gas mileage question
05-02-2011, 02:46 PM
#1
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Year: 1996
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Engine: 5.2 V8
gas mileage question
after a new cataletic convertor, 2 new O2 sensors, new glass pack muffler, oil change, tranny fluid and filter change, fuel filter, and seafoam, what kinda fuel mileage should a 1996 Grand Cherokee Limited with the 5.2/V8 get on highway miles. I know not to expect great fuel mileage but with all that done I should improve some. Before all that I was getting 15 city and around 21 highway MPG. Help me figure out what to expect on my trip to Oklahoma in the morning. I will be setting the cruise control at 70mph and let her glide down the road. And by the way her name is "SARAH" 
05-02-2011, 03:44 PM
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Year: 1993
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If Sarah will put out 21 mpg, you need to shut up and thank your lucky stars!
Just for future note, the glass pack may actually cause you less mpg.
Ron
Just for future note, the glass pack may actually cause you less mpg.
Ron
Last edited by jronald; 05-03-2011 at 04:21 PM.
05-02-2011, 04:01 PM
#3
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I went from Greenville, SC to Charlotte, NC and back on half a tank. around 220 miles on 10 gallons of fuel, that was before all the work was done to her
05-02-2011, 05:42 PM
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more on Sarah
new air filter and pcv filter..was told that helps the emissions which in turns helps a lil on fuel mileage...true?
05-02-2011, 06:31 PM
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a new cat converter usually decreases gas mileage cause theres more "filtering" stuff there, whereas the old one was burned out.
05-02-2011, 07:45 PM
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Year: 2004
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21 MPG is as good as I ever got in my '97 w/the 5.2 V8. I doubt you'll improve on that very much, if any.
BTW mine got better mileage without using the cruise control.
BTW mine got better mileage without using the cruise control.
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05-02-2011, 10:15 PM
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really? my friends truck had that happen to him, and we took it to the mechanic who said yea it'll do that for a bit till its broken in...... hmm...... 
05-02-2011, 11:54 PM
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Year: 1995
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Engine: 4.0 with all of the noise and clatter
Take a brand new cat convertor and an old used up cat convertor and look through them. You can see daylight through the new cat and the old cat will have melted substrait and have partcial clogs in most cases. The cat convertor does not filter the exhaust like a filter on a Marlboro, It uses a chemical reaction to clear hydrocarbons from the exhaust.
Now the diesel particulate filters that are in the exhaust systems of the new 2008 and newer diesel trucks do act like a filter on a Virginia Slim. That is why they have to turbo the hell out of the new diesels just to make up for the power that is robbed by the restrictive DPF systems.
Now the diesel particulate filters that are in the exhaust systems of the new 2008 and newer diesel trucks do act like a filter on a Virginia Slim. That is why they have to turbo the hell out of the new diesels just to make up for the power that is robbed by the restrictive DPF systems.
05-03-2011, 01:26 PM
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Year: 1994
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Take a brand new cat convertor and an old used up cat convertor and look through them. You can see daylight through the new cat and the old cat will have melted substrait and have partcial clogs in most cases. The cat convertor does not filter the exhaust like a filter on a Marlboro, It uses a chemical reaction to clear hydrocarbons from the exhaust.
Now the diesel particulate filters that are in the exhaust systems of the new 2008 and newer diesel trucks do act like a filter on a Virginia Slim. That is why they have to turbo the hell out of the new diesels just to make up for the power that is robbed by the restrictive DPF systems.
Now the diesel particulate filters that are in the exhaust systems of the new 2008 and newer diesel trucks do act like a filter on a Virginia Slim. That is why they have to turbo the hell out of the new diesels just to make up for the power that is robbed by the restrictive DPF systems.
05-03-2011, 08:41 PM
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Year: 1995
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Engine: 4.0 with all of the noise and clatter
Thank you, but there are guys on this forum that have forgotten more than I will ever know.
05-03-2011, 09:22 PM
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Year: 1993
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Hey, I was considering putting a glass pack on my '93 GC Limited 5.2. Not for better MPG, but for a nicer sound (and I thought it might improve flow). Why, in your opinion, do you think it might hurt MPG?
05-04-2011, 11:08 AM
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Year: 1993
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Engine: 5.2 V8, Dual cold air, dual batts, E-fan, Sanden OBA
Originally Posted by Bustedback
Thank you, but there are guys on this forum that have forgotten more than I will ever know.
05-04-2011, 05:05 PM
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Most glass packs use a gang saw to chop a 1000 small "exits" in the inside portion of the pipe. Because these exits, hang into the "flow" of the exhaust. At the best, they impede the flow, at the worst they stop the flow. Im not looking for a debate, go to your auto parts store and open a box, look down the bore you will see exactly what Im trying to explain.
If you are looking for an extremely free flowing exhaust, decent sounding muffler that is NOT loud, pick up a muffler from a Turbo Charged Corvair. Its 2.5 in and out, its very small and cheap to boot.
The absolutely sweetest sounding exhaust is a Small Block, running duals with a crossover pipe between the duals, just behind the transmission. This will also ad from 5 to 25 extra horses, very low on the power band!
Ron
Quote:
I think the confusion here is due to the fact that the original "turbo" mufflers were production Corvair items. Years ago, there wasn't much, if any, selection of high performance mufflers. You had a choice of running stock mufflers or straight-through glass packs. Then someone realized that the turbocharged Corvairs had a fairly low-restriction muffler that was relatively quiet and had good flow. Hence, everyone was going to the auto parts stores and asking for Corvair Turbo mufflers. Now everyone and their brother in manufacturing "turbo" mufflers.
If you are looking for an extremely free flowing exhaust, decent sounding muffler that is NOT loud, pick up a muffler from a Turbo Charged Corvair. Its 2.5 in and out, its very small and cheap to boot.
The absolutely sweetest sounding exhaust is a Small Block, running duals with a crossover pipe between the duals, just behind the transmission. This will also ad from 5 to 25 extra horses, very low on the power band!
Ron
Quote:
I think the confusion here is due to the fact that the original "turbo" mufflers were production Corvair items. Years ago, there wasn't much, if any, selection of high performance mufflers. You had a choice of running stock mufflers or straight-through glass packs. Then someone realized that the turbocharged Corvairs had a fairly low-restriction muffler that was relatively quiet and had good flow. Hence, everyone was going to the auto parts stores and asking for Corvair Turbo mufflers. Now everyone and their brother in manufacturing "turbo" mufflers.