best swap for fuel economy?

[g6civcx]

Originally Posted by highly responsive

Like frame reinforcement, driveshaft, etc?

You don't need any more frame reinforcement than you normally would. People with SR and KA put out insane torque figures as well.

Definitely yes on the driveshaft, but the good thing is the Driveshaft Shop will make you one for around the same price as an SR/KA driveshaft, depending on how nice you are to them. Of course there is an markup for idiotic customers.

The etc. part will be hefty. It all depends on how good you are at fabrication. Everything will need to be fabricated or at least you have to mix and match stock parts.

[Firestorm]

CA takes about as much gas as SR. believe me, i had/have both

[doug810]

There is a bolt-on kit.
http://sikky.com/products/mount_kits/ls1__s14_240sx

It's on the high side but all you need is the wiring, ECU and exhaust

Other options are:
http://www.daftinnovations.com/
http://www.hinsonsupercars.com/s-3-n...0sx-89-94.aspx

It might cost more up front but remember you are getting 340 hp and getting 30 mpg.

[240sxaddict]

If you're worried about gas mileage you should be modifying the car to support that. Aluminum undertrays/diffuser, lighten everything, and much more.

Hell my beater hatch gets 32mpg highway if I keep it out of open loop and I'm not hauling anything.

[Dutchmalmiss]

Originally Posted by 240sxaddict

If you're worried about gas mileage you should be modifying the car to support that. Aluminum undertrays/diffuser, lighten everything, and much more.

Hell my beater hatch gets 32mpg highway if I keep it out of open loop and I'm not hauling anything.

Honestly, lower weight and drag coefficient is where it's at. If you have balls and have AAA, then run an empty rear interior (half gutted) and no spare tire. I tried it for shits n giggles and I gained about 2-3 mpg. I just put everything back because I have passengers to take with me haha.

No matter what motor you have, the less weight to pull around = less needed power = less gas consumed = less vagina wanting you

[GSXRJJordan]

^^^ No lie.

My S14 is completely gutted. I recently added a passenger seat, and was lamenting how much weight it added (almost 30lbs with bracket/slider!).

It's literally as light as you can get an S-chassis - I guess I could run a Ti exhaust to save 10 more lbs, but shit... it's supposedly under 2500lbs (that's what another identical car weighed in at - I haven't weighed mine yet).

The motor is stock except for GT28 running on the wastegate. Probably makes 200hp.

I have C-West aero that sits less than 2" above the ground (too low, but I'm too lazy to change it right now), no wings, it's safe to say the car's aerodynamic.

I recently drove 224mi (work twice, out with friends, and then down to the beach), mostly freeway but I don't drive conservatively on the freeway - if there's an opening to spool it up for a sec, I took it...

Went to fill up and it took 8.2 gallons. >27mpg. This means I could hit 30mpg with ease. This means it makes more sense to daily drive my S14 than my Tacoma.

This is a problem for me.

[thefro526]

I DD my stock KA24DE everyday going through the same exact route to work. I've noticed that when work stresses me out in the afternoon I get substantially lower gas milage because I tend to drive a bit harder. Usually in the morning when I go to work at about 7:45 with similar traffic as when I'm going home at 3:30 I get much better mileage because I'm more relaxed. Any motor can get good mileage you just have to remeber that the street isn't a racetrack.

If you don't believe me try to do your normal drive for a week shifting at about 2700 to 3000 RPMs and you'll notice a significant change in fuel economy with only a slight decrease in acceleration. In all seriousness you almost never need to do above 3K in most drives anyways unless you need to accelerate really hard. IIRC, 3k in an SR/KA S13 is about 70 mph give or take a smidge.

I also have a friend who just bought an S13 with a turboed single cam KA and he said it get horrible gas mileage because of the tune, so a good tune changes gas mileage a lot. The same friend said when he used to have his SR he used to get great gas mileage because he never drove in boost if it wasn't necessary. IMO if I were going for fuel economy I would go SR because of the ease of the swap and when you're driving out of boost you're just driving a 2 liter four banger around.

[lazysk8er2]

if your trying to save money you would be spending more on swaps and upgrades. the effort and money put into dropping a different motor or w.e will be pointless. with that said it all depends if you just dont floor it all the time and cruise on highways with no traffic.

[Sir]

Originally Posted by highly responsive

Best swap for fuel economy.

Originally Posted by highly responsive

lets imagine that money isnt an issue.

wait for it...

[Vision Garage]

Get a 3 cylinder motor in there. But i swear you better not come bitching about how it has no power. You either get really good gas mileage and no power or bad mileage with good power. If you are complaining right now about gas, you are in the wrong hobby my man!

[louisdaboois]

for ultimate fuel economy swap. definately go for a D16 (or whatever) honda series motor. because they're obviously econoboxes. or drop in a 800cc bike motor.

all in all, youre 240 might not get out of its own way, but damnit, it'll get 40+mpg

[drift freaq]

I will just say this. Your car is a Sports car, Gas mileage is not a primary concern. LOL If you really are getting that concerned about Gas mileage with it then you should just buy a gas sipper. a 92 Civic will get you 35-40 mpg and cost you $1500-2k. Ya you could drop a SR,VQ,LS1, in the end you should not be putting any of these engines in for the sake of gas mileage. You will spend a lot more extra cash doing these swaps than it would cost to buy a gas saving car.
If your going to do one of these swaps it should be about the HP gains. I am doing a VQ swap, while Gas mileage gains are a plus, I have to honestly say I do not plan on daily driving the car anymore. I am putting it in for other reasons, like lots of NA HP with it being smog legal!

