Hi [ Archive] - GasSavers.org - Helping You Save at the Pump

I found this forum off of a google search. Would like to learn to increase the fuel mileage of my 1990 2.5L Plymoth Sundance. This place seems like a good place to start.

Joel

Well, start of by telling us a little bit about the car and yourself! Done anything or got any ideas? We're here to help, :)

Cool how this forum is "crawled" by google. *hellz yeua*

Welcome Joel!

~Will

Cool how this forum is "crawled" by google. *hellz yeua*

Welcome Joel!

~Will

Now that the site is faster we should be getting higher rankings too.. might take a few months though.

If you really want to increase the page ranking we can initiate a google-bomb compaign, which could be a lot of fun.

Oh, and welcome JOEL!

Wasn't I the one that told you about google-bombing!?

Wasn't I the one that told you about google-bombing!?

Yep... I have a friend who used to work in SEO (Search Engine Optimization) as a job. We've been talking abotu ways to increase page ranking lately.

Do it, manG.

We're kicking *** on the superMID front, :p

Welcome Joel. Finally we get a Plymouth on here! So, start out with the basics on the info -- 2-door,Turbo, Manual, Modifications? Also check out the DIY section of the Forum area to get some ideas. Since your car is older, the liklihood of getting it to perform how you want will be easier (OBD-I vs. OBD-II). Always remember, we're here to help, and if you have any questions, don't hesitate to ask.

RH77 (Rick)

It is a 1990 Plymoth Sundance 4dr 2.5L (non turbo) 3 or 4 speed auto. Have had it since last fall. Only has 122, 000 km's approx. on it. Have had to replace/fix: brake lines, couple of dents, soon some underbody work, water valve & swap parts due to rust. Have gotten 30mpg average with it. Would like to push it further. Kinda wish it was carberated, would give better milage. From Canada. The car seemed good, but after someone else looked at it, they found problems. Have basically paid for the car plus on fixes.

Joel

What makes you say carbing would give better mileage?

What makes you say carbing would give better mileage?

Agreed. My experience has shown that carbs always run richer and without an o2 sensor it cannot be properly leaned out.

What I have been told by my mechanic is that there is not a lot that could be done to increase gas mileage. Can't modify a fuel injection too much it seems. Mabye I am wrong. Considering what people are saying on this forum. This person has an older jeep. Has a 4.0 L I believe, fully carberated and can go upwards of 800-1000km. A carberator can be modified a bit more. Have him right now thinking about what could be done to get more gas miliage on the Sundance.

Joel

The reason the carb can be modified so much is because it's so inefficient to begin with. The fact that the fuel injection itself can't take heavy modification is because it's just about as good as it gets in terms of getting the fuel in there. Carbs have issues with puddling and flow design and bad mixing and all that, while FI is precise and has a whole host of electronics to make sure it stays that way.

The reason the carb can be modified so much is because it's so inefficient to begin with. The fact that the fuel injection itself can't take heavy modification is because it's just about as good as it gets in terms of getting the fuel in there. Carbs have issues with puddling and flow design and bad mixing and all that, while FI is precise and has a whole host of electronics to make sure it stays that way.

I agree -- electronic controls and fuel injection have improved gas mileage over the last 20+ years. There are ways to alter the ECU of the car for fuel economy that would probably be cheaper than carb-ing. I'm afraid that post-carbueration, L/km will go up. 30 mpg is a great starting point -- find out if anything in the system is malfuntioning. Is the check-engine light on? Then find out how your car "thinks". Does it like hot intake air, or a hotter thermostat for FE? If you usually travel at 100 km/h or greater, then perhaps aerodynamics mods could be the answer or a slower cruise speed...

RH77

andres, you are not wrong, just misinformed. the jeep can go the distance because of the tank. your mechanic is probably just missing 'the good old days' fuel injection beats out carbeuration if all other variables are equal, every time, especially for fuel economy.

Everything has been checked over. Everything appears to be in check. Will be getting fuel injector cleaner within next couple of days, mabye get spark plug wires changed soon. That should make a difference. If there was something I could attach that would increase aerodynamics of car that would be just as good. 30mpg is a good start, but..........with gas prices where they are would like to get further in all possible cases.

Joel

for aerodynamics, here is a good universal upgrade for anyone:

http://www.gassavers.org/forum_topic/belly_pan_installation_honda_del_sol.html

browse through the threads, there really is a wealth of informations on this site. like warm air intakes, which destroy your power but give a healthy boost to fuel economy.

the best place to begin is in understanding theory...