What Size Exhaust Tubing for how much boost? (1.8) - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 12-21-2012, 05:05 PM   #21
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FM 2.5" DP + old (~ 2002) FM 2.5 midpipe & muffler (with ceramic cat) vs FM 2.5" to 3.0" and (current-gen) full 3.0" exhaust:

Different dynos (both the same model of dynapack, tho), and ~ 10 kpa less boost with the new exhaust, which explains the lower torque in the midrange. (sorry, the boost controller isn't as consistent as I wound like). The increased spool and top end is very evident, however.



Sorry about the colors, I blame the dynapack software.

--Ian
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Old 12-21-2012, 05:19 PM   #22
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Very deep though. ***** deep

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a Choad, Short as possible...
So not actually all that deep.
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Old 12-21-2012, 06:03 PM   #23
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For turbo exhaust you want a Choad

Short as possible and wide as possible.

My 4" isnt that loud. Very deep though. ***** deep
yeah ok.

that's why you said literally the exact opposite multiple times in your threads
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Old 12-21-2012, 06:05 PM   #24
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Quote:
Originally Posted by codrus View Post
FM 2.5" DP + old (~ 2002) FM 2.5 midpipe & muffler (with ceramic cat) vs FM 2.5" to 3.0" and (current-gen) full 3.0" exhaust:

Different dynos (both the same model of dynapack, tho), and ~ 10 kpa less boost with the new exhaust, which explains the lower torque in the midrange. (sorry, the boost controller isn't as consistent as I wound like). The increased spool and top end is very evident, however.

[img]http://www.codrus.com/dyno/agp/ian-power.png[img]

Sorry about the colors, I blame the dynapack software.

--Ian
lol spool

I think you mean flow.

But yeah, that shows the results perfectly: faster spool and more topend flow. And you can easily bump boost in the midrange as well as timing and make way more torque and be less det limited.

This is one of those rare times I agree with Fae: the bigger and the shorter, the better.
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Old 12-21-2012, 06:14 PM   #25
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yeah ok.

that's why you said literally the exact opposite multiple times in your threads

well fine it is louder than god but loudness increases with the amount of air being pushed through your engine.

I also have a muffler through which you can roll a tennis ball. that enloudens it
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Old 12-21-2012, 08:13 PM   #26
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I also have a muffler through which you can roll a tennis ball. that enloudens it
Shouldn't that technically "delouden" it?
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