Speed Week 2007 at Bonneville Speedway
(Click here for Bonneville Speedweek 2006 info)
(Click here for Bonneville Speedweek 2008 info)
Final results for the Stude' this year:
211mph with 2 cylinders acting up-- valvetrain issues. The back two
cylinders on the drivers side of the motor had been suspect all week,
burning significantly richer than the rest as the story was told by
reading the plugs. Boost (with the wastegates wide open) last year
was at 12psi, and this year was at 18-20psi, there were no intentional
changes to the motor to make this happen... this was suspect as well.
I'm not there for the motor teardown, but my suspicion is those two
cylinders weren't flowing air properly as evidenced by their burning
richer than the rest. Less flow through the engine would also
cause more pressure to build up in the intake causing boost to climb
higher than expected just as we saw.
We also had some grounding issues with the
car that we sorted out (block was not grounded directly to the battery),
though the inadequate grounding appeared to have damaged the 5v
regulator in the MS so I dropped a spare
MS1 v3.57 EMS in the
car which got us back in the action.... At least enough to get back to
the valvetrain issues. Turns out one of those two cylinders
finally game up the ghost on day 4. We dropped an exhaust valve on
the 211mph run and holed a piston. Oh well.... as they
say... "that's racing".
The Buick set 2 records in classes in the 135-142mph range. They were
going back for a 3rd the day I left.
David Freiburger's car (Hotrod Special) had set 2 records when I left
and was going back for a 3rd as well.
Tons of pictures below-- be sure to check
them out (and click for a bigger view):
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