this might be a stupid question but is it possible to connect the return line to the drain hole?
this way you wouldnt need to replace the oil pan and it would have just 1 hole.....its just a thought but havnt seen anyone do it. im also thinking on how the oil would drain back into the oil pan if u did that.

 

no the drain hole needs to be above the oil level in the pan, so as high up as u can go basiclly

 

Yes, running your oil return to the oil pan's drain would create oil back-up problems. I did an install on a S2000 Comptech S/C kit which used a similar idea for the return to the pan and it created smoking problems on the customers car. The oil would back-up as it was trying to drain.

As soon as we re-routed the oil drain to the top of the oil pans all problems went away.

 

Well, for my turbo I'll be putting a new tap in the block instead of the pan, above the oil line. This reduces the backpressure on the return line and hopefully lowers the overall oil pressure at the seals, reducing the chance of blowing them.

 

i dont think that sounds like a good idea, their might be a chance of sacrificing block integrity, running the drain very high in the oil pan sounds safer

 

x2

IMO...run it to the top of the pan like EVERYONE else does and you WON'T have a problem.

 

Sorry for the confusion, this is for a 1NZ-FE. I know this is a tC forum, but there's isn't a lot going on in the 1gen xB / xA areas, everyone just slaps a greddy kit on and calls it a day, not much innovation or custom setups other than a very few. Where I'd be tapping is below the crank on the lower block, not the mid-block, there's no pressure there. If you're familiar with the xB oil pan, it may as well be called an oil plate, it's pancake flat. There's no room except for the very bottom.

 

Have you heard of anyone having problems with the oil return line on the Greddy kits?? Also, do you know where Greddy routes the oil return for their kit?

IMO, if you haven't heard anything bad about the Greddy's I would take advantage of the R&D they've already done and just put it where their's goes.

Tapping the block just seems like a SUPER over kill.

 

Yes, I actually have heard of problems with the Greddy kit. For the return they weld a tube to the underside of the pan, i.e. it sits lower than the pan. There has been reports of the weld failing or cracking it if something gets hit and goes under the vehicle, and an oil leak from the bottom of the pan is very bad. With the weld and tube intact I have not heard of an issue with the returns, though I have also heard of blowing the oil seals on the turbo. The xB puts out a high oil pressure, over 80 psi at times when on the gas, so anything to lower pressure at the seal without reducing flow would be good IMO.

I know Greddy is a big name, but from what I've seen from their designs they are far from optimum, otherwise people wouldn't be upgrading on the tC to Descendant, PTuning, Dezod and other turbo kits. The xB supercharger tensioner pulley design was poor and prone to failure, and their positioning of the bypass valve actuator rubs against the main engine harness. The turbo oil feed line has failed on xa007xa, resulting in an engine fire, and running a t-tap off of the stock oil pressure sensor mount could stress the fitting, especially when the supplied adapter from Greddy is brass. I also wish Greddy had mounted the turbo below the manifold instead of above. The Mitsubishi TF34 turbo they use has a water jacket, but is useless to use in lieu of a turbo timer since it's above the water table.

I wish Zach or Paul could chime in on this, tapping the lower block was recommended by Zach from 365motorwerks for their turbo, which I will be swapping my currently installed Greddy for when the built block goes in. Hopefully this isn't considered thread-jacking, I'll go crawl back to the xB forums now.