#137156 - 01/29/07 02:12 PM
MPG
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Junior Member
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Registered: 01/25/07
Posts: 6
Loc: knoxville
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Got 28.3 mpg average on the GT2000's maiden voyage to Chicago from Des Moines, IA. Just wondering how you guys do on mileage. I am thinking about doing the U bend delete, a high flow cat, and a new fuel filter. Any other suggestions to increase my mileage would be greatly appreciated.
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just bought it and looking to mod it.
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#137157 - 01/29/07 02:43 PM
Re: MPG
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Registered: 03/02/06
Posts: 1059
Loc: Brooklyn, NY
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With all the mods in my sig i top out at 34mpg the best hing to do is open the exhaust and let her breath easyer. Or in the words of drummerboy , i think, let it breath better and fart better...
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---Ray Dawson--- 1997 Grand Prix GT: ZZP SS M90 Kit--P&P Blower and LIM--3.8" Modular pulley--36# injectors--ZZP Wizair CAI--8.5mm MSD Wires--Autolite 103s@ .052--180* drilled T-stat--Tune Time Performance Tune--ZZP 2.5" D/P w/o Cat--ZZP Stage 1 HV TB--ZZP Power Log & Rear PEM--ZZP Poly Motor & Tranny Mounts--Flowmaster 40 Series Delta Flow Mufflers--Auto Meter Z Series Boost & Oil Pressure Gauges--Aeroforce Interceptor Scan Gauge New York Metro Club Grand Prix www.nymcgp.com
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#137158 - 01/29/07 02:56 PM
Re: MPG
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Junior Member
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Registered: 01/25/07
Posts: 6
Loc: knoxville
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The only thing I want to stay away from is loud exhaust. I don't really know of any good high flow mufflers that aren't loud.
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just bought it and looking to mod it.
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#137159 - 01/29/07 03:13 PM
Re: MPG
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Member
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Registered: 10/05/05
Posts: 467
Loc: Niagara Falls, NY
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you really dont need them. the manifolds are horrible, especially the front one.
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 Homemade K&N FWI, Ported Mani's, 3" RT DP soon: PCM, HV TB, HV3
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#137160 - 01/29/07 03:38 PM
Re: MPG
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Registered: 04/18/05
Posts: 8901
Loc: Bradenton, FL
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just stick with the stock muffs. go with a 3in DP, Headers, and u-bend delete
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Corey Smith 
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#137161 - 01/29/07 03:41 PM
Re: MPG
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Junior Member
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Registered: 01/25/07
Posts: 6
Loc: knoxville
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Will headers help or hurt my mileage? I've heard both ways with different cars.
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just bought it and looking to mod it.
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#137162 - 01/29/07 09:50 PM
Re: MPG
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Member
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Registered: 04/30/06
Posts: 3201
Loc: Groton, CT
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Originally posted by D:
Or in the words of drummerboy , i think, let it breath better and fart better... Yep, that was me!  I just took a trip to St Louis in my GP (approx. 500 miles round trip) and even all the highway driving I did, I only averaged 22.6 mpg. I think it's cuz of my torque converter being screwed up, because I know it should be higher than that. Anyone have any other ideas?
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 '97 SE with alot of mods
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#137163 - 01/29/07 10:24 PM
Re: MPG
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Member
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Registered: 03/02/06
Posts: 1059
Loc: Brooklyn, NY
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Well for N/A applications, I beleive, Headers aren't good for gas milage for our cars b/c you loose some of the back pressure needed for the eninge, the best thing for N/As is some nice ported manifolds and a D/P.
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---Ray Dawson--- 1997 Grand Prix GT: ZZP SS M90 Kit--P&P Blower and LIM--3.8" Modular pulley--36# injectors--ZZP Wizair CAI--8.5mm MSD Wires--Autolite 103s@ .052--180* drilled T-stat--Tune Time Performance Tune--ZZP 2.5" D/P w/o Cat--ZZP Stage 1 HV TB--ZZP Power Log & Rear PEM--ZZP Poly Motor & Tranny Mounts--Flowmaster 40 Series Delta Flow Mufflers--Auto Meter Z Series Boost & Oil Pressure Gauges--Aeroforce Interceptor Scan Gauge New York Metro Club Grand Prix www.nymcgp.com
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#137164 - 01/29/07 11:06 PM
Re: MPG
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Member
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Registered: 04/18/05
Posts: 8901
Loc: Bradenton, FL
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Originally posted by GT2000:
Will headers help or hurt my mileage? I've heard both ways with different cars. it will help you. I dont know how it would hurt. But with an N/A car. PEMS might be the way to go. You dont want to lose all of your torque 
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Corey Smith
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#137165 - 02/02/07 03:48 PM
Re: MPG
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Junior Member
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Registered: 01/25/07
Posts: 6
Loc: knoxville
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I've been doing my research and people are saying that only the front one will make a noticeable difference due to its design. I guess that the rear manifold flows enough unless you're blown. I'm thinking that it is a lot easier to replace the the front by itself also.
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just bought it and looking to mod it.
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#137167 - 02/06/07 03:18 PM
Re: MPG
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Member
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Registered: 12/13/06
Posts: 151
Loc: Illinois
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i average 15 in the city.  i have a vacuum leak that im waiting for a warm day to fix
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#137168 - 02/07/07 04:45 AM
Re: MPG
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Member
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Registered: 02/08/04
Posts: 3463
Loc: Gonzales Tx.
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Another option instead of a ported front mnfld. is ZZP's power log, it adresses the problem front mnfld. and is similar in design to the factory rear mnfld. .Chico.
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#137169 - 02/07/07 11:34 AM
Re: MPG
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Member
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Registered: 04/05/05
Posts: 1921
Loc: Texas
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I've topped out at 34.8 hwy and had a low of 13.6 due to special circumstances .. All stock 02 GTP, save for a CAI.
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Originally posted by HercMan:
Sounds like corrosion has had it's way with your nuts.
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#137170 - 02/10/07 01:01 PM
Re: MPG
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Member
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Registered: 02/09/07
Posts: 167
Loc: Kentucky
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Ok, ya'lls 30+ MPG is ticking me off. I have a friggin 3.1 and only geting 21 with a mix of highway and city.
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--Kevin--
2005 Grand Prix GT
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