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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Boost problems with blown holden 186
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Fri, 23 September 2005 09:05
 
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lets do some math.
SC14, overdriven 78%
178% of 1.4L = 2.49L
for each engine rev, you push 2.49L
engine is 3.2L = 1.6L per rev.
2.49/1.6 = 1.556 = 8psi boost
so at ANY rpm, you should only be making 8psi.. assuming that air gets into the motor  if the head/motor is restrictive, you will see higher boost (ie measure of air not getting in.
SC14 maximum revs = 14000, so you should be able to rev to 7500 easily without overspinning the SC.
what cam is it (overlap/duration) maybe your cam is allowing boost to blow out the exhaust, so you are not making as much as you should?
it should give a steady 8psi all the way until it starts to overheat the air..
do you have an IC? hot air = bad.
belt could be slipping but could also be a timing issue, fueling issue etc etc.. how much belt wraparound is there on the pulleys?
air leaks??
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