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Re: Performance car...fuel economy....what do you get?
[Re: GLR]
#1003185
05/31/11 11:08 PM
05/31/11 11:08 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
I guess I din't make my post clear enough?
O.K.
One of my friends has a 1970 Dart with 31" tall tires, 15" wide and with 3:23 gears...727 automatic and a 360 Mopar performance crate engine -not sure on cam size but has an airgap intake and Holley 750 carb-(calabrated) and when we went to the Mopar Nationals last year on the higway gets aprox. 16-17 mpg
My wifes 72 Charger has a 3:23 rear 28" tall tires with a 727 transmission and a stock bore 400 engine with a 1963 2 4BBL intake and two 500 CFM Eldelbrock carbs ..runs good, no real power house but she likes it but doesn't get very good fuel econmy on the highway, best we have gotten is 12 mpg...
Very similar mpg on my old smallblock! I'm sure I could've tweaked it into the 20's pretty easily.
My 440 used to get 14 mpg tooling along at 70mph with 3.23 gears. Had a mild cam, headers and stock intake. 9.5:1 CR.
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Re: Performance car...fuel economy....what do you get?
[Re: GLR]
#1003189
06/01/11 08:41 AM
06/01/11 08:41 AM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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with my toy...it's a toy. if I can afford gas, then I go play. if I can't buy any gas, then I don't drive it.
lucky for me, it's VERY mild right now and gets good mileage.
what I'm currently driving around as my toy is a 98 regular cab dakota, 5.2L 5 spd, 2wd, 3.92 gears with an LSD. heads are shaved to up compression, it's got a 220 duration cam with a 114 LSA, 3" exhaust, and a custom computer tune on the factory PCM for the EFI.
I estimate it's around 300 hp right now, not blistering fast, but in this truck, it's enough to have fun with and make it an enjoyable ride. I can go WOT in 2nd gear around a corner and get the back end to slide out on me.
and, I'm getting 17 MPG on the highway...in what has to be nearly 4000 lb truck. --my other 98, a club cab, with a V6 weighed 4000 even with me in the seat, and that jumped up to 4200 when I had a big block with aluminum heads, intake, water pump housing, in it, so I figure this Reg cab V8 with iron heads is probably within a few hundred pounds of 4,000
**Photobucket sucks**
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Re: Performance car...fuel economy....what do you get?
[Re: GLR]
#1003191
06/01/11 10:48 AM
06/01/11 10:48 AM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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I won't be hauling too much with it!  It's got drop springs on it, so it sits 2" lower up front and 3" lower in the back. I bet if I put more than 500 lbs in the bed, it'll be sitting on the bump stops, when my old V6 dakota has had up to 1700 lbs in the bed and was still driveable 15 minutes across town  I've got a motor in the works though...I don't think it'll be getting 17 on the highway anymore! 360 with a .030 head shave, 1008 fel-pro head gaskets to bump up compression considerably, and a nasty NA cam that's 230-ish duration on a 106 LSA. my engine program writer says he should be able to write an engine tune for it, but we may have to keep it in open loop full time, because the amount of overlap will drive the O2 sensors crazy, and the PCM might try to lean it out too far at part throttle cruise.
**Photobucket sucks**
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Re: Performance car...fuel economy....what do you get?
[Re: GLR]
#1003192
06/01/11 12:04 PM
06/01/11 12:04 PM
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Joined: Feb 2003
Posts: 1,665
Milwaukee, WI
Prince_Valiant
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,665
Milwaukee, WI
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The first iteration of the Valiant ran a decent 14.27 @ 94mph.
Mild 360. 9:1 compression, stock 1.88 valves w/ 3 angle valve job, MP ignition, eddy performer (non-rpm) 318/360 manifold, holley vacuum secondary 600, headers and an MP .450/.455 cam. Idled w/ 16 inches of vacuum.
Transmission was an 833OD unit. Gears 2.94, open diff.
On long hwy trips for which this thing was great, it usually returned b/w 20-22mpg, with one trip netting as high as 24-25. This was a mpg or two better than the tired 318 it had when I purchased it. By the end, with the mech secondary carb it was lucky to get 12mpg....
Purchased a coronet w/ a 318 from a member here. Stock long block/heads w/ offy intake, MP ignition, eddy 600 with new metering rods/jets, small summit cam, headers. 904 auto backed by 2.76 gears. Ran 15.1 @ 91mph, and driving back from maine the worst tank was 17.5 going b/w 75-85mph, best was 20.5 going 65mph.
Stock long block magnum w/ holley 600 and MP ignition, stock manifolds and eddy performer rpm intake in the Little red truck 15.1 @ 90mph, mileage b/w 15-16mpg reasonably driven.
all mileage are hwy mpg's.
1979 Dodge Lil' Red Express - 360 rwhp, 13.2 @ 103mph
1968 Coronet: 318, 2.76, 15.2 @ 92mph! (SOLD)
1976 Valiant: 360, 3.90, 12.90 @ 106 (SOLD)
1989 Shelby CSX #500/500
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Re: Performance car...fuel economy....what do you get?
