Engine Difference Between Maf For Stock Airbox Vs Fenderwell Cai

JasinC19

What hole is this!?!

Jun 7, 2011

312

2

19

May 31, 2013

#1

• May 31, 2013

• #1

I was wondering what the real difference between a MAF for the stock airbox vs a fenderwell CAI is.

Example is PRO-M's units. Why is one better suited for a CAI?

Also, is anyone running a 75mm PRO-M for 24# injectors with a BBK CAI?
Product Here

Thanks
J

 

Bill Gordon

Active Member

Sep 20, 2012

119

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29

Broomfield, CO

Jun 1, 2013

#2

• Jun 1, 2013

• #2

I am running a Pro M 75mm MAF calibrated for 42# injectors and CAI. The CAI is a BBK. The setup runs awesome with the blower. After talking to Pro M, they said the CAI tuned MAF is calibrated for the 90* elbow in the CAI, the elbow creates turbulence in the airflow, which can upset a non CAI calibrated MAF. The stock airbox is a plenum which allows the airflow to settle out before it hits the MAF. Hope this helps.

 

JasinC19

What hole is this!?!

Jun 7, 2011

312

2

19

Jun 1, 2013

#3

• Jun 1, 2013

• #3

Thanks Bill. I talked to c&l and they claim that the maf I have is correct and fine for stock box and bbk cai and that it takes just 6 inches of straight pipe before maf to straighten out the air flow. Not sure how true that is... Or if the bbk even qualifies.

I'll probably break down and switch to pro m eventually to eliminate another possibility...

Bill Gordon said:

I am running a Pro M 75mm MAF calibrated for 42# injectors and CAI. The CAI is a BBK. The setup runs awesome with the blower. After talking to Pro M, they said the CAI tuned MAF is calibrated for the 90* elbow in the CAI, the elbow creates turbulence in the airflow, which can upset a non CAI calibrated MAF. The stock airbox is a plenum which allows the airflow to settle out before it hits the MAF. Hope this helps.

Click to expand...

 

Rick 91GT

Mustang Master

Nov 29, 1999

9,692

95

99

PA

Jun 2, 2013

#4

• Jun 2, 2013

• #4

JasinC19 said:

Thanks Bill. I talked to c&l and they claim that the maf I have is correct and fine for stock box and bbk cai and that it takes just 6 inches of straight pipe before maf to straighten out the air flow. Not sure how true that is... Or if the bbk even qualifies.

I'll probably break down and switch to pro m eventually to eliminate another possibility...

Click to expand...

Correct.... Lee @ C&L is a smart guy

Sent from my XT907 using Tapatalk 2

 

JasinC19

What hole is this!?!

Jun 7, 2011

312

2

19

Jun 11, 2013

#5

• Jun 11, 2013

• #5

Update: I got the Pro-M MAF installed. I could be wrong, but it definitely seemed to help a bit. Still pretty rough.

Tonight I took the upper intake off, rerouted the PCV hose from the side of the intake back to underneath the manifold.

Then I retorqued the lower intake bolts 5 or 6 times. They were't loose per se, but they were defintely out of spec.

I turned the key and.......

It drives a lot better!

I ripped it around my neighborhood dodging small children, pets, and geriatrics and it is actually quite driveable!

I don't want to jinx myself but I think I solved a lot of my issue tonight!

Thanks for everyone's help. Once I get it straightened out and inspected I'll take a video and post it so you guys can check her out.

Jason

 

Rick 91GT

Mustang Master

Nov 29, 1999

9,692

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Jun 11, 2013

#6

• Jun 11, 2013

• #6

Based on that video you sent... I am 99% sure you had a vac leak

Sent from my XT907 using Tapatalk 2

 

JasinC19

What hole is this!?!

Jun 7, 2011

312

2

19

Jun 11, 2013

#7

• Jun 11, 2013

• #7

Rick 91GT said:

Based on that video you sent... I am 99% sure you had a vac leak

Sent from my XT907 using Tapatalk 2

Click to expand...

Hmm well there were a few vac line nipples capped off with some caps that were dried up that I replaced. That could've been something...

If the lower intake were loose, could that have been sucking air?

 

Rick 91GT

Mustang Master

Nov 29, 1999

9,692

95

99

PA

Jun 11, 2013

#8

• Jun 11, 2013

• #8

Yup....I also like to nylon wire tie those caps and all vac lines

Sent from my XT907 using Tapatalk 2

 

306N/A

Member

May 1, 2013

95

2

9

Ontario

Jun 11, 2013

#9

• Jun 11, 2013

• #9

I am running a 75 mm bbk maf 24lb with a bbk cai ran like for a few hours, but corrected itself now runs flawless

 

7991LXnSHO

wanna catch the space herp

10 Year Member

Sep 1, 2010

7,387

2,745

194

Kearney, NE

Jun 13, 2013

#10

• Jun 13, 2013

• #10

Rick 91GT said:

Based on that video you sent... I am 99% sure you had a vac leak

Sent from my XT907 using Tapatalk 2

Click to expand...

Hate it when that happens. EFI is picky about that. Glad you are up and running.

 

306N/A

Member

May 1, 2013

95

2

9

Ontario

Jun 19, 2013

#11

• Jun 19, 2013

• #11

Now it runs like garbage again??? computer not remembering the new fuel air curve ???