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Old 03-15-2019, 10:36 AM   #1
Fa182
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Default 940T: Adjustable cam gear to bring powerband down?

940T, 16T turbo @ 13psi, stock T cam.

Quick background, I don't really rev the engine past like around 4.5k - 5k max. most of the time, so I'd really like to have the powerband sitting a bit lower.

Would it be feasible to install an adjustable cam gear in this case with advanced timing or does this not make sense? Turbo kicks in @ around 2.3-2.5k with full boost.

I'm a total noob in this area, so thanks and apologies if covered elsewhere.
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Old 03-15-2019, 10:40 AM   #2
NotSoFresh
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You might move the power some, however a turbo needs air to move and rpm=more air faster. It is hard to get a turbo to spool fast at rpms under the 2200 rpm full spool you mentioned without finding a way to get more air through the engine.
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Old 03-15-2019, 10:45 AM   #3
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Thanks. Let me allow to rephrase, I know the turbo won't build up sufficient pressure under 2.2k - 2.5k rpm and I'm not looking to change this, I just want to have the max powerband between this area and the mentioned 4.5k to 5k.

Is it worth a try or is the difference negligible?
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Old 03-15-2019, 11:01 AM   #4
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Your powerband will suffer all around. If you want more bottom end you will need a modern car with a twin scroll turbo, vvt, and variable lift.

At any rate, nobody is home above 5000 rpm in a B230 that's nearly stock.
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Old 03-15-2019, 11:03 AM   #5
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UNless someone already swapped it, it should have the T cam, and the 'T' pretty much stands for 'Tractor'. Just leave it be.
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Old 03-15-2019, 11:10 AM   #6
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Gotcha, thanks. I'll leave it be. I'm happy how it is, just wanted to get some opinions.
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Old 03-16-2019, 09:55 AM   #7
dl242gt
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Have you tried any performance chips? A slightly more aggressive off boost timing curve may help low rpm response. I do use an adjustable gear on my n/a 93 wagon. The advance on the cam seemed to help a little but it isn't a huge difference.
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Old 03-16-2019, 02:33 PM   #8
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I'm already running TLAO chips, yes. The cost for a gear probably outweighs the benefit, so I'll leave it.
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Old Yesterday, 07:53 AM   #9
aristg
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It may be a stupid thing to say, but instead of messing with the engine, why don't you mess with ring and pinion combo ? Or gearbox ?
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Old Yesterday, 07:57 AM   #10
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I don't want to mess with the diff or gearbox or anything like that. Don't get me wrong, I love my car as it is and there is no absolute need to change something, I was just asking some opinions for a simple modification. If it works it works, if not and doesn't make sense, then I'll just leave it be.
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