Fixing the overboost issues with the MN 2.5HP

[alian]

Oh, ok

[Redneck198033]

Hot topic, I'm taking my rig to Berrima Diesel to see if I can do anything.

If its as simple as just getting a 2.5 inch dump pipe, I might have to do this.

[biggibbo]

I couldn't get mine over 18 psi last weekend. NFI why.

Dirty MAP sensor??

[Cowboy Dave]

Maybe. I suppose I could pop the bonnet and suss it out. But then I might glimpse at the coolant levels and that gives me the heebie jeebies these days.

[Redneck198033]

Has anyone else got a complete roo system fitted ??

I have the custom chip & 3" Genie Exhaust From dump pipe to tail.

Only a few days to go before Berrima diesel have a look.

[ag9111]

Has anyone else got a complete roo system fitted ??

I have the custom chip & 3" Genie Exhaust From dump pipe to tail.

Only a few days to go before Berrima diesel have a look.

Yep.
No problems so far.
Custom chip and 3" system. It was on the vehicle when I purchased it.

[biggibbo]

Maybe. I suppose I could pop the bonnet and suss it out. But then I might glimpse at the coolant levels and that gives me the heebie jeebies these days.

At least yours is still under warranty. Mines long gone, and not looking forward to that $10k Bill

[har05l]

Maybe. I suppose I could pop the bonnet and suss it out. But then I might glimpse at the coolant levels and that gives me the heebie jeebies these days.

At least yours is still under warranty. Mines long gone, and not looking forward to that $10k Bill

Engine conversion mate forget the 2.5

[ag9111]

3.2 out of a Pajero is what I would do. I would think that would be the easiest conversion, especially if you pick up a wreck

[biggibbo]

Don't get me wrong. It hasn't gone bang yet, but with 250,000 it is only a matter of time given the casting problem. Can't believe it's still going tbh. Mind you every other component excepting the donk has been replaced over the last 5 yrs

When it does go, I would say an ML 3.2 conversion is on the cards. Just need somebody to work it through first and figure out the engine mounts and gearbox plates etc.

[ag9111]

Just planning ahead

[ag9111]

Even the youngest 3.2 ML's are over 6 years old and you would have to get the MN ECU reprogrammed to run with the ASTC and the 3.2
A Pajero ECU is already programmed for the ASTC and the engine. Just transplant the wiring harness. You just have to get the wiring right but "should" pretty much plug straight in.
From memory yours is a manual so an ML 3.2 manual bellhousing "should" fit between your gearbox and the Pajero 3.2. You may even be able to use standard engine mounts.
Using the word should loosely as I have not looked into it. just given it some thought.

Not that I'm concerned or anything. Especially after what happened to Trevor

[RHKTriton]

Do the 3.2s in the triton and pajero use the same head?

[Redneck198033]

Has anyone else got a complete roo system fitted ??

I have the custom chip & 3" Genie Exhaust From dump pipe to tail.

Only a few days to go before Berrima diesel have a look.

Yep.
No problems so far.
Custom chip and 3" system. It was on the vehicle when I purchased it.

So do you do any heavy towing eg 1.5tonne & over?

I have no real issues before towing last October long weekend, the exhaust could of fitted better though.

[ag9111]

I regularly tow up to about a tonne with no issues.
no big hills though

[Redneck198033]

For people who are having the over boost issues, where are your catalytic converters mounted on the exhaust.

I have been talking to Genie the manufacture of my exhaust & they stat that the cat for a triton should be mounted in the exact place the original came from so close to the turbo.

This is meant to stop the over boost issue.

Mine is under the drivers seat.


I did ask why they build the system for Roo Systems this way, they are just building them as per the customer’s request( roo system's request), and so it looks like roo systems are not helping here.
The reason for the cat being put back further is to give lower EGT's as the hot gas will exit the dump pipe where the EGT probe is with minimal restriction till it gets to the cat under the car, so this will simulate a lower EGT.

So I have another dump pipe coming from Genie with cat in the dump pipe, I hope this fixes the issue.

EGT’s will show higher, but with a high flow 200 cell cat It will still take longer to get to the extreme heats.

I’ll keep you all posted.

CHEERS

[Stoneman]

I don't have the problem

But reading about it and thinking IMO it's not the ECU as a lot don't have the problem so in my thinking its mechanical

If the actuator arm is to short for example. My thinking is there not calibrated in any way just mas produced and if the builder lacks the ability to count who knows how many turns it has when built

Is it worth comparing the length of the actuator arm and boost readings?

Can people without the problem bring it on by shortening the arm?

[RHKTriton]

If the cat isn't up against the turbo you might as well ditch it, as it needs all the heat it can get to function.

[Redneck198033]

New dump pipe with cat on the way.

I'm using an EDS to look at my MAP & pressures are spiking to 255 ( 255Kpa = 37psi) .
What pressures are normal here??

[Cowboy Dave]

peaks of 25 ish PSI

[MilkmanDan]

3" turbo back xforce no cat on mine, peaks 24psi. No limp mode ever touch wood.

May be worth looking at modding the vgt actuator somehow for the people having over boost issues. It just doesn't seem to keep up as well as a conventional wastegate turbo does

[Stoneman]

37 psi, that sounds high I've never spiked at that high maybe 32 ish maybe lesss

I've made my actuator arm shorter to get rid of black smoke on take off as well

My guess is some of you need to back it off

Back it off one turn....it can't hurt just to test it, better than going into limp mode(if that's what it does)

[MilkmanDan]

New dump pipe with cat on the way.

I'm using an EDS to look at my MAP & pressures are spiking to 255 ( 255Kpa = 37psi) .
What pressures are normal here??

225kpa is only 32psi.

[Redneck198033]

Yes it is.
on the EDS for the MAP is spikes to 255kpa = 37psi.

I'm only assuming that the manifold pressure is a direct result of the turbo.

Also I do get it to sit in the 245's for a few seconds.

Also how is everyone getting their turbo pressure, eg gauge or EDS tool?

My rig Idles at 90kpa = 13psi. What should I see here??

[MilkmanDan]

Apologies my friend, I read it as 225.

Don't get vacuum and positive pressure mixed up. I haven't toyed much if at all with diesels but tuning in turbo petrols at idle they can pull up to similar numbers depending on cam specs.

If it was me I would throw a cheap boost gauge on and see what it says, I could be wrong but I don't think the 3.2 or 2.5 would be running higher than a 2 bar map sensor so this readings may not be possible, it could be theoretical numbers depending what pids the scan unit you have reads.