Z4 3.0 SI performance not that impressive
- Thread starter Ooch
- Start date
MrPT said:
The 2.5Si and 3.0Si are pretty much the same engine.
They use Valvetronic and valve lift to throttle the engine and so shape the torque curve.
From what I've read there are tuners now offering packages for the 2.5Si that basically give them the 3.0Si valve lift range and so bring their power and torque very close or the same as the 3.0Si engine.
Dave
Mr Whippy said:
Interesting. Got any links?
The 3.0si has a fundamental displacement advantage, so I find it a bit odd that it has more aggressive Valvetronic tuning than the 2.5si (it also has very similar real-world fuel economy). If it doesn't, and there is simply some headroom available in the valve lift on both models, then it follows that the re-tune should be available for the 3.0si as well.
EDIT - OE Tuning claim an additional 25HP for the 3.0si via OBD2 flash. Seems improbable otherwise a lot more people would have done it for ~ £250.
The 3.0Si is a 3.0l engine. The 2.5Si is a 3.0l engine.
The 2.5Si simply has it's valve lift limited and thus power/torque trimmed a lot. There are some other detail changes but by and large BMW just changed the mapping to limit output and badged the car 2.5.
The tuning claims are a bit iffy from any tuner in my experience hehe... but in the 2.5Si's case the boost in power/torque comes from simply opening the metaphoric tap to 100% rather than the BMW limited 80%
I can't remember who does the mod now. I was discussing the lack of a big power NA 1 series Coupe (old shape)... then someone mentioned that a tuning company now takes the 125Ci and basically makes it a 130Ci with about 265bhp or so.
Well worth looking into for all those 2.5Si owners any way as it could be a quick route to 260bhp or so
Dave
The 2.5Si simply has it's valve lift limited and thus power/torque trimmed a lot. There are some other detail changes but by and large BMW just changed the mapping to limit output and badged the car 2.5.
The tuning claims are a bit iffy from any tuner in my experience hehe... but in the 2.5Si's case the boost in power/torque comes from simply opening the metaphoric tap to 100% rather than the BMW limited 80%
I can't remember who does the mod now. I was discussing the lack of a big power NA 1 series Coupe (old shape)... then someone mentioned that a tuning company now takes the 125Ci and basically makes it a 130Ci with about 265bhp or so.
Well worth looking into for all those 2.5Si owners any way as it could be a quick route to 260bhp or so
Dave
I suppose If you wanna go fast these days get a diesel Barge....
http://www.parkers.co.uk/cars/reviews/facts-and-figures/bmw/4-series/coupe-2013/61883/
50 MPG 4.5 ses 0-60
http://www.parkers.co.uk/cars/reviews/facts-and-figures/bmw/4-series/coupe-2013/61883/
50 MPG 4.5 ses 0-60
Ooch said:I suppose If you wanna go fast these days get a diesel Barge....
http://www.parkers.co.uk/cars/reviews/facts-and-figures/bmw/4-series/coupe-2013/61883/
50 MPG 4.5 ses 0-60
ive seen some great figures out of bmw diesels and mild tuning attempts
one would certainly have put us to shame.Have been considering these to be honest as they seem to offer many benefits strong performance usable torque & very good economy, having now sold my M3 which I owned when I first posted on this thread I can agree that the 3.0 straight six in my 330i isn't that impressive in terms of performance but I blame the weight of the 3 series for that but I do love the N52 engine very much as its silky smooth & very free revving & although its not very vocal the sound it makes is very pleasant & it has what I describe as usable power.Ooch said:I suppose If you wanna go fast these days get a diesel Barge....
http://www.parkers.co.uk/cars/reviews/facts-and-figures/bmw/4-series/coupe-2013/61883/
50 MPG 4.5 ses 0-60
