E89 30i vs 20i (Remapped) comparison

wu_swordsman

Member
 Edinburgh
I drive a remapped 30i sitting at 276BHP and have a friend who just remapped his 20i to 262BHP. Same car, similar power. Obv the 30i is naturally aspirated straight-6 and the 20i is a turbo'd 4 cylinder but on paper they are pretty much identical once remapped with the 20i having a little extra torque...but my oh my they are far from a similar driving experience.

I jumped into the 20i and set off. First thing I noticed was the SUPER light clutch, it was so light it was like air and when the car moved off....there was no weight about the car, is the only way I can describe it. It was very surreal - it was my car but it wasn't my car. I tore along the road and it picked up as expected but felt a bit "soulless", still feeling super lightweight, then the turbo kicked in... a little excitement as I wasn't expecting the torque but it tails off fast. Long story short...jumping back into the 30i made me grin from ear to ear. Throwing the 20i into corners reminded me of driving an MX-5 - light, no drama cornering and point and shoot. Throwing the 30i into corners really is a joy with a bit more weight transfer testing the tyres.

...this is noway a 20i, 4-pot bashing session as it's so much bang for your buck, please dont take it as such. After all I recommended the 20i and the remapping to my friend and he's delighted. This is just a sharing experience for those torn between the two. I found the 20i to be a different kettle of fish compared to the 3 litre. The 30i feels a bit special, like an event, the progressive power needs to be experience to understand it. The weightiness, the orchestra of the 6-cylinders and the exhaust note.

There was also something special about seeing the mighty N52 engine filling every nook and cranny in the engine bay compared to the square 4 pot popped in the middle with a mass expanse around it.

For anyone that has come from or has an E85 3.0si - it's really hard to describe to those who haven't experienced it just how unique the 3. 0 naturally aspirated Z4's feel. It's a very unique driving experience.
 
These are the power graphs of the n52 3 litre engine & the 2 litre n20 28i outputs as tested by bmw :thumbsup:
D7C70570-CE91-4C40-87C7-F073E2B34328.png
Rob
 
wot he said.. and you cant duplicate the howl of the 3.0.. i loved my little 2.0 (non turbo) e85, its fun to drive.. but oh that howl and growl .. :driving:
 
road warrior said:
wot he said.. and you cant duplicate the howl of the 3.0.. i loved my little 2.0 (non turbo) e85, its fun to drive.. but oh that howl and growl .. :driving:

Yep, the 6 pot engine does sound better :thumbsup:
Rob
 
It’s an interesting concept that the worse handling car is nicer to drive...

There is a perverse pleasure in muscling a car around...my XC70 gives me that feeling...

Discuss...
 
There are various videos of racing at Crystal Palace? (I think) showing Mini's chasing down Mustangs and Camaros.
To me, this epitomises the differences. Do you want a big, muscular car with a great soundtrack but poorer handling, or a nippy little terrier that can maintain a higher speed through corners but loses a little on longer straights.
I alternate my commute between a 335d touring and a standard 20iS E89. I cover the distance of 28 miles on a twisting B road in almost identical times, but the driving technique is completely different.
The Z just gets up to speed and flows along, keeping a constant rhythm. The 3-series is slower round the twisty stuff but hammers off along the straights to make up the difference.
If you drew the speed on a graph the Z would be an almost flat sine wave, but the 3-series would look like the battlements on Windsor Castle.
Personally I feel more satisfied in the Z as I feel I have smoothed my way down the road.

So, I guess the choice comes down to how you prefer to drive, and what you prefer to hear whilst you're doing it.
 
I wouldn't say poorer handling. You can't compare the Z4 30i to a camero, a mustang (they handle like dogs) or even a heavy 335d touring.

It's more a combination of the progressive power and the little extra evenly spreaded weight. The 3.0 handles incredibly on m sport suspension and with MPS4's and quite happily keeps up with my friends 320bhp xdrive 330d.
 
wu_swordsman said:
I wouldn't say poorer handling. You can't compare the Z4 30i to a camero, a mustang (they handle like dogs) or even a heavy 335d touring.

It's more a combination of the progressive power and the little extra evenly spreaded weight. The 3.0 handles incredibly on m sport suspension and with MPS4's and quite happily keeps up with my friends 320bhp xdrive 330d.

