04-04-2019, 11:03 PM
(This post was last modified: 02-05-2019, 11:10 PM by weka.
Edit Reason: more boost test results
)
Hi, I'm not as experienced as most on this forum, I have a 1999 306 1.9td but play around with older XUD7 and XUD9 in my 405's.
Reading these forums a bit, one area worthy of attention seems to be the wastegate adjustment.
The Garrets have an adjustable length shaft, the KKK has a screw in the middle.
I would guess that if you are increasing fuel, you would want to ensure the wastegate is not 'creeping' or opening too soon.
I dont know the best test conditions for boost pressures, would it be accellerating in 3rd or 4th gear perhaps?
Edit: Travelled over a pass on the weekend.
Holding 3rd gear on a a hill with the foot down and my guage started flicking at 16psi which will be the wastegate. Will try to increase this.
My guage is industrial type with 23psi full scale, so believable.
Later Edit:
Travelled over a different pass with many slow inclines towing a trailerload and it was great to see the turbo boost being used heavily even at lower rpms with moderate pedal.
Didn't seem to use more diesel than my usual faster driving with no load/less boost.
With an unloaded car, it requires flooring the pedal and higher revs to get the boost pressure to climb.
I found it interesting you adjust the timing by the belt, rather than the pump mounts, but I guess it makes sense as the pump is running at half engine speed so in engine degrees that would be half the number of pump teeth divided by 360.
No movement on the delivery pipes to think of but acess to the belt adjuster required?
On the subject of turbos, I read yesterday that the later 1.6 turbo diesels have a high horsaepower version using a garret turbo with special wastegate features. I haven't found the details yet. (Computer control related?)
The alternative low hp version uses a mitsubishi turbo (wiki)
Reading these forums a bit, one area worthy of attention seems to be the wastegate adjustment.
The Garrets have an adjustable length shaft, the KKK has a screw in the middle.
I would guess that if you are increasing fuel, you would want to ensure the wastegate is not 'creeping' or opening too soon.
I dont know the best test conditions for boost pressures, would it be accellerating in 3rd or 4th gear perhaps?
Edit: Travelled over a pass on the weekend.
Holding 3rd gear on a a hill with the foot down and my guage started flicking at 16psi which will be the wastegate. Will try to increase this.
My guage is industrial type with 23psi full scale, so believable.
Later Edit:
Travelled over a different pass with many slow inclines towing a trailerload and it was great to see the turbo boost being used heavily even at lower rpms with moderate pedal.
Didn't seem to use more diesel than my usual faster driving with no load/less boost.
With an unloaded car, it requires flooring the pedal and higher revs to get the boost pressure to climb.
I found it interesting you adjust the timing by the belt, rather than the pump mounts, but I guess it makes sense as the pump is running at half engine speed so in engine degrees that would be half the number of pump teeth divided by 360.
No movement on the delivery pipes to think of but acess to the belt adjuster required?
On the subject of turbos, I read yesterday that the later 1.6 turbo diesels have a high horsaepower version using a garret turbo with special wastegate features. I haven't found the details yet. (Computer control related?)
The alternative low hp version uses a mitsubishi turbo (wiki)