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Old 01-05-2019, 06:10 PM   #1
bumblebeeman
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Im looking for more info on builds that are getting 35+ MPG. have searched what seem like endless threads but I'm not finding much. I know this info is out there. does anyone have it bookmarked??

Thanks

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Old 01-05-2019, 06:26 PM   #2
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Im looking for more info on builds that are getting 35+ MPG. have searched what seem like endless threads but I'm not finding much. I know this info is out there. does anyone have it bookmarked??

Thanks

BBman
Lol, You're fighting quite the coefficient of drag to try to get 35+ mpg out of a brick shaped object. I think the 240 is around .45 coefficient of drag, my greatly more aerodynamic Toyota (.32 cod) with a 1.8 with modern engine management and far better flowing head and manifolds and a 6spd MT only gets 33mpg with a very light foot on the highway.
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Old 01-05-2019, 08:18 PM   #3
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Lol, You're fighting quite the coefficient of drag to try to get 35+ mpg out of a brick shaped object. I think the 240 is around .45 coefficient of drag, my greatly more aerodynamic Toyota (.32 cod) with a 1.8 with modern engine management and far better flowing head and manifolds and a 6spd MT only gets 33mpg with a very light foot on the highway.
not arguing with you, but I remember at one point Eco Bricks was a club within Turbobricks and you needed to be able to confirm you were getting at least 30 MPG I believe. I'm just looking for info. In my old RSX I used to easily get 34.. but were not talking JDM were talking redblocks....
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Old 01-05-2019, 08:41 PM   #4
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I regularly get 34-37 mpg city/hiway mix year in year out. 1985 745 D24T/M46, running full synthetic 5w-40 in the engine, dino type F ATF in the M46, dino (90W?) in the differential, Goodyear 195/65-15 Wintergrip Ice @35PSI.
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Old 01-05-2019, 09:03 PM   #5
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A diesel is a good way to get it done. maybe I should do a diesel swap? anyone to there running a Waste Veggie Oil Diesel powered brick?

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I regularly get 34-37 mpg city/hiway mix year in year out. 1985 745 D24T/M46, running full synthetic 5w-40 in the engine, dino type F ATF in the M46, dino (90W?) in the differential, Goodyear 195/65-15 Wintergrip Ice @35PSI.
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Old 01-06-2019, 01:31 AM   #6
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Best of 6.5L/100k or 36mpg in my 1990 245. That's almost all highway, 235/45/16 continental dws06 tires, 3.73 gears, Mitsubishi 4d56t diesel, fmic, 3" exhaust, water meth injection. Can't remember the ratio of 5th in the transmission (km132) but it's about 2900rpm at 110km/hr
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Old 01-06-2019, 03:00 AM   #7
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This would be ideal for a diesel swap in these cars:
https://www.cummins.com/engines/repower

At 161hp/310ft-lb and a set of 3.73 gears, the thing would scoot as well.
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Old 01-06-2019, 09:21 AM   #8
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If you're going to cheat and go diesel then yeah you should make your goals. Just add 10 mins eta to every trip.
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Old 01-06-2019, 09:55 AM   #9
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Just get one of these, without a working IMA battery, 55mpg is without even trying.



40-45 mph no stops nets

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Old 01-06-2019, 12:09 PM   #10
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4.8 LSx/t56 swap and 3.54 rear= 40+ pretty easy I'd imagine
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Old 01-06-2019, 12:16 PM   #11
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Eco-Bricks - 35+mpg club
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Folks on here don't know a good deal when they see it.
how psi stock cna support?

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Old 01-06-2019, 01:50 PM   #12
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I sister gets 30+ on normal running around in her beater 240. On a run just over 35MPG. Other than removing the cat and lowering it is pretty much how it left the factory - just years of battle scars
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Old 01-06-2019, 04:26 PM   #13
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If you're going to cheat and go diesel then yeah you should make your goals. Just add 10 mins eta to every trip.
If I have to add 10 mins eta to every trip it's not because the D24T can't keep up; it's because of increasing traffic gridlock in a rapidly growing city with severely lagging infrastructure improvements. Which probably means my MPG average would actually be higher if it were not for so much stop and go in the mix.

BTW how is this cheating? Factory stock, all tuning is in factory spec. (timing, injector pressure, injection pump fueling settings, etc.). The only improvement over as-delivered condition is running synthetic oil in the engine, which was not available in 1985.
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Old 01-06-2019, 04:36 PM   #14
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A diesel is a good way to get it done. maybe I should do a diesel swap? anyone to there running a Waste Veggie Oil Diesel powered brick?
I ran WVO, from 2005 - 2011. During that period, my avg. MPG for petro diesel was in the 70-90 MPG range, mixed city/hiway.
I wouldn't recommend a diesel swap just to incrementally raise your MPGs. Unless of course you are wanting a steampunk-type project for kicks.

