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Discussion Starter · #1 ·
Like the title says, does not having a cat effect gas millage? The reason that I ask is I've just installed a Down pipe with no cat and it seems like my gas millage has gone to sh!t. I don't have a staged ECU. If I throw a code for no cat, and don't have a staged ECU does it hurt performance or anything else?
 

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Im S2 and catless....I didnt really notice a difference in gas mileage....

Are you just flooring it more often now?
 

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i dont have a cat and my mileage went up, less restrictions less gas needed to get u going:clap: :clap: maybe your liking the way it souds when you floor it, hence why gas mileage went down on you :jester:
 

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Discussion Starter · #4 ·
Can't afford to floor it with gas prices the way they are. I have taken that into consideration(flooring it more often). I'm wondering if it's just me now noticing the fuel gauge sink down into the red. What about the CEL that I've thrown, does it affect the gas millage or performance? Any way to fix the CEL without Staged ecu?
 

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12envy said:
Can't afford to floor it with gas prices the way they are. I have taken that into consideration(flooring it more often). I'm wondering if it's just me now noticing the fuel gauge sink down into the red. What about the CEL that I've thrown, does it affect the gas millage or performance? Any way to fix the CEL without Staged ecu?
spark plug fouler
 

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More than likely the problem your seeing is the fact that your turbo is spooling faster with the new dp. Even under light acceleration, your probably seeing boost sooner than you were before with the same amount of throttle. I have done alot of tinkering with things and logging my gas mileage. 10vac vs. 15vac cruising will show a difference of close to 5mpg. You being closer to the 10vac now even though before with the same amount of throttle input, you were closer to 15vac. Follow me here? The less vac/more boost the car see's, the more fuel it will add. Even if you are not in WOT.
-Garrett
 

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Discussion Starter · #7 ·
thirteens420k said:
More than likely the problem your seeing is the fact that your turbo is spooling faster with the new dp. Even under light acceleration, your probably seeing boost sooner than you were before with the same amount of throttle. I have done alot of tinkering with things and logging my gas mileage. 10vac vs. 15vac cruising will show a difference of close to 5mpg. You being closer to the 10vac now even though before with the same amount of throttle input, you were closer to 15vac. Follow me here? The less vac/more boost the car see's, the more fuel it will add. Even if you are not in WOT.
-Garrett
5mpg:wah?!: I didn't think that a vac difference of 5 would result in difference of 5mpg. I have noticed in increase in spool but I compensated as best as I could with my Greddy EBC. I trimmed out as much of the start boost setting as I could to get it to spool slower. This helped but I also have an AGP WGA that doesn't help matters. I have noticed what you are referring to about the increase in vac/boost with the same amount of throttle input. I'll try to keep my vac in at 15, which I think is damn near, impossible with an AGP WGA and catless dp.:tongue:

Thanks for the input:hi:
 
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