Manual Boost controlling a 850 Turbo wagon
#41
#42
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Seriously, I have hit the end or limits of the 15G. I am four turns out, IPD ECU which kills the fuel cut off. Then that was not enough so I put in a MBC and set it to 15psi. That turbo is absolutely maxed out. You can feel there is nothing left. The car litterally peaks and hangs right at that point. The turbo cannot push any more through. At 16psi there is nothing, no improvement. At 15psi the boost pegs then sets back at 14.5psi.
What I am trying to say is go with 14psi and feel confident your at the max. Any more and you will hit fuel cut off(which is very frustrating as well as very startling). If you want anything more out of the car you will have to change the turbo and exhaust.
What I am trying to say is go with 14psi and feel confident your at the max. Any more and you will hit fuel cut off(which is very frustrating as well as very startling). If you want anything more out of the car you will have to change the turbo and exhaust.
#46
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You decide what you want to run. Its an automatic I presume so the spike between 'shifts' really does not happen.
We can only suggest, you will have to find your happy place. Here you have two people running their volvos at 14psi and me at 15psi. Both have found their happy place without issue. Because of what I have personally seen with the limits at 15psi I would recommend Techs setting of 14psi. If for some reason you hit fuel cut off then drop it to Gilber33 recommendation of 13psi.
I think with all these recommendations you should have a good understanding of what to look for or expect as you get closer to these settings. For now, get yourself a boost gauge, install your MBC and start playing.
#47
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My mechanic made me worry a little today...he told me start saving money cuz the MBC will cost me lots of money since its an old car. Is it possible to blow out the head gasket at like 12-13 psi? My car has 207000km on it...think there's a possibility of damaging the engine since it has high mileage?
Is it necessary to have an aftermarket exhaust/intake? Would a K&N air filter be sufficient as an air intake? lol
Is it necessary to have an aftermarket exhaust/intake? Would a K&N air filter be sufficient as an air intake? lol
Last edited by 850T5M; 02-26-2010 at 11:33 AM.
#48
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My mechanic made me worry a little today...he told me start saving money cuz the MBC will cost me lots of money since its an old car. Is it possible to blow out the head gasket at like 12-13 psi? My car has 207000km on it...think there's a possibility of damaging the engine since it has high mileage?
Is it necessary to have an aftermarket exhaust/intake? Would a K&N air filter be sufficient as an air intake? lol
Is it necessary to have an aftermarket exhaust/intake? Would a K&N air filter be sufficient as an air intake? lol
![Confused](https://volvoforums.com/forum/images/smilies/confused.gif)
Once again, your car should be fine. Yes the possibility is there of raising boost without a tune. People have bent rods on a stock motors with a MBC and a tune, it's always a possibility, even on a completely stock motor it's possible, and when you start playing with it, the chances increase.
Read THIS before you do anything.
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