07-10-2020, 01:27 PM | #1 |
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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 |
07-13-2020, 08:02 AM | #3 |
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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!
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03-21-2021, 05:18 PM | #4 |
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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. |
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03-22-2021, 10:19 AM | #5 | |
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03-22-2021, 10:23 AM | #6 |
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03-22-2021, 10:26 AM | #7 |
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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 |
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03-24-2021, 12:55 AM | #8 | |
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Excellent research.
I think the B58B30C also have a different integrated exhaust manifold with extra catalyser may also affect the power output. Quote:
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04-26-2021, 03:45 PM | #10 |
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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!
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