im about to get a test pipe for my car and i know all the **** like it smells and is illegal and all that **** but does it affect gas mileage on a stock exhaust?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93ejay1 &raquo;</TD></TR><TR><TD CLASS="quote">im about to get a test pipe for my car and i know all the **** like it smells and is illegal and all that **** but does it affect gas mileage on a stock exhaust?</TD></TR></TABLE>

As if those reaons weren't enough, yes, it will hurt gas mileage. Your O2 sensor(s) will foul in short order and the computer won't know how much fuel to meter so you'll end up running progressively richer and richer.

Test pipes give you like .3hp anyhow. Don't get one.

 

even in an obd1 car with a stock header? and they add more than .3 hp. have u ever seen them dynoed before and after? cuz i have

 

bump for answers

 

Bump for a question i was thinking about asking in the near future

by the way ejay ... what was the peak gain from the test pipe & what range was it at ?

 

nobody knows from experiecne?

 

Gained 5.2whp with test pipe

 

based on my experience yes it does affect gas mileage. yes i gained some hp. but its not worth it specially if you get slapped with a ticket. i heard its a really huge fine. dont do it man. just looking out for you

 

did it go up or down? can u feel the difference or just hear it? honestly. around here cops dont really check for cats but just to make sure i was gonna paint it black and put the stock shield around it

 

Honestly man, your in cali, just get a high flow cat.

Unless if your going turbo i dont see a reason to use a test pipe.

 

Yes it is louder and I suck down more gas too! Is it still worth it, I think so.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93ejay1 &raquo;</TD></TR><TR><TD CLASS="quote">even in an obd1 car with a stock header? and they add more than .3 hp. have u ever seen them dynoed before and after? cuz i have</TD></TR></TABLE>


on a turbo car it will maybe but on a stock car with a stock exhaust alll i forsee is a sniky loud ricy civic

EDIT: you know the fine is 2500$ in cali for a test pipe rite?

 

well im waiting on a guy on here thats selling a greddy evo catback so it might not be stock for much longer

 

thats still pretty much stock im talking about upgrades like a turbo sumpercharger something that requires faster flow of the exhaust gases..a cat back with a header isnt nearly enough save your 20$ and go to lunch

 

What Slow_Cvc means is that if you dont have a reason to release exhaust out faster then you have no reason to run without a cat.

Keep the cat.

 

It was way louder and gas sucked. White smoke came out of my exhaust too. But I had fun though with my test pipe.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Luserkid &raquo;</TD></TR><TR><TD CLASS="quote">What Slow_Cvc means is that if you dont have a reason to release exhaust out faster then you have no reason to run without a cat.

Keep the cat. </TD></TR></TABLE>




Big cams, High compression

 

i dunno where u guys are getting your information, with a test pipe, you actually get better gas mileage, maybe not noticeable, but you do. Reason is there is less resistance in your exhaust flow, and as a result, the engine is put at a slightly lower load on the engine.. which results in a slight increase in gas mileage. I've had test pipes and cat, and i do notice it... very slightly.

 

your exhaust only flows as well as its weakest point. Don't bother with a test pipe on stock exhaust. it probably is only .3 hp gain on a stock setup. if you have a good header and cat back exhaust, then it may be worthwhile. IMO, don't even consider it if you live in cali.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mingbling96 &raquo;</TD></TR><TR><TD CLASS="quote">i dunno where u guys are getting your information, with a test pipe, you actually get better gas mileage, maybe not noticeable, but you do. Reason is there is less resistance in your exhaust flow, and as a result, the engine is put at a slightly lower load on the engine.. which results in a slight increase in gas mileage. I've had test pipes and cat, and i do notice it... very slightly. </TD></TR></TABLE>

where do you get your info from? the reason gas mileage is worse is because the o2 is reading differently than it would with a cat, so the ecu thinks it needs to add more fuel. it has nothing to do with the load on the engine.

 

you get better gas mileage.. yr o2 sensor is positioned right before the cat, so it won't affect the o2 sensor much, if any at all. Would you agree that a free flowing (new) cat would give you better gas mileage than one that is clogged? and a test pipe flows better than a new cat. In terms of the o2 sensor, it won't care if you have a cat or not, but how well it flows.
i have a test pipe on my civic with a stock gsr motor, and i routinely get 300 miles per tank.. so in that sense, it's definately not hurting my gas mileage.

 

hmm its OBVIOUS it will, just headers will decrease you mph, mine dopped almost 3 mhp, well with my test pipe i guess it is 3. BUT anyway you will feel increase in power, but as I said exchange power for fuel GL on decision!

 

wow what an old thread by me. well i dont have a stock exhaust anymore. i have a greddy evo catback and i will we swapping this summer and getting a header so i will probably get one anyways after i swap and finish with all that