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Old 10-01-2015, 03:19 PM   #1
JantzenOKC


 
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Optimal compression ratio for boost?

Well since I'm down a motor and the racing season is almost over here anyway, I'm thinking about building a forged motor. What does everyone think the best compression ratio would be for the LFX with twin turbos? Since I would be getting a custom set of pistons made, I could probably make it whatever I wanted. I know Gretchen had some made and was at 10:1 but I don't know if I would really need to be that low or not since we have direct injection. I remember him saying it was missing a little power when not in boost. I wonder if he could do it over again if he would have still went with 10:1 or would he have went a little higher..

Thoughts?
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Old 10-01-2015, 03:30 PM   #2
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Ecoboost is 10.0:1 as well... you'd probably be good there or maybe 10.5:1.
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Old 10-01-2015, 03:35 PM   #3
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Subscribed to this build! Good Luck!!
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Old 10-01-2015, 06:12 PM   #4
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I know your girlfriend probably doesn't approve of this... LOL!

I can tell you that the LF3 is 10.2:1, as well as the LF4...

I know you were asking about LF4 rods, but I have a set of LF3 rods here. The LF3 rods are shorter than the LFX rods. I would imagine that the LF3 and LF4 rods are the same length. Doesn't really matter too much if you're going to have custom pistons made anyway.
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Old 10-01-2015, 07:41 PM   #5
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Quote:
Originally Posted by smithnc View Post
Ecoboost is 10.0:1 as well... you'd probably be good there or maybe 10.5:1.
Yeah I was thinking 10.5 might make more power and still be ok since we're DI. Especially if I end up adding a meth kit to it. But I'm not an expert and 10:1 might be the wiser choice.
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Fabberge turbo kit w/ Garrett GT28's -- 3" downpipes w/ 3" V-band wastegates -- Jacfab forged rods -- Diamond forged pistons(10.5:1) -- AEM boost controller -- Tial Q BOV -- CircleD 2E triple disc converter -- Tru-Cool 40k tranny cooler -- BMR suspension -- Pegasus aluminum rear cradle bushings -- Pfadt 1.25" springs -- ZL1 sway bars -- SS diff swap(3.27) w/ SS axles & hubs -- Brembo brakes -- Elite Engineering E2-X Ultra evac system -- ARK Performance DT-S Catback Exhaust
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Old 10-01-2015, 07:41 PM   #6
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Subscribed to this build! Good Luck!!
Thanks I need some luck!
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3.6L Twin Turbo V6
Fabberge turbo kit w/ Garrett GT28's -- 3" downpipes w/ 3" V-band wastegates -- Jacfab forged rods -- Diamond forged pistons(10.5:1) -- AEM boost controller -- Tial Q BOV -- CircleD 2E triple disc converter -- Tru-Cool 40k tranny cooler -- BMR suspension -- Pegasus aluminum rear cradle bushings -- Pfadt 1.25" springs -- ZL1 sway bars -- SS diff swap(3.27) w/ SS axles & hubs -- Brembo brakes -- Elite Engineering E2-X Ultra evac system -- ARK Performance DT-S Catback Exhaust
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Old 10-01-2015, 07:46 PM   #7
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I know your girlfriend probably doesn't approve of this... LOL!
Oh man, we're just not gonna tell her much. Just that the cars broken and i have to build a motor for it lol. I need to go ahead and do it while she's still the girlfriend and not the wife!
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3.6L Twin Turbo V6
Fabberge turbo kit w/ Garrett GT28's -- 3" downpipes w/ 3" V-band wastegates -- Jacfab forged rods -- Diamond forged pistons(10.5:1) -- AEM boost controller -- Tial Q BOV -- CircleD 2E triple disc converter -- Tru-Cool 40k tranny cooler -- BMR suspension -- Pegasus aluminum rear cradle bushings -- Pfadt 1.25" springs -- ZL1 sway bars -- SS diff swap(3.27) w/ SS axles & hubs -- Brembo brakes -- Elite Engineering E2-X Ultra evac system -- ARK Performance DT-S Catback Exhaust
12.123 @ 119.88

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Old 10-01-2015, 09:00 PM   #8
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She is going to kill you. But at least you would have a built motor. I wish you the best of luck. If you do well you can start a lfx forge shop
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