DEFI BF install -Step by step with pics - 24 May - INSTALL COMPLETE - Page 4

supermarkus · 05-22-2007, 09:10 AM

You can't just call it 1/8 thread and expect it to be the same. The 1/8 thread used on Subarus is 1/8-28 BSPT which is slightly different than the 1/8-27 NPT thread commonly used with USDM gauges. OP is calling the Defi sensor 1/8 PT which is slightly misleading, IIRC it is 1/8-28 BSPT so it matches up fine with the stock oil galley threaded plug. You can use a 1/8-27 NPT sender, just wrap it up a couple of turns with teflon tape and you should be fine, there are plenty of people that are running this way. Personally, I don't do things like that, but I have access to pretty much any machinery I need to change the threads or make my own plugs.

sdkim7 · 05-22-2007, 02:03 PM

Quote:

Originally Posted by supermarkus

You can't just call it 1/8 thread and expect it to be the same. The 1/8 thread used on Subarus is 1/8-28 BSPT which is slightly different than the 1/8-27 NPT thread commonly used with USDM gauges. OP is calling the Defi sensor 1/8 PT which is slightly misleading, IIRC it is 1/8-28 BSPT so it matches up fine with the stock oil galley threaded plug. You can use a 1/8-27 NPT sender, just wrap it up a couple of turns with teflon tape and you should be fine, there are plenty of people that are running this way. Personally, I don't do things like that, but I have access to pretty much any machinery I need to change the threads or make my own plugs.

Oh wow, I didn't know that. I apologize for my noobness. I am still a bit confused, you're saying that I can use the either sensor, to get oil temp but I might have to wrap with teflon tape to help it fit right?

supermarkus · 05-22-2007, 03:02 PM

Teflon tape is good insurance with any of these tapered thread fittings. The only time I don't use Teflon tape is when I'm using Swagelok type fittings or fittings where the nuts have potential to split. I'm not specifically saying you can use either sensor, I'm saying you will have one sensor or the other supplied by the gauge manufacturer. While you can thread the NPT into the subaru part, BSPT and NPT are not the same threads. At some point you will be making your own threads in the plug, which isn't ideal in my opinion. I don't wish to add metal to my oil if I can help it. You can also buy BSPT to NPT conversions, there were several threads on nasioc about them a while back, I don't know if that info has migrated to this site.

05_GD7 · 05-23-2007, 04:21 AM

Just to aleviate confusion:

The Subaru plug is BSPT (otherwise known as PT)
The DEFI Oil Pressure sensor is BSPT (PT)
The METRIC (celcius) DEFI Oil Temperature sensor is BSPT (PT)
The IMPERIAL (farhenhiet) DEFI Oil Temperature sensor is NPT

The Oil pressure sensor comes with BSPT to NPT adaptor, so that you can install your pressure sensor into an NPT hole, commonly found on oil filter sandwich adapters.

DEFI recommends in the instructions that you use teflon tape, regardless of whether your inter-mixing PT and NPT threads.

sdkim7 · 05-23-2007, 07:18 AM

Quote:

Originally Posted by 05_GD7

The Oil pressure sensor comes with BSPT to NPT adaptor, so that you can install your pressure sensor into an NPT hole, commonly found on oil filter sandwich adapters.

This is where I'm having the issue...the oil filter adapters don't fit the 06 WRX...found that out the hard way

. So I'm trying to find an alerternate way of installing the sensor which is 1/8 NPT to get a reading for oil temp. I've been searching around for an adapter that goes from the 1/8 NPT to BSPT but the problem there is the temp prob doesn't actually make it all the way down cause the adapter is in the way so I'm affraid I won't get a good reading...

05_GD7 · 05-23-2007, 01:35 PM

Quote:

the problem there is the temp prob doesn't actually make it all the way down cause the adapter is in the way so I'm affraid I won't get a good reading...

