VF 39, VF 43, CobbAp v3
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This is a discussion on VF 39, VF 43, CobbAp v3 within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Will VF 43 turbo fit my 04WRX? I want the V43 because its has a slightly larger wastegate and will ...

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    VF 39, VF 43, CobbAp v3

    Will VF 43 turbo fit my 04WRX? I want the V43 because its has a slightly larger wastegate and will reduce turbo creep. Also, COBB AP stage Maps are for the VF39, will this matter for the tuning?? Well i mean the both turbos are kind of identical from what Ive heard.

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    Quote Originally Posted by Susanoo View Post
    Will VF 43 turbo fit my 04WRX? I want the V43 because its has a slightly larger wastegate and will reduce turbo creep. Also, COBB AP stage Maps are for the VF39, will this matter for the tuning?? Well i mean the both turbos are kind of identical from what Ive heard.

    You're not going to have any issues with boost creep on a 2L engine.. it doesn't move enough air to overrun the IWG.


    I wouldn't even use the Cobb OTS map on a vf39, trying to use it on a different turbo would be bad news. Kind of identical and actually identical are not the same thing. I haven't gone over the detailed specifics of each turbo, but they're not the same at all.. you already said the IWG is slightly larger, which would mean the WGDC values for the vf39 would be all wrong right off the bat.. not to mention the compressor wheels and compressor/turbine housings are different.

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