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Discussion Starter #1 (Edited)
I dyned my 3.6 this weekend

Fuel: Petrobras Podium gasoline (95 Ron + Mon 25% alcohol)
800 meters above sea level
25ºC

Very worried with the results as dyno showed overfueling in higher revs. Very low power. Tried to remove the air filter and lost more than 10 HP, and the car was overfueling even more.

Any advice ??? I compared my plot with some other M5 and mine was the worst.
The car is totally stock with paper air filter and cats on.

Really need advice... PLEASE >>> WANT MY POWER BACK
 

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Discussion Starter #2
Any advice ????????

Yesterday I found a vacuum leak in my manifold one of that rubber cap near the throtle body were missing. There were only 5. Can it make any improvement ???

I need advices here ... no one ???
 

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Discussion Starter #3
ANYADVICE ON THE LOW POWER ???:grrrr:
 

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The loss of power could be down to hundreds of reasons and any we give will be purely speculation. It could be due to temperature, fuel, fuel supply, wheel slip on the dyno, altitude, clutch damage, etc.
 

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Discussion Starter #5
Things that I tought:


Spark plug
Lambda Probe
I found a small vacuum leak near one of the butterfly
Clean MAF( But I heard that it makes the car lean)
Would a dirty injector cause overfuel ???
Fuel press regulator. ( I have a late one 3.5 bar can It be used?)
 
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