[Re: pro6pakRR]
#1003195
06/02/11 03:44 AM
06/02/11 03:44 AM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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HOW ABOUT this for a goal ? .... the ability to run 11.99 ...and get 20 mpg. And NOT with a steep OD manual trans or a high$$$ lockup OD auto trans OR super-trick converter. A lite AERO car... with a short gear and a efficent/effective fuel delivery system. As soon as I get settled in FL ... that will be my "mission" in life .... 
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Re: Performance car...fuel economy....what do you get?
[Re: 68SportSatvert]
#1003196
06/02/11 06:42 AM
06/02/11 06:42 AM
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Joined: Jan 2005
Posts: 4,862
the frozen wastes...
Pale_Roader
Swears too much
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Swears too much
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
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Quote:
This may be a bit off target but here's my take on our cars and the expense to drive them and have fun. Any of you own or ever own a boat? The pleasure of operating a boat is measured in gallons per hour. My point is this is a hobby and we need to enjoy our hobby the best we can. Maybe that means pulling the big block and dropping in a late model small block with FI and an o/d trans. Still get to enjoy the car and get good mpg but it may not have the grunt it had with the big block. That's the trade-off we make but still get to enjoy!  
And thats exactly what i plan on doing. My original big block build has become more ov a temporary fix now. I would completely abandon it for the new stuff, but i have pretty much all the parts, and unlike the modern stuff, its a very simple bolt-in... not a 3 month project involving engineers and scientists. So i'll build my stock stroke lowdeck for now with a 4-speed, but the PLAN is for a much smaller, lighter engine making about the same power or just a bit more, with EFI, 5 or 6 gears, and at least 200 less pounds over that long nose. Cant wait!
But for now, in my current car, the 72 Charger, life is a mess. Low-comp 440, 6-pack-ish cam (size), Holley SD manifold, Holley 750 vac-sec, stock heads, electric ign., Hooker Comps and a 3" mandrel X-pipe exhaust, 727 w stock converter, 8 3/4" w 3.23 sure-grip... 8mpg. Thats combined, though mostly in town... i rarely go anywhere in it due to cost. I dont give a [Edited by Moparts - Family Friendly Site - Keep it clean] HOW fast it is... (and mines not, particularly...) 8mpg is just not fun. Some ov us dont have good jobs or lines ov credit.
Hell, even my 68 Caddy hearse that weighs near-6000lbs (about 2000lbs... one TON more than my Charger) with its 30+ cid larger engine, the aerodynamics ov a freight train and 20ft ov heavy steel drivetrain (TH400, 2 shafts, massive coupler, massive axle and brakes, 31" mud tires) gets better mileage than the damn Charger... 11 combined last i checked... and thats with a pretty gross exhaust and single point ignition... and lots ov other issues to cost me mpg.
There was also a 'these are toys' comment in here, and thats the case for many here, but some ov us can only have one car insured... so if its not the 'toy' then its some POS and there is little use even owning the toy. My aim is to drive the toy every day, and actually get around in it... and i mean get around. Last time i had a good-on-gas car insured i'd find myself all over creation in it... just like you could do 20 years ago... And THAT... is 10X the fun ov owning a 600HP car that gets 8mpg and never leaves town in my opinion.
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Re: Performance car...fuel economy....what do you get?
[Re: GLR]
#1003200
06/03/11 02:32 AM
06/03/11 02:32 AM
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Joined: Dec 2003
Posts: 1,153
Adrian, Mi
pro6pakRR
mopar addict
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mopar addict
Joined: Dec 2003
Posts: 1,153
Adrian, Mi
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Quote:
Yea...pro6pakrr....Your 70 Road Runner...may be a gas guzzler...but I bet it is one fast runner at the track!
We hope to go mid 10's this year.
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Re: Performance car...fuel economy....what do you get?
[Re: GLR]
#1003202
06/03/11 07:20 AM
06/03/11 07:20 AM
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Joined: Jan 2005
Posts: 4,862
the frozen wastes...
Pale_Roader
Swears too much
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Swears too much
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
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Quote:
Being wasteful isn't smart if you have the capability to improve.
Exactly. Inefficiency is just another form ov wasted power. We all want more power...
Quote:
So....Pale_Roader ...is you plan to eventually build a small block Magnum engine or...one of the new Hemi's?
I was going to retro fit a 5.7 Hemi into a customers car but the customer desided that it was going to be too expensive to do, so he had me build and install a 5.2 Magnum for his ride.
Maybe soon ...it will be cheeper to do a 5/7 Hemi into an older car...time will tell..
No new Hemi, still not a huge fan ov the idea. Also not a fan ov the Magnum smallblocks... just new(er) top end on an ancient engine. I like them... but not for this car. Think smaller... and DOHC...
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