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Thread: Hybrid Turbo idea...

  1. #1
    Join Date
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    Default Hybrid Turbo idea...

    So i got to thinking a little about building a turbo car (not going to happen for a while, just thinking). I love my hybrid, and thought of making a high CR turbo engine. I could get the forged internals for a 3L and run the 2.5 Cougar heads that i have now with some bigger valves. It'd drop the CR to below 11:1.

    Has anyone thought of doing this? I know some of the crazy turbo 4 bangers run 10:1 CR or better, and i have a friend with a 97 Cobra that is built to 11:1 CR and runs 8lbs on a street tune, and over 15 on a track tune.

    What are your thoughts?
    00 Contour SVT #1914 BLK/PT 2.5 Full bolt on/torsen
    00 SVT Contour # 0889
    98 Contour SVT #2147 Silfro/mnb. Former ElKy car! Sold
    00 Contour SVT #0157 BLK/PT parted out
    95 Mystique GS

  2. #2

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    High compression limits HP on a turbo. Unless you have direct injection into the cylinder head it is a recipe for disaster. Lower compression = more boost options, and far more HP. It is the boost that wakes an engine up, not the static compression ratio.
    Don Higgins
    Crew Chief Pro Drag Racing Software
    http://www.crewchiefpro.com
    1999 3.0 Turbo CSVT ** 2013 American Dragster with 1100 Horsepower 7.28 @ 185 mph

  3. #3

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    Exactly. Play around with a dynamic CR calculator and youll see why raising cr on a boosted motor is redundant, and dangerous.

  4. #4
    Join Date
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    Default

    It can be done to some extent if the vehicle is run on ethanol...
    -Mike
    If you are wondering where the avatar came from look here... Link
    98 SVT Contour - HoK TruBlue|CF roof|#49/6535 DOB 3/25/97|550whp here I come|Follow my extremely slow 3L/turbo build here Link
    85 Camaro - 1969 350ci, 503BHP

    Owner - RIES PEFORMANCE

  5. #5

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    Mod motors dont like low comp and boost for some reason thats why most of those guys dont drop comp ratio they leave them closer to stock ratio. Thats the sweet spot for those motors.

    But main problem is when trying to run a higher comp ratio is you will end up running non pump gas fuel
    and crazy amounts of timing. To get it to not detonate.
    99 svt contour #0469
    87 merkur xr4ti awaiting v8 swap and solid axle

  6. #6
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    Default

    Doable for sure. Some do this deliberately as higher compression will help spool a turbo more quickly. You'll also have more power off boost and be able to put down more power with less boost. However you'll have less margin for error. Would I do it for this platform? Absolutely not. Lag really isn't an issue on a 3L V6 unless you're running a huge turbo, and since you're using aftermarket pistons anyways I don't see the point.
    Sold- 98.5 Silver Frost #5979
    Officially a troll. 2002 Suzuka Blue Honda S2000 on Works

  7. #7
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    I cant remember the who has it, but isnt there a hybrid turbo running around?

    IIRC someone from the Columbus OH area sold it a couple years ago and the new owner lives in AZ........the black car with morettes
    98 T Red SVT-Build # 1147
    2004 325XiT Wagon
    2012 VW CC Lux

  8. #8
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    Quote Originally Posted by imnotacop420 View Post
    I cant remember the who has it, but isnt there a hybrid turbo running around?

    IIRC someone from the Columbus OH area sold it a couple years ago and the new owner lives in AZ........the black car with morettes
    This car?? I always loved the look on it... well except for the front bumper riding up onto the fenders.

    -Mike
    If you are wondering where the avatar came from look here... Link
    98 SVT Contour - HoK TruBlue|CF roof|#49/6535 DOB 3/25/97|550whp here I come|Follow my extremely slow 3L/turbo build here Link
    85 Camaro - 1969 350ci, 503BHP

    Owner - RIES PEFORMANCE

  9. #9
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    Quote Originally Posted by CSVT#49 View Post
    This car?? I always loved the look on it... well except for the front bumper riding up onto the fenders.
    yep, thats the one
    98 T Red SVT-Build # 1147
    2004 325XiT Wagon
    2012 VW CC Lux

  10. #10
    Join Date
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    Quote Originally Posted by imnotacop420 View Post
    yep, thats the one
    http://www.contour.org/ceg-vb/showth...light=Qwk98svt
    98 T Red SVT-Build # 1147
    2004 325XiT Wagon
    2012 VW CC Lux

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