Replace your spark plug wires! - Mercedes-Benz Forum
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post #1 of 13 (permalink) Old 04-12-2019, 04:03 AM Thread Starter
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Date registered: Jan 2007
Vehicle: 1998 SLK 230
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Replace your spark plug wires!

this applies to the older 1998-2000 SLK's running the two coil packs (wasted spark system).

go change your wires!!! mine have never been changed and boy did it make a difference, especially top end.

they were reading around 2.3k Ohm, and the new wires reading about 1.7k Ohm. The boots directly on the bottom of the coil dont need to be changed unless damaged. its the ones with the wire only as the wire breaks down over time.

I went with the NGK ones. they are 7mm (slightly thicker than factory).

NGK part number "RC-MBL807"

change them and you will thank me later...
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- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator
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post #2 of 13 (permalink) Old 04-12-2019, 04:04 AM Thread Starter
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Date registered: Jan 2007
Vehicle: 1998 SLK 230
Location: Melbourne, AU
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by means these arent cheap wires but shop around online you can find them cheaper.. most places wanted around $202 AUD for them but found them online for $163 AUD. just need to keep looking etc.

the guys with the SLK 2000+ this is not applicable to you as you guys already have the better "Coil On Plug" setup - 1 coil for each plug

- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator
Subby_ is online now  
post #3 of 13 (permalink) Old 04-12-2019, 05:28 AM
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Date registered: Feb 2017
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Garage
Thx! they look pretty good to

Just put this on my todo list! (180k km now)


edit: the old wasted spark setup allows to install a cheap omex dual coil rev limiter/launch control
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post #4 of 13 (permalink) Old 04-13-2019, 03:26 AM Thread Starter
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Date registered: Jan 2007
Vehicle: 1998 SLK 230
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just finished up a track day and yes they made a difference there were no other changes made to the car apart from this and i gained +8km/h more at the end of the main straights compared to my previous track days.

just shows how cooked the old wires were! for reference my car has 220,000 kms now

- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator
Subby_ is online now  
post #5 of 13 (permalink) Old 04-13-2019, 02:58 PM
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Date registered: May 2010
Vehicle: 99 SLK 200 K (M111.943, Eaton M62, 5 Speed Manual) SL55 AMG look, 18'' AMG style 4
Location: Athens, Greece, Europe
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Nice Subby, thanks for measuring. I ll do to.
Do you think that the voltage booster that we have, pushes them harder or just the years?
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post #6 of 13 (permalink) Old 04-13-2019, 06:53 PM Thread Starter
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Date registered: Jan 2007
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i dont think it does, it may increase wear but i wouldn't say massively...

i noticed a big difference going from no voltage booster, to booster and that was most likely to worn out ignition wires. now with fresh wires its considerable even more noticeable. very very responsive under boost

the NGK wires have a silicon outer which can withstand a lot more heat and they are the lowest resistance wires on the market.

also the NGK wires are wire-wound and the resistance of the wire shouldn't change much if at all over time. the traditional solid carbon core wires wear out and increase resistance over time.

- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator
Subby_ is online now  
post #7 of 13 (permalink) Old 04-15-2019, 05:24 AM
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Date registered: May 2010
Vehicle: 99 SLK 200 K (M111.943, Eaton M62, 5 Speed Manual) SL55 AMG look, 18'' AMG style 4
Location: Athens, Greece, Europe
Posts: 121
Mentioned: 1 Post(s)
Quoted: 13 Post(s)
I find this part # only in AU and NZ.
I cant find anywhere in EU or even US.
Is there and other number on it? EAN or UPC? They are asking me from NGK US.
The set is a 4x or a 2x set? or even a single cable?
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post #8 of 13 (permalink) Old 04-15-2019, 05:53 AM
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Garage
oem replacement ngk ones are: (prolly oem thickness)
0757 NGK stocknr or RC-MB222 (what i'm getting)

this is a set of 2 cables

if the oem ones last for 200k+ km I guess they should be fine



Sent from my SM-G930F using Tapatalk
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post #9 of 13 (permalink) Old 04-15-2019, 04:43 PM Thread Starter
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Date registered: Jan 2007
Vehicle: 1998 SLK 230
Location: Melbourne, AU
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I'm curious to see the thickness of those, but either way, it will be an improvement as it is a service item to do leads!

- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator
Subby_ is online now  
post #10 of 13 (permalink) Old 04-24-2019, 08:26 AM
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Date registered: Feb 2017
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Garage
Just got my new ones, they are the same as oem with 2Kohm ends and oem wire thickness,






I only managed to find the RC-MBL807 leads in Australia, It probably has to do with RFI and EMI laws and that is most likely why you can't find them anywhere else in the world
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