I'm going to be running a Garrett GT3078R and was wondering how I can keep the oil pressure to the turbo bearings pretty consistent. This turbo like all/most BB turbos requires a minimum of 29psi at the top and an open drain at the bottom. I know many people just run an inline restrictor but I would imagine the pressure would drop below the required pressure of the turbo at idle. I dont know if this is OK, and it might be the case where it is since the turbo isn't doing any work there anyway. I've seen and heard of a few people using inline needle valves instead of a restrictor to get the pressure a little more accurate but still would have the same problems since its still a static pressure drop based on flowrate when at idle will be lower than at higher RPMs. That said, I contacted AEM about the use of their universal adjustable fuel pressure regulator and they said it would work since they have larger diaphragms you could pop in there to get the orifice large enough to pass oil and as long as you have a constant viscosity oil in your motor ie: SAE 30 instead of SAE 10-30 or other dynamic viscosity oils.
What are your thoughts....I might be horribly over-analyzing the problem or inventing a problem that does really exist if the turbo doesn't need that pressure when not in spool. I'm leaning towards the second option since there is a total lack of after-market parts for such a task.
The only "safe" way to do it is to use a pump on the turbo feed line. If you put an FPR there, you will create back pressure in the entire oiling system. Most remote turbo setups use these additional oil pumps to get oil to/from the turbo.
4cyltuner.com - Information Source For 4 Cylinder Tuners
Buy stuff from CarCustoms Ebay! Won't be disappointed!
I'll look into the pumps but I wouldn't think it would ack any different as far as backpressure in the oiling system than if you had an in-line restrictor. Is there any good links you got to a manufacturer of a oil pump and do any of them have adjustible pressure regulators in the pump?
^That is exactly what I already own and dont want to use unless it is my last resort. I'm more interested in a pressure regulated external oil pump i guess. If anybody has any specs or a manufacturer name/website to look at it would be greatly appreciated. Otherwise I'll be googling away.
29psi to the turbo?!?!?!?! Flat out.....no.
At most, a Garrett GT series BB turbo only requires 1-2psi of oil pressure.
Why do you need a pressure regulated pump for such a simple requirement?
Just use the restrictor you already have from ATP. It will work without problems. If need be, call Garrett directly to verify what I've explained here.
I will NEVER change my sig. HTML 4 EVA!!
<a href="http://www.j-body.org/members/mrpute"><img src="http://www.j-bom.com/images/sigs/putesig.jpg">
I usually offer good advice with facts and some experience to back it up. If people don't want it... oh well.
HP Tuners | Garrett T3/T04B | 2.5" Charge Pipes | 2.5" Downpipe | 650 Injectors | HO Manifold | Addco front/rear | Motor Mounts | HKS SSQV | Spec stage 3 | AEM UEGO Wideband | Team Green LSD | FMIC | 2.3 cams | 2.3 oil pump swap | 280WHP | Now ECOTECED
just use a restrictor fitting.
------------------------------------------------------------
ge_forcez22 wrote:I usually offer good advice with facts and some experience to back it up. If people don't want it... oh well.
I believe he was agreeing with you, and disagreeing with others. When I ordered my GT3071R, they said the inlet restrictor I had for my at one time t3/t4 setup would work fine. The idea is to not let that much pressure in the turbo, not to keep that much there. I was told 30psi max....otherwise your going to blow up a seal. I will contact APT to double check though.
What oil pressure is your car putting out at idle?
oh yah, sorry, I was talking about the thread starter. If people don't like tried and tested and PROVEN methods and want to spend more money on such a simple thing. They can go right ahead.
I have read that turbos prefer to have a 45 or 90 degree right after the restrictor so the oil doesn't aerate in the housing.. but I have never used one.
HP Tuners | Garrett T3/T04B | 2.5" Charge Pipes | 2.5" Downpipe | 650 Injectors | HO Manifold | Addco front/rear | Motor Mounts | HKS SSQV | Spec stage 3 | AEM UEGO Wideband | Team Green LSD | FMIC | 2.3 cams | 2.3 oil pump swap | 280WHP | Now ECOTECED
Well I did look at ATP's sight and they do have an unrestricted fitting fr use with the smaller GT BB turbos. I have sent them an email to see what they say.....i am anxious to hear, since I have my GT3071R thats ready to go in once my motor is done.
I know for your standard journal bearing T3/T4's and such, the inlet restrictor is the way to go.....perhaps not with the GT BB though......well see.
from the site:
"Oil inlet restrictor for all T3, T3/T4, T04, T72 etc. turbos (also larger ball bearing turbos such as GT4088R, GT4094R, GT4294R, GT4202R). "
HP Tuners | Garrett T3/T04B | 2.5" Charge Pipes | 2.5" Downpipe | 650 Injectors | HO Manifold | Addco front/rear | Motor Mounts | HKS SSQV | Spec stage 3 | AEM UEGO Wideband | Team Green LSD | FMIC | 2.3 cams | 2.3 oil pump swap | 280WHP | Now ECOTECED
ge_forcez22 wrote:from the site:
"Oil inlet restrictor for all T3, T3/T4, T04, T72 etc. turbos (also larger ball bearing turbos such as GT4088R, GT4094R, GT4294R, GT4202R). "
Agreed, I saw that too, but the turbo in question (GT3078R) and mine (GT3071R) are considered small frame ball bearing turbos. I dont know why they would be different, but perhaps they are. If they are then crap, I have to buy a new feed line. We will have to see what ATP says, but heres something else I found off their sire relating to oil:
Reduced Oil Flow - The ball bearing design reduces the required amount of oil to provide adequate lubrication. This lower oil volume reduces the chance for seal leakage. Also, the ball bearing is more tolerant of marginal lube conditions, and diminishes the possibility of turbocharger failure on engine shut down.
And this is what I was talking about earlier, as far as a non restricted oil feed.:
http://www.atpturbo.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=ATP-FTG-029&Category_Code=ATP-OIL2
I think the best thing is to wait until they get back to me with an answer.
ok, here is the info APT gave me:
"Use the unretricted fitting unless you have a compelling reason to use the
restricted fitting in order to avoid starving the turbo."
So aparently, the smaller GTBB Turbos do need more oil....as far as keeping a minimum pressure, I would not worry about it to much at idle, since your car should be putting more than enough out for a turbo under no stress. Perhaps doing something like an oil pump upgrade in the motor would be a good thing to do.....I dont see running a pressure regulator though.
Mr. Pute wrote:29psi to the turbo?!?!?!?! Flat out.....no.
At most, a Garrett GT series BB turbo only requires 1-2psi of oil pressure.
I've already talked to ATP about the oil pressure subject, asking what they would use to dynamically regulate the pressure and YES...29psi minimum to their dual BB turbos.
ge_forcez22 wrote:I usually offer good advice with facts and some experience to back it up. If people don't want it... oh well.
- you must have not read my entire first post since I already mentioned the pros and cons of your "advice" in there and why I didn't want to run a restrictor.
