TD42 Boost ?

[jackal2828]

Hi all ,

Got another question in regards to the amount of boost on the engine with out doing any damage .
I am after torque with fuel efficiency so after the turbo gave out while up at Fraser 12mth ago i got onto MTQ and dropped a Mitsubishi wheel and opened up the housing after her explained that the nissans where a little under powered and haven't changed their design in a few years also the exhaust with a 3inch dump pipe and stage-3 3inch system
Then went off to get it tuned on the dyno told the guy what i was after , he took two days and balls it up.
on the drive home it chewed about 20lts of fuel over 40km pushed out 21psi on the boost gauge and drove like a v8 .
So after a good blew over the phone and doing my a load of coin i backed it down to around 14psi but not quite sure if its to high after the original was only running around 7psi.

[Ben-e-boy]

I am running 21psi, with a 12mm pump and getting 11-12 L/100

Is yours inter cooled?

[jackal2828]

Huh , got no inter cooler as yet that will be next up grade , i take it you replaced your pump from standard ? think at the moment i'm getting around the low 12's L/100

[Ben-e-boy]

Huh , got no inter cooler as yet that will be next up grade , i take it you replaced your pump from standard ? think at the moment i'm getting around the low 12's L/100


Yep replaced the pump with a larger unit.
Before I inter cooled mine I ran 13 psi without a drama

[jackal2828]

How long have you been running those pressures , any probs with the engine after the pump was fitted ?
I bumped into a guy at the deny ute muster a while back and chatted to him about his turbo , said he was running high pressures and had no dramas but he had a bit in him so didnt really trust him .

[Ben-e-boy]

There are guys out there running boost well into the 30's
The issue is once you are making about 850 ish Nm of torque guys are snapping cranks at No 6 . BUT. There could be many other factors that can contribute to that. Ie dropping the clutch at 4000 rpm.
A member here by the name of Bambil has a high power td42 around the 280hp mark and has done for a long long time without dramas

[jackal2828]

I'm a little confused , are you running 21psi or 13 psi ?
Are these other guys using there trucks in comps or something , cant say i have ever heard anyone going into the 30s and they must have done other mods to handle the high torque so as not to shag an engine

[Ben-e-boy]

Yep replaced the pump with a larger unit.
Before I inter cooled mine I ran 13 psi without a drama


I'm a little confused , are you running 21psi or 13 psi ?
Are these other guys using there trucks in comps or something , cant say i have ever heard anyone going into the 30s and they must have done other mods to handle the high torque so as not to shag an engine


Before 13 psi and after 21psi mate. On the same turbo.
I am still waiting for the new one, that will be set to 24.

The Td42 is a strong engine. It can handle a a fair bit.

[jackal2828]

So no internal mods are not needed on the td42 you say , im already up to 170,00km and was thinking of full rebuild kit through it i think there only $2500 thats the reason behind the question about the boost , would rather sought any issues out before the rebuild .
Might try winding it up a bit more and see how the economy goes seems you are getting 11-12 L/100

[Ben-e-boy]

So no internal mods are not needed on the td42 you say , im already up to 170,00km and was thinking of full rebuild kit through it i think there only $2500 thats the reason behind the question about the boost , would rather sought any issues out before the rebuild .
Might try winding it up a bit more and see how the economy goes seems you are getting 11-12 L/100

You only have the standard pump, keep the boost where it is and get a dyno tune.
170,000 is hardly worn in. If it has had a good service history you'll be right. Looked after you will see well over 500,000 km doing the injectors and maybe a few seals overhauling the injector pump

[jackal2828]

yeh only a stock pump had a guy dyno it and stuffed it so had the pump done up and got it back to standard and cleaned the injectors at the same time , i have heard you can put in some bigger injectors save renewing the pump .
I forgot to ask Ben are you running the 4.2 in your GQ ?

[Ben-e-boy]

yeh only a stock pump had a guy dyno it and stuffed it so had the pump done up and got it back to standard and cleaned the injectors at the same time , i have heard you can put in some bigger injectors save renewing the pump .
I forgot to ask Ben are you running the 4.2 in your GQ ?

Yep. 96 ute.

