Official JDM BRZ weight and MPG

[carbonBLUE]

Originally Posted by serialk11r

Efficiency at low rpm is only compromised with poor design, and low load efficiency is ALWAYS poor. Proper gearing ensures proper load, and direct injection or variable valve timing ensure good combustion at low speed. Tuning an engine for greater max power is not why a 2ZZ-GE gets only 30mpg on the highway while a civic with its 1.8 can cruise along at 45mpg. The variable lift actually makes low rpm combustion quite efficient.

When you throw a turbo on you're changing the equation quite a lot, but many performance oriented designs are not inherently far worse for fuel economy. An engine typically doesn't run well below 1500 rpm (that is, the efficiency starts to go down as you demand more load from it), so there are limits to how high you can go on displacement before you cannot get efficient street driving no matter what, but you don't hit that until you go past 3L.

Also, not all things are a performance/efficiency tradeoff. If you want a mindblowing example, high rpm cams + direct injection like we have on the FA20 give poor low rpm VE, but the direct injection maintains combustion stability and efficiency and increases thermal efficiency. That's right, the high rpm torque bias will give you better mpg around town.

i get 30 mpgs in my celica... doing 100 mph....

i have gotten 42 mpgs doing the speed limit traveling with a few slow poke friends and thats with shorter gearing than a base model civic...

[serialk11r]

Originally Posted by carbonBLUE

i get 30 mpgs in my celica... doing 100 mph....

i have gotten 42 mpgs doing the speed limit traveling with a few slow poke friends and thats with shorter gearing than a base model civic...

Derp sorry...misinformed lol. I get these numbers mixed up in my head. I remember S2ks have very very poor cruising mileage though.

So better comparison, Civic Si vs. S2000. Not as much of a difference, but it sure isn't because the S2k has "more horsepower".

[tranzformer]

Originally Posted by chulooz

If there is one thing I am not worried about its MPG's, I sure wont be driving it with fuel economy in mind.

If gas prices hit $4-5 we might be saying otherwise. Luckily this car won't be getting horrible mpg's, but it is lightweight and has a good cd. No reason it shouldn't get good mpg (not talking about hybrid level).


http://abcnews.go.com/Business/gas-p...6#.TzFYyFEyBhM

[ahausheer]

Lets get back on topic, perhaps some members that can read Japanese can find cars with comparable mpg numbers that are also sold in other markets so we have an initial comparison.

[tranzformer]

Originally Posted by ahausheer

Lets get back on topic, perhaps some members that can read Japanese can find cars with comparable mpg numbers that are also sold in other markets so we have an initial comparison.

You haven't been on here a lot have you?

[OrbitalEllipses]

Originally Posted by chulooz

No, it actually is true. Find a tuner that will tell you different.

Along these lines, most "stage 1" tunes actually gain 1-2MPG simply due to smoothing and leaning out of the AFR curve. Now, a 300+ hp car that's dumping more fuel and going full throttle all the time isn't going to be fuel efficient, but the stock tunes on performance cars are questionable for emissions reasons (see 07+ STI stock tunes).

[ahausheer]

Originally Posted by tranzformer

You haven't been on here a lot have you?

You kidding me I check this site like 100 times a day, I think I have a problem.

[tranzformer]

Originally Posted by ahausheer

You kidding me I check this site like 100 times a day, I think I have a problem.

Then you would know this is basically as on topic as any thread there is after +2 pages.

[illmatic]

I believe the new Mazda Axela(JDM Mazda 3) skyactive has start/stop technology, hence the great JC08 testing.

[serialk11r]

^^^ that would do it. Japanese test makes idle consumption pretty important.
Actually let's see...it spends 4-5 minutes idling, which would consume around 0.05-0.07L typically. Their total driving distance is 8.171km, so the total fuel burn is on the order of 0.5L. So the idling easily comprises 10% of overall consumption.

That doesn't explain why the Impreza with CVT is doing so much better though.

[Kostamojen]

Remember, curb weights are measured differently in different countries. Expect different numbers to show up, but that chart is exactly what we are looking for (IE from the manufacturer).

[carbonBLUE]

Originally Posted by chulooz

If there is one thing I am not worried about its MPG's, I sure wont be driving it with fuel economy in mind.

we should do an endurance race, fr-s vs s2000, 10 gallons of gas, lets see who goes further... lol

[chulooz]

Originally Posted by tranzformer

Then you would know this is basically as on topic as any thread there is after +2 pages.

Page 2 ??? How long have YOU been here? hahaha

[tranzformer]

Originally Posted by chulooz

Page 2 ??? How long have YOU been here? hahaha

I gave us the benefit of the doubt. Usually threads do fairly well for the first page until we go on a tangent.