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As the topic suggests... what compression ratio are you running and what FI are you using (eg. s/c or turbo)?
-Mike
98 Contour SVT
Toreador Red #49 of 6535 Built on 3/25/97
WR Headers, Borla Cat-Back, Torsen T2 LSD, K&N Short Ram, S-AFC and Focus Shift Tower
85 Camaro
1969 358ci, 97 TA interior, 91 Z28 GrdEfx and Aero Wing 255rwhp
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Originally posted by CSVT#49:
As the topic suggests... what compression ratio are you running and what FI are you using (eg. s/c or turbo)?
Going to try this one again I see. Last thread you got a little uptight but I think it was all because you didn't realize the first guy to respond was actually trying to help you out rather than be a smartass.
Okay, I run 10:1, the stock 3L compression. The best compression to run for these engines is IMHO between 9 and 10 to 1 for a turbo. For the supercharger I think it is best to stay at 10:1.
The only reason I can see to get custom pistons is if you are going all out racecar or dyno queen where you will be extracting huge amounts of power. Otherwise the stock 2001+ piston design at 10:1 compression will easily support 10psi on a daily driver, be cheaper to setup and give you less headaches in the long run.
Think of the dividing line as about 400 wHP. If you want around 400wHP or more to start with, then I believe you should go with forged pistons around 9.0 to 1.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
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Originally posted by gotapex:
8.8:1
Twin turbo
Yeah sure, I bet it's also mid-engined with rear wheel drive 
Matt
2002 Subaru Impreza WRX (WRB Stage 4+)
Old Rides:
1999 Sil-Fro SVT Contour 3.0L with goodies (Totalled 6/21/06)
1988 Bronco II (Sold)
You know you launch hard when you beat oncoming traffic through their own crosswalk lines.
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Originally posted by warmonger :
Okay, I run 10:1, the stock 3L compression. The best compression to run for these engines is IMHO between 9 and 10 to 1 for a turbo. For the supercharger I think it is best to stay at 10:1.
Thanks. That was exactly what I was looking for. Do you think the factory HO 2.5L pistons can hold up to 10psi as well?
Originally posted by gotapex:
8.8:1
Twin turbo
I don't suppose you have pics of that somewhere (previous post or something)? Sounds pretty crazy.
-Mike
98 Contour SVT
Toreador Red #49 of 6535 Built on 3/25/97
WR Headers, Borla Cat-Back, Torsen T2 LSD, K&N Short Ram, S-AFC and Focus Shift Tower
85 Camaro
1969 358ci, 97 TA interior, 91 Z28 GrdEfx and Aero Wing 255rwhp
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You really need to search better, honestly. Nonetheless 1)gotapex has a Noble, hence the twin turbo (search gotapex in the Pics forum  ) 2)I ran 12psi on a stock 2000 SVT (but not for much longer - going 3L) - but if you have a pre-2000 Duratech, running more than 10psi is probably gonna get you a broken piston seal land...the early pistons have a thinner, weeker top land than has broken on quite a few CEGers running boost. And yes, that is bad.
2000 SVT Turbo 295hp/269ftlb@12psi
#1 for Bendix Brakes Kits!
Knuckles rebuilt w/new bearings $55
AUSSIE ENDLINKS $70
Gutted pre-cats $80/set
A lack of planning on your part does not constitute an emergency on mine!
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9.5:1 (accomplished with headwork, combustion chambers were CC matched as well) with +1mm SP pistons (not forged, but better than OEM) in my turbo 3L.
2005 Ford F150 SuperCab FX4
1964 Chevrolet Impala SS
1998 CSVT: 354HP/328TQ @ 10 psi, now gone 
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Originally posted by Stazi:
You really need to search better, honestly.
Nonetheless
1)gotapex has a Noble, hence the twin turbo (search gotapex in the Pics forum )
2)I ran 12psi on a stock 2000 SVT (but not for much longer - going 3L) - but if you have a pre-2000 Duratech, running more than 10psi is probably gonna get you a broken piston seal land...the early pistons have a thinner, weeker top land than has broken on quite a few CEGers running boost. And yes, that is bad.
Ditto. What he said. 
If I were you, 6-7 pounds max on pre-2000 ifyou want it to last.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
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Originally posted by warmonger:
Originally posted by Stazi:
You really need to search better, honestly.
Nonetheless
1)gotapex has a Noble, hence the twin turbo (search gotapex in the Pics forum )
2)I ran 12psi on a stock 2000 SVT (but not for much longer - going 3L) - but if you have a pre-2000 Duratech, running more than 10psi is probably gonna get you a broken piston seal land...the early pistons have a thinner, weeker top land than has broken on quite a few CEGers running boost. And yes, that is bad.
Ditto. What he said.
If I were you, 6-7 pounds max on pre-2000 ifyou want it to last.
Scotts 98 SVT lasted 26k miles on 8 psi. Just one ref
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