Questions for Justin...

[stracer107]

On your 420a car? I'm

No I should have specified. My 96 talon awd.

 

[3kgt2nv]

a friend just picked up these holset35s for a tt v8 build and i was trying to figure out what they are from since we cant find vbands for them.

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[Archer Fabrications]

http://www.streettunedmotorsports.com/parts/pte_turbo_e_s_cover_oring.htm

Would this work on my hx40 since it has the provision? I dunno if it will be too small or not, guess I'll give it a shot but I'm curious if you know.

 

[JusMX141]

a friend just picked up these holset35s for a tt v8 build and i was trying to figure out what they are from since we cant find vbands for them.

Looks like a CNG application- the center housings don't happen to have coolant ports, do they?

STM: PTE | PRECISION TURBO & ENGINE | E & S COMPRESSOR COVER O-RING | 070-S705-25

Would this work on my hx40 since it has the provision? I dunno if it will be too small or not, guess I'll give it a shot but I'm curious if you know.

No. Your cover may appear to have the groove cut into it, but the center housing does not. You'll never get the snap ring to fit into the groove if you try to use an o-ring. Ask me how I know.

 

[Archer Fabrications]

Damnit...

 

[Ricardo]

Short answer: It doesn't.

Changing the turbine has no effect on the efficiency of a given compressor. When you look at the compressor map, you see only the efficiency of the compressor at various flow rates and pressure ratios (sometimes there are also shaft speed lines). This is always the same for a given compressor wheel. You try to size the hotside so that you run the compressor through the best efficiency islands for the flow rate you'll actually see at the boost pressure you'll target.

What changing the hotside does do however, is change the efficiency of the engine. A larger turbine wheel/housing offers less restriction to flow, thereby increasing the engine's volumetric efficiency. It will also place a given compressor into a different flow versus pressure ratio on the compressor's map.

If you haven't seen this page yet, it is worth more than a quick skim:
Stealth 316 - Turbocharger Compressor Flow Maps

Thank you!! I always had this question in my mind: if the compressor map was independent on the turbine wheel used or if it was matched to a certain turbine wheel. I feel stupid now, but I will refer to the page sent and give it a good long read.

So a problem in a setup of small turbine wheel would lies in the restriction of exhaust flow (backpressure), it all makes sense now. It sucks that hardly we are provided with any turbine maps (though I don't know how to read those yet), so I still have some trouble determining what would be the optimal turbine size/flow for a certain compressor.

If I may, I'd like to shoot another question. Let's take Turbonetics, for example, they offer a large variety of turbine wheels to pair with their compressors-- how would one go about determining what would be efficient combo or not?

Thanks.

 

[LandSpeed-DSM]

Which is basically what I described in posts 2084/2087..

For your new question.. As an example: Traditionally in diesels, turbine wheels are matched to displacement, VE and redline. Then housings are used to control boost (many if not most diesel applications do not use wastegates) and decided boost threshold (spool/lag/response).

A similar approach can be employed in gasoline engines. A famous example being the debate in Radial Tire classes over the displacement "limit" for a G-Trim turbine wheel.. in my experience often argued to be around ~360CID on full-boogie motors. There are of course certain assumptions being made about redline and VE in these discussions.

This is obviously a bit of a simple explanation, a more thorough one would take considerable time to post up. Someone will inevitably disagree with a certain facet of it, but you do choose wheels primarily on peak effective displacement. Other details of setup or use will skew that decision some.

How you decide on a compressor/turbine combo in a performance application depends on a great number of factors. If you have an example application and use in mind, that may help this explanation be brought home so to speak.

 

[Alan11]

Is this 14b worth $200, owner claims it has been rebuilt 4 years ago..<a href="http://s1087.photobucket.com/user/Alangsx/media/Screenshot_2013-09-27-19-06-43-1_zps186548c3.png.html" target="_blank"><img src="http://i1087.photobucket.com/albums/j472/Alangsx/Screenshot_2013-09-27-19-06-43-1_zps186548c3.png" border="0" alt=" photo Screenshot_2013-09-27-19-06-43-1_zps186548c3.png"/></a>





<a href="http://s1087.photobucket.com/user/Alangsx/media/Screenshot_2013-09-27-19-06-47-1_zpsf24d48ed.png.html" target="_blank"><img src="http://i1087.photobucket.com/albums/j472/Alangsx/Screenshot_2013-09-27-19-06-47-1_zpsf24d48ed.png" border="0" alt=" photo Screenshot_2013-09-27-19-06-47-1_zpsf24d48ed.png"/></a>

 

[Bud92gsx]

Is this 14b worth $200, owner claims it has been rebuilt 4 years ago..<a href="http://s1087.photobucket.com/user/Alangsx/media/Screenshot_2013-09-27-19-06-43-1_zps186548c3.png.html" target="_blank"><img src="http://i1087.photobucket.com/albums/j472/Alangsx/Screenshot_2013-09-27-19-06-43-1_zps186548c3.png" border="0" alt=" photo Screenshot_2013-09-27-19-06-43-1_zps186548c3.png"/></a>





<a href="http://s1087.photobucket.com/user/Alangsx/media/Screenshot_2013-09-27-19-06-47-1_zpsf24d48ed.png.html" target="_blank"><img src="http://i1087.photobucket.com/albums/j472/Alangsx/Screenshot_2013-09-27-19-06-47-1_zpsf24d48ed.png" border="0" alt=" photo Screenshot_2013-09-27-19-06-47-1_zpsf24d48ed.png"/></a>

Any in out,side to side play? Comes complete with wg and turbine housing?

