It's because the turbo spools so fast. If you go wot at 2k you can hit 18psi by 2500. which is too much stress on the stock rods. My situation was different as my avatar shows.
I had a fuel pump problem which lead me to run lean....you can see the rest lol
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08 Mazdaspeed 3
Eibach Pro Kit, AEM CAI, Midevil TIP, Custom CBE, Custom Midpipe with E-cutout, Corksport DP, PTP Fuel Pump Internals, Cobb AP, HKS v2 bov, JBR SSP, step 1 colder denso plugs, tune on 18psi....301whp 338 wtq.
Rebuilt Engine, Pauter rods, CP pistions with .020 overbore, ARP main and head studs, Cosmetic Headgasket, SD/cpe injector seals, ACT 6 puck sprung Clutch and lightweight flywheel, FMIC, RMM, Tranny Mount, gound wireing kit. soon to come - koni yellows, retune....
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