1998 SLK 230
ive been using this now for a while and now can post back... all i can say is WOW... i can wheelspin from a roll at ~50km/h.... I will have to do 0-100 timed run but still waiting for good weather as its winter here and conditions arent ideal yet.
the biggest difference is from 2000rpm+ when boost kicks in. it kicks in HARD . cruising around requires significantly less throttle to get the car to move and throttle response is very snappy.
reason why it makes a big difference is the older pre face lift slk uses TWO coil packs for 4 cylinders which is called a "wasted spark" system. which means the coil fires 2 spark plugs at once. for example cylinder 2 is on the compression cycle (piston near the top) and then it fires. at the same time cylinder 1 is on the exhaust cycle (piston at the bottom) and cylinder 1 fires too (thats why its called wasted spark)... to fire in cylinder 2 requires the coil to work harder as its compressed. so it takes the bulk of the coils voltage. firing in cylinder 1 requires hardly any as its in the exhaust cycle.
thats one disadvantage it chews voltage which could be going to the cylinder which needs it most. the next major disadvantage is the coils dont get sufficient time to "re-charge" for the next firing compared to having a coil for each cylinder.
this device boosts the voltage and makes sure its constant (no drops). it simply plugs into fuse F11 in the engine bay to intercept the voltage going to the coils.
im still running 0.8mm gap on my plugs and will bump it to 1.0mm now as i have enough juice to them...
if anyone wants one i found a seller selling them cheap! pm for details. i got mine $80USD + shipping
in terms of difference to the car where say a pulley kit is 10/10 id put this at a 5-6/10...
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