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Old 06-29-2011, 10:05 AM   #1
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Default how much boost for say 200lbs/ft of torque

Hi, i'm running a 1.8 NA mx5 with a T25 (.48) turbo, 460cc low imp injectors, adaptronic management etc etc and i'm currently running 10psi of boost.

I just wondered what amounts you guys have safely run on a T25 and what kind of boost i'd need to be running to produce 200lbs/ft of torque or as close to it as possible.

thanks in advance
Tom
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Old 06-29-2011, 10:20 AM   #2
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~10psi
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Old 06-29-2011, 10:36 AM   #3
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what kinda psi = bhp/torque are you running scott?
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Old 06-29-2011, 10:53 AM   #4
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On a .49a/r T25 you won't make 200wtq. On a .64a/r T25 with a 60mm or larger compressor, you'll need at least 12psi to hit the 200wtq mark.

Note that's wtq - you can make 200whp on the .49a/r turbo at ~15psi.
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Old 06-29-2011, 11:22 AM   #5
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I'd say 10-15psi depending on the timing map
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Old 06-29-2011, 11:29 AM   #6
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Quote:
Originally Posted by pusherman View Post
what kinda psi = bhp/torque are you running scott?

It takes a bit more on my turbo and smaller motor.


this is my t3 on my 1.6L running 10psi vs a 94 motor running a .84/.64 t25 at 10psi.


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Old 06-30-2011, 08:10 AM   #7
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good times, cheers for the replys all.

I'm just road mapping the car and may increase boost a little to 12psi and start addressing the timing map and see where I go from there.
cheers
Tom
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Old 06-30-2011, 09:28 PM   #8
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I recently turned up the boost from 10 to 12 psi on my 99. Haven't been on dyno yet but the jump from 10 to 12 makes a huge difference in power! I think I found the sweet spot for the 2854 churbo.

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Old 07-01-2011, 04:34 AM   #9
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oo nice... well i'm gona get it through the MOT then and then try and wind it up a bit
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Old 07-01-2011, 05:36 PM   #10
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Quote:
Originally Posted by flounder View Post
i recently turned up the boost from 10 to 12 psi on my 99. Haven't been on dyno yet but the jump from 10 to 12 makes a huge difference in power! I think i found the sweet spot for the 2854 churbo.

2854?
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Old 07-01-2011, 07:36 PM   #11
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It's from the begi shanghai kit.
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