[jackal2828]

I take it thats your rig in your profile pic , that wouldn't have been down in Anglesea near the Whichelsea

[nissannewby]

I run my GQ TD42 with MTQ turbo on it at 14psi stock pump and unintercooled and I can get 13/100 on it. My GU runs an aftermarket turbo with factory intercooler and pump and pushing 25psi up its nose. It's not the boost that kills these motors but high combustion temperatures and massive torque figures.

[MEGOMONSTER]

I take it thats your rig in your profile pic , that wouldn't have been down in Anglesea near the Whichelsea

Ben-e-boy and Matt(NissanNewby) are both Queensland boys and know how to talk things up. Lol
Great blokes and know too much.

[jackal2828]

I thought 30 psi is a little high , never heard of anyone running that high

[MEGOMONSTER]

I thought 30 psi is a little high , never heard of anyone running that high

Bennys truck, according to him is an unstoppable machine.
Just ask him.

[nissannewby]

Nuh there's people about running into the low 40's to get enough air to burn the fuel they are injecting. The most I have heard is 50psi which apparently caused damage. So your well and truly safe with what you want to do.

[jackal2828]

Sounds like you and Benny have a bit of banter going on haha i think i will just tickle the fuel up a bit and keep an eye on the fuel consumption but its good to find out what most guys are doing with the boost pressure , saves me from doing any damage .

thanks Ash .

[benno77gu]

hi fellas how do you get 12/100 mines a gu wagon factory turbo and I get anywhere from 17 to 20+/100 never 12 or 13 cheers

[nissannewby]

hi fellas how do you get 12/100 mines a gu wagon factory turbo and I get anywhere from 17 to 20+/100 never 12 or 13 cheers

Have you got the 3" dump pipe to go with your exhaust? Have you tweaked it at all or is it all still at factory settings?

[MudRunnerTD]

Hi all ,

Got another question in regards to the amount of boost on the engine with out doing any damage .
I am after torque with fuel efficiency so after the turbo gave out while up at Fraser 12mth ago i got onto MTQ and dropped a Mitsubishi wheel and opened up the housing after her explained that the nissans where a little under powered and haven't changed their design in a few years also the exhaust with a 3inch dump pipe and stage-3 3inch system
Then went off to get it tuned on the dyno told the guy what i was after , he took two days and balls it up.
on the drive home it chewed about 20lts of fuel over 40km pushed out 21psi on the boost gauge and drove like a v8 .
So after a good blew over the phone and doing my a load of coin i backed it down to around 14psi but not quite sure if its to high after the original was only running around 7psi.


Hi mate you have had some good advice to date here.

A couple of questions. Important questions. Do you have a GQ or a GU? They have different fuel pumps and need to be tuned differently.

If you have a GU then you already have an 11mm pump and you should be able to get a great tune out of it in the hands of someone that knows how to tune it.

Although your boost levels are not catastorphic ( as said a TD42 will take 25psi all day) it does seem a little high if you had it tuned as a daily?

Did you have it tuned in Geelong or Melbourne?

Take it down to Geelong and see Chris Dalton from Dalton Automotive in Wood street mate, he will sort it out for you. Spend NO MORE MONEY.

I also have a GQ and a GUIV TD42T and I get 12L/100 and very good power out of both.

[Ben-e-boy]

Hi mate you have had some good advice to date here.

A couple of questions. Important questions. Do you have a GQ or a GU? They have different fuel pumps and need to be tuned differently.

If you have a GU then you already have an 11mm pump and you should be able to get a great tune out of it in the hands of someone that knows how to tune it.

Although your boost levels are not catastorphic ( as said a TD42 will take 25psi all day) it does seem a little high if you had it tuned as a daily?

Did you have it tuned in Geelong or Melbourne?

Take it down to Geelong and see Chris Dalton from Dalton Automotive in Wood street mate, he will sort it out for you. Spend NO MORE MONEY.

I also have a GQ and a GUIV TD42T and I get 12L/100 and very good power out of both.

25 psi can be still good for a daily. Newby's GU has the electronic pump, and it has a very lineal power delivery. It is quite good. Even with a fully mechanical pump, a good tune and good throttle control it can be a comfortable daily.

