Mazdaspeed Forums - Did Mazda beef up the rods in 2010-13 speed 3s?

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BMC	01-25-2016 09:11 AM

Did Mazda beef up the rods in 2010-13 speed 3s?

I'm looking hard at a BNR S4 but can't afford both that and swapping out the rods. I seem to be seeing more cases of guys running over 400whp and comparable torque (and no boom boom), without going to an after market set of rods. That said, I was wondering if by some slim chance Mazda might have strengthened them on their later models of the speed3. My goals are a bit over the 400 mark. Thanks.

mize13

01-25-2016 09:20 AM

Tuners and the community now know to bring on boost gradually and/or later rather than spooling to large pressures quickly/early down low. Large boost pressures and too much timing down low translate to more stress on the rods. It's all about managing torque down low.

Some of the issues now are large thermal concentrations (too much heat) at the ringlands at higher power levels for stock pistons, and running out of fueling. You can combat the heat issue by running E to get better in-cylinder cooling, but you'll eat up IDC headroom. You can combat running out of fuel by running WMI or port injection.

BMC	01-25-2016 09:28 AM

Quote:

Originally Posted by mize13 (Post 3015593)

Tuners and the community now know to bring on boost later rather than spooling to large pressures quickly/early down low. Large boost pressures down low translate to more stress on the rods as opposed to the same boost pressures up top. It's all about managing torque down low.

Some of the issues now are thermal concentrations (too much heat) at the ringlands at higher power levels for stock pistons, and running out of fueling. You can combat the heat issue by running E to get better in-cylinder cooling, but you'll eat up IDC headroom. You can combat running out of fuel by running WMI or port injection.

So the community is getting better not Mazda! Still best then to do the rods (and by that I mean rods and pistons) if going slightly over 400?

MS3Shadow

01-25-2016 09:28 AM

Adding Meth does help was well.

sent from my Nexus 6P

BMC	01-25-2016 10:01 AM

Quote:

Originally Posted by MS3Shadow (Post 3015602)

Adding Meth does help was well.

sent from my Nexus 6P

I'm currently running 2 gal. of in-tank-meth, in part for the cooling but mostly because of the lousy 91 octane available here.

blackms3_71

01-25-2016 11:32 AM

I dont thunk in tank meth plays a part in cooling. I could be wrong.

mize13

01-25-2016 11:45 AM

Quote:

Originally Posted by blackms3_71 (Post 3015688)

I dont thunk in tank meth plays a part in cooling. I could be wrong.

It does for in-cylinder cooling.

Latent heat of vaporization for methanol: 1103 kJ/kg
Latent heat of vaporization for ethanol: 840 kJ/jg
Latent heat of vaporization for gasoline: 350 kJ/kg

sheston

01-25-2016 06:21 PM

Just to try and answer the original question. Did mazda improve the rods? I don't think so. I bent one with not much hp, albeit partial throttle at low rpm in 6th.... should have known better.

Tuning can make them survive, but you may not be totally happy with the power output

I run Meth in tank (2 gallons) and it is almost impossible to knock. I also spray a D07. I'm sure they both help the engine survive by overall cooling and knock protection

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