quote:Originally posted by DeTom:
"On radical engines (those with cam duration over 240 degrees at 0.050 or less than 10 inches of idle vacuum), even user-programmable Speed Density systems have difficulty due to an erratic or insufficient manifold vacuum signal."
This issue is totally independent of IR.
quote:I guess the real answer is that they haven't made a good system for IR yet.
How did you conclude this DeTom? It certainly wasn't from the article the first quote was lifted from.
MAF is adaptable but it's also not a cure all. If you read the article closely you will note that it touts the ability of MAF to adapt to changes you make to the engine.
The issues cited with MAP signal does not mean you can not effectively tune speed density systems for a fixed engine configuration. The blend modes do offer a lot of flexibility.
I guarentee that MAF is not a bolt on solution for high states of street tune and custom engine configurations.
If all you want is for your car to idle well, transition well, and want adaptability because you plan on making changes within a more modest range of tune, MAF is a fine. I still predict it will not be a bolt-on selfconfiguring system for your 351c without some significant effort. The closest route would be to buy a 5.4l Windsor MAF system and mod the intake, or mod a single plan intake for FI, and p[iece together all the rest. Cheaper than IR? Yup. Performance comes at a price and takes time. -To each his own.