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Homebuilt GC8 for Time Attack
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Old 02-16-2017, 08:07 AM   #121
TerryJr
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its not hard to tap 3/8 npt. just need a 9/16" (could proably use a 15mm) drill bit and a 3/8 npt tap. Just dont go too deep with the tap. Its tapered so tap, test, tap test until the sensor fits nice and snug
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Old 02-16-2017, 10:51 AM   #122
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Quote:
Originally Posted by TerryJr View Post
Just dont go too deep with the tap. Its tapered so tap, test, tap test until the sensor fits nice and snug

^^This.
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Old 02-17-2017, 01:19 AM   #123
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I read that recommended drill bit for 3/8 NPT is 37/64 and alternate size is 9/16. In mm it's 14.6844 and 14.2875, so my plan is to get 14.5 mm drill bit, 15 will probably be too much )

Living all my life in metric part of the world, fractional inch sizes are a bit confusing . Not saying that I had to order 1/8 and 3/8 thread taps and wait for three weeks for them. Anyway, most of good and affordable aftermarket stuff comes from USA, so there are no other options )

I tried to put the manifold on top of the engine and it looks that sensor can be mounted on the bottom. Here:
Just enough room to get it in and out with manifold installed and I can't see any problems with the connector as well. Probably will be easier to tap because manifold is flat there. But I still want to try spot on the top. I believe it's the best spot in terms of airflow although wall thickness and rounded shape may require welding the bung in...

By the way, here are my sidefeed fuel rails and rest of fuel system parts:



Definitely an overkill for my stock yellow injectors and expected power levels, but should be fun learning experience. Always wanted to do something with AN fittings )))
Probably should have gone with top feed conversion, but rails with most of AN stuff appeared on ebay in Europe as a kit with nice price tag on them. I think I'll still be able to find bigger side feed injectors If I'll need them someday...
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Old 02-17-2017, 12:09 PM   #124
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Tapping the bottom of the manifold is a bit sketchy. Follow Terry's advice and you should be good.

My experiences. https://www.rs25.com/forums/f145/3391514-post317.html
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Old 02-17-2017, 01:30 PM   #125
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^ good point on the thinness
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Old 02-17-2017, 04:07 PM   #126
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Someone posted up a radium kit the other day that might fit that manifold for topfeeds and use same line stuff. How bigs that plug lookin thing next to bigger vac line port?

Top Feed Fuel Rail Conversion Kit, JDM 99-00 Turbo
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Old 02-19-2017, 12:23 AM   #127
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Top feed kit looks fantastic, but I got all my stuff 30% cheaper incl hose and an fittings . And my manifold is basically 97-98, not sure it will fit.
Regarding that plug - that's interesting. Plug has roughly 15 mm diameter, so should be just fine. And thickness there is much better. If only it was closer to the center... I also don't know what's under the plug. Is it for machining of some channels for IAC? Or for casting purposes? Will it be enough airflow there?
Here are some photos from my other car and while I was stripping paint on this manifold

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Old 02-20-2017, 04:58 AM   #128
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And it's done! )))



Couldn't find the correct drill so ended up giving it to friendly shop
As you can see, that plug thing is no-go because it's basically for ICV channel, it doesn't have free access to the plenum.
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Old 02-20-2017, 05:43 AM   #129
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its in there and will do the job. makes me wonder if they make a right angle plug version of that iat sensor
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Old 02-21-2017, 06:59 PM   #130
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Yes it's a terrible design for us LOL
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