DSM gets 9mpg...

CarPsyco84 · 11-15-2005

Course it snowed, and it couldn't possably be cause of the way it was driven....

dsm10sec · 11-15-2005

Maybe your fuel pressure regulator is being overrun? I know that mine over runs because I can see it in the knock, when the engine is cold. If I drive around like that the car runs like crap, and I could waste 1/4 of a tank just going 20 miles.

CarPsyco84 · 11-17-2005

Quote:

Originally Posted by dsm10sec

Maybe your fuel pressure regulator is being overrun? I know that mine over runs because I can see it in the knock, when the engine is cold. If I drive around like that the car runs like crap, and I could waste 1/4 of a tank just going 20 miles.

-Haha, no, the only thing wrong with it was the driver had excessive use of the gas pedal, the car will get 22mpg if im nice to it.... doesn't matter anywase, in less than 100 miles of it being together its now broken AGAIN!!!!

awd-drifter · 11-17-2005

do you guys know how many miles the average dsm gets in a full tank hopefully without heavy throttle?

**JET** · 11-17-2005

Usually 23-25 on the highway is average for an AWD. Highest I have seen was Nash with 32 mpg on the way to the SO a few years ago.

AJ · 11-17-2005

I thought Nash averaged more than 32. I thought during 1 tank he was hitting 39 as an average. I could be wrong though.

Steeltwo · 11-17-2005

my dsm got around that when I had the stock ECU

with a eprom and a keydriver stage 3

its in the low 20's and on the highway it is in the mid 30's.

**JET** · 11-17-2005

Quote:

Originally Posted by Steeltwo

its in the low 20's and on the highway it is in the mid 30's.

Sorry man, you aren't going to see a 12 mpg difference in gas mileage. The mid 30's must have been on a short fill or your tires are a different size or something.

Pimpin Dsmstyle · 11-17-2005

I check my mpg every single time I fill up and my old FWD would get over 30 anytime it was hwy driven and it would get low 20's in the city. It was in the neighborhood of 10 mpg difference.

The awd got 19 mpg religiously in the city. 23-24 on the hwy.

**Kracka** · 11-17-2005

My FWD averaged 24 city/hwy and 31 hwy.

Steeltwo · 11-17-2005

Quote:

Originally Posted by JET

Sorry man, you aren't going to see a 12 mpg difference in gas mileage. The mid 30's must have been on a short fill or your tires are a different size or something.

closed loop seems to be the culpurt to the change in gas mileage according to the keydriver guy.

i thought he accidently burned the chip to lean, but after he looked at the log, he said closed loop was causing the increase in mileage.

**JET** · 11-17-2005

Quote:

Originally Posted by Steeltwo

closed loop seems to be the culpurt to the change in gas mileage according to the keydriver guy.

i thought he accidently burned the chip to lean, but after he looked at the log, he said closed loop was causing the increase in mileage.

I don't need a tech 101 lesson. For a DSM to go in closed loop it needs to be at a fairly constant speed, engine RPM and no drastic TPS changes. All DSM's should be running at closed loop on the highway, so there isn't anything special about yours. If you truely are getting mid 30's for gas mileage, you had better have an EGT. You are very lean. On a FWD it is doable because of the taller gearing, lighter weight, and less drivetrain loss.

Steeltwo · 11-18-2005

Quote:

Originally Posted by JET

I don't need a tech 101 lesson. For a DSM to go in closed loop it needs to be at a fairly constant speed, engine RPM and no drastic TPS changes. All DSM's should be running at closed loop on the highway, so there isn't anything special about yours. If you truely are getting mid 30's for gas mileage, you had better have an EGT. You are very lean. On a FWD it is doable because of the taller gearing, lighter weight, and less drivetrain loss.

how was my post a tech lesson?

i know jack shit about these cars. I was just posting what the keydriver guy told me.

Steeltwo · 11-18-2005

and(now) i'll be getting a egt this spring

**Kracka** · 11-18-2005

Quote:

Originally Posted by Steeltwo

and(now) i'll be getting a egt this spring

Get a good probe such as the GReddy or TRE, the Autometer probe is very slow to respond.

CarPsyco84 · 11-19-2005

yeah, if you get off the hiway, and you've been nice to your car, and your exhaust manifold glows like a champ, that would be your first clue....

turbo2086 · 11-19-2005

I get about 16 MPG city driving. I used to get a little, more even after the EGR block off, and emission removal. I been studying my data logger, and notice that I do not get any O2 readings until about 2-2500rpm. I even tried a new O2 sensor, and that hasn't changed. I'm guessing the voltage supply for the warmer has failed somewhere. Someone told me without O2 readings at idle, its maxing out my fuel trim

So once I get a warmer day (40ish) I'm going to go around and try to figure it out. Cause its sucks to have to let your cars stay at idle for so long to warm up.