Just a quick question is anyone having trouble with their engines running quite rich... ive got excessive build up on my exhaust tips... just wonderin if its normal...

 

yeah, this is normal.

hence why Tunes are getting so much HP/trq improvements. the inside of my bassani tips are BLACK.

 

Not sure if I'd like the inside to be black so it always looks dirty. I wipe the inside of my Magnaflow tips down every evening and they are always nice and shiny for the next morning. It only takes a few seconds.

 

Ian, you had some beers tonight didn't you??? You weren't driving were you? I saw where you posted something about you drinking too much and the wife driving you home.....that's how I got home tonight also. Enjoy.

 

Why do these engines run rich?

 

Good question - probably mostly so Ford can make sure they will run on 87 octane. I wonder why they feel the need to run on 87 to begin with - I can't think of another "sports"-type car that doesn't require 91.

Bottom line is I guess it's good for the aftermarket - with a computer tune you can get 15-20 HP out of the box, not bad if you ask me.

 

Regarding comment on "sports" cars that are running on high octane fuel.
I considered and drove the G35 coupe, the 330Ci BMW, the Acura TL, and a few other sporty imports. All of them REQUIRED premium fuel. However, they all used small displacement engines with compression ratios in excess of 10.5:1. The higher octane fuel was required due to the higher compression ratios and the tune used to achieve the hp output. The Mustang can achieve 300 hp on 87 octane due to it's larger displacement and dispite it's low compresion ratio. The nice thing is that while the imports are maxed out on hp without turbo or sc add-ons, the Mustang can be modded and retuned for additional hp using premium fuels. With the Mustang you get a choice, with the imporrts you must use premium.

John

 

Good point John.

 

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