Agreed, 'poorer' was not quite the correct word there.
Let's face it, opinions are like arseholes....everyone's got one, and they're all different.
For me, I enjoy smooth, flowing drives, and I find that suits me better in a nimble car that turns in better.
And when I finally get rid of these run-flats I'll be enjoying it even more. :)
 
enuff_zed said:
There are various videos of racing at Crystal Palace? (I think) showing Mini's chasing down Mustangs and Camaros.
To me, this epitomises the differences. Do you want a big, muscular car with a great soundtrack but poorer handling, or a nippy little terrier that can maintain a higher speed through corners but loses a little on longer straights.
I alternate my commute between a 335d touring and a standard 20iS E89. I cover the distance of 28 miles on a twisting B road in almost identical times, but the driving technique is completely different.
The Z just gets up to speed and flows along, keeping a constant rhythm. The 3-series is slower round the twisty stuff but hammers off along the straights to make up the difference.
If you drew the speed on a graph the Z would be an almost flat sine wave, but the 3-series would look like the battlements on Windsor Castle.
Personally I feel more satisfied in the Z as I feel I have smoothed my way down the road.

So, I guess the choice comes down to how you prefer to drive, and what you prefer to hear whilst you're doing it.

Not sure I follow your logic there. The 30i weighs 10kg more than the 20i according to Parkers guide.
 
I was following from the original comments relating to the handling, from which the OP implied that the 20i 'felt' much lighter than the 30i. At the end of the day it's all down to real-world impressions and if that's how he thought it felt....................

My impression from many previous threads was that it isn't so much the weight, but where it is positioned.

Anyway, it was only my opinion.............................
 
wu_swordsman said:
I wouldn't say poorer handling. You can't compare the Z4 30i to a camero, a mustang (they handle like dogs) or even a heavy 335d touring.

It's more a combination of the progressive power and the little extra evenly spreaded weight. The 3.0 handles incredibly on m sport suspension and with MPS4's and quite happily keeps up with my friends 320bhp xdrive 330d.

It’s all a bit esoteric but the ‘feeling’ is created in part by some extra weight but also the fact that quite a bit of weight of the engine is carried forward of the front axles...so if anything the polar moment of inertia is quite marked between the 30i and the 20i which explains why the front end feels like it’s nodding the front of the car..all imho
 
enuff_zed said:
I was following from the original comments relating to the handling, from which the OP implied that the 20i 'felt' much lighter than the 30i. At the end of the day it's all down to real-world impressions and if that's how he thought it felt....................

My impression from many previous threads was that it isn't so much the weight, but where it is positioned.

Anyway, it was only my opinion.............................

Impressions can be deceptive, the op describes the mapped 20i as having “a little extra torque” when in reality it’s a considerable increase over the 30i’s torque output (over 30% i believe) and also achieved at lower rpm, just what you want for accelerating out of corners :thumbsup:
Rob
 
R.E92 said:
enuff_zed said:
There are various videos of racing at Crystal Palace? (I think) showing Mini's chasing down Mustangs and Camaros.
To me, this epitomises the differences. Do you want a big, muscular car with a great soundtrack but poorer handling, or a nippy little terrier that can maintain a higher speed through corners but loses a little on longer straights.
I alternate my commute between a 335d touring and a standard 20iS E89. I cover the distance of 28 miles on a twisting B road in almost identical times, but the driving technique is completely different.
The Z just gets up to speed and flows along, keeping a constant rhythm. The 3-series is slower round the twisty stuff but hammers off along the straights to make up the difference.
If you drew the speed on a graph the Z would be an almost flat sine wave, but the 3-series would look like the battlements on Windsor Castle.
Personally I feel more satisfied in the Z as I feel I have smoothed my way down the road.

So, I guess the choice comes down to how you prefer to drive, and what you prefer to hear whilst you're doing it.

Not sure I follow your logic there. The 30i weighs 10kg more than the 20i according to Parkers guide.

Hmm, 20kg difference here https://www.ultimatespecs.com/car-comparator/26890,11166/BMW-Z4-(E89)-Roadster-vs-BMW-Z4-(E89)-Roadster.html
Rob
 
Both great versions of the Z4. Both excellent handling. Both have excellent performance. Both are exciting to drive. If you get the opportunity to try both back to back I urge you to. Its amazing how different they feel.....and not in a bad way at all.
 
