What do we know about the STi and its fuel consumption? - Page 5

***wdb*** · 09-15-2005, 11:55 AM

Quote:

Originally Posted by RexMan

Well, this experiment actually hurt gas mileage in the long run.

I was very disciplined and shifted at 2500 when I could and ended up getting 16 mpg. That's about 4-5 mpg less than I usually get at shifting at 3500-4000 rpm.

I think it was because I had to use the boost more than usual at low rpm.

So...shifting at 3500-3750 rpm looks to be the sweet spot.

Wow, real world testing. Cool. Thanks for doing it and thanks for sharing the results.

sebtarta · 09-16-2005, 04:19 AM

Well I am new here. I bought my STi 05 Silver a month ago. I must say that going from an 01 RS fully loaded to this is a different road.

Back to the post, for the break in period, I kept my self very constant at changing gear at 3k RPM, specifically as the manual stated. My milage was not that great I was doing about 260 Miles per tank - which is about 17 mpg.

Once I broke the 1000 miles, i went out and took the air silencer off. And this was a big difference. Keeping the same driving as before for a full week, just going to work only, where I do 64 miles back and forth. I only do 24 miles highway and then 8 miles back roads, and not going more than 75mph I managed to do about 330 miles per tank. Which is 22-24mpg, wich is a big difference.

Performance - none really, car is still all stock. Only change is the BOV music once you remove the silencer out.

I really do not know

, if it is that as the car gets broken in more and more, the engine starts to work better. So maybe that could be the reason for such a jump in fuel efficiency.

Later,

Gami004pilot · 09-16-2005, 09:56 AM

Sebtarta? Removeing the silencer from the BOV, can this cause any problems? Where is this silencer located? Any pics?...

Donmei? Can our Sti's get a custom tune with out buying an EM system like the Cobb Access Port and still get added power? Are you also saying that getting EM like the AP will not only get us more power but also better gas mileage?

wundej · 09-16-2005, 02:26 PM

Quote:

Originally Posted by Gami004pilot

Sebtarta? Removeing the silencer from the BOV, can this cause any problems? Where is this silencer located? Any pics?...

Donmei? Can our Sti's get a custom tune with out buying an EM system like the Cobb Access Port and still get added power? Are you also saying that getting EM like the AP will not only get us more power but also better gas mileage?

I believe Sebtarta is refering to removing the intake silencer, many people do this. I have a feeling his change in mileage is related to having the car completely broken in. Here is a link to the mod. More of a *sound* mod, but it's free

You need to pay someone to get any type of a tune. They come in the form of

piggyback ecu (still uses stock ecu, just modifies certain signals coming into it, basically tricks the ecu)
reflash (modifies the code in the ecu, setting different fuel/timing maps, etc)
stand alone (whole new management system for your engine)

Accessport is probably one of the most popular methods, but you won't really get a custom tune from it. You would need to upgrade to the street tuner software that lets you modify the AP maps and fine tune for your setup. The AP is nice b/c you can do it yourself, the base AP can be used by anyone.

Read up on the different EM systems in the ECU Tuning & Performance Electronics forum

A tune will allow you to run leaner in certain situations where you are not at risk of harming your engine, while still giving the car the fuel it needs under heavy load/boost.

***VSGTS14*** · 09-16-2005, 02:37 PM

man i get like 15 mpg
i do like 200-220 a tank

lol
when i was stock, i saw mostly 220+ only because i don't think i was on it as much.

TaoKane · 09-16-2005, 04:01 PM

I went from 17mpg to 24.5 using this:

http://www.scangauge.com/

It's literally paid for itself and then some. I drive 35 miles a day, as I drive I can see how my actions (shifting, accelerating, turning, AC, windows) are directly impacting the MPG's, and so, through trial and error, I've learned to drive in a manner which gives me the best milage given the conditions.

On a side note, all the other capabilities of this little device are incredibly usefull, the only down side is how gangly and ugly the box is, so I took a dremmel to it and installed it where the clock goes. It looks awsome, I wish I knew how to post pictures, I would show you guys.

donmei · 09-16-2005, 11:18 PM

tao,
Thats a neat device, and well worth what they seem to be asking.

But most people already have a "fuel economy gauge". In the '70s durring the fuel crisis, vacume gauges were all the rage. The idea was to keep the car running as muc vacume as possible.

Well, thats exactly what our boost gauge is. With my passat I was able to drive almost all the way to work and never exceed 5 in-hg of vacume. In other words it was possible to use the boost gauge as a fuel economy gauge. When you're in the boost, you're using fuel.

I didn't do it often, but when I was driving in traffic, it almost became a game to see how little manifold pressure I could use. It made me a better driver because if forced me to anticipate what traffic was doing and anticipate power needs well in advance. It also forced me to look as far down the road as I could see to help with anticipation.

