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Old 12-05-2009, 09:21 PM   #1
bmw_chuzo
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AA supercharger help

hello.
I just finished intalling my c38 kit, its amazing!

The problem that I have is that when pressing the throttle very agressive sometimes the car will hesitate and throw backfires. Also between shifts the engine will lag a little bit. What could be the causes of this?
I don't have any error codes, and the car idles perfect around 900 rpm and adaptations were cleared

thanks
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Old 12-05-2009, 09:39 PM   #2
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vacuum leak somewhere.
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2000 328i - Custom Turbo tuned by AA

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Old 12-05-2009, 09:52 PM   #3
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Quote:
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vacuum leak somewhere.
Do you think so? The hoses where pretty tight but I will check tomorow again

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Old 12-06-2009, 07:26 PM   #4
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Quote:
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Do you think so? The hoses where pretty tight but I will check tomorow again

I would also smoke test everything it will make figuring out your leak much faster.
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Old 12-07-2009, 12:38 PM   #5
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how?
I also intalled a boost gauge and it starts to get boost aroung 3k rpm+ up to redline. The hesitation has stopped for now but I still get a lag between shifts.
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Old 12-07-2009, 12:46 PM   #6
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I have some lags between shifts as well.. so im curious..
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Old 12-07-2009, 12:49 PM   #7
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What exactly do you guys mean by lagging bewteen shifts?
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Old 12-07-2009, 01:06 PM   #8
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Guy's adjust your Bypass Valves... I had to adjust mine quite a bit.
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Old 12-07-2009, 01:35 PM   #9
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how do we do it Denny?
Turning the screw that is on top? I'm a total noob in FI
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Old 12-07-2009, 01:41 PM   #10
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how do we do it Denny?
Turning the screw that is on top? I'm a total noob in FI
Very easy ...you loosen up the nut few turns that holds the screw on top of the Bypass valve then you clockwise turn the screw ( I think its 5 full turns over factory setting ) for me..you will have to drive and see how it feels when you shift. Hope this helps...

One device that took out the lag from the ETC/pedal response (BMW's suffer from serious lag of the pedal) is the sprintbooster ...every bmw should have one of these... especially with the added drag of the Supercharger.
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Old 12-07-2009, 08:53 PM   #11
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Denny,
I just did it but nothing changed. well (maybe a little better), also the valve or blower is a little more louder now, sounds cool.

The problem that I have is that when I downshift or shift fast there is a little hesitation or lag and sometimes it throws a backfires when I quickly press the throttle

The car is fast!, no errors or anything I just know that is not running 100%
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Old 12-07-2009, 08:57 PM   #12
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AA have anything to say about adjusting the bypass valve? I was under the assumption that it was adjusted to spec from them.
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Old 12-08-2009, 07:33 AM   #13
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Denny,
I just did it but nothing changed. well (maybe a little better), also the valve or blower is a little more louder now, sounds cool.

The problem that I have is that when I downshift or shift fast there is a little hesitation or lag and sometimes it throws a backfires when I quickly press the throttle

The car is fast!, no errors or anything I just know that is not running 100%
Take a pic of your BPV and post it I want to compare to mine and see how much you adjusted.

I have already talked to AA about it and the lag is caused by added parasitic drag on the belts by the Supercharger and like I said BMW have very laggy ETC stock so now it accentuates it more with the SC. My solution and it works awesome like I said is the sprintbooster.... its no gimmick...it works.

For the backfire it could be a host of things (air leak, bad coils..etc.) making the car run rich on accel,,making the unburned gas blow up in your exhaust.
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Last edited by dennymedeiros; 12-08-2009 at 07:36 AM.
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Old 12-08-2009, 08:47 AM   #14
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here is a pic.

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Old 12-08-2009, 08:47 AM   #15
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Btw if you adjust the BPV too tight you might crack your manifold. The pressure inside the manifold has to be released...
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Old 12-08-2009, 10:10 AM   #16
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In your pic it looks like you did not lock down the nut.

Here a pic of mine.

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Old 12-08-2009, 10:11 AM   #17
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Btw if you adjust the BPV too tight you might crack your manifold. The pressure inside the manifold has to be released...
You Sir are 100% wrong...

My car at idle is seeing 20in/hg of vaccum which is the same as stock which means the BPV is releasing on idle no problems. With my BPV setting boost sets in a little quicker on part throttle giving more low end power for everyday street driving
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Last edited by dennymedeiros; 12-08-2009 at 10:15 AM.
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Old 12-08-2009, 10:14 AM   #18
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I have already talked to AA about it and the lag is caused by added parasitic drag on the belts by the Supercharger and like I said BMW have very laggy ETC stock so now it accentuates it more with the SC.
Strange, only noticed a minimal amount of parasitic drag perhaps 10% but no increased throttle lag. No different to the ess N/A remap which was great.

Expecting a bit of added delay with the intercooler and smaller pulley - (if I ever manage to get it fitted )
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Old 12-08-2009, 10:19 AM   #19
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Strange, only noticed a minimal amount of parasitic drag perhaps 10% but no increased throttle lag. No different to the ess N/A remap which was great.

Expecting a bit of added delay with the intercooler and smaller pulley - (if I ever manage to get it fitted )
mmmm...interesting. I heard somewhere that the Europe version BMW's had a more accurate ETC from factory!!

With the smaller pulley and very efficient bar and plate intercooler from AA u should have faster boost then level 1...

Hows the install going with level 2?
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Old 12-08-2009, 11:46 AM   #20
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Hey Denny - Install is nearly complete, but very tricky compared to stage 1. A certian amount of initiative and patience is required but thats expected considering the little room we have to work with in the engine bay.

Currently have a problem with snail pipe alignment, not sure If I have been sent the wrong part or not. David (Activ3) is very kindly helping me out with this over PM.

Can't wait to jump back in my car, I have not driven it for nearly a month!
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