Thread: 300tdi towing

Boost should come in a lot earlier with the compensator adjustment.

I hate to say it but you need a James Bond like cloud of smoke just past idle to get that old turbine spinning.
It looks awful to an outsider (or the EPA ) but it works.
The real fix is a more efficient turbo, eg. the TD04 or the Garrett from the TD5, a VNT or a compound setup.

Thanks rick
Do u mean compensator adjustment as in star wheel ?

Also what is a td04 turbo, and where do I get one ?

Oz

Originally Posted by oztrax

I agree
I have boost range where I want it ATM
Eg 2500 5psi 3000 7-8psi
For accel towing boat and around town

Need more top end boost, fairly sure I shortened waste gate
Rod to get boost happening down lower, but have lost the top end
Which was 13 psi ish from memory

Considering external boost control to control the range better

Oz

Your boost is.unde, by Niles.

Those numbers are my.economical cruise numbers emptyish.

Stock they run from 15-17psi at full noise.

There is a reason why I have a 35 psi gauge and. It's not because I'm worried about what's goin on down in the 8-9psi range of boost pressure.

You'll also want to upgrade the exhausting if you want to use anything more than what the stock turbo can make, as is I'm pushing the limits of the td04 and have a set of custom wheels in it to get where I'm at, I'm only adding the charge air/coolant intercooler to.give me a bit more breathing room on the rate of climb for the egt.

Feel m what your describing you've got at least two of.your settings pooched up and. It doesn't want to play for you.

Shortening the wastegate should.give you more top end and make.very little.difference.downthe bottom end because you shouldn't have the hhas flow rate to work the turbine hard enough.

This is fairly typical if you've got low spring pressure on the compensators spring with the plunger cam set shallow. You'll get a good initial response bit run out at the top. The start point screw might also be set too shallow. But if you didn't mess with that it's unlikely.


If your current setup can't give you 15-17psi of boost from 2500 in third then something, somewhere, is wrong.

The td04 is a Mitsubishi turbo, you can get them online, the problem is the manifold.

It's not that much better then the stock turbo but it's water cooled which is it's key advantage over the rover turbo.

I have to play cautious with what I put up here in terms of what mods and exactly how it's done as some.of my tweaks have an adverse effect on engine longevity of you don't drove it was xactlt right and while the better operators amongst us would suffer no Ill effect the Muppet steered who does all the tweaking then hauls a 4 ton trailer up the range in fifth is the lowest denomination that I have to be mindful of.

More than happy if we can get into the same location at some point to give you some.hands on help.

Also happy for you to get in touch via pm email and phone so I can get some better ideas on what's going on under your hood and point you a little more clearly.

Sorry to hijack the thread...

I'm just reading over this, and it's been mentioned couple of times.Something like this: "Shorten the wastegate actuator to make boost happening earlier" Since when does wastegate has anything to do with turbo boulding boost up faster? If so, can someone explain to me how?
Only thing that it can be is that wastegate is not shut properly.

Thanx

Originally Posted by ROAMER_AUS

Sorry to hijack the thread...

I'm just reading over this, and it's been mentioned couple of times.Something like this: "Shorten the wastegate actuator to make boost happening earlier" Since when does wastegate has anything to do with turbo boulding boost up faster? If so, can someone explain to me how?
Only thing that it can be is that wastegate is not shut properly.

Thanx

The wastegate has two forces operating on it the exhaust pressure and the boost pressure from the inlet side against the spring pressure. The first two combine to try and open the wastegate while the spring tried to hold it closed.

As it's not an on/off configuration as the boost pressure rises and the exhaust pressure.comes up the waste gate begins to open. This slows down the response of the turbo down low as some of the exhaust gas begins to bypass the turbine.

Upping the spring pressure by shortening the rod makes this happen further up the boost curve. Wind it in hard enough and your boost pressure becomes a function of the limits of the injector pump or right boot control up u til you hit the poi t where the design limits of the compressor/turbine wheels are exceeded and you wind up slipping the compressor and overspeeding the turbo killing the bearings or running the turbine ina " stall " condition and eroding its blades reducing the effeciency and operation of the turbo making it more and more prone to "stalling"

Originally Posted by Blknight.aus

The wastegate has two forces operating on it the exhaust pressure and the boost pressure from the inlet side against the spring pressure. The first two combine to try and open the wastegate while the spring tried to hold it closed.

As it's not an on/off configuration as the boost pressure rises and the exhaust pressure.comes up the waste gate begins to open. This slows down the response of the turbo down low as some of the exhaust gas begins to bypass the turbine.

Upping the spring pressure by shortening the rod makes this happen further up the boost curve. Wind it in hard enough and your boost pressure becomes a function of the limits of the injector pump or right boot control up u til you hit the poi t where the design limits of the compressor/turbine wheels are exceeded and you wind up slipping the compressor and overspeeding the turbo killing the bearings or running the turbine ina " stall " condition and eroding its blades reducing the effeciency and operation of the turbo making it more and more prone to "stalling"

You are correct in your description, but that won't make boost come on any earlier. If your tdi starts making boost at 1800 rpm for example, you can shorten your wastegate rod as much as you want, engine will still start to get boost at 1800 rpm.

Originally Posted by ROAMER_AUS

You are correct in your description, but that won't make boost come on any earlier. If your tdi starts making boost at 1800 rpm for example, you can shorten your wastegate rod as much as you want, engine will still start to get boost at 1800 rpm.

Not quite.


The question answered was "Since when does wastegate has anything to do with turbo boulding boost up faster? If so, can someone explain to me how?"

If it normally starts to open at about say 5 psi of boost then you start loosing exhaust manifold manifold pressure which means that the boost will come on slower. If you shorten the rod and up the spring pressure so that it doesn't start to move until 10 psi then therese no loss of exhaust manifold pressure until after 10.psi so the pressure rise will be sharper at the bottom end.