Quote:
Originally Posted by clarence
Go back last yr & search for previous threads re N20 20i, several of us (E90fleet, etc) did a part number match for some key parts & they turned up identical. I didn't say "N20B20xxx" is the part number, I only said they're the engine codes. There were some differences for different periods of times (e.g. the turbo) & also for different models (low or high compression depending on chassis type), but they are batch related according to E90fleet. As I said, wht determines parts that are essentially identical been given different part numbers? Materials used (not in this case)? Design (not for the N20)? Manufacturing quality (never say never)? We also discussed abt compression ratios then. Probably u haven't been long enough here to catch those previous threads......
Well, ur engine is making 235ps but it's not making 245ps. Of course those piggy-back modules have limitations, but don't u think some of the larger tuners such as Hartge have tried sth more comprehensive than a piggy-back? If it did work then they would've offered it cos of the potentially big market in Asia & some parts of Europe.
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Truth be told, I have actually been through almost many threads on n20 engine and many of them are more like people who don't actually own one speculating what is the difference between the differen power level. Some are people who have not even seen the part number catalogue, telling people the engine are the same or different. Perhaps it will be nice if you could point me to the compression ratio discussion.
Yes, part number is different between different time of manufacturing, but in all instances, the short engine for the n20 is the same whether you order the 20i with 858A option or 28i. The turbo is the same.
However, if yours is ordered without the 858A option, the turbo is the same, but the short engine is not, because the pistons are different. Correct me if I am wrong, but it is really difficult to build an engine, dyno it, and then open up the engine to replace the piston/change the compression ratio, isn't it?
In any case, we are talking about 245hp out of a turbo di engine for their lowest end market, not 800hp. It isn't that difficult to achieve that in the first place.
As for the 235hp vs 245hp, I am sure my engine can make more than 250hp with a change of downpipe+exhaust and a higher tune with premium pump petrol. The problem is why would I want to do that when the amount of money spent to do that can get me a 28i in the first place? This is just a car for daily commuting, not a M-car. I can see myself spending $600 to make it 50hp faster. it just does not make sense to throw in another 5k to make it another 15hp faster.