So like the topic asks... Does anyone think a -3AN feed line for the turbo is too small? Please give reason as to why you think it might be too small as well. I am having a bunch of problems with a smoking turbo. My seals are pretty much shot on the turbo which is causing this. But the turbo is brand new, well about 6000 miles on it. But still, it shouldn't be bad yet. Anyhow, there is a ton of shaft play and the bearing is certaintly damaged.
Any advice?
Oh, I have a -12AN drain line. THe i.d. on the 1/2" drain fittings is 7/16" if you guys are curious about that. And the drain is a straight as possible, although not perfectly straight.
Thanks!
Built block. Refinished head. Tuned suspension. TURBO.
#101631, "RE: -3AN feed line too small?" In response to Reply # 0 Oct-11-07 07:05 AM by totaleclipse_05
What type and brand of turbo do you have? Some requre oil pressure to be around 30-40 psi going into the turbo and our cars usually run about 60-70 psi when fully warmed up. Only thing I can think of is to use an oil restrictor on the oil feed. I am using one of those and a -4 AN oil feed line and am having no problems.
You will probably have to get your turbo rebuilt or buy a new one if there is substantial shaft-play and the oil seals are gone.
And -12 AN oil drain? -10 is what the average people go with.
Mike D -------------------------------------------------------------------------------------------------
Originally posted by DR1665 You're welcome to all the beer you can drink, but you have to go get it yourself. Don't get pissy when we point to the fridge and tell you to get it yourself.
#101632, "RE: -3AN feed line too small?" In response to Reply # 1
-3 is fine.
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'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#101638, "RE: -3AN feed line too small?" In response to Reply # 3
Originally posted by bzoss Thanks for the feedback. When you say you used an oil restrictor... what size (approximately) was the hole? Do you guys think that a 7/16" drain is large enough as well?
ATP sells .065" oil restrictors for T3 CHRAs. Most returns i've seen are 1/2" or so. I use -10 myself and have never had any problem.
______________________________ If a sentence found online has 35% misspellings or greater and includes at least two racially charged expletives, chances are it is a YouTube comment.
'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#101642, "RE: -3AN feed line too small?" In response to Reply # 4
Is it possible that this restrictor is too much? I have a T3 with the 360 degree thrust bearing. Recently I put a .030" nitrous jet in line with the supply to act as a restrictor because I thought that I was 'overpressurizing' my turbo with oil causing oil to spew past the seals. I believe that this ultimately is what wiped my turbo's seals and bearing.
Basically the T3's are already restriced on the inside of the cartridge/bearing housing, and I am not sure that it is a good idea to ristrict the oil at all before this.
Any further thoughts?
Built block. Refinished head. Tuned suspension. TURBO.
#101643, "RE: -3AN feed line too small?" In response to Reply # 5
I think your restrictor is a little too small. Per the following source, it appears as though 0.078" or around that is a good restrictor size for Garrett turbos that require it:
Many people get away with just drilling out an oil inlet flange to their desired specifications. While over-lubrication can be a serious problem, for standard journal bearing turbos, under-lubrications seems much more harmful.
Ball bearing turbos are the ones you'd want to use such a small restrictor for...
