2.5i The Same Engine As 2.5si?

S

sharpyboy

Member
 Cornwall
I Vaguely remember reading somewhere the facelift N52 2.5i engine (177bhp) is the same engine as the N52 2.5si (218bhp), is this correct? what gives it the extra bhp, is it just different software in the ecu? Is it possible to upgrade this in th 2.5i for the extra bhp? :?
 
step_change said:
How do you know which BHP engine you've got? I know mine is a N52 but other than that.....
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If your Zed is the 2.5si as your sig suggests then you'll have the 218bhp engine :thumbsup:
 
I know the USA market gets a lower powered 3.0 car with the n52 engine, it misses out on the 3 stage DISA airbox for its electronic castration :o
 
And dont forget the prefacelift 2.5i (SE) with 192 bhp which I have. I have asked the question before about possibility of upgrading between the 177 bhp, the 192bhp and the 218bhp and no one seems able to say exactly what the differences are. Unless one has bigger valves, higher compression etc I would have thought differences would be ancillary like induction, injectors etc which would be easier to change.
 
Mike6 said:
And dont forget the prefacelift 2.5i (SE) with 192 bhp which I have. I have asked the question before about possibility of upgrading between the 177 bhp, the 192bhp and the 218bhp and no one seems able to say exactly what the differences are. Unless one has bigger valves, higher compression etc I would have thought differences would be ancillary like induction, injectors etc which would be easier to change.
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The prefacelift car has a completely different engine (m54 v n52) so could never be "upgraded" to si power.
Rob
 
Mike6 said:
Ah thanks Smartbear but there is a 218bhp SI version of my engine.
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The n52 isn't a version of the m54, it wasn't made until 06 onwards.
What year is your car?
Rob
 
My car is early 2005. Its the SE but the badge on the car says 'i'. I am sure there was also an Si version available with higher bhp
 
Mike6 said:
My car is early 2005. Its the SE but the badge on the car says 'i'. I am sure there was also an Si version available with higher bhp
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No, pre facelift are M54 only. Facelift (2006 onwards) with 177 or 218bhp using N52 engine.

SE is trim, nothing to do with I or Si.

Facelift was available as SE or Sport with either a 2.5i or 2.5Si so giving 4 possible combinations.
 
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