Will NOT boost past 4.5 PSI. WHY?
#27
Honda-Tech Member
Re: Will NOT boost past 4.5 PSI. WHY?
No. No. bro, simply NO. Restrictors that size are for ALL turbos.
journal bearing turbos require a 0.040"-0.060" (1.0mm-1.5mm) restrictor.
ball bearing turbos require a 0.035"-0.040" (0.9mm-1.0mm) restrictor.
By drilling out the restrictor to the size of the hose/fitting, you just fucked yourself and any turbo you use it on.
If it's a 4an line, which most ebay kits are, thats a 0.170" hole, and 3an is 0.120" hole. THATS MORE THAN FOUR TIMES LARGER than what is REQUIRED
#28
Premium Member
Re: Will NOT boost past 4.5 PSI. WHY?
I don't know what I'm talking about? haha...that is quite amusing. I've been wrenching on Hondas when you were still in high school getting all excited about going to watch Fast & Furious, the first one.
Just remind us how well your shitty turbos are in the next 6 months, if that long. I guess you didn't respond to my comment about working on your own cars. Hope the shop you're using doesn't charge you too much. Too bad you can't buy knowledge or skills, two of which you seem to lack.
Just remind us how well your shitty turbos are in the next 6 months, if that long. I guess you didn't respond to my comment about working on your own cars. Hope the shop you're using doesn't charge you too much. Too bad you can't buy knowledge or skills, two of which you seem to lack.
#29
-Intl Steve Krew
Re: Will NOT boost past 4.5 PSI. WHY?
I love the internet, where you can write an essay about how you don't need to justify yourself to an opinionated manchild, trying to get the last word in .
How about if you aren't going to help OP, y'all can stop sidetracking his thread.
How about if you aren't going to help OP, y'all can stop sidetracking his thread.
#30
Re: Will NOT boost past 4.5 PSI. WHY?
well.... I would have to do an oil pressure test to really see what the oil pressure is. Where do you guys get the oil restrictor specs? Please show me. I’m here to learn.
#31
Honda-Tech Member
Re: Will NOT boost past 4.5 PSI. WHY?
Directly from the manufacturers. I speak with the reps of all the major manufacturers fairly frequently. Also through the course of several decades of experience and knowing what works and what doesn't. Learning things the hard way is still learning things.
Just to clarify, the proper spec for oil delivery to the turbo IS according to PSI, and that oil pressure spec is usually the PEAK oil pressure that the turbo sees at any given time. But it's next to impossible to supply a constant oil pressure to a turbo when using the engine as the oil delivery device because engine oil pressure varies according to engine rpm. The sizes I provided above are the sizes proven to supply the correct peak oil pressure while at operating speeds. At low rpm, turbos do not need the full oil pressure supply, because they are spinning at very low rpm's with near zero load on them. Similar to how a stock or built honda engine is fine idling at 15-20psi of oil pressure but needs 60psi+ at higher rpm and higher load.
Sidenote: I give you credit for being humble about this, and being willing to learn and wanting to learn. That is all too often a rare character trait to have as a honda owner
#32
Honda-Tech Member
Re: Will NOT boost past 4.5 PSI. WHY?
.060" restrictor for journal bearing, .035" restrictor for ball bearing. This is common knowledge.
No restrictor and you'll likely blow out the seals on the turbo, especially quickly on an ebay one.
It is wise to run an oil pressure gauge, and tee it off of the feed source to the turbo so you know how much oil you are throwing at it.
No restrictor and you'll likely blow out the seals on the turbo, especially quickly on an ebay one.
It is wise to run an oil pressure gauge, and tee it off of the feed source to the turbo so you know how much oil you are throwing at it.
#33
Re: Will NOT boost past 4.5 PSI. WHY?
Directly from the manufacturers. I speak with the reps of all the major manufacturers fairly frequently. Also through the course of several decades of experience and knowing what works and what doesn't. Learning things the hard way is still learning things.
Just to clarify, the proper spec for oil delivery to the turbo IS according to PSI, and that oil pressure spec is usually the PEAK oil pressure that the turbo sees at any given time. But it's next to impossible to supply a constant oil pressure to a turbo when using the engine as the oil delivery device because engine oil pressure varies according to engine rpm. The sizes I provided above are the sizes proven to supply the correct peak oil pressure while at operating speeds. At low rpm, turbos do not need the full oil pressure supply, because they are spinning at very low rpm's with near zero load on them. Similar to how a stock or built honda engine is fine idling at 15-20psi of oil pressure but needs 60psi+ at higher rpm and higher load.
Sidenote: I give you credit for being humble about this, and being willing to learn and wanting to learn. That is all too often a rare character trait to have as a honda owner
ill run a T at the turbo feed line and run a oil gauge. Also I will get a another restrictor and test the oil pressure there but I will have to find a way to do it with out starving oil to the turbo.
May have to run another feed line to the turbo or just take the turbo out and drive in a NA set up.... I don’t know I’ll think of something.
Thank you you guys.
Im a VW/Audi tech and I don’t ever mess around with turbo restrictors because I always replace stock with stock and I don’t have to worry about these things. We don’t do any tuning here, just service and diagnosis.
