e36 325i - All this blood and sweat for 172 horses =[

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  1. e36 325i - All this blood and sweat for 172 horses =[ 
    #1
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    Just been to dyno my car. The current list of mods is US Spec 3ltr M3 cams, Big bore Throttle Body, Decat, M3 Backbox and a fart valve. On an M50B25

    And the dyno shown 172.8 HP The fuel map shown that the car is running wayyyyyy too lean! And it is very very lumpy. Has a massive dip at about 4.8k revs and the max torque is 166 ft/lb.
    Rather pittyfull to be honest. Altho the peak was at 6080 rpm
    Any suggestions? But the AFR is rediculas. It goes up to 15.2 at 2500rpm and then drops all the way to 13
    Will upload the pics of the graphs a bit later.
     
     

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    I would advise a diagnostic scan to see if there are any fault codes recorded on the ECU.

    I would also check all air pipes for splits/leaks.

    Are you aware of when the lambda probe/s were last replaced?
     
     

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    The lamba probe was replaced last summer when i don the conversion. But wont the fact its running to lean mean its getting plenty air and not enough fuel? I will upload both printouts but the fella in the shop said that it could be a number of different things. But what he said since its running that lean it just wont let the timing to advance properly.
     
     

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    Was wondering, could it be because the fuel regulator cant cope? So, basicly would increasing the fuel pressure sort this out?

    And how much am I looking at for an OBD scan to see if there is any errors?
     
     

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    The 13:1 AFR is about where max power would be made, so you have a massive restriction somewhere and you really need tuning done on the car.
     
     

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    Any idea what it could be? I had the injectors sent away for cleaning before the engine went in. And they were tested at 50% duty cycle and kicked out 46cc
    Im gona try and see if I can get it pluged into the OBD scanner at my mate's garage.
     
     

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    46cc @ 3bar and 50% duty cycle?
    That doesn´t sound right at all.

    That´s way to low.

    It´s starving for fuel at least that´s a given. but even though you should be seeing more power up top with that AFR up top.
     
     

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    Yea, thats what they were tested at. And that was tested with V-power. Thats all I ever run. Seems a lot happier with that petrol, never used octane booster in it as I read and people say that it doesnt seem to do much.
    I just thought about trying the 323 injectors from the other car just to see if I see any performance improvement because Im letting my dad use it at the moment and it seems to be pretty poky. And that the 323 injectors are same as 325. Would the US spec M3 cams have anything to do with this or the decat? I noticed on the graph that the peak power has shifted from 5900 rpm aswell.
    Or maybe try increasing the fuel pressure?
     
     

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    What is the mixture like during cruise?

    I´d replace the injectors with the correct ones or marginally larger.
    And definitely get it remapped.

    And those injectors should not be flowing 45cc@3bar , I´d say the test was wrong as they are supposed to flow alot more.
     
     

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    Thats the problem, I got no way of monitoring my fuel mixture at the moment.
    I was thinking of putting them 323 injectors on just as a check because that car seems to be running rather well. But also thinking about 328 injectors as they are Bosch aswell. But the question is, would my ECU be able to adapt if I put the 328 injectors on?
     
     

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