newbie ? How do performance mods affect mpg's

[thepamp3]

how does CAI or performance exhaust affect gas mileage?

[kris5597]

CAI allows better air flow. your car breathes easier your gas mileage will improve. with exhaust minus the cats and bigger pipes less exhaust restriction your MPG will improve.

[-Devil-]

the only way a mod helps increase fuel milage ... is it increases the power output of a motor .. which in turn doesn't require as much effort to move the car ... and if you take advantage of the decrease in effort .. you will at the same time decrease fuel consumption ...

[toyota_scion_tc]

It helps my car for example stock I would only see 22-23 city and 27-28 highway. Now with CAI, 4-1 header, full 2.5" exhaust, centerforce clutch, fidanza lightweight flywheel, and etc my car averages 24-25 city and 31-33 highway when I drive like I have sense (which isn't too often, LMAO).

[gotDAMD]

I used to get around 280 to 300 miles on a tank of gas now I'm lucky if I get 239.

[Silvertoast]

i have a 06 xb installed a trd axle back sounds better but not much performance gain and no mpg gain, installed fugita short ram intake, better throttle response but dropped my mpg from 33-34 in town to 31-32 in town and i only get 32 on the highway, seriously considering putting my factory airbox back on with a k and n air filter in it. the only thing stopping me is the fugita looks better lol

[kris5597]

damn with an axel back and intake i was getting 29 with a heavy foot. about 330 miles per tank. now when i get paid again lol, ima fill up. ( i hate saying that). and ill check my mpg with my setup now. with a heavy foot then again with a light foot, as much as possible lol.

[Binder86]

You wont see a real difference in gas mileage. and regards to the second comment putting on a wider exhaust and taking off the cats will make your gas mileage worse. first off it will lessen backpressure causing a rich mixture, secondly the cats is an emissions device and witout it there isn't a need for the secondary o2 sensors and bye bye long term fuel trim=more trips to the pump.

[-Devil-]

You wont see a real difference in gas mileage. and regards to the second comment putting on a wider exhaust and taking off the cats will make your gas mileage worse. first off it will lessen backpressure causing a rich mixture, secondly the cats is an emissions device and witout it there isn't a need for the secondary o2 sensors and bye bye long term fuel trim=more trips to the pump.

when a system is designed properly, those things do not happen ...

yes if it is just random parts that are put on there, things can get worse ...

[Binder86]

umm ok ive been building cars for tha last 4 years and everything i've done (until the last leg of my last tc) have been done correctly. The tc is a fuel efficient car to begin with so even if you drive 100 miles and some more a week you'll still only go to the pump once whether its modified or not so you tell me are you really seeing a difference besides give or take 15-25 hp, which on its own is really hard to feel the power gain to begin with.

[-Devil-]

i am not talking about power gain ... i am talking about mpg ... as for the other info ... most every car i have built since the late 80's has shown differences in mpg and power when the mods are done correctly .. and parts are matched up .. not just randomly bolted on ...

on my current one, yes i have noticed a difference in mpg and 'performance' (yes i use that word loosly, because what one considers performance and what other considers it can be vastly different) with what i have done to it so far ...

but instead of arguing about it, i won't reply again ... so that you can continue on with your thought of what works, and i can continue on with what i know works.

[_Keith_]

Sorry guys ive been tuning cars for years now...

The more mods the more air/fuel it takes in... the more fuel it burns the less mpg you will have...

If your dumping air in you need to add more fuel.

In other words burning fuel faster...

[Spock]

Sorry guys ive been tuning cars for years now...

The more mods the more air/fuel it takes in... the more fuel it burns the less mpg you will have...

If your dumping air in you need to add more fuel.

In other words burning fuel faster...

So you are saying that adding an exhaust will decrease gas mileage? I don't think so. Some mods will increase mileage, however most of the time people get their foot into more often after moding and I think that is what effects the mileage. Not saying that there aren't mods that decrease mileage just disagreeing that all mods decrease mileage.

[Binder86]

keith thank you for your comment and shedding better light on the topic. and Devil your a dumb noob. thepamp3 i understand that you may be new to tuning and modifying cars and appreciate your love for a new hobby and hope all is well for your future mod making and try to learn as much as possible so you can help others in the future. I'm not trying to harp on all noobs, just the ones that make dumb statements.

[Spock]

keith thank you for your comment and shedding better light on the topic. and Devil your a dumb noob. thepamp3 i understand that you may be new to tuning and modifying cars and appreciate your love for a new hobby and hope all is well for your future mod making and try to learn as much as possible so you can help others in the future. I'm not trying to harp on all noobs, just the ones that make dumb statements.

wow that was ignorant and not helpful to the discussion, nor did you attempt to answer the question at hand. Why don't you just keep the useless comments to yourself.