300 tdi boost pressure

cragmaz · Aug 15, 2010

Hi all,
Just a quick one, what boost pressure should a std 300 tdi run?
Also, how much CAN it run safely???
Thanks
C.

CharlesY · Aug 15, 2010

cragmaz said:
Hi all,
Just a quick one, what boost pressure should a std 300 tdi run?
Also, how much CAN it run safely???
Thanks
C.

About 1.5 BAR is tops, and usually it will run about 1.1 BAR with full throttle and the revs anywhere over about 2,000 rpm.

the more AIR you can stuff in the more efficiently it runs, and the power will go up a little but only on full throttle of course.

Oh yes ... if you over-boost it the head gasket might blow, or worse like this guy did with SEVEN BAR boost.

If you look at Pic 2 you can see the whole cylinder block has been ripped apart.

CharlesY

davek0974 · Aug 16, 2010

CharlesY said:
Oh yes ... if you over-boost it the head gasket might blow, or worse like this guy did with SEVEN BAR boost.

If you look at Pic 2 you can see the whole cylinder block has been ripped apart.

CharlesY

Man, what a waste, I hate tractor pullin'

cragmaz · Aug 16, 2010

CharlesY said:
About 1.5 BAR is tops, and usually it will run about 1.1 BAR with full throttle and the revs anywhere over about 2,000 rpm.

the more AIR you can stuff in the more efficiently it runs, and the power will go up a little but only on full throttle of course.

Oh yes ... if you over-boost it the head gasket might blow, or worse like this guy did with SEVEN BAR boost.

If you look at Pic 2 you can see the whole cylinder block has been ripped apart.

CharlesY

Thanks Mate, will go for around 20psi then, its 16 now with my boost guage.
c.

CharlesY · Aug 18, 2010

cragmaz said:
Thanks Mate, will go for around 20psi then, its 16 now with my boost guage.
c.

Good plan.
It should be fine at 20psi, and it may not go more than that anyway.

Under a heavy load (three-ton trailer up a hill) you may notice a reduced tendency to trail black smoke because the extra air will assist combustion.

Enjoy.

CharlesY

bmp42 · Aug 18, 2010

one easy way of gaining a bit of boost is to resite the pressure take off for the wastegate, standard pressure is taken from the outlet elbow of the turbo this does not take into account any drop off of pressure within the intercooler/hoses ect, so drill and tap the inlet manifold and run that pipe to the 3 way joint(block of the original hole) - will now give the true bost pressure of the inlet manifold.

CharlesY · Aug 19, 2010

bmp42 said:
one easy way of gaining a bit of boost is to resite the pressure take off for the wastegate, standard pressure is taken from the outlet elbow of the turbo this does not take into account any drop off of pressure within the intercooler/hoses ect, so drill and tap the inlet manifold and run that pipe to the 3 way joint(block of the original hole) - will now give the true bost pressure of the inlet manifold.

That is very good advice, and can make a BIG difference, partly because of what he says, but also because the pressure in the inlet manifold is lower because all the air is going down to the cylinders.

Take care with Disco TD5 - this plan may not work as well due to the way the ECU controls boost pressure.

CharlesY

300 tdi boost pressure

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