I have a 1992 f150 with a 302. I'm told there is a conversion to put a mass airflow system on it. I found one from ford motor sports, but it was like $650, a little out of my price range. Any suggestions on a cheaper solution to modify the engine and still maintain streetabilty and not mess up the computer? Also any links to cheaper mass air flow conversion kits. Thank alot, this forum rocks!!

Deano

 

I like a speed density system. MAFs are relatively expensive. They get out of adjustment (dirt and oil) giving drivability problems. They fail far more often that MAP sensors. MAP sensors are a huge advantage in general troubleshooting, like always having a vacuum gauge hooked up.

That being said, a speed density system is more tied to calibrations than a MAF. If you change the intake, throttle body, cam, or exhaust the ECU/PCM calibrations won't be quite right. The MAF (except for some intake mods) doesn't care nearly as much about mods.

Basically, unless it's considerably modified, I like a speed density system better than a MAF.

 

I was told that with the speed density system it would not find an idel rpm. Can i just re-chip the computer with the mods i will put to it and run fine? thanks

 

Mass Air requires a matching computer.
You can make changes to the engine as long as it doesnot lower the intake vacuum level more than a couple inches.
Air intake -ok. Muffler/catback-ok. Some increase in cam timing-ok. Porting -ok.
The truck engine cam is short on timing and not like a car engine.
Comp Cams has a cam that will work without upsetting the intake vacuum to much.
The reason the intake vacuum level is so important is the MAP sensor determines, to a very large degree, what the fuel versus load will be. A loss of vacuum level infers more fuel as the onlty way the EEC know what the load is. Not the TPS position.
This has been worked out as a computer model in the EEC software.
You get to far way from design and the drivability/ idle goes to hell in a hurry.
The Ford kit also makes changes in the fuel injection because the truck uses Batch fire that operates the injectors in groups of 4 each at the same time and not sequencial plus adds the air mter function in place of the Map function.