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Old 12-04-2018, 08:26 PM
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Turns out Size Matters.... Head Unit Size ...

Started Research for a 2 DIN Head Unit. Will share details on the buy after Christmas. But, along the way I found some gaps. Head unit size is not mentioned, just references to cutting the Metra Kit.. This is for the head units that are supposed to be Double DIN, not the oversize ones.

So, Data on how Size Matters, At least related to the size of the hole in dash kits.

According to https://en.wikipedia.org/wiki/ISO_7736, US Double DIN is 173.5mm x 101.6 mm. European (and I think rest of the planet) Double DIN is 180 mm x 100.3 mm. In the US, we use inches, so it is about 7 inchs x 4 inches, or 178mm x 102 mm (this is important later). So, 2 standards. Also, this refers to the hole the radio goes in, not the panel in the dash. The standard is based on a panel mount, shove it in from the front. That does not apply here. The radio mounts in the "panel", or hole, and the front of the radio goes through an opening in the pretty part. The opening in the pretty part is the common issue. Our pretty part hole does not match up with the majority of the head units out there. The Metra unit you get from Amazon has the precise US size hole, 173 mm wide. The vast majority of the head units I found on Amazon (several hundred looked at) take the easy way out and go with a 7" x 4" hole, or 178mm wide. The 178mm is why people have to cut the Metra Kit most of the time. The smart manufacturers seem to make the radio face match the 173mm spec, then add a bezel for the head unit to get to either 178 mm or 180 mm. Some even say "works with Metra or Scosche kits". The more thought out ones have 2 or 3 different size bezels. Most of the non smart manufacturers build for the non-US world and do NOT list size. They say "check the dash for fit". When you dig into it, or look closely at the chassis measurements, they are all around the 178mm (7") size with a bezel to get to 180 or larger. You have to cut things for this to work. I guess they figure you will cut things over sending the radio back for not reading the fine print.

I did find some 178 mm and 180 mm kits for for RX8, on ebay, but they were only the face plate. And, they were in Europe or Asia with **** poor reviews and extra shipping. So, the idea here is to think about radio face size before you buy a radio. I can share that the KURATU and ATOTO radios all declare 173mm, others were in the Metra and Scoche compatible category, but I could not find them again for this post.


More Data.. Depth seems is important too..

The depth of the radio, how far it sticks out from the box towards the dash, is another potential issue. I will know more about that after Christmas. I expect I will want to bring the radio forward a bit. But, this is a mod to the depth of the kit, and a cut that will not be seen (unless I really screw up) as opposed to shaving things down and trying to butt up against the radio face, where a 1 mm difference will show.

Mike
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Old 12-04-2018, 09:13 PM
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Old 12-05-2018, 11:41 AM
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No idea, the goal here is to provide data on fitting inside the hole. Now, with one like that, you can do whatever you want to the faceplace. But, you may block AC ducts, hazards and AC controls.

And, there are good threads on the units, I was just trying to share why stuff does not fit in time for Christmas. Although, you bring up a good point. It might be nice to have a list of 173mm head units someplace. If traffic shows up, I can do it here. I listed the two that made the cut. There are more out there, but many had 1 and 2 start reviews.
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