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Old 11-16-2016, 05:07 PM   #1
Dave D.
NASIOC Supporter
Member#: 130990
Join Date: Nov 2006
Chapter/Region: NWIC
Location: Menzel Lake, WA
06 Red Ltd.Wagon
20g-xtr jdm 6-spd JJtuned

Default Motor Refresh, a few more hp

I won't trouble you with the ordeal (this started way back in March), but in the end, due to a spark plug that cracked -- after about 10,000 miles too many on my built motor -- the eventuality was my valves, turbocharger, and JDM pistons got pinged up pretty good.

Fortunately the SB was okay -- new pistons (coated this time), all new inconel valves (the old ones were a hodge-podge), and a new turbo cartridge, and a new Clutch Masters FX300 clutch, John at Infront got my car back onto the dyno. Since my last tune, Infront has switched fro a Dynocom to a Mainline.

The resultant numbers were relatively lower at about 340whp/310tq, but the graph looks much the same shapewise. I asked him about relative figures and he told me it would be around 390 Mustang dyno hp or 440hp on the original Dynocom at the shop. With the new, better-flowing and cooler valves and the heat resistance of the coated pistons it stands to reason I would have picked up another 15whp compared to my original Dynocom figures.

A shorter interval on the spark plug changes would likely had avoided all this trouble (they had nearly 30k).

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