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Old 09-27-2011, 09:39 AM   #1101
west_minist
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Jeff:

Anything more to add?
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Old 10-01-2011, 10:31 PM   #1102
Bariga
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jeff you still have efr installed?
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Old 01-03-2012, 10:07 PM   #1103
turbodelta
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Hello to all, i reached this very informative forum and especially this Perrin
thread about the GTX and BW turbo from a google search, as im more into
Lancia Delta HF Integrale modifications, im looking after for some additional
informations especially about the external dimensions of the compressor
housing of both turbos wich i can't find on the manufacturers websites,
we've build some hybrid GT30 for our cars, as for space reasons we can't
go with too large compressor housings. Wich makes it even more complicated
if we would go for a longer turbo. So we need some more informations for our
next project car.

Does anyone have a OD of a EFR7064 external WG T4 compressor/turbine
housing as pictured ?



PS: Sorry for my bad english
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Old 01-08-2012, 10:19 PM   #1104
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turbodelta - You should contact Geoff at Full Race and he will get you the information you need, http://www.full-race.com/.
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Old 01-10-2012, 09:46 PM   #1105
tanker_wx
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7670 vs GTX35r
i still have no idea
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Old 02-13-2012, 01:56 AM   #1106
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Quote:
Originally Posted by tanker_wx View Post
7670 vs GTX35r
i still have no idea
me niether, regarding efr, could it be cams holding it back up top & not compressor ?
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Old 02-13-2012, 02:25 AM   #1107
maxpowr
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subscrib'd
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Old 03-10-2012, 07:26 AM   #1108
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Quote:
Originally Posted by PERRINJeff View Post
As many of you know I had had somewhat of a wasted dyno session/weekend dealing with the medium pressure actuator for the EFR. Essentially what it comes down to is our Subarus run high enough exhaust backpressure that some autowastegating occurs. This is when the exhaust pressure is pushing open the wastegate door not the wastegate actuator..
Jeff, can you go into a bit more details about how this autowastegating happens?

Last edited by Vlad; 03-10-2012 at 07:47 AM.
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Old 03-10-2012, 08:40 AM   #1109
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Force = Pressure * Area

High EGBP increases the pressure on the WG door, increasing the force required for the actuator to hold the door shut at a given pressure in the compressor.

End result: spring pressure rating doesn't match the manufacturers spec. As a result you have to peg the WGDC or MBC to hold boost, which will only get you so far without a large surface area actuator.
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Old 03-10-2012, 10:39 AM   #1110
Vlad
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For the gate to open, the spring and actuator pressure has to be defeated.
An increase in backpressure will directly contribute to press the gate shut, from the back of it.
The pressure in the up-pipe is always higher, but that's why we have a spring and an actuator that converts compressor pressure into closing force.

The flow of gas has a static component, where gas is just stored inside the turbo, behind the wastegate. The position of the wastegate can be looked at in terms of pressures.
But then the flow through the turbine determines the momentary pressure in the uppipe.
The gases pass through the turbine, lose energy and slow down. They exit at a flow rate that has to do with the turbine parameters. For the pressure in the uppipe to be increased, this flow would have to be affected severely.

Another thing is that APS had backpressure test results on their page and those numbers were not really big, even for exhausts that were below 3".
This is also noticed by people that upgrade from 2.5 to 3" and don't report much of a change.

So, while I'm sure there is an explanation, I'd like to get more details.

I think that this has to do with what happens in the turbine at compressor boost threshold.
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Old 03-10-2012, 11:00 AM   #1111
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I don't know what egbp #'s you've seen but the ideal ratio is 1:1 boost to egbp so for 20 psi boost you would want about 20 psi egbp. The ratio is higher during spool up too. Subarus never acheive this 1:1 ratio and in reality more in the realm of 1.5 to 2.0.

Think about this then, a turbo running 20 psi with a 1.5:1 boost/egbp ratio would have 30 psi egbp steady state, but much higher egbp during spool up.

