24# injectors

Supaman

Founding Member

Aug 11, 1998

365

0

17

Hawaii

Jun 1, 2006

#1

• Jun 1, 2006

• #1

Could 24# injectors be used on a daily driven supercharged car?

 

E

emagdnim

Active Member

Feb 5, 2003

391

15

28

Jun 1, 2006

#2

• Jun 1, 2006

• #2

Depends on how much power you plan on pushing. What are your plans?

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

34

129

Jun 1, 2006

#3

• Jun 1, 2006

• #3

A little more info on the combo would be nice, but absolutely yes.

 

88Stang331

New Member

Mar 30, 2006

239

0

0

Jun 1, 2006

#4

• Jun 1, 2006

• #4

I would suggest 30#-36# Injectors depending on boost, and the rest of the combo.

 

bubba-dough

Active Member

Dec 28, 2004

1,044

2

38

Indiana

Jun 1, 2006

#5

• Jun 1, 2006

• #5

Yes it can but we need to know what kind of combo and power we are talkin about.

 

Supaman

Founding Member

Aug 11, 1998

365

0

17

Hawaii

Jun 2, 2006

#6

• Jun 2, 2006

• #6

I'm not looking for much boost. Just something to have when you need it and maybe for some weekend drags. Right now my engine mods are extrude honed and ported cobra upper and lower intake, edelbrock heads with 1.6 roller rockers, 24# injectors, 70mm throttle body, Pro-m mass air meter and a B-303 cam. I want to purchase a intercooled procharger P1SC in a couple of weeks.

 

88_GT_5_oh

Sportin' a turbo 5.0 in Canadistan

Jul 4, 2004

1

0

1

WPG/MB/CA

Jun 2, 2006

#7

• Jun 2, 2006

• #7

i ran 24's N/A this last year with no problems.

 

bryce93lx

Member

Jan 20, 2006

88

1

19

Luke AFB AZ

Jun 2, 2006

#8

• Jun 2, 2006

• #8

24's are good only to a little over 300 horse, with any kind of boost and the head and intake package(a honed cobra flows very well) you have mostlikly 310 or so now and the blower( even at 6 psi) should be a 30% power increase pushing you very close to 400 horse(or more) 30's are the minimum i have a wheel at home that shows the best injectors pm and i will check it for you

 

D

Daggar

New Member

Jul 19, 2004

3,902

5

0

Jun 2, 2006

#9

• Jun 2, 2006

• #9

Suck it up and buy 42s and a tune. With 24s you'll be needing an FMU to ramp up fuel pressure enough to support the boost. The trouble with doing that is whenever pressure is ramped up then the max volume of fuel the pump is able to produce is reduced.

An FMU must be tuned mechanically whereas sufficient sized fuel injectors can be tune electronically. Many tuning facilities refuse to tune an FMU and that may leave you tuning it yourself.

For that, you'll need a wide band AFR meter. A good one will cost you at least half of what a custom chip will cost. You also may discover that you'll need a helper pump in addition to your in-tank pump because you're trying to provide the necessary fuel volume at elevated pressures. Those also cost money.

Last but not least, fuel injectors become more inefficient, the higher you ramp up the fuel pressure. Atomization is not as complete at 70+ psi as it would be at 40.

In a nut shell... it's better to run properly sized injectors at near stock fuel pressures than forcing smaller ones to do the job.

One other small footnote:

24 lb injectors are usually good to about 300HP as mentioned above. That figure is for normally aspirated applications. More injector is required to make the same power in a boosted app.

Yes... it can be done with 24 lb injectors. There are certainly better ways to do it though. Having the ability to electronically control your AFR will result in an often, much better power band.

Once the custom chip is purchased, it usually only costs about $100 or so for subsequent tunes if you decide to make further modifications down the road.

