BB turbo question

[Muggus]

I know alot of people say that its best to run the oil feed from the oil filter housing because it has the best pressure. It that the case for BB turbo's also? Isnt the pressure suppost to be restricted a little for some reason? I was just wondering because mine came with an SS line which feeds from the head.

[Muggus]

I read this off of the FP site and it kind of confsued me. My turbo already has the filter and it also feeds from the head. Half way through it says that the restrictor needs to be drilled out and then the next sentence says that it doesnt need the restrictor at all.

"When using the FP4ANFilter on an oil supply line that originates at the filter housing on the 4G63 engine, the .8mm restrictor results in the Garrett recommened pressure at the turbocharger oil inlet. For 4G63 engines that feed the turbo oil off the cylinder head, the .8mm restrictor should be drilled out to .125”. The normal 4G63 engine has low enough oil pressure at the head oil supply port that the .8mm orifice is not required. The filter element provides all the restriction needed to get the oil inlet pressure down to the Garrett recommended values.

Oil supply off the filter housing - use the .8mm restrictor as supplied.

Oil supply off the cylinder head - drill the restrictor out to .125” "

[LilBeanTSI]

BB turbos are supposed to have a constant supply of oil, something around 30 psi i believe. Too much oil actually impedes their operation. Most bb turbo oil feed lines are fed from the head and have a restrictor put in them to limit the amount of oil flow. A feed line off the filter housing would supply too much oil pressure.

*Edit*
You beat me to it lol. I would not drill out the restrictor unless you are using FP's oil feed line, and if you are you only drill it out if you are going to run the oil feed from the head.

[Muggus]

The turbo is from FP and so is the filter so im assuming the line is also. I just was confused because the FP site says to drill it out if running it from the head, but then is says right after it that the head is low enough pressure where the filter alone is fine. Im gonna have to ask the person i bought the turbo from, i hope he wasnt running the turbo with the .8mm restrictor from the head and starved the turbo.

[Super16g]

When I got my 3065 from FP it came with a SS Feed line to the head and a banjo bolt that they made. The hole in the bolt is smaller to restrict the oil coming out of the head. But when I ordered their inline filter a few months later I was told to use the stock banjo bolt as the filter will create enough of a restriction. Atleast this is my understanding.

[Muggus]

Oh alright, ill just have to give them a call. The person i bought it from said there was a banjo bolt in there to use with it also but there also a filter so well see. Thanks So how do you like the turbo, i cant wait to get the motor back together and install it.

[Super16g]

I love it. Put down 437whp on pump gas at like 23psi or so. First time at the track I did 11.72 @119 on pump gas in a full weight 2gen. But I also was shifting slow and only got a 1.85 60'. Mods are ross/eagle 6 bolt, SBR Stage V Head, 272, Magnus SM Intake, AEM.......

[gtluke]

the oil filter housing is the cleanest oil, the turbo doesn't need the high pressure. i don't have a BB turbo but i run a nitrous fuel jet in my feed line to cut down on the oil supply, as it tends to overfill the turbo and smoke.

[Muggus]

Nice, im gonna throw a set of fp2 cams in and my dejon intake manifold. Full built trans is going it same time. Hopeing for around a 11.9 first time out with it, but im expecting around 12.3 with shit tune. Final goal is about 10.8 on race gas and maybe nitrous but hopefully not.

[BigT]

Damn this is so complicated. So if you have an inline filter you dont need a restrictor off the head. But, i thought regardless you wouldnt need a restrictor off the head? I'll make sure to tell Nate to give me what i need stuff when i pick up a GT30R. I'll just have to take his word for it. :lol:

[Super16g]

FP has their own filter so it has a built in restrictor. I run the Stock Banjo bolt with FPs new inline filter and it works great.

[Bean]

BB turbo's don't need the same amount of oil that a standard turbo needs. Its best to feed them off the head and you should use a filter in line. They will smoke if the pressure is too high. I would use the stock banjo fitting and the filter. Usually the filter provides enough restriction. ATP Turbo makes a fitting for the GTBB turbos that steps it down to .035 if you run into a problem.


http://www.atpturbo.com/Merchant2/merch ... _Code=GTBB (http://www.atpturbo.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=ATP-OIL-021&Category_Code=GTBB)

[Muggus]

Ok thanks. I talked to the previos owner and he said that the restrictor was drilled out already according to the FP site. I also remember him giving me a banjo bolt and saying something about it. Im gonna have to compare it with a stock one and see if its a smaller opening. Ill give FP a call tomorow and see what they suggest.

[Muggus]

Well i just got off the phone with someone from FP. He told me on a close to stock motor with balance shafts that its ok to run it without a restrictor from the head, but once the balance shafts are removed the oil pressure at the head increases alot and the restrictor should still be there.

[blcknspo0ln]

I believe from the oil filter housing with no balance shafts.. the oil pressure will be in excess of 100 psi