US spec 2.5 STI short engine part no required
15 October 2003, 08:30 PM
#61
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if I wanted to use the stock US 2.5 STi (EJ257) shortblock with the EJ257 oem 0.8mm gasket with my Phase 2 heads the CR should be:
deck clearance volume = 2.96cc
dish volume = 22cc
.8mm gasket volume = 6.22cc
head volume = 49.6cc
Total compressed volume = 49.6+6.22+22+2.96 = 80.78cc
Total swept volume = 614.28cc
CR = (614.28 + 80.78) / 80.78
CR = 8.604:1
Carlos H.
deck clearance volume = 2.96cc
dish volume = 22cc
.8mm gasket volume = 6.22cc
head volume = 49.6cc
Total compressed volume = 49.6+6.22+22+2.96 = 80.78cc
Total swept volume = 614.28cc
CR = (614.28 + 80.78) / 80.78
CR = 8.604:1
Carlos H.
15 October 2003, 10:00 PM
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deck clearance volume = 2.96cc
dish volume = 22cc
1.4mm gasket volume = 10.886cc
head volume for PHASE 1 = 46.5cc
Total compressed volume = 46.5+10.9+22+2.96 = 82.36cc
Total swept volume = 614.28cc
CR = (614.28 + 82.36) / 82.36
CR = 8.458:1
Carlos H.
[Edited by carlos_hiraoka - 10/15/2003 11:40:21 PM]
15 October 2003, 11:42 PM
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Edited post , 550's will come handy, although with 4bar pressure diferential ..... some more EJ257 data:
Bore: 99.5mm (3.92in)
Stroke: 79.0mm (3.11in)
Displacement: 2,457cc (150 cu.in.)
US2.5 STi CR: 8.2:1
Carlos H.
[Edited by carlos_hiraoka - 10/15/2003 11:43:58 PM]
, 550's will come handy, although with 4bar pressure diferential ..... some more EJ257 data:Bore: 99.5mm (3.92in)
Stroke: 79.0mm (3.11in)
Displacement: 2,457cc (150 cu.in.)
US2.5 STi CR: 8.2:1
Carlos H.
[Edited by carlos_hiraoka - 10/15/2003 11:43:58 PM]
15 October 2003, 11:48 PM
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Looks cr over 8,4:1 dangerous?
What I can expect? What I have to do with maps. More fuel?
Decrease retard in timing?
What I can expect in bhp and torque figures?
What I can expect? What I have to do with maps. More fuel?
Decrease retard in timing?
What I can expect in bhp and torque figures?
16 October 2003, 06:52 AM
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Hi Carlos - when did you get 1 bar in 4th with the td05fe on the 2.5? With stock collector or after market headers? And I don't supposed you measured turbo outlet temps running 1 bar at 6k? 
I'll be running my ~8.5:1 ej25 build with this turbo for intial mapping.
Richard
I'll be running my ~8.5:1 ej25 build with this turbo for intial mapping.
Richard
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