 

[JusMX141]

It's worth whatever you're willing to pay. I'd say that's too much unless it can be proven that the turbo was indeed rebuilt.

 

[Bud92gsx]

No JW on the comp wheel

 

[JusMX141]

Hard to sign 14B/17C/19C wheels...not enough space between the compressor blades- but I don't paint actuators black unless the owner specifies (which I don't think they've ever done), so that's definitely not my work.

 

[Bud92gsx]

That answers why I have NO sig on my comp wheel.

 

[Alan11]

No in and out shaft play and comes with WG. Yeah ill just wait. I can't trust a 4 year old "rebuilt"

 

[JusMX141]

Hi Justin.

I have here an TD05HRA-16G6-10.5T from an EVO 6 TME RS2, tial turbine.
Nice condition but i look for a good rebuild kit.
Let me know if i could use a TraderGreg TD05 kit or maybe a best mind like thrust bearing upgrade.

Thanks.
Remy

You'd need a TD05HR rebuild kit with a thrust plate for a reverse-rotation turbo....I'm not sure TraderGreg offers a kit to service this.

Look into the kits sold by Kamak Dynamics / Kinugawa or Zage....they have OEM-type kits with upgraded thrust plates and wider thrust collars for TD05HR turbos.

 

[ColtiXim]

Thanks for fast response Justin
Ordered the Kinu kit .

 

[Bud92gsx]

JW quick question.

If i went with one of those 17/18 psi wg. Would i see any increase/decrease in spool time,staging rpm?

 

[JusMX141]

I don't see how a wastegate actuator is going to change spool...the flapper stays closed until the max boost level is achieved, then it opens.

It would allow you to hold a higher boost level if your turbo is capable of doing so. A weak actuator will not modify spool time but it will cause boost spikes / drops depending on the boost level you're trying to achieve. You can only run as much boost as the spring tension of the acutator will allow.

When using a smaller turbo, as the RPM's go up the engine consumes more of the airflow that the turbo produces...so the flapper will slowly close to direct more exhaust flow through the turbine housing. If the spring's not strong enough to pull the flapper closed once it's open, your boost level will tank as your RPMs climb. Now this only goes so far- if the turbo is too small, the compressor can't possibly generate enough airflow to keep the boost level up in the higher RPMs.

 

[Bud92gsx]

The last I drove it i was not getting spike or creep..And the boost did not drop at all.

Just thinking ahead for moar boost ya know.

 

[Archer Fabrications]

Justin, next time at the track with c16 were gonna see come crazy shit out of my 2g and hx40. Working on mass weight reduction/wire tuck and slicks. Was already at 36psi on my 11.1@132.

Hello 2g hx40 record, I'm comming for you. (Current 10.2 with nitrous, 10.3 without) has dave seen an airflow wall yet?

I'm hoping for some magic at 38psi but I'm wondering if the 12 blade turbine would hold me back compaired to the 10 dave has.

 

[JusMX141]

Justin, next time at the track with c16 were gonna see come crazy shit out of my 2g and hx40. Working on mass weight reduction/wire tuck and slicks. Was already at 36psi on my 11.1@132.

Hello 2g hx40 record, I'm comming for you. (Current 10.2 with nitrous, 10.3 without) has dave seen an airflow wall yet?

Nope.

I'm hoping for some magic at 38psi but I'm wondering if the 12 blade turbine would hold me back compaired to the 10 dave has.

That's great, but Dave's turbo uses a 12-blade turbine.

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[Archer Fabrications]

Oh wow i didn't know that! Makes me feel better, i thought "super40" consisted of a 60mm compressor and 10 blade turbine. Sweet. Fun time

 

[Ghost_92TSi]

No in and out shaft play and comes with WG. Yeah ill just wait. I can't trust a 4 year old "rebuilt"

The turbo belongs to me. I told you I would meet you to check it out and you bailed. I had the turbo as a back up, I am selling this one to rebuild a 16g and have that one as a back up instead. The car was down when I got that one rebuilt, and by the time I got the car together I already upgraded. I understand you want to be safe and question it, but that is why I said to come look at it. Although, I think it is ironic that you are trying to sell a t-25 and a 13b both with IN&OUT. There is at least a demand for a 14b, as you said yourself Justin doesn't have any in stock. And any in&out play is bad news. But feel free to check it out still, like I said I'm not in a hurry to sell it, It is my only back up and it has been sitting on top of my stereo for over 4 years causing no issues. Just decided to list it as part of my garage cleaning because I'm trying to liquidate all the extra parts if I can before I decide to just toss them out.

 

[RonRonTSI]

I have a hx52 that's in pretty decent shape. Do you think there's a way to improve performance maybe faster spool etc. ?

 

[Archer Fabrications]

Machine and weld a vband to a .70 AR bep hx40 housing to fit the hx52