720driver97 Posted August 27, 2015 Author Report Share Posted August 27, 2015 OK thanks for your input I didn't know much about the 12a Quote Link to comment
datzenmike Posted August 27, 2015 Report Share Posted August 27, 2015 Look on the inner pass side fender under the hood hinge. There's a small plate with info on it. In the lower right corner it will say HF35 or HF37 or HF38 or ??? what does yours say??? Quote Link to comment
720driver97 Posted August 27, 2015 Author Report Share Posted August 27, 2015 Hf38 if I remember right Quote Link to comment
datzenmike Posted August 27, 2015 Report Share Posted August 27, 2015 For $50-$100 you could get a 4.11 or 4.375. I just went from 3.7 to 4.11 in my car the the difference is nothing short of amazing. You get to keep the engine stock but the added gear ratio allows you to rev faster. Brings the gear changes closer together. Quote Link to comment
720driver97 Posted August 29, 2015 Author Report Share Posted August 29, 2015 Ya I swaped gears in my f150 from 3.55 to 4.11 I was amazed at the difference Quote Link to comment
720driver97 Posted August 31, 2015 Author Report Share Posted August 31, 2015 is there a way to get the turbo to spool up quicker at low rpms Quote Link to comment
datzenmike Posted August 31, 2015 Report Share Posted August 31, 2015 Requires more exhaust or get a smaller turbo. Quote Link to comment
Lockleaf Posted August 31, 2015 Report Share Posted August 31, 2015 Manifold shape can affect this. Smaller exhaust manifold volume will spool faster, usually at the expense of peak boost pressure, because small manifolds are not optimal shapes. Factory cast style manifolds will spool faster than equal length ram horn tubular manifolds. Quote Link to comment
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