, TB, heads, cam, intake manifold, and a mopar performance computer. went fomr a stock 14.8-15.2 quarter mile, i was running 13.5's with the stock fuel system form the tank to teh injectors.


why is it that with a 5.0 or a 4.6, once you do major mods you need bigger injectors, but i tore into my 5.9 liek nobodys business and didnt have to?

 

hotmustang331

Active Member

Apr 29, 2004

2,967

3

48

Bastrop,TX

Jan 16, 2007

#2

• Jan 16, 2007

• #2

I run the stock injectors. Its when you add boost that you have the problem....the high pressure in the intake manifold means that its harder to spray the fuel out of the injectors vs with an N/A car thats pulling air in and helping slightly to draw the fuel from the injector due to the low pressure created.

The stock GT fuel system will support around 320RWHP N/A I believe. probably about what your jeep had.

 

T

turbogt

Member

May 1, 2003

723

16

19

Montana

Jan 17, 2007

#3

• Jan 17, 2007

• #3

They make a dah hawsepower..

 

geoffsgt

Member

Aug 7, 2005

176

1

16

Baton Rouge, LA

Jan 17, 2007

#4

• Jan 17, 2007

• #4

N/A modders generally upgrade from 19 to like... 21... don't they? When they get in the 300ish horsies.

Boost the jeep and it won't like the 23's anymore

 

T

timlagallow

New Member

Jan 14, 2007

7

0

0

Northern California

Jan 17, 2007

#5

• Jan 17, 2007

• #5

You also have to look at duty cyle. A duty cycle of 80% will loose its consistency over time.
So you can support a certain hp with 19lb @100%DC but it is benificial and more reliable to upgrade injector size and keep your DC down and get your comp tuned for it.

 

sgarlic

Founding Member

Apr 21, 2001

3,085

1

56

Jan 17, 2007

#6

• Jan 17, 2007

• #6

There's nothing you mentioned in your Jeep mods that would require more fuel than stock injectors can move. That's why you don't need bigger ones. As said above, you hear Mustang guys talking about upgrading because they are running superchargers or turbo's. The N/A guys don't usually need to upgrade.

 

AvalancheSVT

10 Year Member

Jun 12, 2005

573

37

49

Jan 17, 2007

#7

• Jan 17, 2007

• #7

big? hell man i got 50lb injectors in my 240 and those really are about average lol

big is like 1600CC and what not

 

DBMSTNG

I fantasize about it being BIG!

Founding Member

Apr 23, 2002

2,120

0

56

not quite here

Jan 17, 2007

#8

• Jan 17, 2007

• #8

Saleen4971 said:

for a stock 4.6 or 5.0, they coem with 19's. and they use mass air, which reads the actual air going on.

on my jeep which is speed density, came with 23.7's on a 5.9 liter with 245hp/345tq stock. i put on full exhaust, FIPK, TB, heads, cam, intake manifold, and a mopar performance computer. went fomr a stock 14.8-15.2 quarter mile, i was running 13.5's with the stock fuel system form the tank to teh injectors.


why is it that with a 5.0 or a 4.6, once you do major mods you need bigger injectors, but i tore into my 5.9 liek nobodys business and didnt have to?

Click to expand...

stock, your 5.9L was pathetic. you should be asking why they put such large injectors on your jeep.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,179

17,882

224

Massachusetts

Jan 17, 2007

#9

• Jan 17, 2007

• #9

2003+ GT's come with pink 21# injectors

 

hotmustang331

Active Member

Apr 29, 2004

2,967

3

48

Bastrop,TX

Jan 17, 2007

#10

• Jan 17, 2007

• #10

Oh man, here we go again. LOL. I cant remeber what the answer was for sure...but i THINK according to Randy, all GTs came with 19# injectors. They just switched colours. Darn, now im going to have to go ask him LOL.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,179

17,882

224

Massachusetts

Jan 17, 2007

#11

• Jan 17, 2007

• #11

hotmustang331 said:

Oh man, here we go again. LOL. I cant remeber what the answer was for sure...but i THINK according to Randy, all GTs came with 19# injectors. They just switched colours. Darn, now im going to have to go ask him LOL.

Click to expand...

 

hotmustang331

Active Member

Apr 29, 2004

2,967

3

48

Bastrop,TX

Jan 17, 2007

#12

• Jan 17, 2007

• #12

Ill look more someother time...but this is what kenB @ MD said

"I just checked the EEC calibration for a 00 and an 03 and they both are setup for 19# injectors"

Usually the 99-mid01s had the orange and the mid 01-04 had pink.

Some other guy named "SCT GUY" (an authorized vendor...apparently from SCT) said that ALL GTs have 19# injectors. Any mustang tuner would also know for certain.
Its a very hard answer to dig up, everyone is back and forth.