While its not crazy pressure I could easily see 30-50 psi forcing open the wastegate against a weak spring.
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Old 03-13-2012, 11:50 AM   #1112
Bariga
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that's why u need good actuator with beefy spring, look at tial 15 psi spring that **** looks like it came out from Hondas strut
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Old 03-13-2012, 05:03 PM   #1113
wrxsubiemod
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Lol its harder to install than a honda springs
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Old 11-14-2012, 12:47 AM   #1114
tanker_wx
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looks a very nice turbo.
never seen it in china mianland.
i would like to try, and make a comparation with my ATP GTX35R.
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Old 11-14-2012, 11:39 AM   #1115
Bariga
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Quote:
Originally Posted by kellygnsd View Post
I don't know what egbp #'s you've seen but the ideal ratio is 1:1 boost to egbp so for 20 psi boost you would want about 20 psi egbp. The ratio is higher during spool up too. Subarus never acheive this 1:1 ratio and in reality more in the realm of 1.5 to 2.0.

Think about this then, a turbo running 20 psi with a 1.5:1 boost/egbp ratio would have 30 psi egbp steady state, but much higher egbp during spool up.

While its not crazy pressure I could easily see 30-50 psi forcing open the wastegate against a weak spring.
I did the test on back pressure about 1 month ago and it was 1:1 all round. at 25 psi to id get 25 psi of back pressure.
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Old 11-14-2012, 12:00 PM   #1116
kellygnsd
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Did you log it via Vipec. Its love to see the data during spool up.
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Old 11-14-2012, 12:28 PM   #1117
Bariga
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no just to my defi boost guage,
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Old 11-14-2012, 03:09 PM   #1118
martynj
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Quote:
Originally Posted by tanker_wx View Post
7670 vs GTX35r
i still have no idea
7670 will spool faster, GTX35R will make more power !
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Old 11-15-2012, 03:54 PM   #1119
reid-o
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Quote:
Originally Posted by kellygnsd
I don't know what egbp #'s you've seen but the ideal ratio is 1:1 boost to egbp so for 20 psi boost you would want about 20 psi egbp. The ratio is higher during spool up too. Subarus never acheive this 1:1 ratio and in reality more in the realm of 1.5 to 2.0.

Think about this then, a turbo running 20 psi with a 1.5:1 boost/egbp ratio would have 30 psi egbp steady state, but much higher egbp during spool up.

While its not crazy pressure I could easily see 30-50 psi forcing open the wastegate against a weak spring.
Is the back pressure due to the head design or the extensive preturbo piping? I've always wondered.
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Old 12-04-2012, 04:19 PM   #1120
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Has any one fitted one to a 2.1 engine yet any figures ect ?
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Old 12-04-2012, 11:21 PM   #1121
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"Where is UPS??"

I know that feeling well, hah. Great thread, I have a catch up reading to do.
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Old 02-02-2013, 09:35 PM   #1122
MMY MSL
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Any release date ETA?
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Old 02-03-2013, 01:34 AM   #1123
mofoSTI
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Fantastic write up! Cant wait to see more results from different builds.
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Old 01-13-2014, 02:31 PM   #1124
Mr_Flamenco
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Guys I know i am reactivating a very old thread,
and i am really sorry for that but, but i am pretty desperate, I have spent pretty much last two days reading almost every post on this thread and there is wealth of knowledge gained,

So thanks every one on making this thread all what it became,
Thank you Perrin for all the testing and time put into this.

so here comes my stupid question,
I have seen how much it makes on dyno, and it is mostly aimed for street race or drag strips.

-however I am into drifting, has any one used the EFR 7670 for drifting applications? on 1JZ-GTE engine?

- I am from Oman (country in hot Middle East), tempreture rises to 50 C (120F) during the summer which is 8 month of the year and that is when most of the drifting events happen. hence High boost are not an option for me, my max boost will be 1 Bar to 1.2 Bars, can this turbo delivers good HP around that boost? (we are pretty much at sea level).

-The problem is I have read so much about the EFR, and fallen in love with it, that i dont even want to look at garrett GTX series.

please help a brother.

Thank you
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