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Old 02-09-2015, 11:57 PM
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Boost Increase on a 50i?

Is there a simple way to increase the boost of couple of psi on a 2011 with the 50i motor? I know all the other turbo cars I've ever had you could.

I was thinking maybe adding a small spring to the wastegates or adding washers behind the wastegate mounts or something simple like that. I'm not a gorilla but I also don't want to spend $1000 for nothing.

Also, is there any way to check my boost pressure?
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Old 02-10-2015, 12:31 AM
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Burger Tuning has a kit.

Burger Motorsports Official Website | BurgerTuning.com
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Old 02-10-2015, 01:14 AM
ard ard is offline
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Im guessing that is WAY too pricey....
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Old 02-10-2015, 03:43 AM
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Yeah they are cheaper than most and it may come to that but I was hoping there was a way to mechanically "trick" the wastegates to allow more boost.

I bet you can bleed off a bit of the boost pressure sent to the ecu with an accurate regulator. I think even though the ECU would not be aware of the actual boost pressure it would still add fuel because the mass air sensors would know there was more air being added. This would require a boost guage obviously to avoid detonation from overboost.

Does anyone use alcohol injection to prevent detonation from high boost pressures yet? That would be the next step.

My old Buick Grand National started out with running 14psi (245HP) back in 1987 and now we're all running 28psi (600HP) with no trouble. My point being, these X5's could be ridiculously fast with a little tinkering.

Last edited by sethhatfield; 02-10-2015 at 04:17 AM.
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Old 02-10-2015, 09:41 AM
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I wouldn't recommend just pushing more boost without tuning for fuel and air to allow more boost. Otherwise you are just asking for trouble, get a proper tune with a boost increase or let the engine fail. Only choices you have.
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Old 02-10-2015, 10:46 AM
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Unlike the GN running 11-12 AFR under boost, these engines are very efficient and running in 13s. A little deviation in the actual pressure to what the DME see may easily put it it in the 14s and you really dont want that. Of course the DME is smart enough and have at least a few more failsafe channels to protect the engine, but bottom line is you can actually loose power trying to mess with the boost. Things just doesnt work this way in the 21st century. But even when we were messing with the old turbo 745s from the 80s, they were smart enough to figure out if boost deviates with more than 2-3 psi and cut the injectors. Even if you disconnect the MAP(pressure sensor) at all.
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Old 02-10-2015, 10:47 AM
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Good way to void the recall/owner goodwill coverage of the N63 motor.

A mod like this will have YOU paying for a new motor should it fail.
'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!
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Old 02-10-2015, 12:40 PM
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even if you did get it to overboost by putting more resistance on the opening action of the wastegate that wouldn't really matter as boost is measures in the chargepipe, the DME would limit boost based off that measurement. once it sees overboosting you would go into limp mode and need to restart the car.
$500 for a piggyback isnt alot of money, and if you find one used, you wont lose any money when you resell it.
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