#120934 - 04/26/05 07:32 PM
Gas Mileage + Performance Mods
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Registered: 04/17/05
Posts: 56
Loc: Houston
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So what performance mods help gas mileage?
I know the u-bend delete will, as well as some other exhaust mods.
But what specifics?
How many MPG can be gained?
Will it pay itself off if gas is 2.00-2.15 a gallon?
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1997 Pontiac Grand Prix SE w/ 3800 Engine Package
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#120935 - 04/26/05 07:52 PM
Re: Gas Mileage + Performance Mods
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Registered: 10/23/04
Posts: 283
Loc: Florida
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Never worry about MPG's.
And gas down here is $2.40 for Prem.
Feel lucky.
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#120936 - 04/26/05 08:00 PM
Re: Gas Mileage + Performance Mods
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Registered: 04/21/05
Posts: 159
Loc: New York
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That's a pushy subject. There are many possibilities for a "econ" mod. Most mods are economic. I wont even begin to start but lets say Intake, pcm, Spark plugs, Ignition sys., Exhaust system. blh blah blah. No accurate way to tell you a MPG saved either. Soo many variables. Im sure there are a few members that can help you out
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J.C. & K.C.  " A true REAL mod takes longer than 1 hour to install" " Dont like it then smile like a donut "
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#120937 - 04/26/05 08:07 PM
Re: Gas Mileage + Performance Mods
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Member
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Registered: 04/17/05
Posts: 56
Loc: Houston
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Thanks..
Well I am asking because I may get my dad to pitch in if it helps my mpg enough...if I do anything at all...
Not thinking about real big internal mods or anything...more intake, exhaust stuff...pcm-not sure how much stuff like that runs but it could be a possibility...
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1997 Pontiac Grand Prix SE w/ 3800 Engine Package
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#120938 - 04/26/05 08:35 PM
Re: Gas Mileage + Performance Mods
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Member
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Registered: 04/17/05
Posts: 56
Loc: Houston
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Also if I do a CAI will that help my engine as well (I hear it helps mpg but I could be wrong) since it keeps it cooler?
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1997 Pontiac Grand Prix SE w/ 3800 Engine Package
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#120940 - 04/26/05 09:47 PM
Re: Gas Mileage + Performance Mods
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Registered: 03/26/03
Posts: 2481
Loc: Franklin, MA
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I only saw an increase in MPG when I did a full tune up at 75k miles.
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#120941 - 04/26/05 09:55 PM
Re: Gas Mileage + Performance Mods
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Registered: 11/13/04
Posts: 70
Loc: Copperas Cove, TX
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I see much better mileage when I use Chevron 89 octane versus 87. And when I use cheaper gas, like from 7/11 (been a LONG time since I used that crap) I notice the MPG falls way off. I've got mods that both help and hurt fuel economy, but for sure the intake, downpipe, UD pullies, ported TB and exhaust manifolds help mileage.
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Black '99 GT Coupe: 15.2 @ 88.6
Red '97 GT Coupe: FWI
Gold '00 Blazer: Might hand TexasGP his ass with the new intake...
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#120942 - 04/26/05 11:20 PM
Re: Gas Mileage + Performance Mods
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Registered: 07/08/04
Posts: 652
Loc: Imperial MO
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Would a fuel filter affect mileage at all? I've done a full tune up other than the fuel filter, which is on the long list as soon as I get a chance. I guess I should do that soon, eh? With 122K on the thing. Anyone know how long these motors last, I'm starting to worry now that I'm getting closer and closer to 150K.
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 -Dan- SOLD-1998 Grand Prix GT with 148K. Infinity Reference 5.25s, Pioneer 4 way 6x9s, Yokohama AS430s, Open cone K&N intake, Front strut bar,180* Powerstat, Dual glasspack mufflers w/ removed resonator, and painted under-hood components.-SOLD- 1995 Eagle Talon TSi AWD - 81K, 3" turbo-back exhaust, open cone intake, hard IC piping, boost controller, GReddy Type-S BOV, more to come.
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#120943 - 04/26/05 11:49 PM
Re: Gas Mileage + Performance Mods
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Member
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Registered: 05/23/03
Posts: 8078
Loc: Austin, TX
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I'd change it. I need to change mine this weekend.
_________________________
Bobby
Died 5/1/08, resurrected 5/15/08
ASCD SD hood, 17" Bullitts, Overkill PCM, 3.4" Pulley, NGK TR55IX, K&N 9" cone filter, JimmyC D/P, U-bend removed, Flowmaster 40 series, Hooker big bore tips with resonators, S/B brake lines, drilled/slot rotors, GMPP handling kit, KYB struts, F&R strut supports, HID's, LED's, 2.5" Air Dam, red GTP overlays on custom badges, white rear insert.
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#120944 - 04/27/05 01:47 AM
Re: Gas Mileage + Performance Mods
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Member
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Registered: 03/11/05
Posts: 136
Loc: Madison, WI
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Originally posted by nad:
Anyone know how long these motors last, I'm starting to worry now that I'm getting closer and closer to 150K. I have a friend that had an 89 Regal GS with the 3800 (obviously earlier version), and he had that thing up to like 350k+ miles, but that may be a rare happening... I would suspect they most will last up to and past 200k as for mods adding mpg, I think most bolt on stuff like exhaust and intake stuff, will add mpg IF you are easy on the accelerator. Other mods, such as cams, obviously decrease mpg
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 Galaxy Silver Metallic 2001 GT ~ 70k miles Eclipse CD5425 deck, Eclipse & Kenwood speakers, Silverstars, rear bumper inlays, debadged, Flowmaster Super 40s and Gibson tips
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#120946 - 04/27/05 08:50 AM
Re: Gas Mileage + Performance Mods
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Member
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Registered: 05/23/03
Posts: 8078
Loc: Austin, TX
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3800 is a solid motor.
_________________________
Bobby
Died 5/1/08, resurrected 5/15/08
ASCD SD hood, 17" Bullitts, Overkill PCM, 3.4" Pulley, NGK TR55IX, K&N 9" cone filter, JimmyC D/P, U-bend removed, Flowmaster 40 series, Hooker big bore tips with resonators, S/B brake lines, drilled/slot rotors, GMPP handling kit, KYB struts, F&R strut supports, HID's, LED's, 2.5" Air Dam, red GTP overlays on custom badges, white rear insert.
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#120947 - 04/27/05 11:03 AM
Re: Gas Mileage + Performance Mods
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Member
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Registered: 07/15/04
Posts: 3141
Loc: Chicago, IL
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It's solid as long as you take care of it.
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DHP V1.0, Slotted rotors, S/S Brake Lines, Custom CAI, GMPP Handling Kit, KYB's, Jimmy C DP (U-Bend delete w/ Hi-flow cat), Flowmaster Super 40's, drilled 180° T-Stat, Alt. Rewire & Alt. Voltage Booster Combo, 605's, ZZP Motor Mounts
"The only difference between me and a madman is that I am NOT mad!" - Dali
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#120948 - 04/27/05 01:07 PM
Re: Gas Mileage + Performance Mods
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Member
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Registered: 03/26/03
Posts: 2481
Loc: Franklin, MA
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Originally posted by nad:
Would a fuel filter affect mileage at all? I've done a full tune up other than the fuel filter, which is on the long list as soon as I get a chance. I guess I should do that soon, eh? With 122K on the thing. Anyone know how long these motors last, I'm starting to worry now that I'm getting closer and closer to 150K. The fuel filter is one thing that can do a lot of damage to gas mileage. They get gummed up pretty quickly. Change it every 30k. High octance gas will get you better mileage because of the way it burns.
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