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Will NOT boost past 4.5 PSI. WHY?

 
Old 03-03-2019, 03:19 PM
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Default Re: Will NOT boost past 4.5 PSI. WHY?

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Old 03-03-2019, 04:43 PM
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Default Re: Will NOT boost past 4.5 PSI. WHY?

Originally Posted by ngv1515 View Post
I noticed that the oil restrictor hole for the turbo was way too small for jornal bearing turbos. It had a 1mm restrictor. I drilled it to the size of oil feed hose.
^this^ was a HUGE mistake.

Originally Posted by NVturbo View Post
this makes me doubt your mechanical skills. SMH....

There is a reason why turbo companies install restrictors on the feed port
I agree with ^this guy^.

Originally Posted by ngv1515 View Post
restrictors that small are for ball bearing turbos.
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
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Old 03-03-2019, 08:58 PM
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Default Re: Will NOT boost past 4.5 PSI. WHY?

Originally Posted by NVturbo View Post
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.
That would be because I don't feel like I need to justify anything to some very angry, opinionated manchild on the internet. If it helps you, I do all my own work including welding/fabrication, tune my own cars and have done many, many others. I have my own shop and actually do this for a living, buddy. Which seems to be more than you've done considering how you can't even tune your own car according to your sig so I don't really feel like you have any room to go around making empty accusations about me. But I digress...You have not had any proper arguments to validate your very subjective opinion thus far, and I doubt you will be producing any given the "quality" of your previous responses. With that said, I'll leave you to continue spewing your BS as you see fit, just try not to get all upset in the future when someone else calls you out on it.
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Old 03-04-2019, 01:22 AM
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Default 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.

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Old 03-04-2019, 04:28 AM
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Default 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. Iím here to learn.


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Old 03-04-2019, 05:41 AM
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Default Re: Will NOT boost past 4.5 PSI. WHY?

Originally Posted by ngv1515 View Post
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.




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
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Old 03-04-2019, 06:00 AM
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Default 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.
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Old 03-04-2019, 09:48 AM
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Default Re: Will NOT boost past 4.5 PSI. WHY?

Originally Posted by motoxxxman View Post




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 donít know Iíll think of something.

Thank you you guys.

Im a VW/Audi tech and I donít ever mess around with turbo restrictors because I always replace stock with stock and I donít have to worry about these things. We donít do any tuning here, just service and diagnosis.
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Old 03-04-2019, 07:14 PM
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Default 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.
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Old 03-26-2019, 12:09 AM
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Default 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.
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Old 03-26-2019, 05:15 AM
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Default Re: Will NOT boost past 4.5 PSI. WHY?

Originally Posted by K7-1Ktrevor View Post
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.
What do you mean by "bb sized"?
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Old 03-26-2019, 10:07 AM
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Default Re: Will NOT boost past 4.5 PSI. WHY?

Originally Posted by K7-1Ktrevor View Post
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.
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.
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Old 03-26-2019, 12:07 PM
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Default Re: Will NOT boost past 4.5 PSI. WHY?

Originally Posted by TheShodan View Post
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.
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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Old 03-27-2019, 04:47 AM
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Default Re: Will NOT boost past 4.5 PSI. WHY?

Originally Posted by 2x0 View Post
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.
I can second that. The Garrett turbo on my car is from the early 80's, has over 500k miles, and still works excellently. I've rebuilt it three times, but the only parts I've ever replaced are the bearings, seals, and bolts. And a drop-in billet compressor wheel when I wanted more airflow.
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