Short term effects of larger oil restrictor???

[jspaeth]

I have a brand new GT2871R.....due to extenuating circumstances, might be forced to use the stock oil line for a short period of times (maybe a few days or a week or 2).

I know that you are sposed to use a 0.03" restrictor on GT BB turbos. I have it, but the line I am using needs to be replaced, so I can;t use the restrictor for now

Does anyone know if using the stock banjo line (with it's 0.08" builtin restrictor) for a short time period will cause any damage?

thanks

[Dousan_PG]

dont do it
dont do it

might be ok but u want to take that risk????
keep ur stock turbo for now.

[Def]

Stock restrictor is about 0.060" ID. You should be fine with this on a GT2871R - and in fact, starting about a year or so ago all Garrett GT series turbos have a restrictor built into the CHRA oil inlet(looking at it should tell you if it has this or not).

I've done extensive instrumented testing of liquid/oil cooling systems on fighter jets, and on an orifice size or about 0.060" you won't exceed the Garrett spec'd maximum of 20-25 psi of oil pressure in the CHRA.

0.035-0.040" gets the pressure down even lower, but it's not necessary as long as the seals are holding IMO.

You should be fine.. especially if this is just a temporary fix.

[jspaeth]

Dousan, I would love to, but everything is already on the car, my tuning appointment is made for Monday, and I am semi-SOL


Def:

Yeah this is a temp fix....my oil pressure maxes out around 75-80......should I be okay on the dyno getting tuned? By temporary, I mean maybe 500 miles at most, until I can get that line replaced.

Will pulling to redline under boost make the problem worse?


thx

[Slidin240Wayz]

You need an oil line. Will the one from a t28 work?

I have Taka Lines.

If so...call me.

Carlos

[jackal264]

how big is the restrictor on the taka lines? i thought the fitting provided was much to big?

also can you put a restrictor at the block or does it have to be at the turbo?

[jspaeth]

The Taka restrictor is a separate fitting that screws into the CHRA....the oil line then goes onto the restrictor fitting

I have the 0.03" fitting which is what you are sposed to use. The stock banjo bolt has a restriction that isn't quite this small.

[Def]

The restrictor drops the oil pressure down much below what your oil pressure is at the filter.

In case you're still nervous, the same CHRA bearing used in S14/S15 turbos uses the EXACT same restrictor bolt as the S13 SR. So Nissan apparently thought it was fine for the life of the car, and so do I. :D

[jspaeth]

Ok....and it's cool for them floor it on the dyno right?

If you're wrong, please send me a check for $1100.....

Just playing thanks for the help man

[zoototheyork]

i havent run a restrictor for a few months at 17-22 psi daily nothing broke.
go for it pussy

[jspaeth]

Yeah I am pussy because I want to take care of my brand new $1100 turbo.


I hope your seals go

Just because nothing "broke" doesn't mean you aren't causing long term damage.

you are a genius

[zoototheyork]

200 more days under warrenty

[fliprayzin240sx]

200 more days under warrenty

And with your luck, itll take a shit on the 201st day...:fawkd:

[Ian]

If Garret tells you to do it, why wouldn't you just do what they say?

[Def]

Oil pressure is based on RPM - not throttle position.


If you're really that nervous about it, go to a local hydraulic supply/hose place and have them swage you up a -4/-3 AN/JIC line like what you've got that's leaking. Just bring yours in and they should be able to make you up one without much issue.

[KA-T_240]

^word.

My buddy has a gt28r on his S13 SR and is using the stock lines, no issues in 3 years.