N52 Modifications?

S

SnackobSnazell

Member
Hey Guys & Girls,
I own a E89 Z4 23i sDrive and was wondering if it would be possible to potentially gain more power from the engine. I've watched videos on youtube where people have changed the intake manifold to a three stage intake manifold for more power but I've only seen this been done on the 3L version of the n52 engine and I'm unsure what kind of effect it would have on my Z4. Was just curious if anyone has made any changes to their engine to get a significant improvement of HP output
Cheers x
 
I may be wrong but I am sure the E89 2.5 already has the 3 stage intake. Otherwise you'd have around 175bhp like the E85 2.5i with the single intake.
 
200bhp from a 2.5 naturally aspirated is already 80bhp per litre, which is pretty good.

i guess you could see what the differences are between the N52 engine in your e89 sdrive23i, and the N52 engine in the earlier, E85 2.5si, which makes 215 bhp.

but even if you could convert the engine to make the power of the 2.5si, an extra 15 bhp wouldnt be a significant improvement in my mind. Engine tuning on naturally aspirated engines is big money for not a lot of gain, if you're looking for cheap power, i'd sell your 23i, buy a 20i with a turbo and get it remapped up to 240bhp.
 
I put a quantum remap on mine, they claim an extra 25bhp but in reality its probably more like 10-15, definitely adds a bit of zing lower down and in the midrange, not earth shattering but a notable improvement. around 200 quid, they offer a 30 day money back guarantee if you are not happy and will return the car to its original map. Worth a try to see if you like it, needless to say i didnt go for a refund as I thought it was a good upgrade
 
mr.tourette said:
I put a quantum remap on mine, they claim an extra 25bhp but in reality its probably more like 10-15, definitely adds a bit of zing lower down and in the midrange, not earth shattering but a notable improvement. around 200 quid, they offer a 30 day money back guarantee if you are not happy and will return the car to its original map. Worth a try to see if you like it, needless to say i didnt go for a refund as I thought it was a good upgrade
Click to expand...

Is yours the 23i or 30i?
 
Silverstar said:
mr.tourette said:
I put a quantum remap on mine, they claim an extra 25bhp but in reality its probably more like 10-15, definitely adds a bit of zing lower down and in the midrange, not earth shattering but a notable improvement. around 200 quid, they offer a 30 day money back guarantee if you are not happy and will return the car to its original map. Worth a try to see if you like it, needless to say i didnt go for a refund as I thought it was a good upgrade
Click to expand...

Is yours the 23i or 30i?
Click to expand...
23i buddy
 
mr.tourette said:
Silverstar said:
mr.tourette said:
I put a quantum remap on mine, they claim an extra 25bhp but in reality its probably more like 10-15, definitely adds a bit of zing lower down and in the midrange, not earth shattering but a notable improvement. around 200 quid, they offer a 30 day money back guarantee if you are not happy and will return the car to its original map. Worth a try to see if you like it, needless to say i didnt go for a refund as I thought it was a good upgrade
Click to expand...

Is yours the 23i or 30i?
Click to expand...
23i buddy
Click to expand...

I've been contemplating doing this mod for some time on my 30i and was about to do it but then spent the money elsewhere as someone got me hooked on upgrading my sound system! :rofl: :rofl: :rofl:
 
mr.tourette said:
I put a quantum remap on mine
Click to expand...

Cheers for the response guys, really appreciate it. @mr.tourette, where you able to get a dyno graph of the differences in outputs? (before & after). Most tuners who i've talked to have said that it would realistically only be around 5-15hp gain and a slight difference in torque
 
brillomaster said:
i'd sell your 23i, buy a 20i with a turbo and get it remapped up to 240bhp.
Click to expand...
Cheers for the response mate, You're spot on there however I love the way the straight 6 delivers it's power and it sounds amazing!
 
lucasxdiniz said:
I may be wrong but I am sure the E89 2.5 already has the 3 stage intake. Otherwise you'd have around 175bhp like the E85 2.5i with the single intake.
Click to expand...
Cheers for the response, You're probably right to be honest. I've really struggled on finding any information on modifying the n52b25 and a shed load on the 3L n52. Think the smartest thing for me to do would be to sell and buy a 3.0 e85 but I prefer the interior and looks of the e89. Can't really afford a 35is at the moment although I would love one :lol:
 
OP if you really want more power but you like the NA inline 6 perhaps might be an idea to look out for a 30i?
 
SnackobSnazell said:
mr.tourette said:
I put a quantum remap on mine
Click to expand...

