BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW Z4 Forums (G29) BMW Z4 (G29) General Forum Z4 m40i UK tuning options

Post Reply
 
Thread Tools Search this Thread
      07-10-2020, 01:27 PM   #1
BeamerBlood
Registered
1
Rep
1
Posts

Drives: BMW Z4 m40i, BMW G11 740d LCI
Join Date: Jul 2020
Location: Windsor

iTrader: (0)

Z4 m40i UK tuning options

Hi Guys,
New here and the very proud owner of a new m40i in Misano Blue with high shadow gloss pack. I’ve got to say, I’m so impressed with this car so far. I’ve also just got a g11 740d LCI for the motorway munching and for different reasons so impressed with that too!

So, I’ve been looking at tuning options for the 40i in the UK. BM3 is clearly very popular at the moment, but I’d quite like a reputable specialist to advise on downpipes and air boxes so I can look at Stage 2 and really open her up. Not really interested in headline BHP, but just drivability.

I’m based in Windsor. Who would you guys recommend? And lastly, I’m guessing a Circa £1.5k-£2k budget be sufficient for these mods including fitting for the hardware?

All the best
Chris
Appreciate 0
      07-13-2020, 04:44 AM   #2
Robsey
New Member
11
Rep
22
Posts

Drives: Z4 M40i
Join Date: May 2020
Location: Kent, UK

iTrader: (0)

I think this would screw the warranty up wouldn't it? I'm waiting until the car is 3 years old, then going get a few tuning bits done to it.
Appreciate 0
      07-13-2020, 08:02 AM   #3
Chabu
Enlisted Member
Chabu's Avatar
United_States
21
Rep
35
Posts

Drives: z4 s30i
Join Date: Mar 2020
Location: Delaware

iTrader: (0)

Quote:
Originally Posted by Robsey View Post
I think this would screw the warranty up wouldn't it? I'm waiting until the car is 3 years old, then going get a few tuning bits done to it.
I'm with you and would do the same but I get new car crazy after a couple years and usually trade up before expiration. Also, I'm too timid to hold a BMW without a warranty - protecting me from the high repair cost. So, I'm always a bit jealous of the tuners but never in a position to use one!
__________________
Appreciate 0
      03-21-2021, 05:18 PM   #4
GoLacrity
Registered
0
Rep
1
Posts

Drives: BMW Z4 M40i
Join Date: Mar 2021
Location: UK

iTrader: (0)

Hi, nice choice.
I got eactly the same specs last year and love the looks.
Even had some passers by take photos, which is a flattering experience.

My question is, if the USA model is essentially the same car but with an software tuneup by BMW, then does that mean an ‘official’ tune is available that we can use from the US version?

I’m thinking a clone of the tune would provide the performance benefits but i guess some warning codes for different parts would need sorting first.

Love to find out if that is possible as would be legitimate from using original BMW software for this model.
Appreciate 0
      03-22-2021, 10:19 AM   #5
DPelletier
Lieutenant
Canada
675
Rep
556
Posts

Drives: 2020 Z4 M40i
Join Date: May 2019
Location: Kelowna, B.C. Canada

iTrader: (0)

Garage List
2020 Z4 M40i  [7.00]
Quote:
Originally Posted by GoLacrity View Post
Hi, nice choice.
I got eactly the same specs last year and love the looks.
Even had some passers by take photos, which is a flattering experience.

My question is, if the USA model is essentially the same car but with an software tuneup by BMW, then does that mean an ‘official’ tune is available that we can use from the US version?

I’m thinking a clone of the tune would provide the performance benefits but i guess some warning codes for different parts would need sorting first.

Love to find out if that is possible as would be legitimate from using original BMW software for this model.
While I'm certain it's possible to tune the EU version to equal or exceed the 382hp version we get elsewhere (not just in the US ;-) ) , there are several hardware differences and the motors are actually a separate model number.

Dave
Appreciate 0
      03-22-2021, 10:23 AM   #6
DPelletier
Lieutenant
Canada
675
Rep
556
Posts

Drives: 2020 Z4 M40i
Join Date: May 2019
Location: Kelowna, B.C. Canada

iTrader: (0)

Garage List
2020 Z4 M40i  [7.00]
Appreciate 0
      03-22-2021, 10:26 AM   #7
DPelletier
Lieutenant
Canada
675
Rep
556
Posts

Drives: 2020 Z4 M40i
Join Date: May 2019
Location: Kelowna, B.C. Canada

iTrader: (0)

Garage List
2020 Z4 M40i  [7.00]
I found my previous post:

No. While I'm sure you can get the UK spec engine to produce as much or more power than the non-UK version, they are different engines. The UK version is a B58B30M1 whereas the "non UK" market uses the B58B30O1.


a related article (the Supra uses the B58B30M1);

Why the Toyota Supra Makes Less Power Than the BMW Z4
The engines are nearly equal, but not equal enough.

The Toyota Supra shares a platform and a large majority of its components with the BMW Z4. But as we discovered last summer and recently confirmed, the Z4 will make 47 more horsepower than the Supra in top trim. Since ECU tuning has become so advanced with modern engines, the automatic response might be to think that it is all in the programming. A BMW parts catalog reveals that the changes go further than the code.

According to the BMW ETK catalog, the US variant of the Supra will be equipped with the B58B30C engine. It carries part number 11002463592, and seems very similar to the engine for the US-spec Z4 M40i. However, the Z4 engine is actually the B38B30B, and has part number 11002464415. What does that mean? There are internal differences. Searching the interchanges for the two part numbers shows that the US Supra engine is the same as what Europeans will see in their variant of the Z4 M40i, while the US M40i engine will be used in the new G20 M340i 3-series.