[Ben-e-boy]

Bennys truck, according to him is an unstoppable machine.
Just ask him.

Your dam right it's a wicked bit of gear. Love it!!!!!!!

[MudRunnerTD]

25 psi can be still good for a daily. Newby's GU has the electronic pump, and it has a very lineal power delivery. It is quite good. Even with a fully mechanical pump, a good tune and good throttle control it can be a comfortable daily.

I agree Ben, but your average punter should be able to have a tidy TD42T running 15psi and have 90+rwkw and using 11 to 13l/100 all day.

[Ben-e-boy]

I agree Ben, but your average punter should be able to have a tidy TD42T running 15psi and have 90+rwkw and using 11 to 13l/100 all day.

Yeah for sure.

[benno77gu]

Have you got the 3" dump pipe to go with your exhaust? Have you tweaked it at all or is it all still at factory settings?it has the 3" dump pipe and still at factory settings its an 01 model cheers

[MudRunnerTD]

it has the 3" dump pipe and still at factory settings its an 01 model cheers

Get it on a decent Dyno and smile ;)

[MudRunnerTD]

Go for a drive up to Berrima Diesel for a tune mate. You will drive home happy.

[benno77gu]

Get it on a decent Dyno and smile ;)next question does now a good tuner around my area and how would I expect to pay cheers

[MEGOMONSTER]

Your dam right it's a wicked bit of gear. Love it!!!!!!!

This is why Queensland is such a big state, to fit everyone's head in. Lol

[Ben-e-boy]

This is why Queensland is such a big state, to fit everyone's head in. Lol


Lmao. I'll talk the talk. But walk the walk to...... Or crawl the crawl lol

[MEGOMONSTER]

Lmao. I'll talk the talk. But walk the walk to...... Or crawl the crawl lol

Just make Winnie miserable and give him a track even you guys can't get up.
Just tell you've done it twice.

[jackal2828]

Hey mudrunner ,

sorry thought i stated it was a QU my fault , got the dyno do in Melb Thomastown also got a good bit of advise from MTQ in regards to the boost compensator , gave me a little help in setting it up and told me to spin the plunger 90 deg and no more which brings in the boost a lot earlier

[MudRunnerTD]

next question does now a good tuner around my area and how would I expect to pay cheers


Go for a drive up to Berrima Diesel for a tune mate. You will drive home happy.

Berrima is north for you assuming your in Tumut. World class mate and a booking is essential. Give them a call and talk about cost.

Good luck, have fun, they will transform your car just with a tune!

[MudRunnerTD]

Take it up to Chris Dalton in Geelong for a tune on a Saturday mate.


Hey mudrunner ,

sorry thought i stated it was a QU my fault , got the dyno do in Melb Thomastown also got a good bit of advise from MTQ in regards to the boost compensator , gave me a little help in setting it up and told me to spin the plunger 90 deg and no more which brings in the boost a lot earlier

[jackal2828]

Hey just another question , i was thinking of tickling up the fuel and downloaded a manual for the GU TD42, 99 mod but couldn't find it in the manual , is there a separate manual for the injector pump ?

Cheers Ash

[nissannewby]

Nissan don't have much to do with the pump in their manuals as its generally outsourced from Bosch, zexel etc.

[jackal2828]

Yeh , i'm starting to see that in the manuals but i would have thought there would have been some sort of a break down diagram instructing you on the best fuel set , screw setting ect

[nissannewby]

There is plenty around on the net about the adjustments, also there is Bosch manual around somewhere for this pumps. The fuel is basically preset by a specialist, you can only adjust Max fuel, fuel delivery and idle. There isn't a specific spec and theoretically they aren't suppose to be adjusted hence the anti- tamper stuff on them from factory.

When you start adjustments just do small ones. That way if it doesn't do what you want you can change it back.

[jackal2828]

I think there is also a screw on the top of the Boost comp as well as the main fuel delivery screw that i played with last time, from memory you screw it anti clock wise on both for more fuel but not quit sure .
What are your thoughts ?

[jackal2828]

this is basically what im chasing , i found this on the bosch web site

[nissannewby]

Ok I'll try and explain it for you.

