Full Bolt Ons- Performance VS. Gas Mileage

[AdeJong 03]

Hey guys I was reading in a couple threads and noticed that some cars are making some pretty decent power increases from bolt-ons. Not just intake here or exhaust there, everything.

I was wondering if people can tell me everything they did, how much power they made, and if it affected their gas mileage in a good or bad way.

Id assume that putting intake, headers, pulleys, and exhaust on the car is going to net you some decent whp but did you sacrifice mileage?

[cali yaris]

intake/header/pulleys/exhaust and I dyno'd 108 whp. baseline was 94. My dyno is in the thread where dyno charts are posted.

Mileage wasn't affected for the same kind of driving -- but the point of those mods is to go faster so I drove.... well, faster!!

Header is singular by the way, we have just the one header on our 4-cylinder cars.

[YarisPR]

intake/header/pulleys/exhaust and I dyno'd 108 whp. baseline was 94. My dyno is in the thread where dyno charts are posted.

Mileage wasn't affected for the same kind of driving -- but the point of those mods is to go faster so I drove.... well, faster!!

Header is singular by the way, we have just the one header on our 4-cylinder cars.

x2 Modded Yaris and I even feel I get better MPG. I've been getting 29-33MPG on city driving and I'm ridding on 18"s

[Aothachos]

so far i have pulleys, cai, and exhaust, but stock header and i feel a little bit more power i think the biggest difference was the pulley system, the pickup was so much better and smoother =)

mpg well depending on how i drive the first bar usually goes around 70miles for me

[blacksandiegovitz]

intake/header/pulleys/exhaust and I dyno'd 108 whp. baseline was 94. My dyno is in the thread where dyno charts are posted.

Mileage wasn't affected for the same kind of driving -- but the point of those mods is to go faster so I drove.... well, faster!!
Header is singular by the way, we have just the one header on our 4-cylinder cars.

Lol , I feel the same way . If I were to drive this car with the intent to get the best mpgs I think stock vs. modded would be @ least equal if not better on mpg's (mabey 1 or 2 more) with modds cause you don't have to get on the gas as much since you have a little more power . I am killing my mpg's with the heavy-ass 18" rims and am still getting around 28-32 soon to be switching to lightweight 15" rims so mpgs should greatly improve .

[toyo]

as long as you dont get bigger injectors, fuel pump, rail, you should be ok, but if you want more power, get a faster car ;)

[botchilah]

I think putting bigger wheels and tires will affect fuel economy more than simple bolt-on upgrades assuming you drive pretty much the same way.

[AdeJong 03]

I think putting bigger wheels and tires will affect fuel economy more than simple bolt-on upgrades assuming you drive pretty much the same way.

i agree with that. which is why im only goin up to 16''

[cali yaris]

if you want more power, get a faster car ;)

umm.... wrong? :wink:

[TheRealEnth]

money = speed = ....... speed = power so power = money

[AdeJong 03]

i dont want a car that is known to be quick

besides the gas mileage isnt nearly as good lol

i could have gotten the civic si for a few thousand more but gas mileage is shit on that car.

[Mouse]

Garm,
What header were you running?

[cali yaris]

^ Megan Racing, sold it after installing turbo, it was in perfect shape.

[Mouse]

Thanks.

[Mouse]

Has anyone dynoed full bolt-ons plus a light flywheel and clutch?

[cali yaris]

A clutch doesn't add wheel horsepower?

[jt258]

I HAVE I/H/MP/E WITH UNDERDRIVE PULLEY KIT & 1ZZ THROTTLE BODY AND 18X7 INCH WHEELS AND IM GETTING ABOUT 34 MILES TO THE GALLON HWY. IT JUST DEPENDS ON THE WAY YOU DRIVE.

[Mouse]

You free up power that was already there. But still I'm curious.

It does if you could install a clutch and flywheel with a combined weight of 14 pounds.....similar to this....http://www.949racing.com/index.asp?PageAction=VIEWPROD&ProdID=197&HS=1

[AdeJong 03]

I HAVE I/H/MP/E WITH UNDERDRIVE PULLEY KIT & 1ZZ THROTTLE BODY AND 18X7 INCH WHEELS AND IM GETTING ABOUT 34 MILES TO THE GALLON HWY. IT JUST DEPENDS ON THE WAY YOU DRIVE.

DOES IT REALLY?!?

dont gotta yell it lol

[yarstar]

CAI, Header, full pulley kit (<10%), 1ZZFE Throttle Body. My car is ALOT faster than it was stock, and with 15" Enkei RPF1s, I get solidly 35mpg combined, and I KEEP MY FOOT IN IT ALL THE TIME.

I built it to drive it. And I do.

I also wanted good gas mileage. Which I kept.

:headbang: