BOV recirculation tube size - MR2 Owners Club Message Board
 
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post #1 of 6 (permalink) Old December 29th, 2016, 12:00 Thread Starter
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BOV recirculation tube size

All,
I did some searching and couldn't find the answer I was looking for, so I thought I would ask.

I have a 93 Turbo, stock with the exception of TCS downpipe, 85mm exhaust, FCD, and an MBC.

There is a brand new Racer X intercooler kit being sold here locally for a screaming deal, only one thing is holding me up- the BOV. The flange is cut for a Tial. I am still running the AFM and would prefer to go ahead and recirculate. Tial makes a QR but I am unsure of the tube size for the nozzle. Also, which spring to order.

What size nozzle and spring should I order?
Here is the QR- TiAL Sport - TiAL QR 50mm

Thank you in advance.
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post #2 of 6 (permalink) Old December 31st, 2016, 13:50
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The BOV is more of a NVH measure than a safety measure.

If you want a simple solution, get a plate to cover the hole on the intercooler pipe, and cap off where it goes back into the intake.

You'll hear more flutter, but like I said, it's a NVH thing.
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post #3 of 6 (permalink) Old January 1st, 2017, 02:28
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Can just get any cheap tial or knockoff bov and run a tube in to its output back in to the intake to make it a recirc, just use the stock recirc pipe and then get a coupler/reducer to go in to the bov vent.
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post #4 of 6 (permalink) Old January 4th, 2017, 17:52 Thread Starter
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Quote:
Originally Posted by australian View Post
Can just get any cheap tial or knockoff bov and run a tube in to its output back in to the intake to make it a recirc, just use the stock recirc pipe and then get a coupler/reducer to go in to the bov vent.
Right, that is kind of my plan. I haven't started taking everything apart and I wondered if anyone knew the diameter of that hose. The QR has a snout that comes out, but its offered in 3 sizes and I wanted to order the right one before I started tearing into it.

I figured out the spring question based on what Tial recommends through their website.
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post #5 of 6 (permalink) Old January 4th, 2017, 23:03
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I think it would depend on the size of the fitting on the intake pipe. If you are using the stock turbo to afm or an aftermarket one like the ko racing. I would measure the fitting on the intake pipe. You have a choice of the Tial outlet fitting of 25.4mm, 29mm, 34mm, 38.1mm. if the fitting on your intake pipe is 25mm I would buy the Tial 25mm option and then buy a 25mm ID silicone hose because it is a bit more flexible or go to Napa and buy a rubber hose that has similar bends to the position of the BOV and intake pipe. When I replaced my intake pipe I had to get rid of the stock BOV outlet tube and I just picked up a hose from Napa that was long and had a 90 degree bend and two hose clamps and it worked fine.
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post #6 of 6 (permalink) Old January 10th, 2017, 12:43
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I'm one for ditching the recirc altogether... cap it... no need to buy much of anything, and less chance of leaks.
Better yet, take it to a TIG welding shop, have them remove the BOV bung and weld a section in to clean things up aesthetically and better flow. Do you have a boost gauge? If not, can have them weld in a plate tapped for a boost line instead.

Cap the intake bung... until you upgrade the intake

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