Muffler delete pipe = extreme temps at tailpipe??

[twincamRob]

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[mike2100]

Weird indeed. It looks like your tip extends out even further than the stock tips, which would rule out the extra heat coming from exhaust gasses exiting the pipe.
What type of metal did you use? I wonder if it holds more heat than the stock exhaust's metal, or that used by typical aftermarket companies.

[xjohnx]

Originally Posted by mike2100

Weird indeed. It looks like your tip extends out even further than the stock tips, which would rule out the extra heat coming from exhaust gasses exiting the pipe.
What type of metal did you use? I wonder if it holds more heat than the stock exhaust's metal, or that used by typical aftermarket companies.

it's definitely hot. apparently this was after 120 seconds of axleback delete with no straightpipe

[ayau]

yeah, i guess it's not surprising to see higher temps from a simple straight pipe.

the stock muffler is basically a giant heatsink. larger surface area = heat is spread out more.

making the pipe longer (increase surface area) and aiming it downward might help in saving your bumper.

[mike2100]

time to break out the header wrap?

[ayau]

Originally Posted by mike2100

time to break out the header wrap?

that would just increase the temps even more because you're trapping the heat.

[xjohnx]

Originally Posted by mike2100

time to break out the header wrap?

i'd just weld up some longer exhaust hangers.

[mike2100]

Originally Posted by ayau

that would just increase the temps even more because you're trapping the heat.

Well you could insulate the tip from the bumper at least. It would look funny

[serialk11r]

Could be an aerodynamics thing. You're injecting exhaust gas into the wake of the car, so it's expected that it could come around and linger around the bumper. Removing the muffler interferes with the airflow under the car too, and that could be causing more heat to reach the bumper too.

Seems very unlikely that the heat is getting there via radiation off the pipe, so maybe try extending the pipe an inch or two, and attaching a piece of coroplast or something to the bottom as a temporary diffuser.

[d1ck]

Try putting on an exhaust tip, they act as a heat shield.

[bimmerboy]

wow seems like that high compression really affects EGTs... I would maybe use a larger diameter pipe and angle it down so the exhaust is flowing away from your bumper..

[simpleisbest]

I have the Nameless exhaust delete installed. No problems so far.
I think it extends a bit further out than the one you made.

[Reason]

To apply Occums Razor on both points

The steel you're using might be radiating more heat than the stock pieces (and as mentioned, would be less of a heat sink with far less surface area, too)

For the paint;t your can of paint has either gone bad, or reacted in a way it normally wouldn't.


Thats just my theory.

[Xanatos]

Boy you'll be spitting some flames with this!

I have a feeling this has to do with pressure/flow. With the stock exhaust you have two outlets so the heat from your exhaust is spread out and you cut the exhaust flow in half. I don't know if you still have enough scrap but I would try a whole new tailpipe with a 2nd outlet on the other side like stock.

That's my guess at least. Toyota/Subaru spent all this time developing a lightweight car I would think they would have removed a 2nd exhaust if they could get away with it.