Maf

[93PorterStang]

So if im running a 65mm throttle body and 30lb injectors will a 75mm MAF be sufficient? also what is the stock MAF mm? cause I think that's whats on it now.

 

[General karthief]

Your maf should match your injectors.
Post a pic of your maf

 

[cleanLX]

stock MAM is 55mm (can be bored out to 60mm), of course QA/QC could have that either way a few mm's.
I don't understand why you "need" larger MAM than TB, but seems like what most folks do.
I'm running a 76mm MAM and a 75mm TB. Seems to work ok. Always wondering what a 90mm MAM would do... if anything... ? Guess at that point I'd have to ditch the stock air box, and I'm not ready for that.

 

[Mustang5L5]

I run an SN95 75mm MAF with 65mm TB.

 

[mikestang63]

what is your engine setup

 

[93PorterStang]

E303 cam, headers, 65mm TB, 30lb injectors

 

[mikestang63]

way too much injector with stock heads and that cam. You can use stock 19# injectors.
Is your current MAF calibrated for 30# injectors or do you have a chip.
If it were my car, I would swap back in 19# injectors and a 1994-1995 stock Mustang GT 70MM MAF.

 

[Mustang5L5]

I agree. 30s are too much.

Put 19s back and swap in an 94-95 MAF

 

[93PorterStang]

Problem is I bought the car like that and it ran fine until I change the throttlebody

 

[Deleted member 215073]

Don't you have to reset your throttle position sensor and idle when changing a throttle body?

 

[Mustang5L5]

Problem is I bought the car like that and it ran fine until I change the throttlebody

What's it doing exactly?

I'd start by pulling codes and see what the ECU says. But regardless, with stock H/C/I those injectors are rather larger. I wonder if a prior owner had a supercharger on the car, and removed it prior to sale. You are also running a stock MAF with 30#ers. Does the ECU have a tune or chip to calibrate for the injector size? If not, more reason to slap some 19's on there.

 

[93PorterStang]

Well it runs like crap when its cold fuel injected im assuming it shouldn't do that and it idles at 650 when I go home today I will take a picture of the MAF. Now one thing im assuming they are the 30lbs because of the color being orange on the injectors.

 

[cleanLX]

orange is stock 19's.
30's are a red/rust looking color.

 

[Mustang5L5]

Actually. Orange is 19# injectors. 30 pound injectors are red.

 

[a91what]

Picture time...

 

[93PorterStang]

Well then I was wrong so they are the 19's Well damn back to the drawing board now

 

[93PorterStang]

MAF

 

[Mustang5L5]

looks like a stock maf to me. Run the engine codes

 

[93PorterStang]

i guess that's what im gonna have to do