Wind up the Boost for you turbo car for around 50 Cents !!
(for integral wastegate turbo systems)
There are many ways of 'upping
the boost' on a turbo car.
The test vehicle is a starion
turbo...now before you all complain about
The principal of the wastegate
is to open an exhaust bypass of the turbo in the turbo/exhaust housing
at a preset boost level to stop the boost rising any further (In this case
it was opening at around 5 pounds).
Inside this activator is
a spring and a diaphragm. The spring preloads the rod that operates the
wastegate keeping it closed. the diaphragm sits on top of the spring. A
Boost line is feed into the top of the activator on top of the diaphragm,
and when the boost is greater than the spring pressure the wastegate opens
and the boost pressure stops increasing.
Now the bleed of method works
by bleeding off a bit of the boost from the line to the wastegate activator.
thereby fooling the wastegate into seeing a lower boost pressure than the
motor is actually making....a very popular way of 'upping the boost'....But
I found with the amount of bleed off needed to increase the boost to the
targeted 14 pound there was a noticeable movement of the power band back
up to where it was with the standard mitsubishi turbo....another 1000 rpm
back UP the rev range
So back to my solution, the way I ended up doing it was with some inexpensive springs....that's right ordinary springs from the hardware store...stretched across the wastegate increasing the spring preload tension on the wastegate.
By adding the extra springs
to the outside of the wastegate you increase the preload on the wastegate....thereby
needing a higher boost pressure level to overcome the extra spring preload,
thereby increasing your boost!
this at your own risk...we take no responsibility for your actions. START
SMALL and LISTEN to the motor under boost for pinging (a sign of detonation)...SEEK
ADVICE as to how much of a boost increase your motor can handle. Different
factory motors can handle different increases in boost before leaning out
(starving of fuel)
I cannot over stress the
above warning...so I will risk repeating myself...
above are just my/our views and we welcome your feedback.