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Rear mount effect on reading a Compresssor map

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Old May 11, 2008 | 08:11 AM
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Default Rear mount effect on reading a Compresssor map

I am just wondering dose it make a diffrence it the turbos mounted in the rear when using a compressor map to pick a turbo for a particular car .

If so whitch way dose the ploted point move to the left of the map or the right side ?
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Old May 11, 2008 | 09:00 AM
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Mounting a turbo in the rear doesn't change where the compressor runs on the map, only the turbine.
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Old May 11, 2008 | 09:44 AM
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Originally Posted by engineermike
Mounting a turbo in the rear doesn't change where the compressor runs on the map, only the turbine.
Thanks . What diffrences in the turbine should I look for
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Old May 11, 2008 | 10:53 AM
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Originally Posted by CamaroSS19
Thanks . What diffrences in the turbine should I look for
It's going to take a higher pressure ratio to extract the same amount of power from the turbine due to the cooler exhaust gas.
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Old May 11, 2008 | 06:25 PM
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Originally Posted by engineermike
It's going to take a higher pressure ratio to extract the same amount of power from the turbine due to the cooler exhaust gas.
So you mean I will just need runn a bit more boost
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Old May 11, 2008 | 07:13 PM
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Originally Posted by CamaroSS19
So you mean I will just need runn a bit more boost
No. I'm saying that for any given boost level and air flow, you'll have more exhaust pressure and less overall hp.
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Old May 11, 2008 | 09:08 PM
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Originally Posted by engineermike
No. I'm saying that for any given boost level and air flow, you'll have more exhaust pressure and less overall hp.
So then theres nothing you can do but get the turbo closer .
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Old May 12, 2008 | 02:02 AM
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Originally Posted by CamaroSS19
So then theres nothing you can do but get the turbo closer .
this has been covered alot before. stick to stock manifolds as these reatian the heat better. coat them if you can. get the exhaust (from manifolds to turbo) coated (if you can) and at least wrap them.

all these things should help.

Chris.
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Old May 12, 2008 | 06:28 AM
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Originally Posted by chuntington101
this has been covered alot before. stick to stock manifolds as these reatian the heat better. coat them if you can. get the exhaust (from manifolds to turbo) coated (if you can) and at least wrap them.

all these things should help.

Chris.
Yeah I kow that has been covered alot . I wasnet asking anything about how to make it spool .

I am looking to pick the right turbo for my app with a compresor map ,I just needed to know if the ploted points move when the turbo is monted(ie less effecint) in the rear
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Old May 12, 2008 | 10:20 AM
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Originally Posted by CamaroSS19
Yeah I kow that has been covered alot . I wasnet asking anything about how to make it spool .
CamaroSS19, what chuntington101 was saying is still applicable. The hotter you keep the exhaust the more effecient and less back pressure you will have. Keeping the heat in isn't just about spooling the turbo.
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Old May 12, 2008 | 05:44 PM
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Originally Posted by Zombie
CamaroSS19, what chuntington101 was saying is still applicable. The hotter you keep the exhaust the more effecient and less back pressure you will have. Keeping the heat in isn't just about spooling the turbo.

Ok just thought I was getting jumped on to used the search ,whitch I did its just hard to find specifics
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Old May 12, 2008 | 06:46 PM
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Ok... basic thermodynanic theory.. power is extracted through temperature and pressure

by reducing temperature you need to increase pressure. to achive this you will need to choose a slightly smaller turbine.

turbines are volume flow devices and less temperature means less volume flow
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Old May 13, 2008 | 01:48 AM
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Originally Posted by DanO
Ok... basic thermodynanic theory.. power is extracted through temperature and pressure

by reducing temperature you need to increase pressure. to achive this you will need to choose a slightly smaller turbine.

turbines are volume flow devices and less temperature means less volume flow
so you can basically spec your turbo for the power you want, then select a slightly smaller hot side A/R to compensate???

CamaroSS19 i wasn't having a go mate. sorry iof it sounded that way.

Chris.
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Old May 13, 2008 | 05:57 AM
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Originally Posted by chuntington101
so you can basically spec your turbo for the power you want, then select a slightly smaller hot side A/R to compensate???

CamaroSS19 i wasn't having a go mate. sorry iof it sounded that way.

Chris.
Sorry no problem man

That sounds like a good idea
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Old May 13, 2008 | 12:23 PM
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Yes the compressor map is effected to a certain degree. If you alter the turbine map, you alter the compressor map. So its in-directly effected, but effected none the less.
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