So those of you with intakes... come in here please... v.MPG

[clayrush]

How log do you need to leave the battery disconnected to reset the ecu anyhow?

[Mars2]

Originally Posted by mashal

400 miles out of tank?? That's like 620 km for us Canadians , I only get 400 km per tank .. Heavy right foot I guess


I-Tapatalk

Woaw 620 km (400miles) that's a dream!!!!
Here in Europe I see around 450 km(280 miles) if cruising on highway and about 320 km (200 miles) when on B road (14 liter/100km).
Did you swap for for a Boxer diesel 2.0 engine

[2forme]

Originally Posted by seven

Ah. ok, so the MAF is skewed and therefore the data is too.

Thanks sir!

I was under the impression that the MPG calculation was based off the injector duty and not the airflow.... The injector duty is calculated from the airflow reading and load (amongst a few other things). So it would be calculated AFTER the airflow was already analyzed and not during...

[arghx7]

Originally Posted by 2forme

I was under the impression that the MPG calculation was based off the injector duty and not the airflow.... The injector duty is calculated from the airflow reading and load (amongst a few other things). So it would be calculated AFTER the airflow was already analyzed and not during...

If the airflow reading is skewed in particular conditions, that propagates through a bunch of other calculations. These calculations include fuel trims and engine load used for enrichment scheduling. It also throws off any correction factor used to more closely align the MPG calculation with laboratory tests using fuel flow meters.

Changing anything related to the MAF or the fuel system actually skews a ton of stuff. It's not something to take lightly. The ECU is smart enough that you as a driver usually won't notice it but on a lot of platforms an intake mod is a huge deal. A lot of people remember putting an ebay cold air intake on some 90s Civic without a MAF sensor. So they don't realize how an intake change has so many implications on a modern vehicle.

[2forme]

Originally Posted by arghx7

If the airflow reading is skewed in particular conditions, that propagates through a bunch of other calculations. These calculations include fuel trims and engine load used for enrichment scheduling. It also throws off any correction factor used to more closely align the MPG calculation with laboratory tests using fuel flow meters.

Changing anything related to the MAF or the fuel system actually skews a ton of stuff. It's not something to take lightly. The ECU is smart enough that you as a driver usually won't notice it but on a lot of platforms an intake mod is a huge deal. A lot of people remember putting an ebay cold air intake on some 90s Civic without a MAF sensor. So they don't realize how an intake change has so many implications on a modern vehicle.

If the calculations for MPG use MAF as an input then it shouldn't matter. If the maf reads less air, it's going to use less fuel.... the speed/distance don't change.

On a very rudimentary level, say you have two identical cars traveling the same speed with the only difference being MAF reading. Car A with a richer MAF reading is going to get less MPG than Car B with a leaner MAF reading.

My point is, the MPG reading doesn't skew with the MAF, it's a reflection of the MAF skew. It's not like it's going to read 45 MPG when your car is running richer or vice versa. It's just a function of the parameters it sees, which includes the MAF sensor amongst other things. But it directly correlates to the amount of fuel being used.

[Rayme]

Originally Posted by arghx7

If the airflow reading is skewed in particular conditions, that propagates through a bunch of other calculations. These calculations include fuel trims and engine load used for enrichment scheduling. It also throws off any correction factor used to more closely align the MPG calculation with laboratory tests using fuel flow meters.

Changing anything related to the MAF or the fuel system actually skews a ton of stuff. It's not something to take lightly. The ECU is smart enough that you as a driver usually won't notice it but on a lot of platforms an intake mod is a huge deal. A lot of people remember putting an ebay cold air intake on some 90s Civic without a MAF sensor. So they don't realize how an intake change has so many implications on a modern vehicle.

We all did that. Im waiting for a manufacturer that can provide an intake that retains the same diameter and fins like the stock intake.. I don like those intake that give power by leaning out the mixture...reminds me of those resistors they used to put on the intake air temp sensor to lean the fuel..wrong way to do things imo

[seven]

Originally Posted by ottopilot

We all did that. Im waiting for a manufacturer that can provide an intake that retains the same diameter and fins like the stock intake.. I don like those intake that give power by leaning out the mixture...reminds me of those resistors they used to put on the intake air temp sensor to lean the fuel..wrong way to do things imo

You'll be waiting a while for that. The idea is to put more air in the car, volume makes that easiest. A stock tube size cone filter wouldn't add much power if any. Just throw a panel filter in there if you feel that way.

Honestly ANY mods should be done with a tune added for them... however I'm waiting a bit for a re-flash til I have a few other things installed.

[wparsons]

Originally Posted by Mars2

Woaw 620 km (400miles) that's a dream!!!!
Here in Europe I see around 450 km(280 miles) if cruising on highway and about 320 km (200 miles) when on B road (14 liter/100km).
Did you swap for for a Boxer diesel 2.0 engine

How heavy is your foot?? I've hit over 600km's a couple times on mine, with almost all highway driving. I average almost 500km's with mixed city/highway (mostly city) later, with the colder temps and snow tires on.

[2forme]

Originally Posted by seven

You'll be waiting a while for that. The idea is to put more air in the car, volume makes that easiest. A stock tube size cone filter wouldn't add much power if any. Just throw a panel filter in there if you feel that way.

Honestly ANY mods should be done with a tune added for them... however I'm waiting a bit for a re-flash til I have a few other things installed.

You might not have to wait THAT long