Quote:
Originally Posted by Irace86.2.0
The stock MAP sensor can’t read past like 5-6psi of boost. If your tuner is tuning off the stock MAP sensor then that is a problem. Most likely they are tuning off the MAF sensor. If the tune is a hybrid tune that switches to the MAP sensor at high rpms or is purely off the MAP then that is likely the problem.
The stock MAP sensor is rated to read 1.67bar, which in absolute terms is 24psi, but that isn’t 24psi of boost because 1bar of that is atmosphere. It would be like 9psi of boost, but the sensor really can’t function well at the limits, so I believe it tops out around 5psi of boost or at 1.37bar (19.87 absolute psi) before it breaks up.
https://ecutek.zendesk.com/hc/en-gb/...sor-Re-scaling
You could be boost spiking past 7psi to the limit of the MAP sensor of 9psi, but breaking up past 5400rpms because the MAP sensor is being pushed beyond 5psi of boost that is too close to its limits to read well.
Either you are confused, or they don’t have much experience tuning this platform. Make sure they do know what they are doing, and buy a 3-4bar MAP sensor. I don’t know what you plan to make for power or plan to raise your boost to, but you always want to leave room away from the limit of the MAP sensor. You could buy a 1bar MAP sensor that reads up to 2bar absolute or 14.7psi of boost, but it really shouldn’t be pushed past 11psi, boost spikes considering, so just get a big MAP sensor and have them scale appropriately. That should fix your problems. |
Yeah I'm new to boost so I'm just going off what they're telling me. I'm taking it to a new tuner sometime this week so hopefully they'll have some better insight into what's happening there. The guys I took it to before were recommended as the best Subie guys in the area, but