Digging into the motors reveals that the first different part is the cylinder head. The Z4 has a cylinder head part number of 11127934495 while the unit in the Supra is marked as 11127934494. The differences are not apparent based on the catalog illustration, and instead are likely to be in the castings of the cylinder heads as both use the same exact camshafts, valves, and ancillary components.

Moving to the bottom end, both engines use the same crankshaft and bearings, but the pistons and connecting rods are different. The Z4 piston–part number 11258678934–is found in a variety of BMW products including the US M340i and European spec 7-series sedans. The Supra piston–part number 11258681079–is found in the motor for the US spec 7-series and the X7.

Based on the catalog entries, basically every other component seems to be the same. The final difference appears to be in the turbocharger. The Z4 uses part number 11657934387, which is only shared with the M340i, while the Supra uses part number 11657934332, which is only shared with the Euro-spec Z4 M40i. Even though the turbocharger appears to be different, all of the clamps and mounting hardware are the same between the two. Even though the unit on the Z4 might have bigger wheels in it, there is a good chance that it should bolt right up to the Supra.

The hardware for the ECU is even the same; the two cars share the 86T0 DME. After looking at the parts, it doesn't look to be very hard to replicate the power of the M40i in the Supra.

For those that want to make an OEM equivalent, the primary components to change will be the pistons and rods as those are likely built to withstand a little more boost. Swapping the cylinder head and turbocharger would complete the package. A tune will take advantage of all of those components.

We’re likely to see tuner shops digging into these cars as soon as they hit the ground. Based on what I see here, it likely won't be very complicated for them to make even more power than the Z4 M40i.

cheers,
Dave
Appreciate 2
      03-24-2021, 12:55 AM   #8
Bigmouth Studio
Lieutenant
Bigmouth Studio's Avatar
Hong Kong
283
Rep
514
Posts

Drives: BMW Z4 M40i
Join Date: Jun 2010
Location: HKSAR

iTrader: (0)

Garage List
Excellent research.
I think the B58B30C also have a different integrated exhaust manifold with extra catalyser may also affect the power output.


Quote:
Originally Posted by DPelletier View Post
I found my previous post:

No. While I'm sure you can get the UK spec engine to produce as much or more power than the non-UK version, they are different engines. The UK version is a B58B30M1 whereas the "non UK" market uses the B58B30O1.


a related article (the Supra uses the B58B30M1);

Why the Toyota Supra Makes Less Power Than the BMW Z4
The engines are nearly equal, but not equal enough.

The Toyota Supra shares a platform and a large majority of its components with the BMW Z4. But as we discovered last summer and recently confirmed, the Z4 will make 47 more horsepower than the Supra in top trim. Since ECU tuning has become so advanced with modern engines, the automatic response might be to think that it is all in the programming. A BMW parts catalog reveals that the changes go further than the code.

According to the BMW ETK catalog, the US variant of the Supra will be equipped with the B58B30C engine. It carries part number 11002463592, and seems very similar to the engine for the US-spec Z4 M40i. However, the Z4 engine is actually the B38B30B, and has part number 11002464415. What does that mean? There are internal differences. Searching the interchanges for the two part numbers shows that the US Supra engine is the same as what Europeans will see in their variant of the Z4 M40i, while the US M40i engine will be used in the new G20 M340i 3-series.

Digging into the motors reveals that the first different part is the cylinder head. The Z4 has a cylinder head part number of 11127934495 while the unit in the Supra is marked as 11127934494. The differences are not apparent based on the catalog illustration, and instead are likely to be in the castings of the cylinder heads as both use the same exact camshafts, valves, and ancillary components.

Moving to the bottom end, both engines use the same crankshaft and bearings, but the pistons and connecting rods are different. The Z4 piston–part number 11258678934–is found in a variety of BMW products including the US M340i and European spec 7-series sedans. The Supra piston–part number 11258681079–is found in the motor for the US spec 7-series and the X7.

Based on the catalog entries, basically every other component seems to be the same. The final difference appears to be in the turbocharger. The Z4 uses part number 11657934387, which is only shared with the M340i, while the Supra uses part number 11657934332, which is only shared with the Euro-spec Z4 M40i. Even though the turbocharger appears to be different, all of the clamps and mounting hardware are the same between the two. Even though the unit on the Z4 might have bigger wheels in it, there is a good chance that it should bolt right up to the Supra.

The hardware for the ECU is even the same; the two cars share the 86T0 DME. After looking at the parts, it doesn't look to be very hard to replicate the power of the M40i in the Supra.

For those that want to make an OEM equivalent, the primary components to change will be the pistons and rods as those are likely built to withstand a little more boost. Swapping the cylinder head and turbocharger would complete the package. A tune will take advantage of all of those components.

We’re likely to see tuner shops digging into these cars as soon as they hit the ground. Based on what I see here, it likely won't be very complicated for them to make even more power than the Z4 M40i.

cheers,
Dave
Appreciate 0
      03-24-2021, 04:34 PM   #9
JustChris
General
JustChris's Avatar
No_Country
17423
Rep
25,086
Posts

Drives: Tesla MYRWD
Join Date: Jul 2013
Location: UK

iTrader: (0)

U.K. you can go AC Snitzer route and they will back your warranty.
__________________
My car made front page of Bimmerpost
Appreciate 0
      04-26-2021, 03:45 PM   #10
z4viper
Enlisted Member
66
Rep
38
Posts

Drives: BMW Z4 G29, BMW X1 F48
Join Date: Apr 2021
Location: London

iTrader: (0)

Mine is brand new so I'm not going to touch it really, I think I'm going for some exhaust tips to really capture that Sport+ exhaust better - anyone know what the inlet diameter is for the 20i? Cheers!
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 04:01 AM.




bmw
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST