Thread: Oil Restrictor Question

Not your typical question of whether or not I need one.

Does placement of the restrictor matter? I need to add one to my oil feed for my GT2871R. However, due to some specific reasons I can not place the restrictor at the turbo. Would it cause any issues to put the restrictor at the block?

This is on a W10 DET so the feed line is only 1ft 6" long or so (maybe a bit shorter). I'm also using -4an sizes (lines/fitting, etc...).

I just want to make sure this isn't going to somehow cause me to oil starve the turbo if the restrictor is placed at the block.

Thanks.

Shouldn't matter AFAIK. I had a .060 restrictor on my T28 at the block without issue for a few thousand miles.....

gt2871r needs a .035 restrictor and it can be placed any where in line before the turbo.

Looking at my post I am glad you pointed out the proper size, I made it seem like he needed a .060...

I switched to a GT28RS but I used the ATP restrictor which mounts on the turbo...

.060 is what a small frame scroll bearing turbo takes.

That I know... I wasn't clear in my posts at all....

.060 journal bearing turbo

.035 ball bearing turbo

It doesn't matter where the restrictor is placed in line between the block and the turbine. Think of the restrictor as a control valve on a water hose. You can adjust it to be whatever pressure you want, and it doesn't matter if you install it at the spicket or on the end of the hose.

The ONLY thing that would make it matter, is what type of line you're using for the feed of the turbo. Obviously, you're using a braided line or a stock type line, so oil pressure will not adversely effect the line itself.

I for one prefer the banjo restrictor, because for the most part, you won't need to run any adapters to the feed port on the turbine from the banjo adapter on the block.

I already knew which size restrictor I need (.035), but thanks. lol.

Thanks for the help guys. Tekke, that was a great analogy. Also, I wasn't aware I can get a banjo restrictor. Damn. I just got a restrictor that normally threads into the turbo and then just got fittings so that I can make it inline. Oh well! I was hoping there was a place that made a -4 input with a -4 output restrictor but couldn't find one. Only -4 out put to 1/4" inverted flare.

-4 size Oil inlet fitting for GT28/30/35R with built-in restrictor : atpturbo.com=

ATP Turbo carries what you were looking for. -4AN input and -4AN output. .035" restrictor.

That's actually what I bought. They said it's actually a 1/4" inverted flare. I called them and asked. It's meant to be threaded into the turbo. So I had to get an adapter to make it inline.