EricF Posted September 29, 2009 Report Share Posted September 29, 2009 There are many determining factors as well in bending rods, but the number 1 cause is to high of boost at Low rpms.. please dont exaggerate it You are absolutely wrong, hopefully most people here know that Just FYI, I ran 22-23 peak boost on a 15G with my first 850 turbo, I would also reach those boost levels way before 3000 RPM. Never bent a rod. But it is a very strenuous situation for the engine as well as the rest of the drivetrain. Please don't talk like you know what you're talking about if you don't. Especially don't back talk me because I know a hell of a lot more than you, along with having a lot more experience than you. I try to inform, you do too, but trust me I know what I'm talking about. Most of these things I have learned the hard way so others (you included) don't have to, appreciate that /end tantrum, carry on :lol: Link to comment Share on other sites More sharing options...
EdubT5m Posted September 30, 2009 Report Share Posted September 30, 2009 why not blank off the stock cbv and throw on a bov with a recirc? Link to comment Share on other sites More sharing options...
850 LongBeach Posted September 30, 2009 Report Share Posted September 30, 2009 You are absolutely wrong, hopefully most people here know that Just FYI, I ran 22-23 peak boost on a 15G with my first 850 turbo, I would also reach those boost levels way before 3000 RPM. Never bent a rod. But it is a very strenuous situation for the engine as well as the rest of the drivetrain. Please don't talk like you know what you're talking about if you don't. Especially don't back talk me because I know a hell of a lot more than you, along with having a lot more experience than you. I try to inform, you do too, but trust me I know what I'm talking about. Most of these things I have learned the hard way so others (you included) don't have to, appreciate that /end tantrum, carry on 22 psi on a 15g is just superheated air =/ 15g is a stock turbo, we are not talking about stock turbos and yes, PSI at to low of RPM's bends rods, just because you ran 22 psi under 3k doesnt mean its safe..... I dont care if you say Im wrong, I know im right END TANTRUM You know damn well what I meant Eric your smarter than thatPS how the fck did I backtalk you? I didnt target that at you Link to comment Share on other sites More sharing options...
EricF Posted September 30, 2009 Report Share Posted September 30, 2009 22 psi on a 15g is just superheated air =/ Not at low RPM it isn't.... Sure at 5000+ RPM it's way out of the efficiency range, but not at 3000-3500. Couple in boost fade to 14 psi and you're pretty much riding an efficiency line in the compressor map. Very underwhelming to drive but not superheating. 15g is a stock turbo, we are not talking about stock turbos 19T is a stock turbo as well and yes, PSI at to low of RPM's bends rods, just because you ran 22 psi under 3k doesnt mean its safe..... Whose rods did it bend? Under what conditions? Was there audible detonation? Signs of detonation or superheating in the chamber? What did the plugs look like? The point is, about 0% of engines on Volvospeed with rods bent have had a proper post-mortem diagnosis done after the fact. Another point is, probably more than half the people on here don't even know what detonation sounds like. How many people have driven around with something wrong on their car, had detonation occur, bent a rod, then read something about "too much boost at low RPM" and then immediately blamed it on that because it sounds good to them? I dont care if you say Im wrong, I know im right END TANTRUM And I know you're wrong because based on your past posts I know you don't really know what you're talking about This is fairly advanced engine mechanics. You know damn well what I meant Eric your smarter than that PS how the fck did I backtalk you? I didnt target that at you Yeah you did, you quoted my post and said please don't exaggerate the issue, boost at low RPM is what bends rods. I am just trying to correct you so all the sheep on here don't follow your train of thought erroneously. You responded directly to me, and I'm responding directly to you. This is a significant enough issue that I'm going to make a point of hearing this out to make sure nobody leaves this thread totally misinformed. For everyone reading this: Detonation bends rods (or melts piston rings, or breaks piston ringlands, or cracks cylinder walls, etc). Detonation occurs due to improper fuel mixture or ignition timing (or both). Detonation bends rods *way* more easily at lower RPMs when the torque curve is on its way up or at the top. Once you past the peak torque in your RPM range, detonation is a lot less likely to do any serious damage. If you run a lot of boost at low RPMs and never have any detonation, you will never bend your rods. Does everyone understand this? Link to comment Share on other sites More sharing options...
FCP Euro Posted September 30, 2009 Report Share Posted September 30, 2009 I am not going to get into the "low RPM" debate but I will tell you what I am running without an issue. I am running an IPD tune with a MBC set to 16 PSI and had not issues with low RPM boost. This is on a 1994 850 T5 with 194K miles. Ok, back to the show. LOL Link to comment Share on other sites More sharing options...
850 LongBeach Posted September 30, 2009 Report Share Posted September 30, 2009 I am not going to get into the "low RPM" debate but I will tell you what I am running without an issue. I am running an IPD tune with a MBC set to 16 PSI and had not issues with low RPM boost. This is on a 1994 850 T5 with 194K miles. Ok, back to the show. LOL :facepalm: nevermind Link to comment Share on other sites More sharing options...
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