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Old 08-12-2012, 12:22 PM   #81
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Old 08-12-2012, 04:48 PM   #82
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1st place in the national drag championship?
Great :-)
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Old 08-13-2012, 08:27 AM   #83
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I belive you are talking about the twin scrool setup, when you are talking about exhaust parts there is no inlet as inlet is specific to air induction.It's not a good idea to put twin-scrool turbocharger on a normal T4 flange as you will create a lot of backpressure in the manifold because of the middle split of the turbine housing. Bafta!
Not true at all. All data says otherwise. Twin scroll > All. You'r turbine size is the biggest factor for backpressure. From what I've seen there are no twin scroll manifolds available.
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Old 08-13-2012, 12:49 PM   #84
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Great job! 42R ftw
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Old 08-13-2012, 02:37 PM   #85
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Not true at all. All data says otherwise. Twin scroll > All. You'r turbine size is the biggest factor for backpressure. From what I've seen there are no twin scroll manifolds available.
So I can run a twin scroll turbine on a normal T4 manifold?

Thanks Doc, I will go with the 42R.
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Old 08-13-2012, 04:04 PM   #86
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Not true at all. All data says otherwise. Twin scroll > All. You'r turbine size is the biggest factor for backpressure. From what I've seen there are no twin scroll manifolds available.

What data?Show us please.
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Old 08-13-2012, 04:09 PM   #87
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So I can run a twin scroll turbine on a normal T4 manifold?

Thanks Doc, I will go with the 42R.
Don't rush into it and do some more research and you will find out why.
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Old 08-13-2012, 05:19 PM   #88
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What zbarca said.

On the divided issue, I wouldn't run a divided housing with open flange or vise versa for performance reasons. It can be done, and I have seen it executed that way but it was in a situation where the person was working with the parts they had.

I have never seen that type of data recorded, doesn't make much sense to run it this way in the first place. Maybe manifoldmike will have the said data?

Being you already have a custom manifold setup reworking it into a divided version is probably your best option, also giving you a dual gate outlet for better boost control
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Old 08-14-2012, 07:36 AM   #89
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I was referring to a divided turbine with a divided manifold. Doesn't make much sense to run a divided housing on an open manifold because you're not benefiting from pulse division from the manifold. if you have a turbo already with a divided housing, you can either port the division in the middle to a fine point or just buy another housing (depending on the turbo, usually ~$350). Divided housing performance is common knowledge. you guys need some data? why don't you search the interweb like the rest of us. I'll try to see if i can scrounge some stuff up, but i assure you, my "data" won't be a engineering talking point or an end all to the argument.

Little info:
http://www.full-race.com/modified-twinscroll/
http://www.turbodriven.com/en/turbof...gnTurbine.aspx
http://www.turbobygarrett.com/turbob...Tech%20102.pdf
http://www.full-race.com/articles/efrturbotechbrief.pdf

Last edited by manifoldmike; 08-14-2012 at 07:51 AM.
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Old 08-14-2012, 07:56 AM   #90
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What data?Show us please.
I would like to see some data on backpressure differences between a divided housing and a single scroll housing on an an open manifold with both turbine housings being the same A/R.....

Cipri : Sorry for the thread hyjack. Your setup is pretty awesome.

Last edited by manifoldmike; 08-14-2012 at 08:02 AM.
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Old 08-14-2012, 07:59 AM   #91
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LOOOL!I guess you have to read again what I have posted: a divided turbine housing on an undivided manifold will create backpressure because of the divided turbine housing flat split. Read with care before posting bro This was a missunderstanding I suppose and we all agree on one fact: Don't use divided turbine housing on undivided manifold.
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Old 08-14-2012, 08:02 AM   #92
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LOOOL!I guess you have to read again what I have posted: a divided turbine housing on an undivided manifold will create backpressure because of the divided turbine housing flat split. Read with care before posting bro This was a missunderstanding I suppose and we all agree on one fact: Don't use divided turbine housing on undivided manifold.
sort of. I would like to see some data on backpressure differences between a divided housing and a single scroll housing on an an open manifold with both turbine housings being the same A/R..... I don't think it will make much difference. Like the little difference it would make between going for a small turbine housing to a larger housing. My point was that the performance is in the turbine wheel, not the housing. If the guy has a GT42 in grasp for a good price, run it. the turbine housing, divided or not shouldn't make much difference.

