Quantum Remap on E89 20i

[Smartbear]

Guys let's be honest. It's the flux capacitor in the 28i that makes the difference.

In the absence of any other proven reason I agree
Rob

[ronk]

If they can wring that much out of a 2.0l then what would they do with the 35i or 35is?

[Smartbear]

If they can wring that much out of a 2.0l then what would they do with the 35i or 35is?

Go on Ron, you know you want to
Rob

[Nictrix]

A quick look at what PBondar posted shows that the final drive ratio is also different between the 18i, 20i and the 28i.
It is also different between the 35i and the 35is so that's another difference between them and not just a map.

[Smartbear]

A quick look at what PBondar posted shows that the final drive ratio is also different between the 18i, 20i and the 28i.
It is also different between the 35i and the 35is so that's another difference between them and not just a map.

We were discussing things which could justify the price difference, a gearing change shouldn’t change the cost or the engine output.
Rob

[Nictrix]

A quick look at what PBondar posted shows that the final drive ratio is also different between the 18i, 20i and the 28i.
It is also different between the 35i and the 35is so that's another difference between them and not just a map.

We were discussing things which could justify the price difference, a gearing change shouldn’t change the cost or the engine output.
Rob

Everything changes the cost of things. You already mentioned brakes.

[Smartbear]

A quick look at what PBondar posted shows that the final drive ratio is also different between the 18i, 20i and the 28i.
It is also different between the 35i and the 35is so that's another difference between them and not just a map.

We were discussing things which could justify the price difference, a gearing change shouldn’t change the cost or the engine output.
Rob

Everything changes the cost of things. You already mentioned brakes.

Yes, but it won’t alter the engines output though.
Rob

[Pbondar]

A quick look at what PBondar posted shows that the final drive ratio is also different between the 18i, 20i and the 28i.
It is also different between the 35i and the 35is so that's another difference between them and not just a map.

In fact a bit of digging shows, assuming BMW's literature is correct:

1) 28i has different fd ratio in US vs Europe 3.08(M) 3.73(A) vs 3.08 for both M and A
2) In US both 35i and 35is have fd ratio of 2.56

So BMW spends more time fiddling fd ratio than most other things..I assume this is do to with some aspects of fuel consumption figure plus typical sweet spot for cruising etc.

With a 7 or 8 speed box it can't be particularly about pure acceleration unless dropping the final drive ratio helps overcome wheel spin issues off launch..

I worked in product planning in hi tech and why the spec of a product came out as it did was subject to a variety of issues: dealer feedback, price justification, known buyer behaviour, perceived benefits etc etc..

So just be grateful that you can remap a 18i/20i/28i all to around 280bhp safely...at some point after that you get into increasing probability of it going bang, it seems that 320bhp and 310ft lb seems to be the limit when combined with aggressive/sustained driving....imho

[Pbondar]

If they can wring that much out of a 2.0l then what would they do with the 35i or 35is?

The ease at which power can be liberated on the N20 engine is in part to its newer design 2011 vs 2006 ..60-80 BHP can be wrought from the N54 on the same basis, however its cooling reserves (water, oil, inter cooler) are more limited and become the constraining factors with people wanting easy lives/modest budgets..

[ronk]

If they can wring that much out of a 2.0l then what would they do with the 35i or 35is?

Go on Ron, you know you want to
Rob

I do,and although this is the most powerful car I’ve owned I find I can quite easily drop into old gits pottering mode at times and enjoy it!

Sad isn’t it?

[Smartbear]

If they can wring that much out of a 2.0l then what would they do with the 35i or 35is?

Go on Ron, you know you want to
Rob

I do,and although this is the most powerful car I’ve owned I find I can quite easily drop into old gits pottering mode at times and enjoy it!

Sad isn’t it?

I’m the same Ron, I rarely give my car the big stick but it’s nice to know it’s there if you need to call on it
Rob

[ronk]

Go on Ron, you know you want to
Rob

I do,and although this is the most powerful car I’ve owned I find I can quite easily drop into old gits pottering mode at times and enjoy it!

Sad isn’t it?

I’m the same Ron, I rarely give my car the big stick but it’s nice to know it’s there if you need to call on it
Rob

So glad it’s not only me !
The only thing for certain is the exhaust note when in “sport mode” the pops bangs and poomfs is addictive!

Mrs K says “ you’ll never grow up”

[R.E92]

A quick look at what PBondar posted shows that the final drive ratio is also different between the 18i, 20i and the 28i.
It is also different between the 35i and the 35is so that's another difference between them and not just a map.

That's because that chart compares cars with different transmissions.

The quoted figures there are for a 35i manual and a 35is DCT. The 35i DCT will have the same gear and final drive ratio.
Not sure on the reason for the discrepancy in the smaller engine models, possibly a similar story with the 18 and 20 models having the manual stats and the 28 having the slushbox stats.

[Nictrix]

A quick look at what PBondar posted shows that the final drive ratio is also different between the 18i, 20i and the 28i.
It is also different between the 35i and the 35is so that's another difference between them and not just a map.

That's because that chart compares cars with different transmissions.

The quoted figures there are for a 35i manual and a 35is DCT. The 35i DCT will have the same gear and final drive ratio.
Not sure on the reason for the discrepancy in the smaller engine models, possibly a similar story with the 18 and 20 models having the manual stats and the 28 having the slushbox stats.

This is going off the topic that I have already been chastised for but I would assume then that the final drive ratio which can be seen as different between the 35is DCT and the 35i manual would be different again for a 35i auto.

[R.E92]

A quick look at what PBondar posted shows that the final drive ratio is also different between the 18i, 20i and the 28i.
It is also different between the 35i and the 35is so that's another difference between them and not just a map.

That's because that chart compares cars with different transmissions.

The quoted figures there are for a 35i manual and a 35is DCT. The 35i DCT will have the same gear and final drive ratio.
Not sure on the reason for the discrepancy in the smaller engine models, possibly a similar story with the 18 and 20 models having the manual stats and the 28 having the slushbox stats.

This is going off the topic that I have already been chastised for but I would assume then that the final drive ratio which can be seen as different between the 35is DCT and the 35i manual would be different again for a 35i auto.

There isn't a 35i slushbox. Only 35i DCT.