[ISTA] Bang at high boost - help!

[Aaron Klinger <klingers@earthlink.net>]

Since Mark works 17 hours a day, (and because I'm stumped) I'm emailing
his problem to the list. He doesn't check his mail much, so just email
me - I'll be the one fixing it anyway. :-)

The other night he was driving home from work at 4am, jumped on it, the
stock boost gauge pegged (15+, but not abnormal), and it made a loud
Bang/Pop sound, fell on it's face, all-but stalled, but recovered and
drove fine after that - no codes, no limp-home mode. He put my old
Hypertech chip in (I never had problems with it) a few months ago, and
he has an 8" cone, Walboro 255L pump, and ATR exhaust - all on for at
least 2 months with no problems. Well, when I checked it the next day I
found a nice chunk out of the upper rad hose (alternator fan bit it),
and the radiator was quite dry - oops. So I thought the popping sound
was the radiator hose blowing out. I swapped mine onto it (I don't need
one right away!), filled it with AF, and took it out. Did to me what it
did to him. Only had a problem at max boost. I thought maybe it was
overboosting with the cone/exhaust/chip combo, so I cranked the
wastegate a turn and a half and went back out. Spooled slower (go
figure), maxed around 13psi (stock gauge), still banged at max. Still no
codes. Hmmm...

It almost feels like a fuel cut-off, but it shouldn't bang. My two
(ignorant) guesses - 1) turbo screwed from lack of AF (unlikely, but
possible. 2) stock FPR on the fritz/can't handle the Walboro pump and
15+psi. However, I'm just guessing - never had anything like this
before. Haven't been able to check FP - what should I expect? BTW -
truck has 93k, and I think it's the original FPR. Turbo was replaced at
dealer by previous owner 10k ago.

Any ideas? TIA

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Aaron Klinger
Reading, PA  "House of Typhoons"
SyTy Wearables headquarters
Northeastern Caravan Coordinator for SyTyNationals
ISTA Mid-Atlantic Region host: http://home.earthlink.net/~klingers
klingers@earthlink.net