Last edited by manifoldmike; 08-14-2012 at 08:04 AM.
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Old 08-14-2012, 08:02 AM   #93
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I would like to see some data on backpressure differences between a divided housing and a single scroll housing on an an open manifold with both turbine housings being the same A/R.....

Sorry for the thread hyjack. Your setup is pretty awesome.
The turbine housing has a flat middle which the gas flow will straight hit, that is gas flow comming back - > backprssure, you will get backpressure in the manifold, you don't need to be an engineer to understand that.

Mike, the thing is that a divided T70 was getting my EGT very high comparing to undivided turbine housing on normal manifold. Same turbocharger different turbine housing as divided/undivided. Those EGT's were that high because of the backpressure and this was on E36 M52B28 Turbo with 3.5" Cometic HG, not stock S54. This theory worked for me to drop the EGT.
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Old 08-14-2012, 08:09 AM   #94
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The turbine housing has a flat middle which the gas flow will straight hit, that is gas flow comming back - > backprssure, you will get backpressure in the manifold, you don't need to be an engineer to understand that.
Well... you sort of do, but ok. your claim has no data to back up. backpressure is a funny thing to generalize.
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Old 08-14-2012, 08:12 AM   #95
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The turbine housing has a flat middle which the gas flow will straight hit, that is gas flow comming back - > backprssure, you will get backpressure in the manifold, you don't need to be an engineer to understand that.

Mike, the thing is that a divided T70 was getting my EGT very high comparing to undivided turbine housing on normal manifold. Same turbocharger different turbine housing as divided/undivided. Those EGT's were that high because of the backpressure and this was on E36 M52B28 Turbo with 3.5" Cometic HG, not stock S54. This theory worked for me to drop the EGT.
EGT is not backpressure. but fair enough. not trying to fight you on this, just that the divided turbine comment is unwarranted. i'm sure i've spewed enough crap for today. my vote is is 42 is fine, divided or not.

Last edited by manifoldmike; 08-14-2012 at 08:14 AM.
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Old 08-14-2012, 08:14 AM   #96
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Well, I just shared my experience with Cipri who is also my fellow contryman, I guess we don't want to see him worried about high EGT's don't we?

Giving my arguments, if not for backpressure, for what was my EGT dangerous high with the divided and cool with the undivided housing?
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Old 08-14-2012, 08:43 AM   #97
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Giving my arguments, if not for backpressure, for what was my EGT dangerous high with the divided and cool with the undivided housing?
so what if your pressure change fro 3:1 to 2:1 with the housing change? you see the difference in egt, but your back pressure is still ridiculous. I used an extreme case here, but you get the drift.

you can tame EGT regardless of pressure with fuel and timing.

EGT is not backpressure... sort of, they are related i will agree with you on that.

Last edited by manifoldmike; 08-14-2012 at 08:53 AM.
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Old 08-14-2012, 09:41 AM   #98
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Mike, I am an engineer, you don't have to tell me that EGT can be dropped by timing retard and fuel enrichment, I already know that but is much easier to find out the problem instead of walking around it. As I said, EGT got stable after I changed the divided housing with an undivided one on an undivided manifold. Backpressure is not EGT but can affect EGT as in my case.

So, for my fellow countryman Cipri, get a different turbine housing for the turbocharger. This is the clean and slick way to do modifications at this level on the S54. If you want to play as all our romanians do, go ahead, but it's not good.
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Old 08-28-2012, 02:39 PM   #99
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New custom aluminium intake manifold, I'm prepared now to raise the boost to 0.6BAR
This weekend I will go to an airport track in Bulgaria to check new 1/4 miles times.
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Old 08-30-2012, 09:18 PM   #100
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You've got good drivability there, if your car had been lighter, like an E30 or E28 that thing would be flying on the racetrack.

Propper plenum there too. Well spec'd to do alot more than 0,6 bar 5 mm material?
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