Boost Issues
02-19-2017, 11:53 AM
#23
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Taking the differences of the two engines out of the equation, isn't the "problem" presented here par for the course with MBC's? A pressure peak then settles to slightly below? Where, if you want constant 20psi, it'll probably crack the MBC open at 22-24 then settle at the desired setting?
02-19-2017, 11:53 AM
#24
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I may have some extra back pressure, but I was still able to make more power with the larger motor and same hot/cold side. We are going to be looking for a leak on Monday.
02-19-2017, 11:56 AM
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Taking the differences of the two engines out of the equation, isn't the "problem" presented here par for the course with MBC's? A pressure peak then settles to slightly below? Where, if you want constant 20psi, it'll probably crack the MBC open at 22-24 then settle at the desired setting?
03-05-2017, 11:12 AM
#33
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We have resolved the boost taper by again replacing the wastegate spring with a new 18 lb spring from Precision. It holds 17-18 psi on gate alone, but all is not well....
We turned up the boost and then my ignition was breaking up. New plugs with a tighter gap and new wires fixed this breaking-up, but..
It will not make any more power than 680ish regardless of boost pressure. It is not showing any knock or pulling timing. There is no way that this turbo is maxed out on a 346, right?
We turned up the boost and then my ignition was breaking up. New plugs with a tighter gap and new wires fixed this breaking-up, but..
It will not make any more power than 680ish regardless of boost pressure. It is not showing any knock or pulling timing. There is no way that this turbo is maxed out on a 346, right?
03-05-2017, 12:06 PM
#34
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We have resolved the boost taper by again replacing the wastegate spring with a new 18 lb spring from Precision. It holds 17-18 psi on gate alone, but all is not well....
We turned up the boost and then my ignition was breaking up. New plugs with a tighter gap and new wires fixed this breaking-up, but..
It will not make any more power than 680ish regardless of boost pressure. It is not showing any knock or pulling timing. There is no way that this turbo is maxed out on a 346, right?
We turned up the boost and then my ignition was breaking up. New plugs with a tighter gap and new wires fixed this breaking-up, but..
It will not make any more power than 680ish regardless of boost pressure. It is not showing any knock or pulling timing. There is no way that this turbo is maxed out on a 346, right?
So the tuner has all the information to hand to test whether the turbo will make any more power than that. Boost pressure is only one aspect
03-05-2017, 12:10 PM
#35
We have resolved the boost taper by again replacing the wastegate spring with a new 18 lb spring from Precision. It holds 17-18 psi on gate alone, but all is not well....
We turned up the boost and then my ignition was breaking up. New plugs with a tighter gap and new wires fixed this breaking-up, but..
It will not make any more power than 680ish regardless of boost pressure. It is not showing any knock or pulling timing. There is no way that this turbo is maxed out on a 346, right?
We turned up the boost and then my ignition was breaking up. New plugs with a tighter gap and new wires fixed this breaking-up, but..
It will not make any more power than 680ish regardless of boost pressure. It is not showing any knock or pulling timing. There is no way that this turbo is maxed out on a 346, right?