I personally like having a needle for something like that rather than a digital readout. But for $129 that things a steal.

Don

***wdb*** · 09-17-2005, 07:21 AM

Quote:

Originally Posted by wundej

Accessport is probably one of the most popular methods, but you won't really get a custom tune from it. You would need to upgrade to the street tuner software that lets you modify the AP maps and fine tune for your setup. The AP is nice b/c you can do it yourself, the base AP can be used by anyone.

Also there is the ProTuner package, through which professional tuners can custom tune your car and provide you with a map that can then be loaded/stored via the AP.

***wdb*** · 09-17-2005, 07:31 AM

Quote:

Originally Posted by donmei

tao,
Thats a neat device, and well worth what they seem to be asking.

Agreed. Finally, someone asking a reasonable price for an automotive electronic gizmo. It basically appears to be an ECU signal interpreter, and as ECU's have become more and more standardized a tool like that one became more and more practical. I wish it had a bigger display though.

Quote:

But most people already have a "fuel economy gauge". In the '70s durring the fuel crisis, vacume gauges were all the rage. The idea was to keep the car running as muc vacume as possible.

Well, thats exactly what our boost gauge is.

Funny you should mention it. Since I started this whole fuel mileage thing I've been paying more attention to my boost gauge during 'normal' (read: not going like a bat out of h*ll) driving. In particular I've been playing around with keeping the pressure under zero. Very handy, and one more thing to keep my from going bonkers while following the soccer moms in their SUVs.

donmei · 09-17-2005, 09:45 AM

wdb,
that was the whole purpose of the OBD II standard. Standardized data formats for specific items that the govenrment considered necessary to diagnose problems with anything that could affect exhaust emissions. Prior to OBD II (and OBD I) everyone used their own proprietary data format.

Brand specific scanners can get down to items outside of the OBD II standards, like setting door locks, radio, alarm parameters. On a VW there are an amazing number of things you can tweak with these devices. Right down to how the auto trans shifts.

Don

ravent · 09-17-2005, 01:54 PM

Every time you add something to the "intake" the car needs to be reflashed because the factory ECU can not deal with it properly...at least I think this is true

Christian. · 09-20-2005, 04:31 PM

christian@cobbtuning.com about an economy map for their STi will get something to look at...and test.

racephysics · 09-21-2005, 08:24 PM

i doubt i'll be the first to email you, but i'll try.

yeah, i have about 1500 on mine and get 18 mpg.
i've read elsewhere mod'n the fuel maps will not only get you hp, but get you a little more mpg; a win in both cases IMO.

TampaSTI · 09-22-2005, 03:53 AM

Quote:

Originally Posted by TaoKane

I went from 17mpg to 24.5 using this:
http://www.scangauge.com/
.

How about the ecutek dash http://ecutek.com/products/dashdisplay/

donmei · 09-22-2005, 06:26 AM

If you just want real time monitoring of manifold pressure, a $50 boost gauge/pod combination is all you need. For use while driving, I like a needle because its movement can be picked up in your peripheral vision.

If I'm looking for exact data, digital is the way to go. each has its place

09-16-2005, 09:56 AM	#63
Gami004pilot Senior STI Driver Car: 05 WRX STI Fav Mod: Just having an STI is good enough. Location: Central Florida Posts: 365 Join Date: Jul 2005 Trader Rating: (0)	Sebtarta? Removeing the silencer from the BOV, can this cause any problems? Where is this silencer located? Any pics?... Donmei? Can our Sti's get a custom tune with out buying an EM system like the Cobb Access Port and still get added power? Are you also saying that getting EM like the AP will not only get us more power but also better gas mileage? Last edited by Gami004pilot : 09-16-2005 at 10:03 AM.

09-16-2005, 04:01 PM	#66
TaoKane STI Driver Car: 05 blue/gold Fav Mod: bone stock Location: Medfah Mass Posts: 211 Join Date: Apr 2003 Trader Rating: (0)	I went from 17mpg to 24.5 using this I went from 17mpg to 24.5 using this: http://www.scangauge.com/ It's literally paid for itself and then some. I drive 35 miles a day, as I drive I can see how my actions (shifting, accelerating, turning, AC, windows) are directly impacting the MPG's, and so, through trial and error, I've learned to drive in a manner which gives me the best milage given the conditions. On a side note, all the other capabilities of this little device are incredibly usefull, the only down side is how gangly and ugly the box is, so I took a dremmel to it and installed it where the clock goes. It looks awsome, I wish I knew how to post pictures, I would show you guys.

09-20-2005, 04:31 PM	#72
Christian. STI Driver Car: 01 Subaru WRX STi Sp Fav Mod: Coming Soon Posts: 262 Join Date: Aug 2005 Trader Rating: (0)	The first to e-mail me @ christian@cobbtuning.com about an economy map for their STi will get something to look at...and test.

