Just wondering if an upgraded fuel pump is needed on an 2014 Evo X MR with bolt ons and 91? Looking to get around 330awhp. Heard they lean out at the top end because it overheats.

 

It's not really needed. I haven't seen too many people make over 320s on the sst with just bolt ons. Maybe on a dynojet. When I had my x se, I had all the basic bolt ons, tuned on 91 and only made 301whp. That was on a mustang.

 

I'll agree with above, you might make around 330 on a generous dyno jet with bolt-on MR on 91...but not on a Mustang dyno. Fuel pump isn't really needed until you mod bigger than bolt-ons.

For a comparison, my GSR has all the bolt-ons and a fuel pump (going to turbo soon), and I am at 316whp on the CBRD Mustang dyno, 93 octane. MR generally read a little lower due to the drivetrain.

 

Just bolt ons here: just the AMS STX400 kit but stock cat back. Cross 300 awtq at 3000 RPM, 332awtq at 3900RPM MR SST. No fuel pump needed. I'm on 93 octane.

 

stock pump is fine-

cb