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Discussion Starter · #1 ·
This car hasn't been over 4500 rpm and now has 380 kms on it. Needed a fill up today. Mostly highway driven. Yup 380 kms and $58.00 of gas at $1.23 a liter. 12.4L per/100k First tank so I am giving the car the benefit of the doubt on the break in. Sure hope I will be able to tune some mileage out of this. Seems like a lot of fuel for a 2.0 liter engine. Will keep everyone posted. Night all.
 

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This car hasn't been over 4500 rpm and now has 380 kms on it. Needed a fill up today. Mostly highway driven. Yup 380 kms and $58.00 of gas at $1.23 a liter. 12.4L per/100k First tank so I am giving the car the benefit of the doubt on the break in. Sure hope I will be able to tune some mileage out of this. Seems like a lot of fuel for a 2.0 liter engine. Will keep everyone posted. Night all.
Turbo charged man...it is not a freaken Civic SI :thumbup:

edit: Oh and it is running rich
 

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alot of my sub par hi way' mileage surely has to do with the gearing. 5th is a bit short so cruising at 80 or so chows it up. Premium is up to 4 freakin' dollars around here. Will it ever stop:mad:

Ideally on the freeway I'd love to have a taller top gear or a 6 speed. I'm sure with another equally spaced gear this thing would be an awesome freeway runner. Right now with the 45 series Bridgestones 3700+ keeps me at 80...I'd like to have that come down to around 3200 or 3300. Probably get close to 29 or 30 mpg with a good tune cruising at 70

On the other hand the ratios are great in other instances. Mountain roads are great. The track will surely rock'

I have to admit it is the ONE THING that really bothers me. I drive to work on a freeway with a 75 mph limit every day. If you cruise at 75 every one passes you
 

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Running rich is probably the bigger cause. I still saw 26mpg mixed city/highway in my turbo'd tc when I stayed out of boost. There are a lot of turbo'd cars that get better gas mileage than this.
 

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Running rich is probably the bigger cause. I still saw 26mpg mixed city/highway in my turbo'd tc when I stayed out of boost. There are a lot of turbo'd cars that get better gas mileage than this.
I beg to differ. I know it's mostly the gearing. (at least in my situation)..and the rich condition second. A killer tune and a 6 gear and we wouldn't be having this conversation...instead we would all be bragging about the great MPG and how far a tank would go

I'm at 1400 miles now. About 850 of those miles have been on the freeway. A shock has been how it eats more on the freeway!!!
 

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Running rich is probably the bigger cause. I still saw 26mpg mixed city/highway in my turbo'd tc when I stayed out of boost. There are a lot of turbo'd cars that get better gas mileage than this.
Well it's kinda both... And staying out of boost on the highway in this thing is impossible. I mean it spools at 2500 for jeebus sake. How can you stay under that in the highway?
 

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Well it's kinda both... And staying out of boost on the highway in this thing is impossible. I mean it spools at 2500 for jeebus sake. How can you stay under that in the highway?
^+1. Maybe around town but forget about the freeway...constantly in the boost.

I say give me a sixth gear and a real clean tune and I'll show you up to 30mpg on a nice smooth freeway (no headwind lol):rock:I sure hope the MR's have the better gearing...my original plan is trading the GSR for the MR next year. I'm sticking with that plan
 

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I am hoping that the Unichip tune with Perrin will resolve most of the gas issues. Hopefully I will have a very positive update later this week!
 

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I beg to differ. I know it's mostly the gearing. (at least in my situation)..and the rich condition second. A killer tune and a 6 gear and we wouldn't be having this conversation...instead we would all be bragging about the great MPG and how far a tank would go

I'm at 1400 miles now. About 850 of those miles have been on the freeway. A shock has been how it eats more on the freeway!!!
Actually my tc had similar gearing (mechanically limited by the gears to about 130mph at a 6200rpm redline). I was at about 3800-3900 rpms at 80mph. I was running an evoIII 16g at 8.5 psi (full boost at 2800rpms), stock 2.4l motor, 550cc injectors, tuned with an AEM FIC to around 11.5 afr. That's my only experience with another turbo'd car, so I'm sure everyone's opinions will differ. Just thought I would share mine! :thumbup:
 

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Actually my tc had similar gearing (mechanically limited by the gears to about 130mph at a 6200rpm redline). I was at about 3800-3900 rpms at 80mph. I was running an evoIII 16g at 8.5 psi (full boost at 2800rpms), stock 2.4l motor, 550cc injectors, tuned with an AEM FIC to around 11.5 afr. That's my only experience with another turbo'd car, so I'm sure everyone's opinions will differ. Just thought I would share mine! :thumbup:

I'm not stating an opinion here..it's fact. X is low geared , running rich and comes on boost early. Those are facts. That's a recipe for dismal MPG's if you drive at normal speeds...normal speeds for a car enthusiast that is:godance:

Compare my STi 6 speed that would let me cruise at 90 all day and still get reasonable mileage. I'm sure missing that gearbox now...no matter how notchy that POS was. Why didn't Mit's put a solid 6 speed in the X? They are in direct competition with the STi. Makes no sense except to save $$
 

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Discussion Starter · #17 ·
I agree a regualr no BS 6 spd would have been the ticket. I will find out soon but I am betting it is dumping extra fuel in just for the cats. Just driving the demo before I bought this car lead me to believe it is so rich that it is almost quenching the flame front. I guess we will see what a piggy back( Uni Chip) will do but for me our company is awaiting the ECUTEK package to arrive from UK. Here is one for you all there is no need for a proper running car of that size weight and aerodynamics to need to burn that much fuel turbo or not. Fuel is only needed when in boost. This car has been driven so nice barely boosted at all to break in the engine. Before we dyno we will be doing a leak down and I will keep you all posted of what I find.
 

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I agree a regualr no BS 6 spd would have been the ticket. I will find out soon but I am betting it is dumping extra fuel in just for the cats. Just driving the demo before I bought this car lead me to believe it is so rich that it is almost quenching the flame front. I guess we will see what a piggy back( Uni Chip) will do but for me our company is awaiting the ECUTEK package to arrive from UK. Here is one for you all there is no need for a proper running car of that size weight and aerodynamics to need to burn that much fuel turbo or not. Fuel is only needed when in boost. This car has been driven so nice barely boosted at all to break in the engine. Before we dyno we will be doing a leak down and I will keep you all posted of what I find.
Eaglerly awaiting to hear your results. I'd love to find a way to bolster more power as well as increase the mpg.
 

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In addition to tune, the software on the electronic throttle may also be partially to blame. If it's been programmed make the car feel more responsive to accelerator inputs then that will also use up more gas even without getting into boost.
 

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I am hoping that the Unichip tune with Perrin will resolve most of the gas issues. Hopefully I will have a very positive update later this week!

Interesting question PDX...are the Unichip guys only chnaging the WOT fuel timing tables or are they working the close loop and trim tables?

If they are only working WOT, mpg will still suck :)
 
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