Removing metal structure behind front bumper.
#1
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Has anyone cut the metal out from behind the front bumper and replaced it with aluminium? I saw someone replace it on a V8 RX7 and thought there could be a few KG's to be saved.
![](https://www.miataturbo.net/attachments/race-prep-75/23937-removing-metal-structure-behind-front-bumper-dscn0921.jpg?dateline=1314644310)
![](https://www.miataturbo.net/attachments/race-prep-75/23937-removing-metal-structure-behind-front-bumper-dscn0921.jpg?dateline=1314644310)
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#2
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That part holds the frame legs together a bit.
An extremly tough shock tower brace might replace the function (i.e dump the structural support in front of the subframe).
But I would never touch it, I have had a lot of use to the fat plastic bumper support (the bumper cover lasts much longer when racing).
At the same time, the crumple zone might help you when you run out of luck (but a lighter and more efficient crumple zone can always be developed).
An extremly tough shock tower brace might replace the function (i.e dump the structural support in front of the subframe).
But I would never touch it, I have had a lot of use to the fat plastic bumper support (the bumper cover lasts much longer when racing).
At the same time, the crumple zone might help you when you run out of luck (but a lighter and more efficient crumple zone can always be developed).
#10
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I didn't do it to save weight, I was just clearing up the airflow to the intercooler, so I didn't have the presence of mind to weigh it vs. the steel bar I put in, but it was rather heavy.
I'm sure someone will chime in saying doing so is a bad idea, but my car's been fine for years like this, and sees a lot of hard use.
I'm sure someone will chime in saying doing so is a bad idea, but my car's been fine for years like this, and sees a lot of hard use.
![](https://www.miataturbo.net/attachments/race-prep-75/23958-removing-metal-structure-behind-front-bumper-img00144-20110329-1726.jpg?dateline=1314677317)
#12
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What is that, a transmission cooler? ![Giggle](https://www.miataturbo.net/images/smilies/gay.gif)
Mine is still intact. There isn't much else that locates the frame and thus the front subframe, so I've always been a little nervous about removing it entirely.
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Mine is still intact. There isn't much else that locates the frame and thus the front subframe, so I've always been a little nervous about removing it entirely.
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I would agree with that. However, I'm sure the sentiment is that if you're going to add the weight and the cost of an oil cooler, do it right and get something that will help significantly.
#18
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I've been thinking about putting something there to replace it. Seems like it would help the front end a bit with cooling, that bar is wide. Seems like a good portion of the radiator is behind it. But then again maybe it won't matter.