7-blade hx-35 max boost 30 psi???

[black_gst]

Well, not exactly. If you test the system without the turbo and the problem persists, then you know it's not an issue with the turbo. If the problem goes away, well then you know the turbo is the problem.

exactly ^ alsoyou can cap off you pcv while testing because those somethimes go bad.

by removing one possible problem at a time you can rule each item out as being the cause of your problem...

so if you bypass the turbo and do a BLT and you have no problems then you KNOW there is a problem with the turbo

 

[black_gst]

True but by bypassing the turbo im also bypassing a known leak, and I dont know to what extent is normal.

a way to tell if its abnormal would be if your turbo smokes under boost or if theres alot of oil in you IC or ICP's.

one time my oil seal went out on the compressor side my turbo and it kept smoking under vaccum but not under boost. and i couldent figure out the problem... eventually the turbo went completly and i pumped a quart of oil into my IC.... and that wants fun!

also there wasnt any abnormal shaft play at 1st but when it went all the way it was really bad shaft play

 

[bwhite]

The car does smoke only after I boost. What could that mean.

 

[black_gst]

how much??? like one little puff? or a cloud?

 

[joyfil2001]

The car does smoke only after I boost. What could that mean.

It means your turbo is on its last leg. I had the same problem on my first turbo. It would only smoke after it boosted and I let off the gas.

 

[bwhite]

Sometimes a puff sometimes a cloud. If I boost through two or more gears its a puff or less. If I just do one gear its a small cloud.

 

[bwhite]

So I did more tests and found a few more leaks. I got it up to 35psi now. I counted seconds and it took 33 seconds to go from 25 psi to 3 psi. Is that normal pressure drop? P.S. Wife killed the battery on the camera.

 

[williillii]

My car smoked just like you described and was slightly slow to spool. It is a MHI 20g and I had it fed off the OFH with a -4an no restrictors....well I moved the feed line to the head and it stopped smoking and feels like it spools a bit better. Like 100rpm...nothing major.

This probably isnt your issue, but what is your oil feed/drain setup like?

 

[Strm Trpr]

Hook up the boost leak tester to the TB Elbow to pressurize the TB and the Intake Manifold to eliminate any boost leaks there.
Then work your way back to the turbo at each coupler.

Lastly you can BLT a HX35, you just need to cap off the turbo outlet and use a 4" BLT'r on the inlet, and this will tell you if you're compressor cover is leaking.

How are you feeding the turbo oil?

The turbo oil seal is going to leak when the engine is not providing oil pressure to the CHRA, so some pressure lost into the oil return line is normal, and this is where you're hearing the bubbling.

The smoking upon decel is a sign the turbo oil seal is on it's way out.

 

[bwhite]

Im feeding from the ofh -4an and a .78 nos jet, im using a -10an drain which im thinking is the problem with the smoking issue. I didnt realize how critical every little boost leak was when running high boost.

 

[dsm-onster]

Ah! making more sense now. Yes, if youve sealed the gate shut and couldn't go past 30psi, then you had a leak.

Keep in mind that this turbo is NOT rated at 65lb/min. Where did you get this? It may need to be corrected. The compressor map shows 57-58lb/min peak. And Holset/Cummins per there published literature rates it at 59lb/min choke. So dont be disappointed you 56mm compressor wont spit out 61mm (gt35r) flow at maximum .

Now I personally would check for abnormal shaft play, as it was pushed so hard: originally you couldnt get it to hold over 30psi and the original blt bled down so quickly. If your seals are shot, its a relatively easy fix. Mark the wheels and reverse nut.

-12an is the minimum drain reqirements, 19mm. Keep in mind the stock dsm oil pan drain hole has a significantly less diameter than 19mm, and the bolt holes are a bit too close for comfort to open it up that wide. This is why I opted for the n/t 4g63/g4cn/g4cs/etc drain pan. cut whatever size I want and use whatever connection I want.

Your oil feed pressure may still be too high with that large diameter restrictor and -4an lines. Its very easy to check oil pressure (neutral rev in the driveway). Just use your fuel pressure gauge. I preach this all the time: You do NOT know your turbo oil pressure is fine until you check. Your cousins brothers bodyguard and John Shepherd himself may have a feed setup that didnt blow their turbos, but I will guarantee you YOUR 4g63 will have 10-15psi difference in pressure with the same parts.

 

[Strm Trpr]

Im feeding from the ofh -4an and a .078 nos jet, im using a -10an drain which im thinking is the problem with the smoking issue. I didnt realize how critical every little boost leak was when running high boost.

Fixed that for you.

Are the balance shafts eliminated?
If so, did you port your Oil Filter Housing?

