16v tech question...Ignition amplifier??
11-24-2016 | 01:45 PM
#16
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It's also a huge source for electrical noise, it's basically a bunch of windings creating and collapsing a magnetic field every time the coil fires. So it's good to get it away from low power signals, like sensor inputs.
11-24-2016 | 09:22 PM
#18
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05-12-2017 | 08:03 AM
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Interesting to see the negative talk about these parts. Same units used on every 928 from 1985 - 1995 and failure is considered very rare.
Heat is usually the #1 culprit for such devices, the location in the 928 in the nose in front of the radiator may be better than where the 944S/S2 have it located.
It's recommended at some point to remove the unit from the heat sink (the bracket it's bolted to) and replenish the paste between the two. Same stuff used between a computer CPU and heat sink. Just be very, very careful removing the unit. They easily pull apart which will ruin it.
Heat is usually the #1 culprit for such devices, the location in the 928 in the nose in front of the radiator may be better than where the 944S/S2 have it located.
It's recommended at some point to remove the unit from the heat sink (the bracket it's bolted to) and replenish the paste between the two. Same stuff used between a computer CPU and heat sink. Just be very, very careful removing the unit. They easily pull apart which will ruin it.
05-12-2017 | 02:14 PM
#24
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928S4 with nearly the same head and the same chain tensioners, has no oil restrictor and the tensioner pads only ever need replacement "if you're already in there"...
so basically...your ignition modules are better oiled
05-13-2017 | 11:53 PM
#26
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Hoping someone can explain why the 944S/944S2 as well as the 928 DOHC models were fitted with an "ignition amplifier" which sometimes causes issues...
I know the whole DME was different on the DOHC cars vs the SOHC cars so I assume there is some hardware differences requiring it but functionally...the DME sends a signal which fires the ignition coil which jumps the dizzy down to the plugs and sparks.
So what is the point of the amplifier? Does it receive the hall sensor signal for more accurate timing or...?
I am in the midst of a DOHC swap into my NA car, but I am using VEMS ECU so it doesn't really matter to me, but I am still curious.
I know the whole DME was different on the DOHC cars vs the SOHC cars so I assume there is some hardware differences requiring it but functionally...the DME sends a signal which fires the ignition coil which jumps the dizzy down to the plugs and sparks.
So what is the point of the amplifier? Does it receive the hall sensor signal for more accurate timing or...?
I am in the midst of a DOHC swap into my NA car, but I am using VEMS ECU so it doesn't really matter to me, but I am still curious.
06-01-2017 | 03:04 PM
#27
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Which transistors are we talking here?