What size drill and tap - NADS

Hi guys and girls.

I'm starting to think about installing the gauges that arrived last week. I'm just waiting for a gauge pod to arrive so I can butcher it and mould it to the pillar and install them.

My question is, if you were to buy one size of drill and tap to do the EGT and boost gauge connection would you buy 1/8 or 1/4 BSP? I guess either could work but I'm leaning towards 1/4 BSP as I think it could be more useful for other jobs as well and can use a 1/4BSP to 1/8 hose barb where required.

Also do I need straight or tapered for the normal fittings that we would need?

Any thoughts?

Aaron.

Think I might just go and buy this kit for the price.

SCA Tap & Die Set - 24 Piece, Imperial

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Originally Posted by TazManiac

Think I might just go and buy this kit for the price.

SCA Tap & Die Set - 24 Piece, Imperial

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Not sure if its relavent Aaron, but the set you show on sale does not have any BSP taps or dies. It is NPT. This is a problem with US imperial versus British imperial. BSP is British Standard Pipe thread and is the one used most commonly in Australia. It is also the one most likely to be carried by a repairer (Enzed or Pirtek) and is fairly commonly available. NPT is US National Pipe Thread, and is almost the same but is a different pitch. This means you can screw say a 3/8 NTP into a 3/8 BSP but only two or three turns before it locks up. Most auto fittings even on US made cars are BSP.

Thanks man. Saved me from a simple mistake. Cheers.

My EGT gauge came with a nut to weld on to the exhaust pipe. See if you can get one with yours. It saves guessing and would be cheaper and easier than using a tap. If you were fitting the sensor to the exhaust pipe you would need some sort of nut anyway as the pipe wall would not be thick enough to take a thread.

an exhaust place can weld a bung in your exhaust at about 100mm, 150mm post turbo.
You can also buy an adaptor that fits under your boost sensor , they want $75 for them
but easy enough to make one from a small block of aluminium or steel.


http://www.ebay.com.au/itm/Quick-Fit...item35defeb27f

http://www.ebay.com.au/itm/Exhaust-P...item35d939744d

I thought the size for the gauges is 1/8 npt

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Originally Posted by kevin07

I thought the size for the gauges is 1/8 npt

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I think most are Kev. You can use a bsp bung, like the one in my store that TD has linked to because it's a straight thread in the bung and the fitting is tapered it will still screw in fine. It only becomes an issue when the male and the female thread are both tapered.

Thanks guys. Might take it in to an exhaust place soon then as I guess I can screw the sensor in and wait until the pods arrive to wire it up properly. Might just get them to weld another into the intercooler piping and save me the hassle of buying tools and the trouble of doing it myself. Thanks for the help guys.

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Originally Posted by TazManiac

Thanks guys. Might take it in to an exhaust place soon then as I guess I can screw the sensor in and wait until the pods arrive to wire it up properly. Might just get them to weld another into the intercooler piping and save me the hassle of buying tools and the trouble of doing it myself. Thanks for the help guys.

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Yes good idea to get it done if you can prior to gauge fitment. I got two put in my intercooler, one for the electronic sensor for the boost gauge and one for the Dawes valve.

Would be a good spot but i've gotta replace the intercooler soon. It's already leaking.

Most after market intercoolers come with a fitting point for a boost gauge.

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Originally Posted by TazManiac

Would be a good spot but i've gotta replace the intercooler soon. It's already leaking.

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I have two on the pipe coming out of the intercooler at the front of the motor.

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Originally Posted by BillsGU

Most after market intercoolers come with a fitting point for a boost gauge.

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Yeah some do actually. But not all. My aftermarket IC didn't. But it was a cheapy anyhow. Under $400. If the OP's car is the 3Ltr and he has a Dawes fitted, and if the IC he buys has the port already in the IC he can use this...
http://www.ebay.com.au/itm/Branch-Te...item35d674903e

So one end is for the Dawes and the other for the gauge. If the gauge is mechanical that is. Mine is not, it uses an electronic sensor, so I have two separate ports, one for the sensor and one for the Dawes.

My gauge is mechanical so I think I will just use the one bung and t off the boost line of the dawes for the boost gauge when I get the dawes installed.