Ported intake manifold and MPG

[TheLorax]

I'm about to break 28,000 miles, I average 600 miles/week. I was already above 20,000 miles when I did the BNR Stage 1, so while it's possible; that would contradict the results of all the anecdotal experience posted in this thread.

No one has posted a loss of fuel economy, I'm just trying to quantify the results I've had. I started tracking mileage on 7/7 and this last tank data was collected on 8/22. That's only 53 days worth of driving to go a total of 5541.3 miles.* I'm fairly confident in my results, but this is in no way a scientific study.

*there are at least two tanks of gas that I did not track during this period because I was "fun driving" after I ported the intake.

All good points. I was just pointing out what could be a factor. It's awesome that you took it upon yourself to do this I wasn't trying to downplay it. It has probably made the decision for me that I'm probably going to port my intake at some point in the near future.

 

[Swordsmith]

I question whether ECO mode made any difference other than not letting you really put the hammer down. Would it be possible to do even short segment testing, putting ECO on and off again and watching your instantaneous mpg?

Very this has been a really educational thread, I'm glad I started it

 

[krakenredbeard]

I'm in Eco 98% of the time. I don't think it's just not letting you put the hammer down I think the throttle response is less too so even if you give it more there is a delay.

I can feel a change in the car when I pop in and out of Eco. Can also hear a difference in exhaust tone at cruising speed and idle. Sounds weird.




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[SoundWave]

I question whether ECO mode made any difference other than not letting you really put the hammer down. Would it be possible to do even short segment testing, putting ECO on and off again and watching your instantaneous mpg?

Very this has been a really educational thread, I'm glad I started it

I used it simply to be able to use Cruise Control, I do plan on requesting a non ECO mode tune after I've done the Bypass Bypass, so I Can do a side-by-side comparison. Will update with that, and that mod is easy enough to undo should I want to repeat the test without the bypass mod.

 

[2014 Blue RS]

I have a loss of mpg's. 21 around town. Freeway driving is down very slightly but less delay when I step on it to pass.

I hear people mention an Eco Mode. What's that? Does my RS have this?

 

[SoundWave]

I have a loss of mpg's. 21 around town. Freeway driving is down very slightly but less delay when I step on it to pass.



I hear people mention an Eco Mode. What's that? Does my RS have this?

It's a feature of the Trifecta tune, which was part of the Bad News Racing Stage 1 kit I installed.

I can't comment on how the intake mod will perform on an untuned car.


Typoed on my iPhone

 

[TheLorax]

I'm in Eco 98% of the time. I don't think it's just not letting you put the hammer down I think the throttle response is less too so even if you give it more there is a delay.

I can feel a change in the car when I pop in and out of Eco. Can also hear a difference in exhaust tone at cruising speed and idle. Sounds weird.




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Gah you people with your fancy buttons and cruise control! Must be nice lol

 

[krakenredbeard]

Not all models come with cruise? Didn't know that lol


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[TheLorax]

Not all models come with cruise? Didn't know that lol


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Ha nope! I have a basic LT hatch. The only options on it were the 1.4T and the inferno orange paint.

 

[Swordsmith]

The 2012 LT did not come with cruise control unless you paid extra for it, which I did (I think it was 200 bucks or so?). I got it because I planned to get the Trifecta tune and wanted the select-a-tune option. Turns out I like Cruise control on its own, and didn't see any benefit from Eco mode... but that's a different story.

 

[TheLorax]

The 2012 LT did not come with cruise control unless you paid extra for it, which I did (I think it was 200 bucks or so?). I got it because I planned to get the Trifecta tune and wanted the select-a-tune option. Turns out I like Cruise control on its own, and didn't see any benefit from Eco mode... but that's a different story.

I wish I had bought one with cruise. I got a leftover 2012 in 2013 for cheap though. I don't think anyone wanted inferno orange and a manual. If I hadn't been infatuated with the price of a leftover model I would have gotten one with cruise.

 

[Preloader]

MZ0 messed up my cruise control. I do kinda miss cruise control.

 

[TheLorax]

So what your saying is I should get an MZ0 to take full advantage of not having cc?

 

[Preloader]

That's pretty much exactly what I'm saying.

 

[TheLorax]

I'm moving soon and getting a house with a garage. Might be time to start looking at junkyards for an MZ0.

 

[Preloader]

I've gotten 3 on eBay. Ranging from $400-650. The best I got was $400+175s/h=$575

 

[ScarabEpic22]

MZ0 messed up my cruise control. I do kinda miss cruise control.

Did you change the gear ratios in the ECM after you installed the MZ0? If not, bet that's why you dont have CC anymore.

 

[Preloader]

I had Vince adjust the speedo, but I don't think he messed with the ratios.

The OEM shift light tells me to shift up even in sixth. LOL

I'm gonna be toning down some mods soon and maybe I'll see if he can address it when I approach him about a TurnDownForWhat tune update.

Back on topic, I wonder what the effects of porting the manifold have on MPG for those of us running the 42# injectors. Specifically idle, because of the less finely metering capabilities of the larger injectors at minimal pulsewidth.

I understand that the same amount of fuel can be delivered as the stock injectors, but the spray pattern is likely less effective, in which case the tumblers would be an advantage to air velocity.

Just thinking out loud.

 

[Stew]

I can still achieve the same MPG and I've ported my intake and have 42 lb injectors. In fact my last tank hand calculated to 40.1 MPG for the tank, that was 401.2 miles on 10.012 gallons.

The two biggest factors, I believe, are first and foremost the drivers driving habits and second what type of driving you do, such as city vs freeway.

Edit: My seat of the pants observations on idle quality, speed, etc is that I can't tell a difference from when it was stock to ported manifold to 42 lb injectors. The idle has always felt very consistent to me during all the various phases of stuff I've done.

 

[Preloader]

I've never chased MPG, but early on I did try for a high score. Never was able to get to 40mpg. Maybe high38/low39s. That was all freeway, trying my best not to exceed 65 unless downhill closed throttling. I am at sea level and I use 91.

Now with the MZ0, my highest MPG was 33mpg.

I also wonder what effects if any the aluminum flywheel has. I'll find out soon as I am going back to stock fly/clutch.