Talk:Japanese domestic market

JDM
I've added a couple of paragraphs. Could someone be so kind as to update the links where appropriate please? --210.87.15.130 13:53, 30 September 2007 (UTC)

A nickname for JDM is "Just Drop Money", as importing things like entire cars tends to be very expensive. It is a term heard a lot in auto circles. Perhaps this could be added to trivia? --Ihmhi 01:09, 22 February 2007 (UTC)

The following statement is not only lacking a source, it's also incorrect: "Generally, engines intended for use outside Japan have been detuned because Japanese Gasoline (Petrol) is of a higher octane rating than is generally available in other markets." Almost all domestic cars in Japan are designed to run on "regyura" (unleaded regular) fuel, which until the introduction of "haioku" (unleaded premium) in the 1990s (primarily for use in import cars) was the only grade of gasoline available. Its octane rating is 90 RON, slightly lower than the 91-92 RON regular unleaded available across most of Europe or Australia. The most common gasoline in Europe these days is 95 RON. North America uses a different measurement system: 87 octane AKI (which is regular unleaded in the USA and Canada) is equivalent to 91-92 RON. Therefore it's plain wrong to claim that Japanese gasoline has a higher octane rating than gasoline in other markets. Joewein (talk) 08:20, 28 July 2008 (UTC)

Waffle about JDM being a religion, this shoulf be taken out, as it is not an actual religion, and claims like "a growing number of followers" cannot be verified as it has never been censused.

Fair use rationale for Image:Pyat rublei 1997.jpg
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BetacommandBot 11:29, 6 July 2007 (UTC)

JDM as a style of modifying
What this article doesn't say is JDM referred to as a style of modifying cars and not just the use of Japanese market products. It is somewhat like the ricer burner article, as it has no defined definition, but a vague generalization (e.g. clean and expensive using Japanese market products; “function over fashion.”) Should it be included? References may be difficult to find, however. —Mr Grim Reaper (talk • contribs • email), 15:40, 13 October 2007 (UTC)


 * This is incorrect (as is the article) in that JDM can be used to refer to modifying cars for a particular appearance or using japanese parts to modify the parts. Of course, the problem is should mis-uses of a word be written on this page or not?


 * JDM means Japanese Domestic Market and it is critical the definition should prove all three words of that acronym. Just saying any Japanese or modified with Japanese is JDM is wrong. Sorry to sound rude if I am. JDM can clearly be defined as anything produced intended for use in Japan (hence "Domestic Market").


 * I agree with above that this article doesn't give a very defined definition, but it must be said its actual meaning, not just the North American perceived meaning. BTW, most "JDM" in the United States would be considered fake in Japan. Just having a Japanese make that emulates the appearance seen in Japan doesn't make it JDM.
 * Lostintraslation (talk) 13:57, 20 December 2007 (UTC)

It would be useful to have a section here on the cult status of 'JDM' in the west.CelestialSpore (talk) 15:23, 30 May 2011 (UTC)

JDM as F*ck
I think this should be included in the article...i dont knwo, but someone should explain maybe the JDM as F*ck decals, cuz personally, i wanted to knwo and have searched evrywher to find out and couldnt figure it out cuz i wanted to know the story behind the symbol used for the "u"..just wanted to get this out there.99.251.215.15 (talk) 20:32, 31 July 2008 (UTC)

"Some cars, such as the Nissan GT-R, detect via GPS whether the car is on a Japanese race track. If so, the speed limiter is disabled. [2]" Some cars? What car other than the Nissan GT-R has this feature? It's also important to note that this does NOT occur on every race track, only Nissan approved tracks, which are few in number.

Reply to JDM as F*ck
The yellow and green symbol used is the same as the symbol/colours on the young driver's registration, when it is the orange one it is the colours from the "older drivers" registration, I learned it from a co-worker who frequents Japan coz I wanted to know the origin as well. —Preceding unsigned comment added by 144.131.21.254 (talk) 09:54, 1 October 2009 (UTC)

JDM acronym
The article says "The term Japanese Domestic Market (JDM) is used by companies in Japan to refer to the local market for domestic goods and services". This makes it sound like JDM is a general term used across industries. However, JDM is only used in the custom car scene. Japanese companies of course use JAPANESE words to describe the "local market", specifically 日本市場 (Nihon Shijo), which translates as the Japanese Market.

For evidence, please see the Wiki Japan article: JDM: http://ja.wikipedia.org/wiki/JDM Even if you can't read Japanese, you can see the custom car photo there and translate sentences via Google Translate to see that this a specific term for the custom car scene.

Jimmyhart (talk) 02:15, 26 March 2010 (UTC)

This is a good point that I've included in the introduction sentence to the article. Namely that this term, "JDM" and "Japanese Domestic Market" is a phrase only used by certain automotive customizers, the "import scene", and is not a general term used by the Japanese or US automotive industry.

