- Jun 3, 2013
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OK so I have a edelbrock 70mm TBI and I also have the ford air flow sensor I guess for a 55mm TBI? Part # f1zf-12b579-aa. Under that its #afh-03b. Should I buy a air flow that is rated 70mm I'm guessing?
OK so I have a edelbrock 70mm TBI and I also have the ford air flow sensor I guess for a 55mm TBI? Part # f1zf-12b579-aa. Under that its #afh-03b. Should I buy a air flow that is rated 70mm I'm guessing?
Yes, my BBK TB whistling lets me know when the IAC is working. It just does it at idle, and I read I can cure it by rounding the sharp edges in the TB passages. I wish someone would post A pic showing exactly what to polish/ grind.justinb248ost: 8735116 said:Yeah that's what I was looking at then I seen the cobras have them. Your tb whistles? I don't think mine does
Wrong answer...All the BBK 70 mm TB I have seen whistle, including the one on my car. MAF's are calibrated to the injector size so you don't use a cobra MAF unless you have 24lbers. You can get a tune to have Cobra MAF work with other size injectors if you want but it is much easier if you have the stock 19lbers, you want a stock 94-95 GT70MM MAF for about $40 from any junkyard
Wrong answer...
Ford OEM MAFs are calibrated to match the computer's internal program. The program uses the MAF data to set injector on time, which sets the air/fuel ratio.
Aftermarket MAFs have no way of modifying the computer's internal program, so they "lie" to the computer by changing the amount of output voltage for the amount of air they are passing. It's a sloppy method for determining a precise problem. That's why a custom dyno tune and a chip burned using the dyno data is the ultimate answer to large MAFs and/or large injectors.
As a general rule, you want the air passage to either be the same size or get smaller all the way from the air filter to the intake valve - going small to large at any point actually makes flow worse.