Remember that the oil system is pressurized in those gallery areas. Your temperature sensor doesn't necessarily have to be protruting into any oil flow per se to get a reading (as you would with say, EGT). With pressures upwards of 100psi, the oil will push itself up into that adapter and the probe will take a reading with no ill effects.

05_GD7 · 05-24-2007, 04:26 PM

Bump for the final stage

zell_06 · 05-27-2007, 08:00 PM

Good luck with the install everyone.

slyguySTI · 05-28-2007, 01:08 AM

damn. glad its done, superb write up, thanks

STIfreak7 · 06-01-2007, 08:36 PM

In the middle of my install now, finishing it up tomorrow (hopefully) Where can I get a NPT to BSPT adapter for the Imperial oil temp gauge, didnt know I would need one, but glad to find out ahead of time.

05_GD7 · 06-02-2007, 04:47 AM

Try www.egauges.com

Few other places you could try:
- Home Depot
- Any autoparts store

supermarkus · 06-02-2007, 09:24 PM

you missed this thread?

What is needed for 1/8 NPT OP Sender in Galley plug install?

HDMLNIUM · 06-21-2007, 10:36 AM

Nice write up, I started my install last night going by your write up.
Thanks for taking the time to do a how to on this.

Bill

skibbz · 07-20-2007, 05:39 PM

Nice tutorial, it's much appreciated

Gouki · 07-22-2007, 08:41 PM

Great write up. I just bought a set of STI GEnome gauges on ebay, can't wait to install. I also have the accesory STI red intercooler hose to put on too.

05-22-2007, 09:10 AM	#46
supermarkus Spec C Club Car: 08 STi, SSM Location: Edmonds Washington Posts: 1,441 Join Date: Dec 2005 Trader Rating: (0)	Re: DEFI BF install -Step by step with pics You can't just call it 1/8 thread and expect it to be the same. The 1/8 thread used on Subarus is 1/8-28 BSPT which is slightly different than the 1/8-27 NPT thread commonly used with USDM gauges. OP is calling the Defi sensor 1/8 PT which is slightly misleading, IIRC it is 1/8-28 BSPT so it matches up fine with the stock oil galley threaded plug. You can use a 1/8-27 NPT sender, just wrap it up a couple of turns with teflon tape and you should be fine, there are plenty of people that are running this way. Personally, I don't do things like that, but I have access to pretty much any machinery I need to change the threads or make my own plugs. This ad is not endorsed by this member. Please register or login to hide this ad.

05-22-2007, 03:02 PM	#48
supermarkus Spec C Club Car: 08 STi, SSM Location: Edmonds Washington Posts: 1,441 Join Date: Dec 2005 Trader Rating: (0)	Re: DEFI BF install -Step by step with pics Teflon tape is good insurance with any of these tapered thread fittings. The only time I don't use Teflon tape is when I'm using Swagelok type fittings or fittings where the nuts have potential to split. I'm not specifically saying you can use either sensor, I'm saying you will have one sensor or the other supplied by the gauge manufacturer. While you can thread the NPT into the subaru part, BSPT and NPT are not the same threads. At some point you will be making your own threads in the plug, which isn't ideal in my opinion. I don't wish to add metal to my oil if I can help it. You can also buy BSPT to NPT conversions, there were several threads on nasioc about them a while back, I don't know if that info has migrated to this site.

05-23-2007, 04:21 AM	#49
05_GD7 Spec C Club Car: 05 STi - Black Fav Mod: No Lien Location: Ontario, Canada Posts: 1,801 Join Date: Mar 2006 Trader Rating: (2)	Re: DEFI BF install -Step by step with pics Just to aleviate confusion: The Subaru plug is BSPT (otherwise known as PT) The DEFI Oil Pressure sensor is BSPT (PT) The METRIC (celcius) DEFI Oil Temperature sensor is BSPT (PT) The IMPERIAL (farhenhiet) DEFI Oil Temperature sensor is NPT The Oil pressure sensor comes with BSPT to NPT adaptor, so that you can install your pressure sensor into an NPT hole, commonly found on oil filter sandwich adapters. DEFI recommends in the instructions that you use teflon tape, regardless of whether your inter-mixing PT and NPT threads.

