Supercharged VQ37 Goes BOOOM

Jordo!

Huh? The knock sensor has nothing to do with the MAF sensors. Actually, neither do any of the O2 sensors

Both take readings after the MAFs and after the SC.

Whether or not the ECU can go into limp mode fast enough is a race between knock sensor sensitvity, the rate at which detonation is happening, and factory tuning.

Obviously in this case, the ECU didn't respond.

Boost is really just a measure of restriction -- what matters is the volume of air entering, which may be greater (even if boost is lower) thanks to the headers. If the fueling was off, and in-cylinder temps got too high (the reason you want to run a little rich is to have unburt fuel cool off the combustion chamber), the fuel may ignite out of time (causing preignition and detonation), which results in a good deal of shock to moving components, and boom -- something may break.

Looks like it shot a rod out the side of the block

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Staples

I understand that they're not linked... you're right, but as I said before it still boils down to the tune and MAF position. You don't need the knock sensors to pull timing if there isn't any type of detonation present. What would have caused the detonation from the get-go? Fuel, tune, too high of cylinder temperatures because of the boost spike maybe.

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'08 Infiniti G37s - Forced Induction Fed

Jordo!

Although if anything, better flowing headers should have reduced boost while still running lean.

I'm more inclined to believe that if the same pulley was used, the boost gauge was just off if it was reading higher boost than anticipated.

Probably it was just flowing more air, and ran lean, pop goes the motor.

__________________
Enjoy it. Destroy it.

Staples

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'08 Infiniti G37s - Forced Induction Fed

1slow370

STFU about the MAF sensor placement draw through is the most accurate way to meter airflow in any setup unless a blowoff valve is venting or the bypass valve is routed improperly. the sensors in our cars cannot detect pressure above atmospheric so to go blow through you cannot compensate for boost pressure beyond setting the fuel trims to a safe envelope for what the "expected boost" the setup will make. Tell me how many oem blow through setups exist? oh none. blow through is used in cases where the volume of uncompressed air exceeds the MAF sensors maximum flow, or when an open BOV is used, OEM's go draw through because they are all recirculated to keep noise down, and they can design the MAF sensor around the setup because they are OEM. What may be important is mass airflow sensor SIZE if the stillen supercharger draws more air than the meters can support, then they would have needed to use larger diameter piping around the sensor and compensated for this in the ecu.

Either way I say detonation caused by bad fuel and ignition settings in the tune blowing the piston up, that or unrelated mechanical failure such as as a spun bearing causing the rod to blow and the piston got munched by the crank on the way out.

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