 

Supaman

Founding Member

Aug 11, 1998

365

0

17

Hawaii

Jun 2, 2006

#10

• Jun 2, 2006

• #10

The only problem I have if I upgrade to larger injectors is the tuning. I live on The Big Island in Hawaii and where I live there is nobodyy that does tuning. We have two dynos on the whole island and none of them does any tuning. If I do upgrade to bigger injectors, is there any way to tune it my self with out putting it on the dyno? I really don't trust those guys.

 

D

Daggar

New Member

Jul 19, 2004

3,902

5

0

Jun 2, 2006

#11

• Jun 2, 2006

• #11

Yes... there are two options available that are pretty popluar with our cars:

1) TwEECer R/T and a wideband AFR meter.
This option can require quite a learning curve and not what you'd probably consider "user friendly". Still, if you're patient and don't mind the trial and error approach to learning to tune, it'll give the most control. You'll also need to track down the flow data sheet for your meter. You'll need to input that data into the TwEECer but will not need to have it recalibrated.

2) Anderson PMS and wide band AFR meter.
This is considerably easier to learn and operate. You don't have the same control that you would with a TwEECer and you'll need to have your meter recalibrated for 42 lbs injectors. It's also a pretty pricey unit.

Either of these options will allow you to tune for larger injectors.

 

88_GT_5_oh

Sportin' a turbo 5.0 in Canadistan

Jul 4, 2004

1

0

1

WPG/MB/CA

Jun 3, 2006

#12

• Jun 3, 2006

• #12

i am running a PMS this year with my turbo car, there is a guy in town that tunes them BUT you can go to www.stangtuning.com and do it yourself with the PMS

 

Jozey

New Member

Nov 11, 2003

127

0

0

Tucson,AZ

Jun 3, 2006

#13

• Jun 3, 2006

• #13

i run 30's n/a

 

Supaman

Founding Member

Aug 11, 1998

365

0

17

Hawaii

Jun 3, 2006

#14

• Jun 3, 2006

• #14

Thanks for all the replies. I finally made up my mind. I'm going to get 42# injectors and a anderson PMS. Can't wait to get it all together. Do I need to get a mass air meter calibrated for the PMS? I was reading about it and is said that "Now comes with global fuel adjustments, which means you can offset the mass air for different sized injectors." Thanks again

 

turbofreek

New Member

May 11, 2006

16

0

0

illinois

Jun 3, 2006

#15

• Jun 3, 2006

• #15

heres an injector chart for you for reference for boost

 

Attachments

• injectorchart.webp

  55.3 KB · Views: 194

D

Daggar

New Member

Jul 19, 2004

3,902

5

0

Jun 3, 2006

#16

• Jun 3, 2006

• #16

Yes... you need to get the meter recalibrated. The injector offset is for the injectors, not the meter transfer function.

 

vristang

15 Year Member

Mar 31, 2005

4,933

101

124

Seattle

Jun 4, 2006

#17

• Jun 4, 2006

• #17

Supaman said:

Thanks for all the replies. I finally made up my mind. I'm going to get 42# injectors and a anderson PMS. Can't wait to get it all together. Do I need to get a mass air meter calibrated for the PMS? I was reading about it and is said that "Now comes with global fuel adjustments, which means you can offset the mass air for different sized injectors." Thanks again

Click to expand...

Can you provide a link to what you were reading?

I am a tweecer user (atleast for the time being), and the PMS seems pretty different from the tweecer with regard to the MAF setting.

Maybe I misunderstood, but it sounds like the MAF has to be cal'd to the injectors. I thought all the aftermarket tuners allowed the MAF Transfer and Injector settings to be changed independantly.

Just curious,
jason

 

Supaman

Founding Member

Aug 11, 1998

365

0

17

Hawaii

Jun 7, 2006

#18

• Jun 7, 2006

• #18

Would a Kenne bell boost-a-pump work for the time being with the P1SC until I can save enough for the injectors, MAF, and PMS? My funds are low right now, I didn't know this hobby could be so expensive. Thanks again for all the replies!!

 

Supaman

Founding Member

Aug 11, 1998

365

0

17

Hawaii

Jun 8, 2006

#19

• Jun 8, 2006

• #19

TTT