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02-15-2004, 03:20 AM | #1 |
Registered Member
Join Date: Nov 2003
Location: Ontario, Canada
Posts: 17
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performance & mileage
I'm was looking at picking up some heads, roller rockers and an intake and all at once give my car a nice upgrade in power. However, this is my daily driver and I frequently have to drive pretty far. My concern is how badly different upgrades are going to hurt my fuel economy. I realize some mods are gas guzzlers (e.g. steep rear end) but a friend of mine suggested intake stuff may actually leave fuel economy almost stock. I'm open to other ideas of course as well. So my question is what performance upgrades can I do that leave fuel mileage alone - or, better yet - increase it?
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02-15-2004, 11:15 PM | #2 |
Registered Member
Join Date: Apr 1999
Location: St.Louis,MO
Posts: 274
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It is not unusual for an 89-93 5.0 to get 25+ MPH on the freeway. City driving is always going to be poor.
My car was at one time a 25+ car. It was before I bought it but it was a good performer. I know it had a 70mm TB, 1.7 rockers, Flowmaster cat-back, and gt-40 heads and intake. The stock cam was retained. Now I can't be sure the heads and intake made the high mileage combo but the stock cam is the largest helper. Note that the gt-40 heads are not that aggressive. They have smaller valves and ports (than a standard performance head) and are good for mild power and good economy. The intake valves are 1.84" compared to 2.02" for the standard trickflow/afr/edelbrock etc. Since you want a daily driver, you are correct the gears would not help much. You could leave off the 1.7 rockers and get more economy and extend valvetrain life. Mike
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02-16-2004, 05:29 PM | #3 |
Mizzou Tigers
Join Date: Apr 1999
Location: weston, MO United States
Posts: 1,455
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My car was a 25+ car also with the GT-40 heads and intake, B-cam, and other bolts ons. However, it has dropped off recently and I can't figure out why . I don't think my engine is getting tired or anything. I may have a bad sensor or something.
You can get pretty good mileage even with some add-ons to your car, although as stated before, city driving seems to always be poor.
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2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244 |
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