Cheers for the response guys, really appreciate it. @mr.tourette, where you able to get a dyno graph of the differences in outputs? (before & after). Most tuners who i've talked to have said that it would realistically only be around 5-15hp gain and a slight difference in torque
Click to expand...
no dyno run at that price but there are garages you can have a dyno run with your quantum map, obviously if you weren't happy then you would only get the cost of the map refunded and not any charges for dyno runs. The way i saw it with the money back guarantee if I didn't notice an improvement then it would have gone straight back in for a refund so nothing to lose. I was realistic with my expectations as without a turbo i appreciated the gains wouldn't be huge but there was an instant improvement in pick up that the 23i lacks a little low down in the rev range. For me it was 200 quid well spent. When i inevitably find the right 30i I will do the same again
 
looking at their website they are offering it at £249 (discounted from £349)
 
mr.tourette said:
I put a quantum remap on mine, they claim an extra 25bhp but in reality its probably more like 10-15, definitely adds a bit of zing lower down and in the midrange, not earth shattering but a notable improvement. around 200 quid, they offer a 30 day money back guarantee if you are not happy and will return the car to its original map. Worth a try to see if you like it, needless to say i didnt go for a refund as I thought it was a good upgrade
Click to expand...
I guarantee you its nowhere near even 15BHP. Remapping a normally aspirated car will make virtually zero difference to BHP but what it can do especially on a 6 pot is improve the torque curve making it smoother and more driveable. I had my 23i mapped on a rolling road by celtic, they know their stuff and told me up front that any meaningful gain in BHP was unlikely, I think it was around 6 BHP gain total and that was after around 3 hours of tweaking! However the torque delivery was silk smooth, came in earlier and the car felt faster, because torque influences accelaration, not BHP.
 
mcbutler said:
mr.tourette said:
I put a quantum remap on mine, they claim an extra 25bhp but in reality its probably more like 10-15, definitely adds a bit of zing lower down and in the midrange, not earth shattering but a notable improvement. around 200 quid, they offer a 30 day money back guarantee if you are not happy and will return the car to its original map. Worth a try to see if you like it, needless to say i didnt go for a refund as I thought it was a good upgrade
Click to expand...
I guarantee you its nowhere near even 15BHP. Remapping a normally aspirated car will make virtually zero difference to BHP but what it can do especially on a 6 pot is improve the torque curve making it smoother and more driveable. I had my 23i mapped on a rolling road by celtic, they know their stuff and told me up front that any meaningful gain in BHP was unlikely, I think it was around 6 BHP gain total and that was after around 3 hours of tweaking! However the torque delivery was silk smooth, came in earlier and the car felt faster, because torque influences accelaration, not BHP.
Click to expand...
Well there you are then.. i wasn't making any claims on bhp just a guess but my experience is as we have both noted, car feels noticibly quicker with power coming in stronger lower down in the rev range , ultimately its about making an improvement which for £200 over the lifetime of ownership is money well spent imho :thumbsup:
 
mr.tourette said:
mcbutler said:
mr.tourette said:
I put a quantum remap on mine, they claim an extra 25bhp but in reality its probably more like 10-15, definitely adds a bit of zing lower down and in the midrange, not earth shattering but a notable improvement. around 200 quid, they offer a 30 day money back guarantee if you are not happy and will return the car to its original map. Worth a try to see if you like it, needless to say i didnt go for a refund as I thought it was a good upgrade
Click to expand...
I guarantee you its nowhere near even 15BHP. Remapping a normally aspirated car will make virtually zero difference to BHP but what it can do especially on a 6 pot is improve the torque curve making it smoother and more driveable. I had my 23i mapped on a rolling road by celtic, they know their stuff and told me up front that any meaningful gain in BHP was unlikely, I think it was around 6 BHP gain total and that was after around 3 hours of tweaking! However the torque delivery was silk smooth, came in earlier and the car felt faster, because torque influences accelaration, not BHP.
Click to expand...
Well there you are then.. i wasn't making any claims on bhp just a guess but my experience is as we have both noted, car feels noticibly quicker with power coming in stronger lower down in the rev range , ultimately its about making an improvement which for £200 over the lifetime of ownership is money well spent imho :thumbsup:
Click to expand...
Quicker with smoother power from lower revs is exactly what I got with my 23i, I even strted pulling away in 2nd gear quite often with no problems at all. I used to drive it across Dartmoor pretty much in 3rd or 4th all the way, the torque curve matched those gears perfectly for a bit of 'scratching'. Enjoy your 'new' car :thumbsup:
People obsess about BHP 'I can feel the exrtra 50 horses', well, they cant all you we is the increased, improved torque and its delivery.
 
You must log in or register to reply here.
Back
Top Bottom