Undertray with a 20B FD

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Old 08-12-07, 02:02 AM
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Undertray with a 20B FD

Are people using a undertray with the Pettit subframe? I don't have one and it's over 100 degrees everyday here in Vegas. I need to get one. Any suggestions? Thanks.
Old 08-12-07, 08:50 AM
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I don't have the Pettit Subframe, but I am using an undertray with my 20B setup. You should DEFINITELY get an undertray if you don't already have one.

I'm not too familiar with the Pettit set-up, but if you can't get any of the pre-made unndertrays to work, contact a metal shop and they should easily be able to make you one.
Old 08-12-07, 10:54 AM
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Are you also running a fmic? I have the greddy. What thickness metal should i use? Thanks again.


Originally Posted by str8ryd
I don't have the Pettit Subframe, but I am using an undertray with my 20B setup. You should DEFINITELY get an undertray if you don't already have one.

I'm not too familiar with the Pettit set-up, but if you can't get any of the pre-made unndertrays to work, contact a metal shop and they should easily be able to make you one.
Old 08-12-07, 11:35 AM
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I'm also running a Greddy FMIC.


Re Metal: I don't have a good enough answer to give you regarding that. Plastic undertrays are usually quite thin so I would suggest getting something replicated in metal with a similar thickness. Probably 1/2" or less thickness, but that's just an estimate and rough guess.

One of my buddies made his own in metal as well. If you'd like I could contact him and find out how thick his was? Let me know....
Old 08-12-07, 08:06 PM
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Yea.. find out the thickness. I'll make one next weekend..


Originally Posted by str8ryd
I'm also running a Greddy FMIC.


Re Metal: I don't have a good enough answer to give you regarding that. Plastic undertrays are usually quite thin so I would suggest getting something replicated in metal with a similar thickness. Probably 1/2" or less thickness, but that's just an estimate and rough guess.

One of my buddies made his own in metal as well. If you'd like I could contact him and find out how thick his was? Let me know....
Old 08-12-07, 08:20 PM
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Originally Posted by gonzz
Yea.. find out the thickness. I'll make one next weekend..
make 2 and i will buy one
Old 08-12-07, 08:22 PM
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I'll let you know after i make mine..


Originally Posted by allrotor93
make 2 and i will buy one
Old 08-13-07, 08:59 PM
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Hey Mr. G,

You can use any material including some acrylic/plastic type stuff. McMaster Carr has some good stuff cheap. Look under Raw Materials > Plastics > Sheets, Bars... > then look at Acrylic and Garolite.

I'm contemplating going that route when a friend and I are done with our v-mount kits.

Alternatively, Shine Auto Project has one for the FD that they sell for about $150.

From the other Mr. G.
Old 08-13-07, 09:07 PM
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wow 1/2 in seems WAY too thick...I was thinking something along the lines of 1/16?
Old 08-13-07, 09:26 PM
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Thanks Mr. G. lol.. I'll check out the McMaster site. I hear they have some nice stuff..

Originally Posted by gracer7-rx7
Hey Mr. G,

You can use any material including some acrylic/plastic type stuff. McMaster Carr has some good stuff cheap. Look under Raw Materials > Plastics > Sheets, Bars... > then look at Acrylic and Garolite.

I'm contemplating going that route when a friend and I are done with our v-mount kits.

Alternatively, Shine Auto Project has one for the FD that they sell for about $150.

From the other Mr. G.
Old 08-13-07, 09:27 PM
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I was thinking that or 1/8" .. Don't want to weight down the 20B..lol

Originally Posted by charlies7
wow 1/2 in seems WAY too thick...I was thinking something along the lines of 1/16?
Old 08-13-07, 10:00 PM
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LOL...for sure...God knows that dont make power
Old 08-14-07, 10:35 AM
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Originally Posted by charlies7
wow 1/2 in seems WAY too thick...I was thinking something along the lines of 1/16?

That's why I said it was a very rough guess/estimate. You're the metal guy, not me .
Old 08-17-07, 09:01 AM
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^Pettit claims the 20B conversion works better without the undertray but I don't buy it. Would have saved me from my recent Nutria rat incident also I'm going to make one for my car when I get it back. Was going to go the sheetmetal route, something thin. Am going to take some cardboard and fab it up.
Old 08-17-07, 05:51 PM
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^ I can't believe Cam would even say that. The main purpose for the under tray is to help flow the incomming air through the radiator.
Old 08-17-07, 06:03 PM
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fwiw, plastic, acrylic, garolite is a bit more flexible than metal so it will fare better if you happen to hit or tap something like a parking lot curb or a driveway ramp.
Old 08-17-07, 07:54 PM
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Originally Posted by t-von
^ I can't believe Cam would even say that. The main purpose for the under tray is to help flow the incomming air through the radiator.
Yes, they removed mine with the conversion. I'm going to put it back though. Just makes sense for airflow.
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