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Remap - Moving to a colder spark plug

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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BR138
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Remap - Moving to a colder spark plug

Post by BR138 » Thu Aug 24, 2017 12:14 am

Hi Gents,

First post from a long time lurker!

I recently had my car remapped over at BMW specialists Evolve Automotive, and am now making an additional 100bhp/125 ftlbs over stock.

I'm finding that while there are loads of mods & replacement/upgrade parts for the N20 based 3 and 4 series cars there are very few available that fit the E89! :x I've therefore already bought/done the few things I can throughout the car and am now looking at new spark plugs which are due a change.

Has anyone who remapped their 18/20/28i car (with similarly significant gains) swapped to a colder spark plug, and if so, what plugs and what were the results? I know this is very common practice on retuned VAG & Jap cars, but the only info I can find for BMW relates to the N54 engine and I failed to do any data-logging pre-remap to make a comparison myself now...

I'll be the guinea pig if I have to, but would be great if someone has already paved the way!

Thankyou
Sapphire Black 2013 LCI S20i @ 275bhp 330ftlb

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Smartbear
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Remap - Moving to a colder spark plug

Post by Smartbear » Thu Aug 24, 2017 5:42 am

Hi, I don't think there's any need to fit colder plugs? Bmw didn't change the plugs on the 28i model & that makes nearly 100bhp more than the 18i-it could even be detrimental, taking longer to warm up or cold fouling.
Evolve know what they're doing & I think Imran would recommend this if it was necessary or beneficial in any way?
Rob
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e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold

BR138
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Remap - Moving to a colder spark plug

Post by BR138 » Thu Aug 24, 2017 10:35 pm

Hi Rob,

Thanks for the response - Everything you've said has indeed gone through my mind already and I guess I should leave it be unless I run into issues. I've started data logging now so unless I see anything weird then I'll swap like for like.

Thanks
Sapphire Black 2013 LCI S20i @ 275bhp 330ftlb

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