Mcheath —Preceding undated comment added 23:55, 25 April 2011 (UTC).


 * It is not a "good point" and the Wiki Japan article is not "evidence". JDM is in fact a general industry term, and I will provide refs to support it. —Scheinwerfermann T&middot;C 00:52, 26 April 2011 (UTC)

Your links do not prove or support your assertion. The first link is not a web reference and seems to be about automotive lighting and the second goes to a log in page for a web site in New Zealand about automotive lights. Neither link thus supports anything. Mcheath —Preceding undated comment added 14:07, 26 April 2011 (UTC).
 * What we're discussing here is a fairly arcane bit of automotive-industry jargon, so the sources are not necessarily going to be easily accessed. The sources I provided do indeed support the assertion. You're correct that one of them is not an online reference. There is no requirement for citations to be web-based; many of the best ones are not. The requirement is for assertions to be supported by reference to reliable sources. The other link goes to an automotive lighting industry trade journal article which makes specific and detailed reference to the "JDM" acronym and what it means. You may not be able to see the whole article if you're not a subscriber to the site, but here again, there's no prohibition on subscription-only citations as long as they're reliable, which these are. Because they are difficult to access for those not within the auto industry, I have provided pull quotes in the citations.


 * If you can provide reliable support for your position that the term "JDM" is used by tuners and fanboys, by all means provide it. However, you will not be able to support an assertion that the term is used only by tuners and fanboys, because I have provided support for the term's use in the industry proper. —Scheinwerfermann T&middot;C 20:42, 26 April 2011 (UTC)

Third Opinion

 * While it's true that sources are not required to be web-based or accessible, if there is serious doubt about whether the source actually backs up a challenged statement, then the person using the offline source should provide an excerpt or a convenience copy in order to prove verifiability. It looks like this has been done.
 * That said, it's not really proper to cobble together specific instances of industry or enthusiast use of a term in order to prove that the term is an industry term or enthusiast term. That's bordering on synthesis.  Lacking a source that actually says "JDM is a (whatever) term", we can't really make that claim if it is controversial.  It seems that the more generic lede "JDM is a term", that doesn't make claims about the nature of the term, is all that we can stay with unless we have a source that actually says otherwise.

Gigs (talk) 21:15, 26 April 2011 (UTC)


 * External links that require registration or subscription are indeed unsuitable for Wikipedia referencing. See WP:ELNO criteria #6.
 * I'm not in agreement with either of you, but I think the current text should continue to be used. Wikipedia does not need to comment on whether the term is used by industry professionals or not -- without official literature from automotive OEMs, saying whether or not they use the term officially is pointless. Whether or not the Automotive Global Lighting Catalog thinks it's an official term doesn't really matter to anyone. All that Wikipedia should say in the article is that it's a term used to refer to the Japanese automotive market and culture and its styles and preferences. I don't see any point of including the two lighting catalog links, because they're kind of pointless and there is no argument in the text for them to support, so I am going to remove them, but leave the rest of the text as it is now. Bdc101 (talk) 21:22, 26 April 2011 (UTC)


 * Incorrect. You're mixing up External Links sections with inline citations. Under #6 of WP:ELNO, it says see below. If you click that, it takes you to WP:ELREG, where it says, "A site that requires registration or a subscription should not be linked unless the website itself is the topic of the article (see Official links below) or the link is part of an inline reference (see Wikipedia:Citing sources)". The link to Driving Vision News is acceptable as an aid in finding a source in an inline citation, assuming the source itself is otherwise acceptable. --Dennis Bratland (talk) 23:23, 26 April 2011 (UTC)


 * Here and here are an examples of use of JDM outside the enthusiast market. If this were usa.wikipedia.org, rather than en.wikipedia.org, then articles like this would settle the case that in the United States, it has a Japanophile connotation. But Wikipedia's scope includes the whole world, not only the USA point of view. See also WP:BIAS. --Dennis Bratland (talk) 23:25, 26 April 2011 (UTC)

Headlamps
I have removed the following text from the article: ''This issue can be addressed by replacing headlights with those meeting local standards (e. g. DOT for USA), which is possible for most models produced concurrently for LHD and RHD markets. For example, JDM Toyota Aristo can be fitted with Lexus GS headlamp units from respective market (DOT headlamps in North America or European specification headlamps in Europe) to eliminate the irregular lighting pattern.''

