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gas milage gains/loss with FlashPro?

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8.5K views 36 replies 19 participants last post by  Elitetuning  
#1 ·
Hi,

I've done a search on this and did not find a topic on this yet.

I am currently running with just AEM CAI and everything else stock. I was curious if investing in a FlashPro will up my MPG or hurt it.


Thanks ahead
 
#3 ·
it really depends on how you drive. I think the flashpro will hurt your gas milage because of how it remaps your ecu, and with the vtec being lowered that wont help either. However any of those bolt-ons that you do (ie. intake, header, exhaust) will actually increase your gas milage.
 
J
#8 ·
It's all in the tune and driving style. When running on MAP based calibrations, the fuel meter fluctuates a lot. I've been running off my trip meter and getting around 300 miles per tank. When my car was tuned when the FlashPro first came out, my gas milage stayed the same while extracting 20 more horsepower. I recently had my car retuned since there have been 4-5 updates. My gas milage has improved to like, 315-325 miles per tank.

The main difference for me is when my car was first tuned, knock count and knock sensitivity wasn't available, so my car would just retard ignition all the time. I run Skunk2 cams which generate A LOT of noise which is usually mistaken for knock. But after tuning, the car drives much smoother at part throttle, better A/F ratios, peak power hasn't been affected and MPG is improved.
 
#9 ·
@Jdizzle, thanks for sharing your personal experience.

I'm pretty foot "light" and since my Si is my DD, I drive pretty conservatively. I just wanted to see if I can keep/increase my MPG with a reflash while gaining more performance.

@whiteknight: that may be true..vtec is too fun :wheee:
 
N
#12 ·
I am getting slightly better fuel economy with the FlashPro, especially after the dyno tune. I was getting about 25-26 mpg. Now I am up to almost 28 mpg. To be honest, my car has never had great fuel economy, even bone stock. I remember two years ago getting around 24 mpg and I was so ticked, especially when the price of gas was near $4.00/gallon. My driving however is mostly a combination of stop and go city driving and some short freeway driving, with a good number of spirited VTEC's thrown in for good measure LOL.
 
H
#16 ·
The calculation for fuel economy is miles divided by gallons. Miles per tank is not a good way of measuring consumption. As a rule of thumb, beating the EPA estimate by 1-2 mpg is about right. 22-23 mpg city, 28-30 mpg freeway is about right.
 
N
#17 ·
Absolutely! Fuel economy should not be measured by the tank as the amount in the tank can vary. I still am amazed when I read of people getting 400 miles + on their Si's. Sounds like my car is just where it should be.
 
#21 ·
If your car has a good part throttle tune, you will get better gas mileage as long as your foot isnt heavier... everyone who says there not getting as good or better MPG then its one of 2 things, your foot is heavier or your part throttle tune is off
 
S
#23 ·
I fill up at the same gas station every time, have calculated my miles/gallons for the last month or so. I drive 50 miles one way to work, 3 days a week, all on I-95.

I'm averaging about 28 mpg, and that's with plenty of vtec thrown in when I'm not on I-95. So all in all, about the same as before.
 
J
#26 ·
Definitely. There's so many benefits to the Flash Pro. Under their training videos, they have a video to tune for optimal economy. Since the Flash Pro can store 2 calibrations in the unit itself, you can have your performance tune for days you feel like getting crazy/track days and then flash to the economy tune for the rest of the time. Again, with proper tuning you can find a compromise.

From what I've been noticing with others, it seems that people who are lowering their VTEC points are the ones who are suffering the most. I actually ended up raising my VTEC point from stock because I was generating more power on the low speed cam around 5,800 RPM's. In boosted applications you need to have a lower VTEC point, but in NA it's not exactly necessary. I think the best bet would be to set a VTEC window with the lower boundary engaging under full throttle. That way you'll have the high speed cam going when you're pushing it, but you won't be in it during regular driving.
 
H
#27 ·
jdizzle37 said:
In boosted applications you need to have a lower VTEC point, but in NA it's not exactly necessary.
Click to expand...

The VTEC point is very specific to the setup of the car.

- A Greddy turbo has a high VTEC point - 6000 rpm
- A tubular turbo manifold setup may need a VTEC point of 4000-4500 rpm.
- CT and JR superchargers need a VTEC point pretty much as low as you can get it but is usually set at 3000-3500 rpm for practicality.
- The longer the primary and secondary runners on a header the lower the VTEC point.
 
#33 ·
The volume of the tank is constant. However, you're failing to realize that we have no way of filling up the tank to the exact same mark each time. One time we may fill it up 95% of the way and then drive 305 miles, then fill it up again and fill up 91% the next time. See how it becomes inconsistent?
 
H
#34 ·
There's three different sets of variables when calculating fuel economy:

- how accurately the miles are measured.
- how consistent the empty fuel level is when you fill up
- how consistent the full fuel level is when you fill up

If you divide miles by gallons to calculate fuel economy then you eliminate one of the variables, which is also the least accurate.
 
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