improving fuel mileage

[wises4057]

hey guys and gals, I'm wondering what mods can be done that will help improve fuel mileage, ect. I was thinking perhaps an intake pipe, and maybe a slightly larger exhaust with a high flow cat...any ideas or suggestions would be cool. thanks

 

[flying_eagle]

Dont want to be rude but its completly covered in the forums just search it

 

[eeeewidner]

Go back to stock configuration as much as possible. Everything other than that will eventually use more fuel. I.e... 450 cc inj. 13b turbo, 2 1/4 exhaust.

 

[gstryyder]

2 posts up...^^^Forum rules say if your gonna just have a lame @$$ remark like that don't bother littering the forums.

As for upping your gas mileage. Just do some mods to make it breathe a bit better. k&n filter would be a good start. One thing that is always a good idea is to replace your fuel filter if you can't remember the last time it was replaced. Run some sea-foam thru it.. Keep your foot off the gas. LoL

 

[Mr Peepers]

Driving technique will make the largest difference with a well running car. Shift so the revs fall to about 2k after each shift and be easy on the gas; boost is out of the question. Basic maintenance and things to reduce pumping losses such as less intake/exhaust restriction as the basics.

Our cars aren't exactly made for gas mileage but I like to be efficient when I can, and have fun when I can

 

[DSMsamurai666]

A screamin' demon coil pack might improve fuel efficiency. It powers the spark plugs with more voltage so the gas in the cylinders is burned more fully.

 

[toofast82]

A good running manual car should get pretty decent mileage. But just let it breathe and obviously make sure maintenance is up to date.
If your auto, youre not really gonna get good mileage anything you do unless youre on the highway

 

[tkelly27]

No gas mileage to be had in new coils.

All the proper maintenance like plugs, fuel filter, making sure you're not getting any boost leaks will get you some mileage. Then your right foot must be modified. Then your tune can be modified.

Using load based tuning with DSMap I can barely drive my car it's so lean on the highway, but when I punch it I get full power. I guess DSMlink does load based tuning now too, but if you wanted to stick with the MAF you can modify your own binaries.

 

[DSM1G90]

I'm just a stock turbo with a B16G, 450's with no intake (using FRAM air filters in a uncut aircan-not into K&N due to they don't clean the air as a good stock one does-don't want to do a valve job anytime soon. Plus, true they let in more air, but that tells the ECU to add more fuel...kinda of a 'defeating the purpose' if one wants to have higher mpgs...), exhaust, engine management mods whatsoever, and I can muster 29mpg if I behave on the freeway. Wintertime is bad for me due to the cold, so I drop to 24mpg during this time.

One hit the shiftpoints below 3k at a respectable throttle (don't slam on the throttle for that really wastes the fuel) between shifts, keep tires (stock 205's) inflated at 35lbs and keeping speed limit - no "hotdogging" trying to beat that ricer wannabe Honda that passed you...

..and keep the thing tuned with proper oil weight in the pan.

Some dude on another MPG site that has the same turbo plymouth that I have, is claiming he's getting over 40mpg. But, he's cheating a bit: Inflating tires up to 50lbs, had Jacks Transmissions do a tranny rebuild and had that 5th gear mod to really drop the revs in that gear, rows through the gears real slow and easy, and he hardly ever goes over 65mph on any road that he travels..

-DSM

 

[knochgoon24]

Look at getting a tuning device to lean out the car a bit.

 

[wises4057]

yah, I have the fuel filter done. just looking at freeing up some power and fuel mileage by doing some simple things...I don't know if I wanna do an exhaust, because I really don't plan on modding the car and wanna keep the stock sound. but other then doing an intake pipe, wasn't sure what other simple mods would help...think hard inner cooler pipes would help?

 

[wises4057]

oh, and this is on my completely stock 1997 gst spyder 5-speed, not my awd that's listed in my profile. just thought I'd mention that.

 

[ndsti]

My car (the one in my profile) gets 27-28 mpg on the highway, driving conservative. Every car is different but like every one else is saying preventive maintenance is the best way to get good mileage!

What are you getting for mileage now?

 

[mindset]

I always like to put it in neutral down big hills or just anywhere I can put it in neutral and have a constant cruising speed.
I remember when I used to drive my buddy's VW, it had a display screen and it told you the average MPG, and every time I went down a hill in neutral it would soar up.

 

[joyfil2001]

I have an auto TSi and I have a heavy foot. I get 21mpg on 650cc injectors. If I ease up on the throttle I can get 25mpg. It's mostly how you drive.

 

[2FoX2]

One of the best ways to get better mileage is to use the cruise control whenever possible, cruise control will only open the throttle as much as needed to maintain speed, as opposed to our feet which will vary the throttle.

 

[joyfil2001]

One of the best ways to get better mileage is to use the cruise control whenever possible, cruise control will only open the throttle as much as needed to maintain speed, as opposed to our feet which will vary the throttle.

The theory behind that is correct. However, it is not true. Using cruise control will decrease your MPG. Try it on your GSX and see how many times cruise control throws your car into boost. The best way is to drive the car manually and watch your foot.

 

[2FoX2]

OK, with the exception of using cruise control when climbing mountains, but who would do that anyways. On a level or near level surface it is far more efficient than using your foot.

 

[joyfil2001]

OK, with the exception of using cruise control when climbing mountains, but who would do that anyways. On a level or near level surface it is far more efficient than using your foot.

I live in NJ. Is that flat enough? I thought the same thing when I first got the car. I would turn the cruise on during my morning commute on the GSP. It sucked more gas than ever. It was constantly having to correct itself.

 

[Spades]

Taller tires, and make sure they're aligned and properly inflated

 

[2FoX2]

It was constantly having to correct itself.

In which case there may be something wrong with your stepper motor, the adjustments it makes should be gradual and consistent, rarely having to open the throttle plate enough to induce boost unless the speed falls below 5mph of the target range.
In any case, for the most part it's a useful tactic to improve upon the largest factor in fuel economy which is the driver.

 

[DSM1G90]

Interesting on the cruise thing: I drive freeways a lot and when I pop my car into cruise, it's interesting how the boost gauge will fluctuate in needing to keep the motor at the set RPM's-even on flat ground freeways.

Yet, when I don't use cruise, I can maintain better steady boost gauge readings with throttle variations.

DSM

 

[joyfil2001]

In which case there may be something wrong with your stepper motor, the adjustments it makes should be gradual and consistent, rarely having to open the throttle plate enough to induce boost unless the speed falls below 5mph of the target range.
In any case, for the most part it's a useful tactic to improve upon the largest factor in fuel economy which is the driver.

Interesting on the cruise thing: I drive freeways a lot and when I pop my car into cruise, it's interesting how the boost gauge will fluctuate in needing to keep the motor at the set RPM's-even on flat ground freeways.

Yet, when I don't use cruise, I can maintain better steady boost gauge readings with throttle variations.

DSM

/\ This. There is nothing wrong with my stepper motor. Same crap happens in my 2005 Jeep Cherokee.