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

[bwhite]

I have fixed all major boost leaks, I have no pre-turbo exhaust leaks. I have pulled the wastegate hose off and straped the flapper door shut. This is in the orginal 12cm turbine housing. Im running a 3inch vband directly off the turbo, so there shouldnt be any exhaust restrictions. Link shows im only flowing 50 lb/min by 8k. What am I missing here? I thought that this turbo was supposed to put out insane amounts of boost. . At least more the 30 psi.

 

[bsbllfit7]

my guess is the housing is bottle necking you if you are using the bolt on bep housing like i think you are. Also since you are using internal gate my guess is that is the max it can flow because of the limited wastegate port. Someone else may chime in on this but through my research of these turbos that is what i have read.

 

[bwhite]

Im using the 12cm divided housing the turbo came with from factory as stated above.

 

[dsmmatt28]

Well first off..before we know anything your going to have to post up a log?? Link will tell us if your boost est and actual boost is off.. their are multiple things on your tune or your settings that can affect your lbs per min..and what your are actually reading also 30 psi 50lbs.. is about 500 hp give or take not bad.. if you ask me and also what is your timing at and your AFR's? See what I mean by to many variables.. give us more info so we can better help you and understand your situation..

 

[frosh29]

Hey Bwhite,

If you take a look at my profile, you will see that I am running an HX 7 blade as well. Its a great turbo in my opinion and has lived up the hype for me for sure.

I'm also running link... another good choice, but I digress. I see that you are using the original housing, so that's NOT the BEP which I am using.

I flow 63 lb/min at 6,800 RPMs with about 16 degrees of timing. I run 30 psi on my setup and I know that this turbo is not done yet. I can still get more out of it. I do not think that you are at max flow with that at 50 lb/min... They can definately hit 40 psi. HIghest I've been on my HX was 35 and it was building up "insane bost". Lit all 4 up off the line.

Have you run the link tuning docs to base tune your car? Are you 100% sure that all the base settings are correct? Do you run a wideband to tune off of?

If you are seeing that the turbo is not bosting past 30 PSI, even with the flapper manually shut, you may have another issue that you not seeing under smaller amounts of boost.

For example. I would run my car with this setup at 25 PSI and tune off of that. I would get decent numbers: 25 PSI at ~4,200 RPMs 18-20 deg timing with a perfect AFR. I would turn it up to 32PSI and found that I would spool the turbo and it would seem like it was working, but I would not really feel the power/boost. I was falling on its face later in theRPMs. I would also see my AFR get really lean up top and I was not sure why. Eventually I figured out that at the higher boost levels, my IC piping was not holding all of the air in/out and developed a leak, inviting umetered air into my system, causing the lean condition that I could not tune out.

Long story short, when you run that much boost, it really makes sense to boost leak test so you are sure that there are not boost leaks at 30-32 PSI..Funny things happen when you move that much air through those little pipes.

Figured out that I would chime in since I pretty much run that setup.

Please let me know if you need more information.

-Thanks,
Scott

 

[bwhite]

Maybe my values are off in link but I will post a log. I also forgot to mention Im running E85, AFR is not logged yet but I have it at 12.5-12.8 and 19-20 advance at redline. Im trying to get you a log for some reason it wont load. Ill try again later maybe the sites acting funny.

 

[richard33]

I've gotten 40lbs out of my 8 blade hx35 on the stock backhousing, stock intake manifold and throttle body.

 

[turbotalon1g]

Sounds good to me, turn it up if you want more PSI. I ran 37psi on mine.

 

[techghost]

i was putting down 44lbs at 26/26psi on my holset HX35 billet wheel 7 blade on its stock 12cm2 housing.

I think you have a limitation somewhere e.g. fuel/TB etc or a leak which is preventing your turbo to build more then 30psi. whats your setup? what injectors do you have? post up a log and that will tell us more about it.

@frosh
would you be able to share a log as well? i would love to see one. i think i might be able to reach 50lbs at 30psi as well but i initially thought hx35 should make more on 30psi anyways. kindly share log

@Bwhite
you running quite high timing with lean AFR, personally i would never will that lean. 11.5/11.8 is good and safe with 16/17 degree timing.

 

[dsm-onster]

Ok, theres no restriction when his setup is seeing 50lb/min at 8000rpms, with that turbine wheel.

As well, he is running e85. it likes that 'gas scale' af ratio very well. A decent intercooler, and he'll never see knock. Research e85 to find out what most end up settling on for 'gas scale' af ratio using e85.... Concerning timing. 16-17º is very low for e85. He has wiseco pistons. Most run 8.3s, but even if he has the 9.0CR wisecos, your suggested timing number is *typically* very conservative; all because of the burn rate of e85. From my experience, ethanol likes a mbt about the same as gasoline at at least over 1 compression point lower. As a consequence, stock 1g timing maps typically work well with 8.8-9:1CR ethanol builds.

