Need more Low end torque!
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This is a discussion on Need more Low end torque! within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Okay, so I recently installed a vf39 turbo in my 02 wrx along with 565cc pinks. I'm running the cobb ...

  1. #1
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    Need more Low end torque!

    Okay, so I recently installed a vf39 turbo in my 02 wrx along with 565cc pinks. I'm running the cobb 'stage 3' OTS map for the time being.

    First impressions:
    Car pulls much harder after 3800 rpm.
    Spool seems quicker than the td04.
    Pulls hard all the way up to redline.

    Issues:
    I go back and forth between two towns (about 90 miles) every few weeks.
    While driving this route I noticed the following after the installation of the above parts.

    Worse gas mileage (more than expected)
    Barely any low end torque while going up hill on the highway....
    In fact, the cruise control had a hard time keeping speed at times.

    What can I do to help gain back a little bit of low end around 2500 RPM since my turbo has virtually no spool at this point in the rpm range?

    Just for reference I'll list what's been done to the car already
    GS up pipe, Cobb downpipe, Sti top mount, sti pinks, vf39 turbo, M2 catback.

    Thanks
    02 WRX: Accessport, Cobb downpipe, GS up pipe, M2 catback, Sti top mount, 565cc Sti pinks, vf39 turbo. OTS stage 3 map. Estimated ~270whp

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  3. #2
    Registered User Monk_Knight's Avatar
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    Protune.

  4. #3
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    Will the difference in usable power really be that much better?
    02 WRX: Accessport, Cobb downpipe, GS up pipe, M2 catback, Sti top mount, 565cc Sti pinks, vf39 turbo. OTS stage 3 map. Estimated ~270whp

  5. #4
    Registered User Crazyced's Avatar
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    Where's your AFR at?
    2004 Subaru Impreza WRX
    2004 Dodge Neon SRT-4

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    11 at wot. Every cobb map I've used was that. And I'm pretty sure that's pretty rich by protune standards.
    02 WRX: Accessport, Cobb downpipe, GS up pipe, M2 catback, Sti top mount, 565cc Sti pinks, vf39 turbo. OTS stage 3 map. Estimated ~270whp

  7. #6
    Registered User Crazyced's Avatar
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    Quote Originally Posted by Sex_in_my_rex19 View Post
    11 at wot. Every cobb map I've used was that. And I'm pretty sure that's pretty rich by protune standards.
    But what about at part throttle were you say the car struggles (while on cruise, up hills, etc)?
    2004 Subaru Impreza WRX
    2004 Dodge Neon SRT-4

  8. #7
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    I didn't make a mental note of that unfortunately. I will look next time I'm driving!

    What would I want to see while at part throttle out of curiosity?
    02 WRX: Accessport, Cobb downpipe, GS up pipe, M2 catback, Sti top mount, 565cc Sti pinks, vf39 turbo. OTS stage 3 map. Estimated ~270whp

  9. #8
    ClubWRX.net Vendor WTF Tuning's Avatar
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    Quote Originally Posted by Sex_in_my_rex19
    11 at wot. Every cobb map I've used was that. And I'm pretty sure that's pretty rich by protune standards.
    Unless you have a WBO2, AFR readings @ WOT are meaningless. The OE sensor doesn't read below 11-11.2:1, so it can be anything.

    There are a lot of things you can do to increase low-end torque, one of which being a custom tune. Additional parts could help, as well, when paired with a tune. It all depends on what your budget is.

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