Low Boost 03 Cobra???
- Thread starter xtreme02stang
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wmburns
SN Certified Technician
What are the results of a compression test? What is the base condition of the motor? Any vacuum leaks? What about the exhaust system? A blocked/restricted exhaust will raise boost.
FWIIW, there is a possibility that you are missing the mark if focusing too much on the amount of boost. Isn't this about making HP?
There are tons of reasons why one motor makes more boost than another. Differences in stock cam timing being very near the top of the list. In fact, it may not be a bad thing to have less boost.
Sacrilegious you say?
Take two motors. One flows better than the other. All other things being equal, the better flowing motor will have LOWER boost and will most likely make more HP. Boost is partially the by product of the resistance to the flow of air.
Check out the KB WEB site. There are several tech articles talking about boost and why one motor could make more/less than another.
If you still want more boost, try crimping the exhaust. The extra exhaust back pressure will raise the boost level showing on the guage. However, I doubt if the over all results will please (note this is an attempt to make a point).
FWIIW, there is a possibility that you are missing the mark if focusing too much on the amount of boost. Isn't this about making HP?
There are tons of reasons why one motor makes more boost than another. Differences in stock cam timing being very near the top of the list. In fact, it may not be a bad thing to have less boost.
Sacrilegious you say?
Take two motors. One flows better than the other. All other things being equal, the better flowing motor will have LOWER boost and will most likely make more HP. Boost is partially the by product of the resistance to the flow of air.
Check out the KB WEB site. There are several tech articles talking about boost and why one motor could make more/less than another.
If you still want more boost, try crimping the exhaust. The extra exhaust back pressure will raise the boost level showing on the guage. However, I doubt if the over all results will please (note this is an attempt to make a point).
Three50won
10 Year Member
- Jul 11, 2010
- 1,135
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+1 on wmburns comment...also check the size of the crank pulley, it might be smaller than stock in which case you'll have less boost. Maybe the previous owner had a bigger supercharger on it and altered both pulleys for a specific boost/hp amount to tune it properly and prevent belt slippage.
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