[redclaw05]

i just stay out of boost and my needle does not drop very much. i try to stay at less then 10% throttle as well.

[HolyShiznit]

Worried about gas mileage in the same sentence as doing a swap/power mods = fail.

Just don't mod the car. Or save up your money, buy a cheap little Honda civic to DD and THEN mod your car with whatever gas eating engine you want.

Seriously, if mileage, and premium fuel prices are something you are concerned about in your performance car then you shouldn't be toying with it.

[SoguRacing]

the best swap is no swap at all.

[hustlervibes]

Originally Posted by The ROMAN

What about an N/A SR? I looked around for mpg figures but couldn't find anything, short of comparing to an SR Sentra. I would assume it'd beat out a KA by quite a bit and they're not too expensive.

BTW fueleconomy.gov lists SOHC KA as 18/24 and DOHC KA as 19/26. SR Sentra is 21/29.

NA SR? What? You'd be better off with the KA. The KA has better numbers than the NA SR, why would you down grade?

[The ROMAN]

I'm saying for fuel economy. I can't find any real numbers for mpg in SR 240s aside from what people say they get, but I figure a lighter, smaller, newer motor would get better mileage than a heavier, bigger, older motor.

And yes I know the KA what still used until the latest Frontier or something, but that's a truck not a smaller car, so the aim is gonna be sacrificing mpg for extra power. Small trucks don't get the mileage small cars do.

Honestly the easiest thing is to get a civic or something, better mpg, and less worries about stuff like dings and dents.

[SoguRacing]

this thread is a waste of time. stick with what you have. it will take several years worth of gas to make up for the cost of doing the swap. You probably will never break even saving 15 cents per gallon mileage wise.

[g6civcx]

Originally Posted by SoguRacing

this thread is a waste of time. stick with what you have. it will take several years worth of gas to make up for the cost of doing the swap. You probably will never break even saving 15 cents per gallon mileage wise.

Sad but true. Either maintain what you have or sell completely and buy something more fuel efficient.

It's not worth the money for a swap. It will take a very long time to recoup your swap amount in gas savings.

Same analogy applies to hybrids and electric cars. The only benefit to those are less emissions.

[upstate240sx]

cadillac 500


super fuel sipper

[markyboi]

best swap? swap cars with a more fuel efficient car


done.

[juls213]

This thread is retarded. The best tip I can give you is get rid of the 240 and get a scooter. They are great in gas.

[Akiros]

Originally Posted by juls213

This thread is retarded. The best tip I can give you is get rid of the 240 and get a scooter. They are great in gas.

quoted fo mothafuckin tr00ph.

[mademedoit]

A turbocharged engine is always more efficient than na, there's a reason seim trucks are turbo. However there's a bigger range in gas mileage do to having bigger injectors. To get better mileage you should also do things like a 1 piece ds and stiffer motor mounts to reduce your drive train loss. Higher gear ratios might help you get better mileage on the freeway but you might have to give it more gas in city driving to get the same acceleration. I noticed a big jump in gas mileage with a manual sr compared to the stock auto ka24de. To answer your question though an ls1 would probably be the best swap for gas mileage.

[flip3d]

SR20DET. I drove from Orlando to Ft Lauderdale going 65 all the way. No boosting, shifting at ~2500RPM. Made it there on a little over a quarter tank. Was definitely over 30MPG.

The time before that I went all out. Boosting whenever I had a chance. Took half a tank. 20ish MPG.

[BigVinnie]

Make the right choice!!!!
VQ swap and get more torque and HP than a stock KA or SR!!!!!!
Hell you can swap a Q45 diff into the s-chassis and get even better gas mileage with a VQ than a KA and SR.... Lots of torque and displacement are your friend.....
VQ is newer technology, higher compression, and overall more efficient do to it's technology. It will also fit into the S-Chassis with the right mounting......

[lazysk8er2]

this thread is pointless.......best idea is to gut the car except for a cluster, shifter and a metal fold out chair welded to the bottom. slam it to the ground so its aerodynamic. get real skinny tires. weigh only 100lbs yourself. take out all the windows and put in plexiglass. get all fiberglass body parts. and drive reallly really slow. also make sure its an s13 cuz it weighs like 100lbs less. but yea def make awesome mileage there. so now you can sell all that stuff you took out and put gas in the car (mid grade). or use the money to convert to veggie oil and go to mcd's and get that shit for free.

[S14DB]

Originally Posted by Sir

wait for it...

Yeah, isn't any swap going to cost more than the gas you save for 5-10yrs?

[upstate240sx]

doesnt the 500 in Cadillac 500 mean it gets 500 miles per gallon





or was that 500 feet per gallon?

[highly responsive]

heh, funny it was said that the best swap is no swap.
the more i have been reading, i can put down more power with my KAE than SR with the right mods. i would also like to not get fucked with when CHP pops my hood (when i go to cali)