This text is not apposite to this article, which is about JDM vehicles and components—not about modifying vehicles imported from one market to another, which is a subject covered comprehensively in Grey import vehicle and Japanese used vehicle exporting. The statement about JDM headlamps being unsafe for use in right-traffic countries is apposite and, most importantly, is verifiable and supported. Even if the removed text were apposite to this article, it appears to be original research, and is not supported. Adding unsourced material is noncompliant with Wikipedia policy, and this article already contains a great deal of it. More unsourced material aggravates this article's condition, rather than improving it. Moreover, the removed text contained the odd (and unsupportable) statement that JDM headlamps create an "irregular" lighting pattern. Furthermore, Wikipedia is not a how-to manual, providing yet another solid, policy-based warrant for removing poorly-written, unsourced text explaining how to do something not within the scope of the article. —Scheinwerfermann T&middot;C 20:10, 6 January 2011 (UTC)

1. Regarding relationship between JDM and headlight being safety hazard. The whole statement about headlights being a safety hazard is not relevant to JDM as such, and is misleading. Current statement in the article suggests that this hazard is unique to JDM headlights and applies universally. The reality is that safety hazard is a headlight designed for "opposite" traffic, such as an RHD headlight in LHD country or the other way around.

For example, USA DOT headlight would be the same safety hazard in Singapore as Singapore headlight would be in the USA - because USA uses right-hand traffic while Singapore uses left-hand traffic. Note that neither headlight would be JDM in this example.

In a similar way, Canadian headlight is not a safety hazard in USA, and JDM headlight is not a safety hazard in Singapore because both Canada and USA use right-sided traffic while Singapore and Japan use left-sided traffic.

2. Regarding the way to address a safety hazard of headlight designed for a different-sided traffic. It is a matter of fact and verifiable information that safety authorities approve headlight replacement as an adequate and acceptable way of addressing the "opposite headlight" problem. There are numerous examples worldwide, including, but not limited to, Alberta traffic safety regulations or British traffic safety regulations, both stating that replacing the headlight (in case of Alberta - those from RHD to LHD; in case of the UK - the other way around) is an acceptable remedy against the above hazard. Moreover, some vehicle manufacturers such as BMW produce switchable headlights which change lighting pattern depending on switch position - and designed for those drivers who drive in both setups (RHD and LHD) such as French drivers going to UK or the other way around.

There is not a single slightest drop of original research in the statement that headlight replacement is an objective remedy. Please do not confuse Original Research with your personal unawareness.

3. You have also removed another comment regarding VIN numbers. This in fact was directly relevant to JDM - because JDM is probably unique market in that it is not using VIN numbers. The fact that JDM have no VIN has no relationship to grey imports but it is an important feature of the vehicle. Again, my comment (correcting the statement that JDM has 10-number VIN and replacing it with a statement that JDM have no VIN but instead have "Frame Number" that usually contains between 9 and 12 letters and numbers is a matter of fact. Anyone at least remotely familiar with JDM can confirm this, and I can post any given number of photographs as a proof showing that JDM cars use a different designation and do not have a VIN number. These photographs may include photographs of registration documents, service records and actual vehicles.

Again, as with the previous point, I find that the person who was removing remark about VIN in fact confused their own unawareness with original research.

I suggest that you refrain from removing information that you personally don't know just because of your not knowing it as this violates wikipedia rules (Wikipedia:Civility and other). Please use "Citation needed" if you are in doubt before you remove anything. Qsecofr (talk). 05:20, 8 January 2011 (UTC)


 * You're right that the headlamp information was not appropriately written for this article; it was without any context. I have added that context with new text and links about the general export of JDM vehicle components for installation on non-JDM vehicles. I've also changed the language on the headlamp discussion to make it clear that the issue is because the headlamps are for left traffic, not because they are for the Japanese market per se. I have cleaned up the Frame Number information and put it into encyclopædic language, and provided links to the relevant articles about JDM vehicle export. The material about how to convert a JDM vehicle's headlamps for use in a right-traffic country does not belong in this article; it's covered extensively in the articles now clearly linked from this one. Play nice and don't beat other Wikipedians over the head with what you understand to be Wikipedia policy, please and thank you. —Scheinwerfermann T&middot;C 05:36, 9 January 2011 (UTC)

Needs references
There has got to be some better references than a facebook page and a vendor site. How is there this much content with zero actual references? Captainfishpond (talk) 23:16, 26 May 2016 (UTC)

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I have found 2 Wikipedia articles regarding JDM parts that only available in Japan, but not worldwide.
There are 2 parts that has been installed in Japan domestic market cars but not everywhere else. Those includes the speed chime (Japanese Wikipedia article), and Truck speed indicator (Japanese Wikipedia article). The speed chime is best known in anime called Initial D, but the truck speed indicator is relatively obscure (unless if you imported JDM 2nd hand trucks).

Is it a good idea to include those in this article? KhalifFadhillah (talk) 04:14, 28 June 2021 (UTC)