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compression ratio 

 

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 Post subject: compression ratio
Posted: Sun Feb 26, 2006 9:41 pm 
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what is the best compression ratio for a turbo eb falcon runing a GT40 turbo
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Posted: Sun Feb 26, 2006 10:08 pm 
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As it is std at 8.8 unless its a XR6?? Or had head machined ....

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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Posted: Mon Feb 27, 2006 12:57 am 
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unless its a 3.9l eb it will have 9.2:1, xr6's were 9.6:1 from memory...

i would recommend low 8's, ive set mine up at 8.4:1 and looking to run 15-18psi and make 320rwkw

 

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EB 4L, 8.4:1, R154, GT4202r, 4in exhaust, Greenslade Engineering exhaust manifold, plenum chamber, 90mm throttle, Garrett W2A cooler, Surecam custom, autronic SM4, Bosch 120lb, Crane HI-6, LX-92, LM-1, Turbosmart Reg, 2x bosch 044, turbosmart 48 gate. 470kw+ @ 18PSI

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Posted: Mon Feb 27, 2006 10:07 am 
Getting Side Ways
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Age: 64

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Power: 482 rwkw

Location: Penrith
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An EB with Crow cam 2222519 can run up to 18 Lb @ 280 rwkw Low 11 second 1/4's..
Spark at this boost is 8* advance though...
With 8.8 compression...There's plenty of std engines runing boost with std compression..Its more to do with TUNE!!
Personally up to 20 Lb is o/k with 8.8 but at that level I'd prefere 8.5 /8.2 with more advance..But it depends what power you are after?? For street 8.8 and 12 Lb would awsome..With this compression there's power and engine responce under boost...
To give you an idea what compression can do my V8 is 7.9 compression advance can go as high as 45* but on max torque curve on 18 Lb boost timing is 22* while fuel ratio is 11.5....There are other variables to consider like some cams bleed off some compression etc...Generally the 6 is more tollerant to detonation than V8's bigger bore...The smaller flame travel helps...

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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Posted: Mon Feb 27, 2006 5:24 pm 
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Thanks guys you have been a great help.
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