MS3X A4 1.8T Quattro Running and partically mapped

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prof315
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Re: MS3X 1.8T got trigger signal, but fuel pumpt not running

Post by prof315 »

Drunken_M wrote:I fired the car now with the 630cc injectors, it worked ok.
But, when the rpm is between 7-800rpm, and 1200rpm and i hit the gas, sometimes the rpm goes to 0rpm for a sec and then reads correct again, and it pops in the exhaust of course. Could this be a tuning/software issuw, or just some problems with the signala from the vr or cam?
Sounds like a possible sync loss. Post up a datalog and msq
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Drunken_M
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Re: MS3X 1.8T got trigger signal, but fuel pumpt not running

Post by Drunken_M »

I will post a log and the msq when im home again tonight.
But i will redo all the bad wiring first, but is there any good explenation to why i dont have trigger reading when i mount the side covers on the ms3 box?
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Re: MS3X 1.8T got trigger signal, but fuel pumpt not running

Post by billr »

"Bad wiring" is a good explanation for most any problem! Get that fixed first, let's see if the triggering issues go away after that.
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Re: MS3X 1.8T got trigger signal, but fuel pumpt not running

Post by Drunken_M »

Ive wired it all with good wires and real soldering. But still the same problem, i tried to solder in the 1kohm resistor from 5v to vrin. Then i had to adjust the r56 pot again, and the sync problem was not there anymore, i tought. The problem now appears at 3000rpm instead.
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Re: MS3X 1.8T got trigger signal, but fuel pumpt not running

Post by Paul_VR6 »

Can you get a tooth log of a rev up there? The stock sensor on that motor, both pots fully ccw should have no sync problems past 9600rpm.
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Drunken_M
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Re: MS3X 1.8T got trigger signal, but fuel pumpt not running

Post by Drunken_M »

I have made some logs, but i dont need to post them, i just tried in one last attempt to change vr sensor polarity, and guess what? No more sync problems and car is running great :)
I guess all the info i got on the aeb 2 connector ecu was not correct on the vr sensor polarity.
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Re: MS3X 1.8T Running and partically mapped.

Post by T3Bunny »

Glad to hear it! Safe tuning, and please post updates! Video?! :mrgreen:
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Drunken_M
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Re: MS3X 1.8T Running and partically mapped.

Post by Drunken_M »

Thanks T3Bunny, car is running fine now. Just have to do some fine tuning and ignition timing on the dyno, but i have to wait until my 4bar map sensor is mounted.
I will try to make a video when its finished, but i can post some pics of the car now though :)
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And a bad video of some turbo flutter :)
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