Re mapping

[Juddy67]

Evening all, so remapping obviously improves Bhp but what about economy and general engine Performance. All advice and knowledge welcome. Thanks in advance.

[Smartbear]

Evening all, so remapping obviously improves Bhp but what about economy and general engine Performance. All advice and knowledge welcome. Thanks in advance.

Hi, it’s only really Diesel engines that benefit from increased economy & petrol engines only get the performance increase.
When you say general engine performance, do you mean torque? That’s increased significantly which gives increased drivability without the need to rev the engine as hard.
Driven in a normal fashion (eg driving to work) mpg is the same as standard, if you drive like a nutter and use the extra power it’s going to use more fuel.
Rob

[Mr Tidy]

OP, you have posted this in the E85/E86 section of the forum. If you have one of those remapping won't make much difference as they all have naturally-aspirated engines.

IIRC Marlon had his 3.0Si remapped and there was a claimed increase of 13 bhp.

But if you have an E89 with a turbo or two (18i, 20i, 28i, 35i or 35is) there are some big gains available!

[Marlon]

Actually it was a claimed 9% increase

[Mr Tidy]

Actually it was a claimed 9% increase

Sorry, I knew I'd get it wrong.

[buzyg]

Actually it was a claimed 9% increase

Awesome. Does your engine feel better for it?

[Marlon]

Actually it was a claimed 9% increase

Awesome. Does your engine feel better for it?

Yes, it did immediately after - I'm used to it now

[mcbutler]

Mapping is not all about BHP and torque alone, it is also about how they are delivered.
OEM maps are for obvious reasons (warranty, manufacturers reputation etc) gentle, even in performance cars, otherwise after sale mapping would do nothing....
You can buy a lambo aventador, remap it and improve it, so ask yourself why the manufacturer does not deliver it as such?!
Most likely because they know it shortens the life and reliability of the vehicle.

On another note I got an email from a tuning company that they have perfected a map for the auto box in the E89, has anyone done that yet??

[djstan]

You can buy a lambo aventador, remap it and improve it, so ask yourself why the manufacturer does not deliver it as such?!
Most likely because they know it shortens the life and reliability of the vehicle.

I'd venture that it's also so they can bring out a more powerful 'S' or 'R' model in a year or two, with very little modifications other than a different map...

[Pbondar]

Mapping is not all about BHP and torque alone, it is also about how they are delivered.
OEM maps are for obvious reasons (warranty, manufacturers reputation etc) gentle, even in performance cars, otherwise after sale mapping would do nothing....
You can buy a lambo aventador, remap it and improve it, so ask yourself why the manufacturer does not deliver it as such?!
Most likely because they know it shortens the life and reliability of the vehicle.

On another note I got an email from a tuning company that they have perfected a map for the auto box in the E89, has anyone done that yet??

I looked at the Celtic tuning ZF8HP450 s/w mod but since I’m not torque limited even with a remap not sure it’s going to do anything for me...

I think you are going to need poky BMW engine with a ZF8HP box and there isn’t one fitted to a Z4 E89...

Maybe for the 40 G29 but that’s a way to go..

[ZedConvert]

Juddy67, I believe the E89 35i kicks our 306 BHP as standard... what you looking for... a rocket

[bazza1]

had my 35i remapped from 306bhp to 360 and 471 nm it flys

[Juddy67]

Thank you and again thank you, its great to get your opinions and comments. I haven’t done this befor with a car never really felt the connection and passion with a car ( always been the 2 wheeled thrill seeker ) but the z4 has definitely changed that !! What a car, I can’t get enough !!!!!!........

[warmasice]

Most likely because they know it shortens the life and reliability of the vehicle.

Does that mean BMW created the 28i with a shorter life span and greater unreliability compared to the 18i? I understand they've got the same engine, just different mapping.

[mcbutler]

It's fairly obvious that if you have two identical machines, one producing say 200 BHP and the other producing 300 bhp the more powerful machine has higher stresses to deal with and as a result it would be reasonable to expect a greater failure rate from that machine.

Going back to me earlier comment, why do you think a lambo aventador 700-4 is delivered with 700BHP but it can easily be tuned to well over 800BHP (remembering that Lambo is all about massive supercar performance).
The reason is that lambo know more failures (warranty claims/reputation) will occur as a result. Also why mapping a new motor invalidates any manufacturer's warranty.

So in answer to your question I would say, all things considered yes!!!!!

HOWEVER (there it is) all said and done, it depends how you drive it, we all know that is what counts in the real world.