What size injectors are enough?

Q

quikrnu

New Member

Mar 11, 2002

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Canada

Sep 7, 2006

#1

• Sep 7, 2006

• #1

I have an 89 with a 306, TFS T/W heads (mild porting), TFS Street heat intake, F303 cam, 1.6 roller rockers, 24# injectors and a 190lph intank pump. Are these injectors big enough for my combo or would 30's be better. I have an oppurtunity to purchase 30# and an air adjuster to change the calibration of the Pro-M mass air meter. Would this be a benefit or a waste of time & money.
Anyone used/using one of these 'air adjusters'? Do they really work?

Thanks for any helpful insight.

 

R

r.barn5.0

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May 21, 2006

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Sep 7, 2006

#2

• Sep 7, 2006

• #2

24's are more than enough.

could probably squeeze by with 19's, with your combo

19's are good for abour 300rwhp
and 24's up to about 325-350.

you will probably make in the 275-280rwhp range


only way to correctly recalibrate an MAF is to have a custom dyno tune and SCT chip.

 

T

Topdowncruise

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Apr 7, 2005

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Sep 9, 2006

#3

• Sep 9, 2006

• #3

I agree.Don't put them on your car even if they are free.They would be no benefit and hurt driveability somewhat.

 

7

71swing

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Aug 18, 2006

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Omaha,NE

Sep 9, 2006

#4

• Sep 9, 2006

• #4

Could always buy for the future.

We all know the speed bug gets us. You may not be making the power for the 30#s now, but willing to bet you will need them someday.

If you can get a deal on them now, why not buy them and store them away for that day you get your poweradder?

 

T

TheUser

Active Member

Jul 25, 2003

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Springfield, MO

Sep 9, 2006

#5

• Sep 9, 2006

• #5

r.barn5.0 said:

24's are more than enough.

could probably squeeze by with 19's, with your combo

19's are good for abour 300rwhp
and 24's up to about 325-350.
.

Click to expand...

I think those figures are good for flywheel hp, not rear wheel. I crunched some numbers and, assuming I'm correct, 19 lb injectors are good until about 255-260 flywheel hp, and 24's are good until about 320 flywheel hp.

By your figures, 19 lb injectors are good until about 350 flywheel hp (rear wheel + drivetrain loss of 15% = 345 flywheel hp). That's kinda hard to believe. There are a few calcs on the net to do this, but I couldn't find them, so I searched stangnet and some guy was doing the formulas, so I plugged the formulas into excel and out came those numbers.


Maybe sqeeze by w/ the 19's, but 24's would be better in my opinion.

 

sweet03cobra

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Dec 27, 2004

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Anchorage, Alaska

Sep 25, 2006

#6

• Sep 25, 2006

• #6

yeah there must be a reason ford put 24lb ones in the cobras with only 20 more hp.

 

millhouse

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May 14, 2002

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Simpsonville, SC

Sep 25, 2006

#7

• Sep 25, 2006

• #7

http://www.megamanual.com/v22manual/minj.htm#size

 

$uperstang

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Jul 20, 2004

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Detroit, MI

Sep 25, 2006

#8

• Sep 25, 2006

• #8

24's are plenty 30's would be way too much for you.

 

deadlast

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Mar 30, 2005

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Belmont, MA

Oct 7, 2006

#9

• Oct 7, 2006

• #9

would 24's be sufficient if nitrous was added?