Questions for Justin...

[BoostedBeaver]

So just to clear that up for my stupidity that would be number 1 correct.

 

[JusMX141]

Correct. I'm not too familiar with the '90 filter housings, but like I said I've always used the upper port...and I can tell by the way the housing is cast in your example that the upper port also leads straight to the pressure relief valve and then on to the rest of the engine.

 

[Bud92gsx]

Hey Justin.I was looking at the garrett website last night and thought of this question..What the hell is a free floating turbine? Does that just mean it's non wastegated?

 

[97gst_spyder]

Justin, do you happen to have any of those compressor covers or know where to get one? Also who would cut it to fit a 16g?

 

[JusMX141]

Hey Justin.I was looking at the garrett website last night and thought of this question..What the hell is a free floating turbine? Does that just mean it's non wastegated?

Free-Float
A free-floating turbocharger has no Wastegates device. This turbocharger can't control its own boost levels. For performance applications, the user normally must install an external Wastegates.

Justin, do you happen to have any of those compressor covers or know where to get one? Also who would cut it to fit a 16g?

Nope, and G-Pop Shop.

 

[Bud92gsx]

Thanks Justin

 

[cisco5311]

http://www.dsmtuners.com/forums/art...1680-china-ebay-7cm-td05-turbine-housing.html
http://www.dsmtuners.com/forums/tur...-ebay-replacement-turbine-housing-issues.htmlQUOTE]

Thank you sir, you have been a great help!

 

[JusMX141]

Don't take this as me bitching, but let's attempt to keep this thread free from General Tech questions that you may be too lazy to search for and keep them geared toward the hard stuff that you can't find just anywhere. I found answers for questions like the "Free Float" question and the one regarding the eBay turbine housings by searching about three seconds on this site and Google, respectively.

Just bringing back what Brian said earlier:

I hope this doesn't turn into a "I'm too lazy to search so I'll just post here" thread. Justin, please let me know if this starts heading that way.

Also, keep in mind we already have a "What turbo is this?" thread, so please use that for all your turbo ID questions - posting after searching, obviously

From this point on if an easily-searchable question gets asked, I'll probably just delete it. Remember, turbo identification questions should belong in the "Turbo I.D." merged thread so the topic is searchable. Of course if you have a random question about a certain type of turbo and don't necessarily feel like starting a new thread to get your answer, it's welcome here!

I appreciate all the questions so far- most of you guys are making my brain work overtime!

 

[TJCTalon]

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Happen to know what fitting is on the compressor cover?? Like what size

 

[JusMX141]

1/4" hose; it probably has 1/8" NPT threads, so you can swap it with whatever you want or cap it off if you already have a boost source in your lower intercooler pipe.

 

[Kyle_T]

Is it worth it to port the compressor outlet on a 14b to match the size of my j-pipe?

like this:

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[JusMX141]

Honestly I don't know if you'd feel a seat-of-the-pants difference, but it's always good to have a smooth transition of all connections in the intercooler piping system....and I've always felt the compressor outlet and OEM j-pipe were horribly undersized on these turbos.

 

[Kyle_T]

Honestly I don't know if you'd feel a seat-of-the-pants difference, but it's always good to have a smooth transition of all connections in the intercooler piping system....and I've always felt the compressor outlet and OEM j-pipe were horribly undersized on these turbos.

Yea, I'm trying to make the most out of my 14b so I went ahead and matched it to my j-pipe.


One last question. I was doing a little researching and found a couple of threads on the td05 SS 7cm gaskets cracking and warping and possible going through the turbine. I know you deal with alot of turbos and was wondering if you ever came across this before with the ss gaskets?

 

[JusMX141]

I've seen them crack before, but I've yet to see one completely break into pieces....however there are examples of such.

The reason I'd never use one is because there is no "gasket" about them- they're just a thick cut of stainless. They don't compress, they don't seal anything unless you spray them with copper spray. The OEM multi-layer gaskets are the way to go, hands-down.

 

[Kyle_T]

Ah, alright. Thanks alot

 

[perks563]

My turn -

I am getting ready to install my Evo III 16g set up and want to know where to source the oil feed from, the head or oil filter housing? I have researched this but am still unclear. Also, what oil pressure should I be reading for idle and WOT with and without balance shafts?

Thanks Justin for all of your time and effort into this very helpful thread!

 

[JusMX141]

All MHI turbos are designed to be fed from a low-pressure source, preferring a maximum operating pressure of 42-48psi.

Feeding from the filter housing unrestricted would be fatal...perhaps not immediately, but eventually. You're putting more stress on the turbo's internals than it's designed to see. Restricting the filter housing source can be enough to keep the turbo alive, but too much restriction to reach the appropriate pressure will deprive the cartridge of an operating volume. It's a delicate balance.

 

[perks563]

Ok, so I'll keep it fed from the head.

The reason I asked about the oil pressure is because at WOT I read 100psi (gauge is pegged). My gauge is referencing the oil filter housing. Should it be that high?

 

[JusMX141]

I don't think it should ever exceed 75-80psi, but that's up to you. Some people think more oil pressure is better- there are engine builders around me that have seen the oil burn and vaporize when injected into a tight tolerance at high pressure instead of lubricating like it should.

Many of the local V8 drag engine builders I know shoot for around 60-65psi when they cross the traps at top speed....of course they don't have overhead cams like we do.

 

[perks563]

The car is mostly stock right now, 3" turbo back and upped the boost to about 13-14 psi so I am worried that it is high.

I'll figure it out before I put all my new toys in. Thanks for the info Justin!

 

[DSMunknown]

Looking for your thoughts on ceramic coating on high temp exhaust parts (i.e. crack potential, stress on the CHRA components, etc).


FFWD Connection - Race Components That Will Freeze Your Brain

 

[95AWD6Bolt]

what size banjo bolt does an hx35 take for the oil feed?

I think its 12mmx1.25 but want to be sure.

 

[JusMX141]

Looking for your thoughts on ceramic coating on high temp exhaust parts (i.e. crack potential, stress on the CHRA components, etc).


FFWD Connection - Race Components That Will Freeze Your Brain

I can't see how it would be bad- plenty of guys do it. Paul had the entire manifold / turbine housing(s) setup coated on his compound twins. Looked great!

what size banjo bolt does an hx35 take for the oil feed?

I think its 12mmx1.25 but want to be sure.

12mm x 1.5.

That was quite a lazy attempt to get the right answer- this question has been discussed at least once in every Holset-titled thread on this site.

 

[95AWD6Bolt]

12mm x 1.5.

That was quite a lazy attempt to get the right answer- this question has been discussed at least once in every Holset-titled thread on this site.

Yea, my bad. I only did a quick skim of a few pages. I usually search away before asking but got lazy. Thanks for the answer though!

 

[Kevin Jewer]

The flow limit for a TD05H turbine in a 7cm housing is around 42-44 lb/min, so any compressor larger than that would be a waste. There are guys claiming 47 lb/min out of the 68HTA, but I honestly don't see how that's possible.

I can confirm the ~43 lb/min limit on the untouched TD05H 20g as it comes from FP put into a standard 7cm housing from my GF's car, even with an 18 psi actuator I mounted to it. It ran 11.7 like that but airflow just won't go any higher.

The 47 lbs/min from the same turbine on the 68HTA would probably be due to the higher efficiency of the HTA wheel. Increased compressor efficiency will allow more of the exhaust to be wastegated around the turbine at the same airflow. That being said, I've never run or tuned one.