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restrictive exhaust Qs
by
veector
on 13 Jan, 2010 07:27
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I purchased and installed a giles superpump on my aaz along with a boost controller to get that k14 spinning 18-20lbs on full throttle. Now i've still got the stock exhaust which was put in recently by the previous owner. Downpipe, resonator mid muffler and end muffler. That seems like alot holding back that exhaust pressure... Would i benefit from deleting a few mufflers or would i need something else?
Thanks,
Vic
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#1
by
8v-of-fury
on 13 Jan, 2010 08:45
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Turbo, resonator, mid muffler and end muffler!? holy cow
The turbo itself acts as a huge restriction.
I think if you were to 2.25-2.5" turbo back and just have an end muffler, you would notice a giant increase in performance.
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#2
by
vanbcguy
on 13 Jan, 2010 08:50
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Yeah, even just the weight of the stock exhaust system is a limitation in itself - the "suitcase" resonator under the back seat is pretty heavy and absolutely unnecessary.
I put a Magnaflow cat-back on my gasser, it worked great. It was a 2.25" though, so I left it on the car when I sold it. Noticeable difference on the gasser, so I'd imagine the diesel would like it even better!
Does your car not have a cat on it?
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#3
by
burn_your_money
on 13 Jan, 2010 10:09
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If you still have the cat then loosen off the 3 bolts so there is a huge leak there and take it for a spin an see if there is any difference. You should locktight the nuts on so they don't fall off and cause your exhaust to fall.
You'll get the bottom of your car sooty and dirty though.
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#4
by
veector
on 13 Jan, 2010 15:49
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No cat on my car so i think im going to have a straight pipe made from the downpipe and exit in front of the back wheel. Would i be killing my back pressure by doing that? Most likely il have something fabbed up with just one end muffler
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#5
by
burn_your_money
on 13 Jan, 2010 16:23
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No back pressure is required since you have a turbo.
Look into upgrading the downpipe (custom) too if the pocket allows.
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#6
by
veector
on 13 Jan, 2010 19:32
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Heh goes to show how much i know so i could run a straight pipe
I've got a good exhaust guy who im sure could fab up a custom downpipe. What would be a decent size? 2 1/2, 2 3/4?
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#7
by
RadoTD
on 13 Jan, 2010 20:26
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Heh goes to show how much i know so i could run a straight pipe
I've got a good exhaust guy who im sure could fab up a custom downpipe. What would be a decent size? 2 1/2, 2 3/4?
With 20lbs of boost, I'd go at least 2.5".. more likely 3" from the turbo the whole way back
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#8
by
dyoungen
on 13 Jan, 2010 21:52
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Back pressure is nessary on gassers but not Diesels. The better the Diesel breaths, the better she runs.
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#9
by
veector
on 14 Jan, 2010 05:26
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awesome great info guys im sorta new to the diesel world. Il be looking into a 3" dp then
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#10
by
veector
on 22 Jan, 2010 19:23
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Just spoke to my exhaust guy and he'll be fabbing up a 3" downpipe with flex hose, along with a side exit by the back wheel. Straight through
Very good pricing too if anyone is looking for an exhaust guy in the west end of Toronto
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#11
by
MouseGTD
on 23 Jan, 2010 11:28
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i made mine myself, only cost me 40 pounds for the piping
i couldn't believe how thin the original down pipe was on mine
standard
after
3" all the way, made a massive difference and makes a great noise when you let off the throttle
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#12
by
Rabbit on Roids
on 24 Jan, 2010 08:32
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#13
by
MouseGTD
on 24 Jan, 2010 09:15
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well it sounds nice on a turbo
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#14
by
the caveman
on 24 Jan, 2010 10:51
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Back pressure is nessary on gassers but not Diesels. The better the Diesel breaths, the better she runs.
But does that apply to non turbo's ?