The little screw on top of the compensator is no boost fueling (from idle)
The screw on the back of the pump near the fuel return fitting is the max fuel screw (this adjusts overall fueling) so it gets more fuel in across the entire rev range. Clockwise to increase fuel.
The compensator pin is eccentric so there will be a shallow section and when you turn it the section gets deeper.
There are shims on the pin these allow the pin to travel further under full boost meaning you can get more fueling.
Then the spring base (star wheel) the further down this is changes the effort to over come the spring.

[jackal2828]

yep thanks , i thought the fuel comp allowed the extra fuel in ( under vacuum ) at the top end of the rev range just didn't remember which way the screw went either clock wise or anti .

cheers Ash

[nissannewby]

No vacuum. Just positive pressure to push the pin down.

[Bambill]

I'm a little confused , are you running 21psi or 13 psi ?
Are these other guys using there trucks in comps or something , cant say i have ever heard anyone going into the 30s and they must have done other mods to handle the high torque so as not to shag an engine

My GU work ute, which does 6-700km every week has as mentioned, earlier around the 280 odd hp mark and around 690-700nm.
It has 400k km on it and has never been toouched. Never opened up other than the rocker cover to adjust them every couple of years.
Different turbo and fuel pump obviously.
With the above performance it would return high 12l/100km economy if driven to the speed limit.
For the last 3-4yrs or so it has been running between 26-30 ish psi boost without a drama. New turbo now and sorting out a few issue, but the boost is up around 35ish psi, did have a little spike to 37.9psi the other day.
To put it generally, boost is not the issue. Temperature and boost cause issue. Control the temperature both engine and EGT and you are half way there to helping it survive. Touch wood.

Marty

[Ben-e-boy]

My GU work ute, which does 6-700km every week has as mentioned, earlier around the 280 odd hp mark and around 690-700nm.
It has 400k km on it and has never been toouched. Never opened up other than the rocker cover to adjust them every couple of years.
Different turbo and fuel pump obviously.
With the above performance it would return high 12l/100km economy if driven to the speed limit.
For the last 3-4yrs or so it has been running between 26-30 ish psi boost without a drama. New turbo now and sorting out a few issue, but the boost is up around 35ish psi, did have a little spike to 37.9psi the other day.
To put it generally, boost is not the issue. Temperature and boost cause issue. Control the temperature both engine and EGT and you are half way there to helping it survive. Touch wood.

Marty

I find it amazing that you still achieve the same economy as a N/A TD42 with essentially a 300%+ increase in power.
If only that could be achieved with petrol. I would no less than 500c.i. Lol

[Bambill]

I find it amazing that you still achieve the same economy as a N/A TD42 with essentially a 300%+ increase in power.
If only that could be achieved with petrol. I would no less than 500c.i. Lol

Yeh from the day I drove it out of the show room the best I could get was maybe 18's.
But with ample power you simply don't need to flog it to get it going. Normal everyday driving, with it spinning up to around 20-25psi quite easily is done without much throttle.
And contrary to what you may think, the amount of time it sees big boost over say 25psi is very little in day to day driving.
Gone through some fuel setting up new turbo though. Flog it and it uses it.

Marty

[Bambill]

I will ad though, (memory is slipping), that in the months before I changed turbo and pump I was getting mid 11's from the standard pump and turbo. Was 17 ish psi lots of timing, 4" snorkel, smallish bar and plate cooler. Made like 121rwkw and 420nm. Was making that 17psi by 1700rpm too.
You couldn't get in it and hold it flat though, you had to be on the ball, and a habitual gauge watcher.

Marty.

[AndyAnderson66]

Hi jackal2828 , I have seen :o TD42 engines' do well in excess of 500,000kms - I know of one with about 750,000kms on it. I have a 2H with 664,000kms on it. The pump was overhauled at 480,000kms and injectors - about - every 200,000kms, this is the only thing I have done to the engine apart from regular servicing🚘 (https://jeepequipment.com/best-battery-for-jeep-wrangler/)🤔.

[MB]

Here here, AA66 Mate!
Plenty of great old diesel donks pumps turned down and driver casual aware will go further again and again:-)
Still trying to break an old mates record on a 1,000,000km ++ still going TD42 although I keep changing drivers seats between a few same goodens [emoji106][emoji106]


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