I have fixed all major boost leaks, I have no pre-turbo exhaust leaks. I have pulled the wastegate hose off and straped the flapper door shut. This is in the orginal 12cm turbine housing. Im running a 3inch vband directly off the turbo, so there shouldnt be any exhaust restrictions. Link shows im only flowing 50 lb/min by 8k. What am I missing here? I thought that this turbo was supposed to put out insane amounts of boost. . At least more the 30 psi.

You are confused or confusing us. First off 50lb/min is around 500ish hp with a good tune, as mentioned. Seeing that airflow on a t31 (t3 stage 3) size turbine wheel at 30psi means you're doing fine in the flow department.

You bring up not being happy with the airflow, then lament that you thought the hx35 'is supposed to put out insane amounts of boost'. Boost is not flow. You do know that YOU, not the turbo, controls boost for the most part, correct??? As mentioned, your flow number looks fine for your setup. So, knowing that 50lb/min is a good number for a meduim size turbine housing and that size turbine wheel at mearly 30 psi with a 2.0l, you need to recognize that flow isn't boost; rather boost alters flow. And further, be overjoyed, you made great flow at 30 psi because the 7blade compressor map shows good efficiency beyond 50lb/min up to 40psi.

You have 'insane boost' in it still. When you decide that about 500hp worth of airflow isnt enough, you have 10 more psi to use with a simple gate adjustment. If your system isnt making in the relm of 500hp, then at this point you cant blame parts that solely alter airflow, like turbos, cams, and manifolds.

 

[techghost]

@dsmoster
i guess bwhite is concerned on the boost he is making, if i've got his point correctly then he mean that he can get past 30psi even with the wastegate disconnected.

to me, there are a few things to consider.
- there is a preturbo leakage
- a big boost leak
- shot WG
- restriction in exhaust.
- check hot side/turbine blades to see if there are broken or damaged.

Keep us posted!!

50lbs on 30psi to me seems quite ok, some ppl are making more then 50lbs on 30psi but with cams, IM and TBs.

 

[bwhite]

What im saying is that is all I can get out of it. Like I stated I strapped the wastegate door shut. I thought that I should be able to get more boost and flow from this turbo as it is rated at 65lb/min. I didnt say that I was unhappy with it. I just want to get all of it out or at least see 60lb/min. I am running 9.0-1 wisecos with no knock. I bought bigger injectors 1650 blue maxs. Then attemped to up the boost. It will NOT GO ANY HIGHER! I tried to find a good boost leak test video that shows a good system to see if im doing something wrong. I cant find one. Maybe I just have more boost leaks.

 

[habitatguy187]

When you pressurize the system during a BLT, how long does it take to bleed down to 0 from say 25psi?

 

[bwhite]

I will video it tonight. Its pretty quick to 3psi from only 15 psi.

 

[techghost]

^^ there u go

 

[joyfil2001]

What boost controller are you running?

 

[bwhite]

What boost controller are you running?

NONE! Im getting some bubbling from what sounds like the oil drain im told some is normal, but how much? I thinking that the seals in the turbo might be bad. It doesnt make any sense though I just rebuilt it over last winter.

 

[joyfil2001]

NONE! Im getting some bubbling from what sounds like the oil drain im told some is normal, but how much? I thinking that the seals in the turbo might be bad. It doesnt make any sense though I just rebuilt it over last winter.

Forgive me if I'm wrong, but I believe your valve seals are leaking. That may be your problem. How old is the motor?

 

[black_gst]

NONE! Im getting some bubbling from what sounds like the oil drain im told some is normal, but how much? I thinking that the seals in the turbo might be bad. It doesnt make any sense though I just rebuilt it over last winter.

The seals in the turbo arent 100% sealed, its more like a piston ring, so bubbling is just air getting past the seal and going through the oil return into the oil pan... which is normal

 

[joyfil2001]

The seals in the turbo arent 100% sealed, its more like a piston ring, so bubbling is just air getting past the seal and going through the oil return into the oil pan... which is normal

But to what extent? He said it drops in psi fairly quickly.

 

[black_gst]

Well if its a major concern take the turbo out of the picture by blt at the ic piping or the ic itself

 

[bwhite]

Well if its a major concern take the turbo out of the picture by blt at the ic piping or the ic itself

But doing that doesnt do anything for me because I need to test the whole system. In my opinion that whole be like bypassing or ignoring a potential problem not fixing it. Im going to test it in about an hour and ill be back with results and video.

 

[joyfil2001]

But doing that doesnt do anything for me because I need to test the whole system. In my opinion that whole be like bypassing or ignoring a potential problem not fixing it. Im going to test it in about an hour and ill be back with results and video.

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.

 

[bwhite]

Heres those logs

 

[bwhite]

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.

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