Do you guys know if this will affect the gas mileage? What I've heard is intake can increase your MPG but I just want to be sure.

 

It should increase mileage but I wouldn't expect to see anything significant. IMO it doesn't really pay off until you do intake and exhaust together. My Fit is bone stock but that has been my experience on other Hondas.

 

gad i wish they had that for GE's

 

AMEN

I did see somewhere were a guy installed the engine cover from an RSX on our GE.

 

i still think it looks like a giant CF chicken breast

 

I have been considering this mod as well. Let me know what you guy's observations are.

 

KFC Fried Chicken?

 

+1, air flow mods (full exhaust[headers also]/intake/filter/) and plus a tune will increase your mpg by a decent amount as far i remember thats how it worked for Civics.

 

I went to the dyno and noticed that this cars are pig rich in factory tune!

 

whats that supposed to mean?

 

This issue can be debating over and over, but if you think about it, the fit stock intake is meant for the car, its intended for low end response and best mpg. I had a cold air intake for a couple months and getting roughly 33-35mpg. i then put in a short air intake for the rainy season and getting between 32-35mpg. i decided to see how the stock one keeps up to the others (only with mpg, not performance) after having the stock intake back in ive been getting 36-39mpg.

FYI im running an axle back exhaust nothing else is changed.

 

yeah but you're not tuned for the exhaust and the CAI cuz obviously air flow has changed. So you got an increase in power and response which made the air to fuel ratio off which burnt a lil more fuel. That's why its suggested that if you do CAI and exhaust, you should get a tune. You don't have to, but if you want it running at the potential then u should.

 

Can you elaborate please?

Which car GD or GE?

What fuel and mods?

 

★☆★nice☆★☆

 

So what do you do to "tune" a Fit with aftermarket SRI and axel-back exhaust?

 

Well, our Fit's run on Speed Density. By changing the Exhaust and the Intake setup, you have changed the VE table.

The fuel and timing maps are based mainly on this VE table with an IAT correction factor usually above a certain TPSVoltage.

So you would have to recalibrate the VE table, which would put you back in the proper targeted cells for AFR and Spark advance.

There's actually more to it than that, but that should give you a pretty good picture of what is going on..

 

I was more interested in how to do it, not what is going on. Any thoughts on the steps to do the tune? Plain English is a good teaching tool too.

 

That was in plain english.. all of the terms and acronyms used in my posts are universal in tuning PCMs.

VE - Volumetric Efficiency
IAT - Intake Air Temperature
UEGO - Universal Exhaust Gas Oxygen
AFR - Air Fuel Ratio

Any others I can clarify?

To do any of the suggested actions above you would need a UEGO Gauge and Controller along with an EGT to monitor the engine and something along the lines of the AEM FIC or a piggyback like an S-AFC II to control, adjust and datalog.

Then you would have to do some driving to calibrate in consisten atmospheric conditions and adjust the VE table.

Once your new VE table is established you can start playing with temperature correction, timing and fuel settings, etc..

Get progressively more aggresive till you start to see knock and then either pull a degree or two of timing for a margin of safety, or run slightly richer than necessary.

 

nicely done. good that a more experienced person came in chimed in and thus agreed with me at the same time :]

Even the process that he has explained is harder than you think. If you're not experienced with things like this, you should get it professional tuned at your local tuner shop with good rep. Even if you plan on doing it yourself, you still need to get a piggyback or standalone which is a bit pricey plus you have a lot to learn and you'll probably have to tweak the settings constantly.

But i believe that getting the factory ecu reflashed is an option? but you would have to go get that done professionally. Cost varies depending on the place you get it done. Chime in if I'm not correct.

once the car is properly tuned... you will be getting the optimum performance from the stock intake and exhaust including fuel economy and freed up horsepower.


-KweenJD's bf btw. lol