Well according to US brochures 2011 30i vs 2014 28i (30mm bigger discs)

Manual 3263 lbs vs 3232 lbs. ie 31 lbs

Auto 3329 lbs vs 3307 lbs ie 22 lbs

Shows how porky the auto box is..

35is 3549 lbs..that’s much porkier , bigger brakes, more turbos, adaptive suspension

Just for the record...
 
wu_swordsman said:
Both great versions of the Z4. Both excellent handling. Both have excellent performance. Both are exciting to drive. If you get the opportunity to try both back to back I urge you to. Its amazing how different they feel.....and not in a bad way at all.

I’ve had 2 previous 3litre z4’s, an si e85 and one just like yours, both very capable cars :wink:
4B63771F-E208-45CD-91F1-6959FEA4EA99.jpeg4F1A0652-68AA-42F6-8011-9185D2F7AF4C.jpeg
Rob
 
Pbondar said:
Well according to US brochures 2011 30i vs 2014 28i (30mm bigger discs)

Manual 3263 lbs vs 3232 lbs. ie 31 lbs

Auto 3329 lbs vs 3307 lbs ie 22 lbs

Shows how porky the auto box is..

35is 3549 lbs..that’s much porkier , bigger brakes, more turbos, adaptive suspension

Just for the record...

It's hard to get a good accurate weight of cars but it does seem to be 10-15kg extra going from a 28i to a 30i but a power boost of 13bhp. Going from 28i to 35is gains 100kg but a power boost of 90bhp.

The Z4 has such a huge engine bay. It seems so wrong only having a eco lump under the bonnet :P
 
R.E92 said:
Pbondar said:
Well according to US brochures 2011 30i vs 2014 28i (30mm bigger discs)

Manual 3263 lbs vs 3232 lbs. ie 31 lbs

Auto 3329 lbs vs 3307 lbs ie 22 lbs

Shows how porky the auto box is..

35is 3549 lbs..that’s much porkier , bigger brakes, more turbos, adaptive suspension

Just for the record...

It's hard to get a good accurate weight of cars but it does seem to be 10-15kg extra going from a 28i to a 30i but a power boost of 13bhp. Going from 28i to 35is gains 100kg but a power boost of 90bhp.

The Z4 has such a huge engine bay. It seems so wrong only having a eco lump under the bonnet :P

170mph eco lump, that’s my kind of green credentials :P
Rob
 
wu_swordsman said:
I drive a remapped 30i sitting at 276BHP and have a friend who just remapped his 20i to 262BHP. Same car, similar power. Obv the 30i is naturally aspirated straight-6 and the 20i is a turbo'd 4 cylinder but on paper they are pretty much identical once remapped with the 20i having a little extra torque...but my oh my they are far from a similar driving experience.

I jumped into the 20i and set off. First thing I noticed was the SUPER light clutch, it was so light it was like air and when the car moved off....there was no weight about the car, is the only way I can describe it. It was very surreal - it was my car but it wasn't my car. I tore along the road and it picked up as expected but felt a bit "soulless", still feeling super lightweight, then the turbo kicked in... a little excitement as I wasn't expecting the torque but it tails off fast. Long story short...jumping back into the 30i made me grin from ear to ear. Throwing the 20i into corners reminded me of driving an MX-5 - light, no drama cornering and point and shoot. Throwing the 30i into corners really is a joy with a bit more weight transfer testing the tyres.

...this is noway a 20i, 4-pot bashing session as it's so much bang for your buck, please dont take it as such. After all I recommended the 20i and the remapping to my friend and he's delighted. This is just a sharing experience for those torn between the two. I found the 20i to be a different kettle of fish compared to the 3 litre. The 30i feels a bit special, like an event, the progressive power needs to be experience to understand it. The weightiness, the orchestra of the 6-cylinders and the exhaust note.

There was also something special about seeing the mighty N52 engine filling every nook and cranny in the engine bay compared to the square 4 pot popped in the middle with a mass expanse around it.

For anyone that has come from or has an E85 3.0si - it's really hard to describe to those who haven't experienced it just how unique the 3. 0 naturally aspirated Z4's feel. It's a very unique driving experience.


I recently bought a 30i and just last week had a chance to drive a 28i mine isn't mapped but again the power figures are very similar between the 30i and 28i and just like what you found, my thoughts are exactly the same. Made me realise just how special the 3.0 NA version of the Z4 is. After reading your other post I will probably get mine remapped at some point in the future.
 
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