DSM gets 9mpg...
 

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

Re: DSM gets 9mpg...
 

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.

Re: DSM gets 9mpg...
 

-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!!!!

Re: DSM gets 9mpg...
 

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

Re: DSM gets 9mpg...
 

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.

Re: DSM gets 9mpg...
 

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

Re: DSM gets 9mpg...
 

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.

Re: DSM gets 9mpg...
 

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.

Re: DSM gets 9mpg...
 

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.

Re: DSM gets 9mpg...
 

My FWD averaged 24 city/hwy and 31 hwy.

Re: DSM gets 9mpg...
 

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.

Re: DSM gets 9mpg...
 

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.

Re: DSM gets 9mpg...
 

how was my post a tech lesson?

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

Re: DSM gets 9mpg...
 

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

Re: DSM gets 9mpg...
 

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

Re: DSM gets 9mpg...
 

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....

Re: DSM gets 9mpg...
 

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 :eek: 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. :(