I am putting a Garrett TO4E .60/.84 on my S4 TII motor. I am running -4 AN from the front iron to the turbo, and purchased the undrilled oil feed flange from ATPTurbo. I have been searching for the proper "restrictor" size, and have seen too much conflicting info to be sure. Any opinions based on first hand experience would be much appreciated.

Nate

 

from what i have read, people say don't use a restrictor for non BB turbos. i just installed my 35R without the restrictor and have no smoking on start up and short drive to my fabricator to get the downpipe made.
these are the fittings i used,
feed line http://www.atpturbo.com/Merchant2/me..._Code=ATP-OIL1

oil inlet from turbo -[url]http://www.atpturbo.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=ATP-FTG-029&Category_Code=ATP-OIL2

45 degree swivel just in case -[url]http://www.atpturbo.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=ATP-FTG-017&Category_Code=ATP-OIL2

banjo adapter from front iron http://www.atpturbo.com/Merchant2/me...egory_Code=BCS

oh by the way the length of the oil feed line fits perfect if you are using an hks cast manifold, i don't know about other brands or tubular style manifolds. if you use the fittings that i did, you won't need to drill anything. if you do decide to drill it's best if you use a drill press to keep the hole straight. i was also confused about restrictor sizes and listened to zero R about his recommendations and i have not needed one.

 

give me a day or two and I will pull mine and measure it.

kenn

 

i first did mine without a restrictor, and just ordered one due to smoking issues ive had. I ordered the .065. anything between that and about .095 should work fine.

 

i have a to4e also i will measure mine here shortly and let you know. but for a non bb turbo there should be no restrictor. journal bearing turbo's use the high oil pressure to help seal all the seals in it.

 

I have a restrictor in my non BB Garrett T04S, but I've also got an FD oil pressure regulator.

 

Thanks for the responses so far. As I stated above, and as we can all see from the responses so far, this seems to be a widely disagreed upon subject. I am starting to lean toward drilling a .090 restrictor hole, but will still wait for some more posts with first hand info before finalizing that decision. I assume it would be worse to over-restrict oil flow rather than under-restrict it. The responses lead me to believe too much oil flow may cause the turbo to smoke. What would the symptoms of too small of a restrictor hole be (please don't say blown turbo)?

 

The turbo could seize up. But the rx7 has such high oil pressure that it should be fine if its between the sizes i listed. Too much oil can eventually cause premature oil seal failure. Most non bb turbos don't need a restrictor in other car applications because the oil pressure isn't as high. The rx7 will probably usually require one. I was in the same boat as you and first tried without one. I get alot of smoke on start up and long boost runs. So i ordered a restrictor.

 

Mine is a .085 and its what came with the turbo from HKS no smoking and no problems.

Kenn

 

Thanks guys. I will likely go with something in the .080 - .090 range