Wasn't member Cwazywazy putting a MB 5-cylinder in his brick?
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Old 01-06-2019, 05:05 PM   #15
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I sister gets 30+ on normal running around in her beater 240. On a run just over 35MPG. Other than removing the cat and lowering it is pretty much how it left the factory - just years of battle scars
I would assume we're talking US gallons since this is a USA based forum?
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Old 01-06-2019, 07:13 PM   #16
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Originally Posted by tintintin View Post
If I have to add 10 mins eta to every trip it's not because the D24T can't keep up; it's because of increasing traffic gridlock in a rapidly growing city with severely lagging infrastructure improvements. Which probably means my MPG average would actually be higher if it were not for so much stop and go in the mix.

BTW how is this cheating? Factory stock, all tuning is in factory spec. (timing, injector pressure, injection pump fueling settings, etc.). The only improvement over as-delivered condition is running synthetic oil in the engine, which was not available in 1985.
Dude, I'm just joking around, if you want to run a stinky 2 timing chain or is it belts? diesel VW motor have at it. Diesel soot is bad for human breathing though.
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Old 01-06-2019, 11:34 PM   #17
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If you're going to cheat and go diesel then yeah you should make your goals. Just add 10 mins eta to every trip.
That new Cummins engine is the same HP as the b21ft - with 100 ft-lbs more torque.

Pretty sure you would subtract 10 minutes.

And get 30 MPG+
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Old 01-07-2019, 06:58 AM   #18
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That new Cummins engine is the same HP as the b21ft - with 100 ft-lbs more torque.

Pretty sure you would subtract 10 minutes.

And get 30 MPG+
Did anyone get a price on a new Cummins engine, because a reman 4BT is north of $7K? How much bensin can you buy for that kind of money? How many 740T's can you buy for $7k?
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Old 01-07-2019, 11:44 AM   #19
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I sister gets 30+ on normal running around in her beater 240. On a run just over 35MPG. Other than removing the cat and lowering it is pretty much how it left the factory - just years of battle scars
Your gallons are much bigger because your pints are 20oz, quarts 40oz....while ours are 16oz and 32oz...that's a whopping 25% bigger-er.

Your 35 is our 26.25 Em Pea Gee
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Old 01-07-2019, 04:26 PM   #20
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24 mpg would be pushing it.
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Old 01-07-2019, 07:03 PM   #21
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Best bet would be to ditch everything and EV swap it. If you diy it could probably be done for the cost of an lsx swap.
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Old 01-07-2019, 07:09 PM   #22
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My 940t with 3.31 and m47 can get 25 combined if im easy on the gas. Highway only I can get 28-31ish. Typical driving nets 20ish.
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Old 01-07-2019, 09:26 PM   #23
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Did anyone get a price on a new Cummins engine, because a reman 4BT is north of $7K? How much bensin can you buy for that kind of money? How many 740T's can you buy for $7k?
Its between $8 - 9K once you are done I expect.

The question wasn't about cost, it was about feasibility. Frankly, I'd love to do one of these motors, although I'll likely do it in my 72 Jeep Wagoneer in a few years. The nice thing is that it has as much torque as the AMC360, but weighs about 2/3 of that iron lump.

My B23F with an H cam gets between 24 - 26 MPG reliably.

I drive ~30K/year in my 242 (long commute). I figure that I would need to hit 50 MPG in order to justify the cost involved in any of the diesel swaps out there. I'm not confident that this swap (or any diesel swap) would get me there. I figure that if it hit 50 MPG, I would have a simple payback of about 5 years assuming that fuel hovered about $3/gal. That's not bad at all, but I just cant bring myself to try to justify the project cost and time to my other 1/2. The Wagoneer will be an easier sell (she likes that vehicle).
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Old 01-08-2019, 09:23 PM   #24
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Hi
I am in England so we might have a bit of a problem understanding
I run a 16 valve penta 2.5 on Gas Lpg Butane
I cant remember the last time i used petrol
You could use Propane from red bottle ? in england and transfer to the car a pump is about 100 pounds
I dont know if you get them in USA
in England you can get a big white tank 1000 lts its for a house and get the Gas from that
petrol is 1.28 a ltr and gas is .70 a ltr at a petrol station pump a big saving from a white tank even cheaper
last year in France Gas was .20 a ltr
so cheep as chips and about half the emissions of Petrol
Volvo UK sell cars that run on Gas or Petrol called dual fuel
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Old 01-09-2019, 08:39 AM   #25
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Hi
I am in England so we might have a bit of a problem understanding
I run a 16 valve penta 2.5 on Gas Lpg Butane
I cant remember the last time i used petrol
You could use Propane from red bottle ? in england and transfer to the car a pump is about 100 pounds
I dont know if you get them in USA
in England you can get a big white tank 1000 lts its for a house and get the Gas from that
petrol is 1.28 a ltr and gas is .70 a ltr at a petrol station pump a big saving from a white tank even cheaper
last year in France Gas was .20 a ltr
so cheep as chips and about half the emissions of Petrol
Volvo UK sell cars that run on Gas or Petrol called dual fuel
That sounds like a big leap towards socialism/communism, maga needs coal fired cars to keep the mines open.
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