Project 40MPG TSi

[KGB Pilot125]

Anyone think its possible? I have never driven a turbo FWD before but I have a spare 93 2.0 FWD just sitting on the side of the house. Its in great shape both inside and out only problem is it broke a timing belt I picked it up for 500 bucks to rip out the intierior and the wiperless wing for my 91 AWD but now that I gave it to my sister for a winter beater I am kinda missing working on a DSM. This might be a total waste of time but I get paid .485 cents a mile for work and drive close to 40k miles a year. If this can get close to 40 that would be twice as good as my 4runner. EPA estimates the 93 gets 26 but they also esimate my AWD gets 26 so something isnt right. I have recorded a best of 30.4 in my AWD and an average over 3 months of 27. this is all with no tunning tools. and on the dyno the AF never went above 11.1

Thoughts, critisism, praise?

 

[kenamond]

I don't really have anything to contribute, but I've always wondered why newer cars are more efficient. If you are successful, I'll be interested to see what worked and why.

I suspect that you'd have a lot of trial and error without dedicated dyno access. I worked at an engine research center one summer, and one guy there was working on a Saturn 4-banger. He built his own ECU, added pressure sensors to the heads, yadda yadda. He jacked the fuel economy up several mpg, reduced emissions (the facility had emissions analysis capability), and also got it to run dual-fuel mode: gasoline and natural gas. Flip a switch on the fly, puff of black smoke, good to go. But he had a big brain, dedicated flowbench, water brake dyno, emissions facility, etc. with the motor on a stand.

 

[19Eclipse90]

I don't know. 40mpg in a turbo car will be extremely tough. My best with my car is 33mpg. You will need to free up the exhaust for sure. Good luck with that.

 

[roadrunner2176]

40 mpg might be a stretch, possible,just don't boost. Only problem with that is your have a turbo, use it. I would say absolutely possible with a non turbo 4g63.

If your seeing the same mpg for fwd and awd look somewhere else, or look to see that your not seeing an auto fwd vs a manual awd.

 

[h8r]

I have logged 37.5 in my stock turbo..stock injector 99 gst... This was done on mixed driving.. NEVER getting into boost... I have 3 inch from turbo back, no cat, extreme psi intake, hard icp, greddy type S, and some rota slip streams.. (light wheels)..

 

[blackGSX2g]

If this is just for highway cruising, you could try playing with your final drive gear ratio.

 

[GofaST4life]

blackGSX2g beat me to the punch, changing the gearing would def be a big help, esp with MPG, you may lose some power but thats not your goal...

good luck

 

[bling5tatus]

I have heard about people using "lean burn" eprom binaries.

 

[khartley]

I used to have a 94 GS with intake and exhaust...I think the best I got with it was still around 35. It'll be tough, you're going to really have to stay out of boost to even come close to 40.

 

[KGB Pilot125]

the car is a NA 2.0 I am going to add a turbo due to the fact I live at 6000 feet above sea level and have to drive over 3 passes in my route that are over 10k feet.

The car is probably pretty light all manual windows/doors, no sunroof, FWD. Here is what I either have laying around or am going to by

6bolt stock build
cyclone intake for more lower end dont have to rev so much
small 16
DSM link
450 inj
custom 3 inch exhaust
nice ported exhaust
decent side mount or small FMIC
lots of tuning (have seen some info on the lean burn stuff)

 

[TAndrus]

How are some of you getting 30mpg? I average 16mpg. Help!

 

[stockfornow]

Keep us posted. I'm kind of interested!!!

 

[stockfornow]

How are some of you getting 30mpg? I average 16mpg. Help!

Big turbo, and don't boost, and some really good tuning. That would be my best guess

 

[95CarbonEclipse]

How are some of you getting 30mpg? I average 16mpg. Help!

No kidding! My Yukon gets better gas mileage then my DSM does. Of course, it doesn't help that I drive her like a 18 year old nymph!

 

[TAndrus]

No kidding! My Yukon gets better gas mileage then my DSM does. Of course, it doesn't help that I drive her like a 18 year old nymph!

I don't even ride mine that often. Maybe 3 times a week. The cost of gas is killing me.

 

[Mr Peepers]

Pneumo did a great write up on saving gas and driving style:
http://www.dsmtuners.com/forums/showthread.php?t=254223

 

[kenamond]

I don't even ride mine that often. Maybe 3 times a week. The cost of gas is killing me.

When's the last time you did a boost leak test?

 

[hubz91talontsi]

wow i need some help in this subject i only get about 15mpg..someone pm me with some advise =D thanks a million

 

[92dsmtalon]

Hell, Im only getting 19MPG, but I drive mine just like 95CarbonEclipse said he drives his, haha.

 

[TAndrus]

When's the last time you did a boost leak test?

Never have. I bought it back about a month ago. I guess I better do one. How to I repair leaks if I find one?

 

[19Eclipse90]

Never have. I bought it back about a month ago. I guess I better do one. How to I repair leaks if I find one?

Depends on where you find one at.

 

[T9S1i]

To the OP...

PM "Pneumo" on here, he has a D/D laser rs-t and gets a rediculous mpg... i think something like 50 or so... he has many tips and techniques and im sure he can help you with all you need to know to get great mpg outta that car.


Edit*... MR. peepers beat me to it! Good find, i was just looking for dave's article.

 

[notsofastdsm55]

like someone earlier on this thread said the eprom "lean burn code" it leans out your cruize afr to something like 16:1 afr but forget ever passing emissions!!! the nox levels go threw the roof when you're that lean. I heard the people get low to mid 30's as far as mpg goes!!!

 

[emoguitarboy]

I know you use more gas under boost, I wonder if there would be a way to get a BOV to open at 0PSI so you don't boost =\

I'd say probably the most free flowing intake & exhaust you can get.

 

[tkelly27]

I know you use more gas under boost, I wonder if there would be a way to get a BOV to open at 0PSI so you don't boost =\

I'd say probably the most free flowing intake & exhaust you can get.

Just unhook your wastegate arm. You'll make 1-2psi max. Poor mileage on a good running car is more of a right foot problem than a mechanical situation though.