A -10AN hose is ~.560" ID and is barely enough oil drain line diameter even when restricted with a .078" restrictor.

People have used -10AN with success when feeding from the OFH, just make sure there are absolutely no kinks in the return line.

Holset recommends 19mm, or .750" minimum ID return line.

 

[jrohner]

I have a 7-blade HX35 on my car with the stock 12cm housing in an ebay T3 manifold and 22psi wastegate. I cannot even hold 30psi, but it is showing 50 lb/min. At around 5500rpms boost drops to 27. I even went to ECU controlled boost, and it didn't really help. This sucks as my 16G would hold more boost than this Holset does. I had an 8-blade in the bolton housing and it was about the same too, just spooled slightly quicker and flowed less. I do highly prefer the stock 12cm housing over the bolton; it fits nicer, and the spool is not that noticeable when driving (more so in logs).

Now I can't do anymore testing as it sounds like my transmission broke (again). I was showing 473awhp/430tq.

 

[bwhite]

Whoops. It 60 lb/min im sorry. And I have no BS and a FFWD forward faceing oil filter housing.

 

[Strm Trpr]

Whoops. It 60 lb/min im sorry. And I have no BS and a FFWD forward faceing oil filter housing.

Is your OFH ported like this?

 

[dsm-onster]

Howly massive typo batman!¡! Theres a big difference in 50lb/min and 60lb/min. You're at the edge of the map if the airflow is close to accurate. Remember, I said the 7blade is a 57-59lb/min compressor.

I have a 7-blade HX35 on my car with the stock 12cm housing in an ebay T3 manifold and 22psi wastegate. I cannot even hold 30psi, but it is showing 50 lb/min. At around 5500rpms boost drops to 27. I even went to ECU controlled boost, and it didn't really help. This sucks as my 16G would hold more boost than this Holset does. I had an 8-blade in the bolton housing and it was about the same too, just spooled slightly quicker and flowed less. I do highly prefer the stock 12cm housing over the bolton; it fits nicer, and the spool is not that noticeable when driving (more so in logs).

Now I can't do anymore testing as it sounds like my transmission broke (again). I was showing 473awhp/430tq.

You have a problem. My bolton and this guys 12cm hx35 here both hold 35psi, and he has a great flowing smim. And I'm running the 8blade compressor.

And I cant really believe that it 'sucks' that your 16g held more boost. After all what was it flowing ? 450+ whp is a *bit* out of the average 16g range.

 

[Strm Trpr]

I have a 7-blade HX35 on my car with the stock 12cm housing in an ebay T3 manifold and 22psi wastegate. I cannot even hold 30psi, but it is showing 50 lb/min. At around 5500rpms boost drops to 27. I even went to ECU controlled boost, and it didn't really help. This sucks as my 16G would hold more boost than this Holset does. I had an 8-blade in the bolton housing and it was about the same too, just spooled slightly quicker and flowed less. I do highly prefer the stock 12cm housing over the bolton; it fits nicer, and the spool is not that noticeable when driving (more so in logs).

Now I can't do anymore testing as it sounds like my transmission broke (again). I was showing 473awhp/430tq.

Hey dude, update your mod list please...
Nice numbers BTW.
Looking to get my Twin Scroll HX35 up and running before the end of the year.
Depends on how busy Jim at JMF is...

 

[-red97rum-]

My 8 blade hx35 holds 32psi just fine in the .55A/R bep housing. It spikes to 34 for a split second and then holds 32 psi all the way once the wastegate is open. I need a stronger spring in the wastegate before I can run more boost.. I have no idea what how many lbs/min it's flowing.

Is it possible it's not holdinhg more boost because the stock 12cm turbine side flows so much better up top? Just because you're not making more boost doesn't mean your not pumping a good amount of air through the thing. Well, on second thought, you should be able to hold more than 30psi with the 7 blade compressor wheel.

*edit: Just saw you were able to get it to hold 35psi. Did your log show more lbs/min with 35psi?

 

[bwhite]

I did one quick pull and didnt get a log, got pulled over in the driveway. 68-35. ####!!! Thats two tickets in two weeks, and I havent had one in 5 yrs. Oh and strm trpr I dont know its on the car and I didnt look before I put it on, I did it last winter.

 

[keltalon]

Did you ever find out what the problem was?

 

[bwhite]

The most I was able to get out of it was 37 psi. It was mainly my bov leaking, and few other very small leaks.

 

[Rideit636]

Are there any cracks around the wastegate flapper?

 

[bwhite]

No cracks anywhere. Like I said it was chalked up to be a few small boost leaks.