Guys I've got a new TO4E but the oil inlet is different than the last one I had, it's just a threaded hole. It looks like a 1/4"NPT but I am not sure.. any confirmation here? There's a cool hot rod store near my work so I can pick up the fitting after work today.

it is a 1/4" npt

Something else I noticed, the turbo I had on before used a flange mounted onto the oil inlet, to which the delivery hose attached. On the turbo side of the flange the hole the oil actually went through was tiny, this has something to do with forcing the oil in to the turbo bearings? Just curious because if I just go buy an 1/4NPT to -4 adapter will it do the job, or is the part # listed on turbonetics different than this and has a smaller delivery hole?

you need the small delivery hole, AKA "oil restrictor" The rx7 puts out really high oil pressure, especially at start up. It's too much for the turbo to handle, which is why they put the restrictor there.

That's exactly what I thought, is something like this available that is part of the actual fitting or is it accomplished using a restrictor pill? And where could I get either? Thanks for all the help.

Get a regular 1/4npt to -4 fitting. Drill/tap the npt side for a socket head pipe plug (probably 1/16" or 1/8" npt) get a few socket head pipe plugs and drill a few different size holes in the pipe plugs. I'd drill .040, .060, .080 and a .10 hole in each one. Start with the small restrictor and keep changing them out with a bigger one untill the turbine seal starts to let oil past. Once you found the restrictor that is too big then kick it down a notch. Bing! you have a restrictor that is set up for your turbo! https://www.nopistons.com/forums/pub...IR#>/smile.png

Thanks for the info, pretty funny I went over to the other forum and just got done reading your post on this from a while back. Your solution makes sense with parts I can easily get today, perfect!

The restrictor in my oil line is 0.129 inch or 3.28 mm. No smoke even with the higher pressure regulator.

MJW- yeah, seems I post to this question a lot. I like this way because it's tuneable.



MikeL- wow that's a pretty big restrictor! I bet you have an awsome return line. I think the one I ended up with in my TD07 was a .081". I have a 5/8" return, what do you have?

The oil feed line actually came with the GReddy TD06 kit for my 2nd gen. I've used that line for both the T-66 that I had and now for the T04E. The return line is 5/8".