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Bosch spark plugs crack#
Now the part number is Bosch ZR5TPP330A (the A version iirc is the updated one that doesn't crack there was TSB on this). "Ok so you have 2 real options for spark plugs:ġ) The OEM bosch plugs which are totally fine to use in high power level situations, and their heat range is also fine up to 700 whp (GTR's run a similar best range plug deep into the 700 whp range and they don't have issues). Here is what I posted about plugs in another thread: 020Īctually this is a common misconception in the tuning industry and literally everyone thinks a spark plug "upgrade" or gapping down is a benefit when it's not.
Bosch spark plugs manual#
022 is suggested for most stock turbo applications, I use a lot of ethanol and I'm manual (longer + more sustained load during pulls) so I am. The stock ones are hot even on the stock tune, 97506 is a more appropriate temperature range (2 steps colder). NGK 97506 are the industry standard when you begin tuning, majority of people who are stock turbo FBO N55 running pump or emixes use those plugs. I highly suggest cancelling that order and getting NGK 97506 plugs. The bosch plugs IIRC come gapped from 0.032-0.035 so you proabably have to gap down to 0.028". But the stock gap for the s55 and n55 should be 0.028", while the stock gap for the n55 is 0.032".
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Here is the FCP euro link for the incorrect 33 version of the 33 bosch spark plug: ģ) Gap: this one has been hard to find but when I get a chance I will look at ISTA again. Here is the FCP euro link for the correct 330A/330 spark plug that you should be buying. But the important part is it is the 330 version, not the 33 version, because the 330 version (1 step colder than stock n55) is for the S55 and n55 m2 while the 33 version is for the normal n55. Note these plugs can also be called "RB ZMR5TPP330" without the A at the end, so to ensure you got the correct plug see if the plug has these MFG numbers which are correct:Īfter that make sure the compatible OEM part numbers has the one bmw provides as well, then you can be sure you got the correct plug. The OEM part number for this plug is: 12120039634 This spark plug should be discontinued so the chance of accidentally buying this defective plug should be low to impossible now, unless you get some really really really old stock - so just check the part numbers on the box when you get it.Ģ) You should be purchasing the ZR5TPP330A version which is the updated one found on the S55 and m2 n55. So ensure these part numbers are not present in the spark plugs part numbers and you are fine.
Bosch spark plugs cracked#
Ok lets clear up some spark plug information, I have not really been clear enough on this in the past and have also made some small slip ups so I want to also clarify it here:ġ) If you are buying the bosch plugs you should avoid ZR5TPP339 this is the one that have cracked insulator issues.