Genpu CS skidplate/under-tray review

Discussion in 'Mazdaspeeds.org Official Parts Reviews Section' started by macdiesel, Oct 12, 2019.

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  1. macdiesel

    macdiesel Platinum Member

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    I’ve been battling a slowly dying factory under-tray over the years. Autocross, hpde’s, and wintercross had taken its toll on my under-tray. I guess I hit a lot of cones. Mounting points were breaking left and right. Zip ties and Gorilla Glue tape were becoming the norm to hold my tray together. Last April I decided to make the leap on a CS under-tray. A broken foot delayed the CS trays install until recently. It’s a nice piece. I won’t go into the installation so much. CS provides detailed instructions. Pretty solid and straight forward. I will share my experience installing and a pointer or two.

    Overall, impressed with the kit. Comes with everything to install. It’s a stout piece. Newer version is a 2-piece design. Small piece bumper to radiator support Andy large piece radiator support all the way back to cross member. Hopefully, the CS will provide some additional structural support for the front bumper as well. Had a few snags installing but nothing major. Pics below.

    Old tray. So many busted up attachment points. Tape and zip ties were starting to become too common place.
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    One of the radiator support u-bolts broke off some time ago. I cut a piece off a small L-bracket and screwed it in. The u-bolt slipped right over it.

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    One issue I ran into is that the CS kit comes with 6mm bolts to connect to the radiator support u-bolts. For some reason my car has 8mm u-bolts attached to the radiator support. Circled below in white. I had some 6mm u-bolts laying around and swapped them in. No biggie. I wish the four bolts CS supplied to mount the side of the tray (green circles at rear) were a tad bit longer. I really had to push the CS tray up to connect to the wheel well linings. I might Home Depot some longer bolts in the future.
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    Radiator support oem u-bolt on left. CS supplied u-bolt on the right.
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    One tip I’d seriously recommend before installing is to make sure you can thread the bolts into the 4 connecting points on the subframe. Exposed to the elements, they had some rust build up. Not terrible. Depending on where you live and the age of your speed3 I’d imagine the threaded holes could be a clusterfuck. You could use a chaser. Mine weren’t too bad. I used some liquid wrench and slowly screwed the bolts in and out. Two of the bolts took a bit to work in and out. I used an impact and throttled the trigger. Three of the mounting points are in the pic. One more is to the right. Pretty much the only four spots to screw a bolt into on the cross member. The CS instructions points them out.
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    Test fitted to mark the holes for the Damond catch cans. Not perfect but close enough. For some reason I didn’t snap a pic fully installed but the front piece went on in a snap.
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    Overall I’m happy with the CS under-tray. Comes well packaged and has great instructions. I’d recommend it to anyone. I know a lot of folks tend to leave them off but if you’re looking to replace it with an upgraded version. Check it out.
     
    macdiesel, via an iPad, Oct 12, 2019
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  2. Easter Bunny

    Easter Bunny Professional Engineer Platinum Member

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    For those with no undertray. The undertray is part of managing airflow through the radiator and front mount intercooler if you have one. Put it back on
     
    Easter Bunny, via a mobile device, Oct 12, 2019
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  3. Mauro_Penguin

    Mauro_Penguin Punk in Drublic Motorhead Platinum Member

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    Looking at this thing over again, it doesnt seem to have any provisions for pulling air pressure out of the engine bay like the stock one.

    I think instead that it bolts to the subframe. Or maybe I am looking at it wrong?
     
    Mauro_Penguin, via a mobile device, Oct 14, 2019
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  4. macdiesel

    macdiesel Platinum Member

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    It does attach to the the subframe at 4 points but it’s not completely sealed in the rear. There are spacers that connect between the tray and the radiator support so there is a small gap between the radiator and tray (can be seen in pics). Perhaps that small gap under the radiator allows air to escape out the back. Not an engineer at all.

    With that, I’m not concerned. I have never had cooling issues before so if I have any after 2 autocross events this weekend then I’ll know.
     
    macdiesel, via an iPad, Oct 15, 2019
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  5. macdiesel

    macdiesel Platinum Member

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    No cooling issues after driving over 3 hours to and fro with 7 autocross runs.

    Did accrue some damage from the one cone I hit today. Bent the large plate up and can see cone mark after. The last autocross for the season is tomorrow so if I don’t get anymore damage I’ll probably self-tap it together.

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    macdiesel, via an iPhone, Oct 19, 2019
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  6. ToyCop

    ToyCop Greenie Member

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    I have the one piece version and it has been great, especially going down my dirt road.
     
    ToyCop, via an iPad, Oct 26, 2019
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