09-22-2005, 06:26 AM	#75
donmei S204 Racer Car: 04 WRB STi Fav Mod: Trailer Hitch Location: CT, U.S.A. Posts: 3,139 Join Date: Feb 2004 Trader Rating: (0)	If you just want real time monitoring of manifold pressure, a $50 boost gauge/pod combination is all you need. For use while driving, I like a needle because its movement can be picked up in your peripheral vision. If I'm looking for exact data, digital is the way to go. each has its place This ad is not endorsed by this member. Please register or login to hide this ad.

09-16-2005, 04:19 AM	#62
sebtarta Spec C Club Car: Waiting for the STI Fav Mod: Driving My Car Location: I Don't Know Posts: 1,661 Join Date: Sep 2005 Trader Rating: (7)	Well I am new here. I bought my STi 05 Silver a month ago. I must say that going from an 01 RS fully loaded to this is a different road. Back to the post, for the break in period, I kept my self very constant at changing gear at 3k RPM, specifically as the manual stated. My milage was not that great I was doing about 260 Miles per tank - which is about 17 mpg. Once I broke the 1000 miles, i went out and took the air silencer off. And this was a big difference. Keeping the same driving as before for a full week, just going to work only, where I do 64 miles back and forth. I only do 24 miles highway and then 8 miles back roads, and not going more than 75mph I managed to do about 330 miles per tank. Which is 22-24mpg, wich is a big difference. Performance - none really, car is still all stock. Only change is the BOV music once you remove the silencer out. I really do not know , if it is that as the car gets broken in more and more, the engine starts to work better. So maybe that could be the reason for such a jump in fuel efficiency. Later,

09-16-2005, 02:37 PM	#65
*VSGTS14* Muller Chevrolet Car: 08 Chevy 2500HD Fav Mod: a new 08 STi Location: Milford, NJ Posts: 9,981 Join Date: Oct 2004 Trader Rating: (11)	man i get like 15 mpg i do like 200-220 a tank lol when i was stock, i saw mostly 220+ only because i don't think i was on it as much.

09-16-2005, 11:18 PM	#67
donmei S204 Racer Car: 04 WRB STi Fav Mod: Trailer Hitch Location: CT, U.S.A. Posts: 3,139 Join Date: Feb 2004 Trader Rating: (0)	tao, Thats a neat device, and well worth what they seem to be asking. But most people already have a "fuel economy gauge". In the '70s durring the fuel crisis, vacume gauges were all the rage. The idea was to keep the car running as muc vacume as possible. Well, thats exactly what our boost gauge is. With my passat I was able to drive almost all the way to work and never exceed 5 in-hg of vacume. In other words it was possible to use the boost gauge as a fuel economy gauge. When you're in the boost, you're using fuel. I didn't do it often, but when I was driving in traffic, it almost became a game to see how little manifold pressure I could use. It made me a better driver because if forced me to anticipate what traffic was doing and anticipate power needs well in advance. It also forced me to look as far down the road as I could see to help with anticipation. I personally like having a needle for something like that rather than a digital readout. But for $129 that things a steal. Don

09-17-2005, 09:45 AM	#70
donmei S204 Racer Car: 04 WRB STi Fav Mod: Trailer Hitch Location: CT, U.S.A. Posts: 3,139 Join Date: Feb 2004 Trader Rating: (0)	wdb, that was the whole purpose of the OBD II standard. Standardized data formats for specific items that the govenrment considered necessary to diagnose problems with anything that could affect exhaust emissions. Prior to OBD II (and OBD I) everyone used their own proprietary data format. Brand specific scanners can get down to items outside of the OBD II standards, like setting door locks, radio, alarm parameters. On a VW there are an amazing number of things you can tweak with these devices. Right down to how the auto trans shifts. Don

09-17-2005, 01:54 PM	#71
ravent Amateur STI Driver Car: 97,98,00 Subaru Impr Fav Mod: STi Seats, engine mounts, door sills;) Location: NorCal Posts: 14 Join Date: Aug 2005 Trader Rating: (0)	Every time you add something to the "intake" the car needs to be reflashed because the factory ECU can not deal with it properly...at least I think this is true

09-21-2005, 08:24 PM	#73
racephysics Junior STI Driver Car: 05 Darth STi Fav Mod: Vishnu v370 Location: Memfiz (GammaWorld) Posts: 129 Join Date: Jun 2005 Trader Rating: (0)	i doubt i'll be the first to email you, but i'll try. yeah, i have about 1500 on mine and get 18 mpg. i've read elsewhere mod'n the fuel maps will not only get you hp, but get you a little more mpg; a win in both cases IMO.