#34
Honda-Tech Member
Re: Will NOT boost past 4.5 PSI. WHY?
If you install a gauge to see what oil pressure is going to the turbo, the gauge has to be between the restrictor and the turbo. Which means stacking fittings. And those fittings WILL break. So don't drive the car with it installed. Just get the oil fully warmed up by driving the car for a bit, then install the gauge setup, and IN NEUTRAL rev the engine to redline while watching the gauge. You do not want to see it go any higher than 50psi. 45psi max is ideal. Once you verify pressure, remove all the fittings and the gauge and attach the line and restrictor directly to the turbo again before driving the car at all
If you install the gauge in the feed line before the restrictor, it will just tell you an inaccurate reading of engine oil pressure. Inaccurate because the hose itself will alter the pressure, and the restrictor further downstream will alter the pressure.
Or, you can just get a 0.045"-0.060" restrictor, install it, and be done. 0.060" is most common.
If you install the gauge in the feed line before the restrictor, it will just tell you an inaccurate reading of engine oil pressure. Inaccurate because the hose itself will alter the pressure, and the restrictor further downstream will alter the pressure.
Or, you can just get a 0.045"-0.060" restrictor, install it, and be done. 0.060" is most common.
#35
Honda-Tech Member
Re: Will NOT boost past 4.5 PSI. WHY?
I've always ran bb sized oil restrictors on eBay turbos. Out of about 80 I've installed I had two fail prematurely, one was from a metal piece clogging the restrictor from the feed line. The other one was just luck of the draw.
id rather buy 3 eBay 35r's and still have a thousand bucks in my pocket then buy one new garret unit. I've seen Garrett's, precision, borg warners and most other turbo's fail. I think the best track record I've seen so far has been holsets.
id rather buy 3 eBay 35r's and still have a thousand bucks in my pocket then buy one new garret unit. I've seen Garrett's, precision, borg warners and most other turbo's fail. I think the best track record I've seen so far has been holsets.
#36
Re: Will NOT boost past 4.5 PSI. WHY?
I've always ran bb sized oil restrictors on eBay turbos. Out of about 80 I've installed I had two fail prematurely, one was from a metal piece clogging the restrictor from the feed line. The other one was just luck of the draw.
id rather buy 3 eBay 35r's and still have a thousand bucks in my pocket then buy one new garret unit. I've seen Garrett's, precision, borg warners and most other turbo's fail. I think the best track record I've seen so far has been holsets.
id rather buy 3 eBay 35r's and still have a thousand bucks in my pocket then buy one new garret unit. I've seen Garrett's, precision, borg warners and most other turbo's fail. I think the best track record I've seen so far has been holsets.
#37
Moderator
iTrader: (14)
Re: Will NOT boost past 4.5 PSI. WHY?
I've always ran bb sized oil restrictors on eBay turbos. Out of about 80 I've installed I had two fail prematurely, one was from a metal piece clogging the restrictor from the feed line. The other one was just luck of the draw.
id rather buy 3 eBay 35r's and still have a thousand bucks in my pocket then buy one new garret unit. I've seen Garrett's, precision, borg warners and most other turbo's fail. I think the best track record I've seen so far has been holsets.
id rather buy 3 eBay 35r's and still have a thousand bucks in my pocket then buy one new garret unit. I've seen Garrett's, precision, borg warners and most other turbo's fail. I think the best track record I've seen so far has been holsets.
The only reason holsets last long is because it has a lot of give in their engineering to allow a lot of user install mistake to occur before they die. But I do give credit that they areveryrobust. I converted a Holset die-hard to a Garrett fan-boy in one application (4G63 700whp "street car".) by showing him the proper way to install the equipment. 50,000 miles later, He'll never go with anything else again.
Last edited by TheShodan; 07-18-2019 at 05:29 PM.
#38
Honda-Tech Member
Re: Will NOT boost past 4.5 PSI. WHY?
And for those that like to wrench & replace a lot , that's fine . The main reason these others have failed were due 99% of the time due to user error or a case in which the thrust bearing shifted due to a sudden change in pressurization on a dyno. IT never dies immediately, but it does soon , there after.
The only reason holsets last long is because it has a lot of give in their engineering to allow a lot of user install mistake to occur before they die. But I do give credit that they areveryrobust. I converted a Holset die-hard to a Garrett fan-boy in one application (4G63 700whp "street car".) by showing him the proper way to install the equipment. 50,000 miles later, He'll never go with anything else again.
The only reason holsets last long is because it has a lot of give in their engineering to allow a lot of user install mistake to occur before they die. But I do give credit that they areveryrobust. I converted a Holset die-hard to a Garrett fan-boy in one application (4G63 700whp "street car".) by showing him the proper way to install the equipment. 50,000 miles later, He'll never go with anything else again.
#39
Honda-Tech Member
Re: Will NOT boost past 4.5 PSI. WHY?
Garrett makes incredible turbos. I know I personally have put them through absolute hell and they've taken the abuse with ease. I had a t25 JB with unknown miles, which went through blowing an engine and getting metal shavings in the bearings but continued to run for quite a while. Finally replaced the bearings, cleaned it out, regulated the oil flow properly and ran it another 50,000 miles before removing it from the car so I could sell it.
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