High piro temp

[Barney 338]

Wondering if anyone can help with this problem as I'm running out of ideas!
Just had my 93 GQ fully rebuilt td42 in a auto wagon to turbo spec. New radiator , water pump , fuel pump/ injectors rebuilt ,3 ' mandrel Exuast straight through , new pyro gauge, frozen boost intercooler , brand new Garrett 2871r turbo and replaced all fittings with speed flow. Pyro is on the bend on the dump pipe.
Put it on the dyno to tune it as the pyro was reading 400 to 500 normal running around. Was only making 70 hp. Fuel was increased but still only made 85hp. It's not blowing any smoke . Engine water temp runs at 80 deg c some times a bit less.
Normal running at 12 pound of boost going up through the gears the pyro climbs fairly quick and once it clicks in to top gear it's straight up to 500 and will keep climbing but I back off as soon as it touches 500. Click it out of overdrive and watch the temp drop like noth else. Every time I'm in top gear or a hill regardless how steep or bearly a incline the pyro climbs up high. Y is it getting so hot???

[threedogs]

Might want to jump over to the intros first before asking a question, just something the forum asks of us all,
You'll get a better response to

[Ben-e-boy]

It could be many things. Your turbine housing could be too small to properly spool up the large compressor, Also your intake could be very restrictive, meaning the turbo has to work for its air which it isnt designed to do.
I have a 3071, and before I got my new intake (4inch snorkle to turbo with airbox to suit LS1 airfilter, my pyros would climb dramatically after about 3000rpm due to the highly restrictive ZD30 airboxand filter.

[Barney 338]

Ah righto , intakes a 3" snorkel and Donaldson air box and filter feeding the turbo

[Ben-e-boy]

You will need to get a 4 inch snorkle thats for sure. Take the piping between the snorkle and the airbox off then take it for a quick drive, that should make a bit of difference, failing that you start disconnecting each section of piping including the air box lid , air filter. When I had similar issues I was told to do this, when the filter is removed use a stocking to filter the crap big enough to do damage. Go all the way to the turbo.

[BillsGU]

First things first - get the pyro tested / calibrated to make sure you are not chasing your tail. Otherwise - high EGT is a result of too much fuel or not enough air. Not something you can diagnose in your back shed in most cases. Need to find a good diesel mech in your area.

[threedogs]

Surely a Dyno tune would sort it out quick enough

[Ben-e-boy]

First things first - get the pyro tested / calibrated to make sure you are not chasing your tail. Otherwise - high EGT is a result of too much fuel or not enough air. Not something you can diagnose in your back shed in most cases. Need to find a good diesel mech in your area.


Surely a Dyno tune would sort it out quick enough

These symptoms are very similar to what winnie had with his 2876. The turbo is choked. Its easy to test by disconnecting piping as stated in the post above.
The tell tale is that it is only making 85hp which is less than what I managed to pull out of my 4.2 when it was N/A.

[Winnie]

These symptoms are very similar to what winnie had with his 2876. The turbo is choked. Its easy to test by disconnecting piping as stated in the post above.
The tell tale is that it is only making 85hp which is less than what I managed to pull out of my 4.2 when it was N/A.

Absolutely. I was running 16psi and only made 80kW. A smaller turbo, intercooler and a good tune on the same 16psi and I am making 50% more power now.

[Barney 338]

So I pulled the air intake pipe off . Put a 3 inch pod filter straight onto the turbo, didn't change anything. Tested the piro readout against a digital heat gun in the same place only external and there within 3 deg of each other.
Next will be pulling the fuel pump back out and putting on the bench double checking it and the timing and see if that turns up any thing

[Ben-e-boy]

So I pulled the air intake pipe off . Put a 3 inch pod filter straight onto the turbo, didn't change anything. Tested the piro readout against a digital heat gun in the same place only external and there within 3 deg of each other.
Next will be pulling the fuel pump back out and putting on the bench double checking it and the timing and see if that turns up any thing

How did you go?

[nissannewby]

Turbo is incorrectly sized for your motor.