05-24-2007, 04:26 PM	#52
05_GD7 Spec C Club Car: 05 STi - Black Fav Mod: No Lien Location: Ontario, Canada Posts: 1,801 Join Date: Mar 2006 Trader Rating: (2)	Re: DEFI BF install -Step by step with pics Bump for the final stage

05-27-2007, 08:00 PM	#53
zell_06 Junior STI Driver Car: 05 Subaru WRX STi Fav Mod: Short Shifter Location: MD/DC/VA area Posts: 59 Join Date: Apr 2006 Trader Rating: (0)	Re: DEFI BF install -Step by step with pics - 24 May - INSTALL COMPLETE Good luck with the install everyone.

05-28-2007, 01:08 AM	#54
slyguySTI Spec C Club Car: 06 STI Fav Mod: Your MOM!! Location: Kentuckiana Posts: 1,217 Join Date: Aug 2005 Trader Rating: (4)	Re: DEFI BF install -Step by step with pics - 24 May - INSTALL COMPLETE damn. glad its done, superb write up, thanks

06-01-2007, 08:36 PM	#55
STIfreak7 Senior STI Driver Car: 06 Yamaha R6 Raven Fav Mod: NO car payments!! Location: Winston-Salem, NC Posts: 309 Join Date: Mar 2005 Trader Rating: (2)	Re: DEFI BF install -Step by step with pics - 24 May - INSTALL COMPLETE In the middle of my install now, finishing it up tomorrow (hopefully) Where can I get a NPT to BSPT adapter for the Imperial oil temp gauge, didnt know I would need one, but glad to find out ahead of time.

06-02-2007, 04:47 AM	#56
05_GD7 Spec C Club Car: 05 STi - Black Fav Mod: No Lien Location: Ontario, Canada Posts: 1,801 Join Date: Mar 2006 Trader Rating: (2)	Re: DEFI BF install -Step by step with pics - 24 May - INSTALL COMPLETE Try www.egauges.com Few other places you could try: - Home Depot - Any autoparts store

06-02-2007, 09:24 PM	#57
supermarkus Spec C Club Car: 08 STi, SSM Location: Edmonds Washington Posts: 1,441 Join Date: Dec 2005 Trader Rating: (0)	Re: DEFI BF install -Step by step with pics - 24 May - INSTALL COMPLETE you missed this thread? What is needed for 1/8 NPT OP Sender in Galley plug install?

06-21-2007, 10:36 AM	#58
HDMLNIUM Junior STI Driver Car: 07 STI Fav Mod: Cosworth block Location: Maine Posts: 60 Join Date: Apr 2007 Trader Rating: (1)	Re: DEFI BF install -Step by step with pics - 24 May - INSTALL COMPLETE Nice write up, I started my install last night going by your write up. Thanks for taking the time to do a how to on this. Bill

07-20-2007, 05:39 PM	#59
skibbz Junior STI Driver Posts: 172 Join Date: Oct 2006 Trader Rating: (1)	Re: DEFI BF install -Step by step with pics - 24 May - INSTALL COMPLETE Nice tutorial, it's much appreciated

07-22-2007, 08:41 PM	#60
Gouki Junior STI Driver Car: 2007 WRX STi Fav Mod: Dual OEM subwoofer daisy chain Location: San Francisco/Dublin Posts: 193 Join Date: Nov 2006 Trader Rating: (1)	Re: DEFI BF install -Step by step with pics - 24 May - INSTALL COMPLETE Great write up. I just bought a set of STI GEnome gauges on ebay, can't wait to install. I also have the accesory STI red intercooler hose to put on too. This ad is not endorsed by this member. Please register or login to hide this ad.