N20 Remap

Gwest44

Gwest44

Senior member
 Sheffield
I've read a lot of comments regarding the fact that the N20 engines (18i, 20i & 28i) are all the same and more interestingly can be made to provide increased performance via a remapping exercise - what I am not clear on from all the information I have read is whether you can physically tell if an N20 car has been remapped.

So my question is - is it all in the software and how the car performs or are there any physical indicators that would confirm the engine has been remapped?
 
The only real physical indicator would normally be a mapping dyno run print out or at least a certificate from a non dyno'd remap.. if its advertised as having one there should be something to prove
 
Gwest44 said:
I've read a lot of comments regarding the fact that the N20 engines (18i, 20i & 28i) are all the same and more interestingly can be made to provide increased performance via a remapping exercise - what I am not clear on from all the information I have read is whether you can physically tell if an N20 car has been remapped.

So my question is - is it all in the software and how the car performs or are there any physical indicators that would confirm the engine has been remapped?
Click to expand...

In the absence of any evidence, driving a known standard car before driving the potentially tweaked example will quickly make itself very obvious if it’s been remapped.
Rob
 
mr.tourette said:
The only real physical indicator would normally be a mapping dyno run print out or at least a certificate from a non dyno'd remap.. if its advertised as having one there should be something to prove
Click to expand...
The owner is not well versed in the world of Zed's - in short they don't have a clue if it has or not and to be honest until I asked the question didn't appear to know what remapping was :headbang:
 
Smartbear said:
Gwest44 said:
I've read a lot of comments regarding the fact that the N20 engines (18i, 20i & 28i) are all the same and more interestingly can be made to provide increased performance via a remapping exercise - what I am not clear on from all the information I have read is whether you can physically tell if an N20 car has been remapped.

So my question is - is it all in the software and how the car performs or are there any physical indicators that would confirm the engine has been remapped?
Click to expand...

In the absence of any evidence, driving a known standard car before driving the potentially tweaked example will quickly make itself very obvious if it’s been remapped.
Rob
Click to expand...
Although my signature would suggest otherwise (based on the number of Zed's I've owned) I have never driven the N20 - in short I have no idea what to expect or baseline to compare :headbang:
 
Not sure on the 28i, as I would expect it to not be massively different to factory, but a stock 18i feels like it's being strangled, literally, above about 2000rpm. You can feel it. I actually thought my turbo was knacked when I first drove it before the re-map. I would imagine a 20i feels the same only less so.
One big noticeable difference with a remap, is you can easily hear the induction (suck) and the release on overrun. Silent before. I have changed my air filter, but it isn't anything special so don't think it's that.
The N20 was designed by BMW to produce 245bhp (28i figures) as standard. So to reduce this by 60-90 bhp in the lesser models, they must have really throttled back the fuelling and boost. The interesting thing is the official MPG figures for all three outputs are identical; tells me the lower outputs are not using their fuel efficiently, presumably due to restrictive maps.
 
If the previous owner has never heard of remapping, and it doesn't feel shockingly quick compared to the published figures for a 20i, then why would you think it might have been remapped?
 
Pondrew said:
Not sure on the 28i, as I would expect it to not be massively different to factory, but a stock 18i feels like it's being strangled, literally, above about 2000rpm. You can feel it. I actually thought my turbo was knacked when I first drove it before the re-map. I would imagine a 20i feels the same only less so.
One big noticeable difference with a remap, is you can easily hear the induction (suck) and the release on overrun. Silent before. I have changed my air filter, but it isn't anything special so don't think it's that.
The N20 was designed by BMW to produce 245bhp (28i figures) as standard. So to reduce this by 60-90 bhp in the lesser models, they must have really throttled back the fuelling and boost. The interesting thing is the official MPG figures for all three outputs are identical; tells me the lower outputs are not using their fuel efficiently, presumably due to restrictive maps.
Click to expand...

I’d guess the official economy testing is mainly carried out without bringing the car onto boost, cruise mode will bring the same economy under these conditions-it’s only when the engines put under load & boost is allowed to build that the fuel usage would increase :thumbsup:
Rob
 
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