Timeing and whatnot
#4
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You could get a 12 or 14cm wastegated housing, drill the divider out so it wastegates all 6, and set it at 35-40psi with a manual boost controller and sell your 16. I would think you could get a 12cm cheap, but you might run into EGT problems, and a 14 is expensive. Just a thought
#7
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i had to advance my timing a lot to get the boost down. i was about to make 55 lbs of boost with 1/8 on the timing, now i have the pump bumped up were the pump is pretty close the the motor(cant even fit my finger between the two) and now it will top out at 39.
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#8
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Originally Posted by ihpower
i had to advance my timing a lot to get the boost down. i was about to make 55 lbs of boost with 1/8 on the timing, now i have the pump bumped up were the pump is pretty close the the motor(cant even fit my finger between the two) and now it will top out at 39.
#9
Registered User
Fear, you might want to find a way other than just timing to drop the boost, when you advance the timing the boost drops because more of the heat/combustion fire is taking place in the cylinder, that in turn cools your exhaust(lower egts) and you get lower boost because the exhaust velocity has dropped. BUT here is the kicker...your cylinder pressure`s are higher as a result, hence the increased rattle, lack of the wet dog shake at shutdown. All I`m saying be carefull, too much of a good thing...welll you know that saying. Head gaskets get kind of cranky with super high cyl psi`s. Speaking of timing...is it normal for it to sound like a 24v when the timings cranked? Mine is a shade over an 1/8.
#10
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Originally Posted by spunbearing
Couldn't you install a blow-off valve in your intercooler pipe going to your intake? Just a thought... maybe theres a reason not to do that.
#11
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Originally Posted by wannadiesel
There is. We want to reduce boost not only to protect the head gasket, but also to prevent overspeeding the turbo. If we limited boost by blowing off excess pressure, we could overspeed the turbo very easily. The purpose of a BOV is to prevent turbo stall when the throttle is closed (or the engine is defueled on a diesel). The turbo retains more speed for less lag when the driver gets back on the gas.
Makes sense.
#12
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Join Date: Aug 2004
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Thanks guys, im gonna rebuild my engine and what not when i have dead engines, by then i should have money for studs 60valve springs and a gated housing of somesorts.