EVO X - Gas Mileage?
You'd be surprised how much of a difference 500RPM drop will make. I know it's a poor comparison but, the 5th gear in my civic was very short with a 4.7 final drive and when I added a 6th gear from a TSX and used the 4.3 final drive ring from a base RSX, I dropped 1500 RPM at cruising speed and was able to achieve 35+mpg with over 400WHP on tap.
Keep in mind, yes my civic weighs under 2800lbs with me in it and it is front wheel drive, but I have faith that with the offerings Sheptrans has, I can change my 21-22 & 24-26 to in the ballpark of 24-26 and 27-29mpg with the Evo.
I also plan on getting some 17" wheels that will clear the calipers, I tried to test fit my 17" RPF1's but the offset (+45) was too high and the inner wheel wouldn't clear. I believe a lower offset 17" wheel is possible to further help economy and keep the quick acceleration of the car.
Maybe with a tune I might just be able to break 30mpg, we'll see. I know this is a rally car for the road but you CAN have power and economy, you just have to figure out what works.
Keep in mind, yes my civic weighs under 2800lbs with me in it and it is front wheel drive, but I have faith that with the offerings Sheptrans has, I can change my 21-22 & 24-26 to in the ballpark of 24-26 and 27-29mpg with the Evo.
I also plan on getting some 17" wheels that will clear the calipers, I tried to test fit my 17" RPF1's but the offset (+45) was too high and the inner wheel wouldn't clear. I believe a lower offset 17" wheel is possible to further help economy and keep the quick acceleration of the car.
Maybe with a tune I might just be able to break 30mpg, we'll see. I know this is a rally car for the road but you CAN have power and economy, you just have to figure out what works.
that said, looking forward to seeing your progress on the build!
Evolving Member
Joined: Apr 2009
Posts: 190
Likes: 4
From: Chesapeake, Virginia
The tuner before him apparently only changed the WOT parts of the maps, and didn't lean out the mixture at all, so that fool actually cost me 1mpg.
I'm confused - as far as cruising, shouldn't it target stoich? I see partial throttle part boost to run a little leaner than it should, but you won't really be picking up any significant mpg from that. or did he tune leaner than stoich for cruising?
Evolving Member
Joined: Apr 2009
Posts: 190
Likes: 4
From: Chesapeake, Virginia
Yes, and I don't think Mitsubishi did that.
I think Mitsubishi prioritized the safety of the engine, and made the Evo X run rich at nearly all parts of the fuel map. I bet you don't even have to lean it all the way to stoichiometric to see an improvement in throttle response and gas mileage.
I remember when I had my car for a couple of months, and gas prices climbed over $4.00/gal, Works started offering their "Brain Flash Eco" to save Evo owners some gas.
http://store.worksmotorsports.com/WO..._p/107.102.htm
I thought it was evidence that Mitsubishi half-assed the factory software. They probably figured "Everyone is going to hack it, anyway. How much effort should we really put into it?"
I think their marketing targeted drivers who would be trading in gutless small-bore cars with weak throttle response, and a lot of Evo owners would be telling each other "You don't buy these cars for gas mileage." So they tuned it well enough to impress the target demographic on the test drive, and made sure it would never, ever run lean on stock software.
I think Mitsubishi prioritized the safety of the engine, and made the Evo X run rich at nearly all parts of the fuel map. I bet you don't even have to lean it all the way to stoichiometric to see an improvement in throttle response and gas mileage.
I remember when I had my car for a couple of months, and gas prices climbed over $4.00/gal, Works started offering their "Brain Flash Eco" to save Evo owners some gas.
http://store.worksmotorsports.com/WO..._p/107.102.htm
I thought it was evidence that Mitsubishi half-assed the factory software. They probably figured "Everyone is going to hack it, anyway. How much effort should we really put into it?"
I think their marketing targeted drivers who would be trading in gutless small-bore cars with weak throttle response, and a lot of Evo owners would be telling each other "You don't buy these cars for gas mileage." So they tuned it well enough to impress the target demographic on the test drive, and made sure it would never, ever run lean on stock software.
Yes, and I don't think Mitsubishi did that.
I think Mitsubishi prioritized the safety of the engine, and made the Evo X run rich at nearly all parts of the fuel map. I bet you don't even have to lean it all the way to stoichiometric to see an improvement in throttle response and gas mileage.
I thought it was evidence that Mitsubishi half-assed the factory software. They probably figured "Everyone is going to hack it, anyway. How much effort should we really put into it?"
I think their marketing targeted drivers who would be trading in gutless small-bore cars with weak throttle response, and a lot of Evo owners would be telling each other "You don't buy these cars for gas mileage." So they tuned it well enough to impress the target demographic on the test drive, and made sure it would never, ever run lean on stock software.
I think Mitsubishi prioritized the safety of the engine, and made the Evo X run rich at nearly all parts of the fuel map. I bet you don't even have to lean it all the way to stoichiometric to see an improvement in throttle response and gas mileage.
I thought it was evidence that Mitsubishi half-assed the factory software. They probably figured "Everyone is going to hack it, anyway. How much effort should we really put into it?"
I think their marketing targeted drivers who would be trading in gutless small-bore cars with weak throttle response, and a lot of Evo owners would be telling each other "You don't buy these cars for gas mileage." So they tuned it well enough to impress the target demographic on the test drive, and made sure it would never, ever run lean on stock software.
The car runs stoich at cruise from the factory, it always aims for stoich cruise. That is 100% fact and is programmed that way. I can show you proof in the tables and logs.
There are other ways to create better mileage at cruise than just fueling. Mivec, timing, open loop / closed loop stategies, etc.
You would be surprised what even just careful tuning of the mivec tables does for cruising mileage.
I also challenge that unless you are running the car in a 100% controlled environment, a 1mpg difference before/after should be considered within the line of data error and should be discarded.
