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Engine 1996 Cobra Mass Air Meter for 24# Injectors In a Fox 5.0

  • Thread starter Thread starter Mr. Snrub
  • Start date Start date Feb 17, 2013

Mr. Snrub

Active Member
Jan 24, 2012
153
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uh... someplace far away. (Yes, that'll do.)
Feb 17, 2013
#1
  • Feb 17, 2013
  • #1
I put 24# injectors in my fox since it was running too lean on the 19#'s... Will a 96 Cobra mass air meter for 24#ers work with the fox efi or no? Anyone done this? I searched and nothing.. So I assume it's no. It plugs in
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,265
17,952
224
Massachusetts
Feb 17, 2013
#2
  • Feb 17, 2013
  • #2
No.

MAFs ate not calibrated for specific injectors. That's just an aftermarket MAF trick to avoid retuning.

You can use that meter but it will require a custom tune to get it to function correctly.




Sent from my iPhone 4S using Tapatalk
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
34
129
Feb 17, 2013
#3
  • Feb 17, 2013
  • #3
You could try to look at the transfer curves and see how much they differ.
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
43,181
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Box behind Walmart
Feb 17, 2013
#4
  • Feb 17, 2013
  • #4
Mr. Snrub said:
I put 24# injectors in my fox since it was running too lean on the 19#'s... Will a 96 Cobra mass air meter for 24#ers work with the fox efi or no? Anyone done this? I searched and nothing.. So I assume it's no. It plugs in
Click to expand...

How lean? What is the AFR? N/A car? What are the mods? What fuel are you running? E-10/20, or straight gas? Are you getting any codes for O2 sensors? Are you getting any codes at all? Have you pulled codes? What's your fuel pressure vac off?

Stuffing 24lb injectors into a car with working O2 system and commanded AFR doesn't accomplish anything. The EEC will continue to lean out the fuel mixture (shorten injector pulse) to its limits or until it reads what it thinks is the correct AFR.
 

Mr. Snrub

Active Member
Jan 24, 2012
153
50
39
uh... someplace far away. (Yes, that'll do.)
Feb 18, 2013
#5
  • Feb 18, 2013
  • #5
Put my new 306 in the car, ecam, edelbrock performers, 1.6rrs and gt40 tubular intake. The 19's weren't cutting it.. Put the 24's in and all that was laying around was that meter.. gotta find a proper one because you guys were right.. it didn't work. lol

thanks for the help!
 

stykthyn

I want to measure mine. It doesn't look that tall.
15 Year Member
Jul 6, 2006
5,232
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gainesville
Feb 18, 2013
#6
  • Feb 18, 2013
  • #6
what heads are you running b/c thats a sub 300hp combo. no reason you should need the 24lb injectors. How were the 19lb injectors not cutting it? Not saying they didnt work but you may have another issue altogther. I have run that same intake with ported gt40s, a tfs1 camshaft, and 19lb injectors and it ran great. I dont have a dyno tune to show the fuel curve but there was no leaning at WOT or pinging to hint at a fuel issue.
 

Mr. Snrub

Active Member
Jan 24, 2012
153
50
39
uh... someplace far away. (Yes, that'll do.)
Feb 18, 2013
#7
  • Feb 18, 2013
  • #7
Edelbrock Performer 5.0 heads- 2.02" intake and 1.60" stainless valves

Lean pop between 1000-3000rpm...
24's on there and that problem was gone.... it ran with that cobra maf, but would stall on decel.
 

vristang

15 Year Member
Mar 31, 2005
4,933
101
124
Seattle
Feb 19, 2013
#8
  • Feb 19, 2013
  • #8
Either buy a calibrated MAF meter...
or buy a quarterhorse and tune for the meter you have.
 
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