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Have upgrading plans for my 4.2 turbo diesel and wonder if the stock turbo is any good, thinking of around the 300hp mark Am going to get an 3" exhaust all the way, FMIC, custom intake, if the stock turbo is out of the question, am going for maybe a GT2871R.86AR or a GT30.
Have the GT2871 on my GQ, which is a 2.8 by the way, so maybe a GT30 is more suitable, using it on the road so want power higher up also, not just a lot of power down low
The 3231 with .63 A/R journal bearing oil lube - no water cooling. It has lotsa power, starts boosting at 1600rpm and has power up past 3000, I am running an air/air intercooler and 15 pounds boost. Will be switching to water/air intercooler this fall.
My turbo is nice and big, doesn't work hard, and will long live past the life of the engine because of its size and it is being used on a diesel. The GT28 series are too small, the companies sellingn turbo kits all use turbos that are too small now as there was no other easy choice when they made them up. Your truck is a 4.2 litre - so make sure you go big.
I'll be dynoing it again when the new tranny/transfer go in it this winter. First moderate dyno run with no intercooler and low fule with 8-9 pounds was 33 percent increase in HP and 39 percent torque. Now with the intercooler, upped fuel and 15 pounds it is really cranking it out - with 36's on it it really flys.
vn15 wrote:Have upgrading plans for my 4.2 turbo diesel and wonder if the stock turbo is any good, thinking of around the 300hp mark Am going to get an 3" exhaust all the way, FMIC, custom intake, if the stock turbo is out of the question, am going for maybe a GT2871R.86AR or a GT30.
Have the GT2871 on my GQ, which is a 2.8 by the way, so maybe a GT30 is more suitable, using it on the road so want power higher up also, not just a lot of power down low
What engine are you running?
Is that 300HP at the wheels or crank you are chasing?
I am running 2871R on a 1HD-FT tried the .86 exhaust first a little lazy off the line but good top end continues to pull hard til the governor pulls back
went to the .64 exhaust housing improved bottom end negligible top end loss
The factory CT26 struggles to make power up high IMO Phisically a large turbo to look at compared to the garrett but not as capable IMO
CT26 made 155HP at the wheels @ 15psi at the intake with gas as well have not re dynoed since the garrett was fitted
Some quick calcs from the garrett web site you need ~ 42 lb/min of air & a pressure ratio of at least 2.2 (18psi boost min) assuming you are at sealevel & you are chasing 300HP at the crank, (300HP is a tall order for a 1H***) the compressor map for a 2871R is probably a bit too small at the risk of over speeding the turbo
IMO any larger turbo than this will make the bottom end so under boosted that it will have to be over fueled down low to make it driveable (high EGT to the point of permanent engine damage)
Lots of my opinions!!!
Good luck
The 3231 with .63 A/R journal bearing oil lube - no water cooling. It has lotsa power, starts boosting at 1600rpm and has power up past 3000, I am running an air/air intercooler and 15 pounds boost. Will be switching to water/air intercooler this fall.
My turbo is nice and big, doesn't work hard, and will long live past the life of the engine because of its size and it is being used on a diesel. The GT28 series are too small, the companies sellingn turbo kits all use turbos that are too small now as there was no other easy choice when they made them up. Your truck is a 4.2 litre - so make sure you go big.
I'll be dynoing it again when the new tranny/transfer go in it this winter. First moderate dyno run with no intercooler and low fule with 8-9 pounds was 33 percent increase in HP and 39 percent torque. Now with the intercooler, upped fuel and 15 pounds it is really cranking it out - with 36's on it it really flys.
Regards.
Louis
Hi Louis interesting turbo, can you tell me what is the lowest revs that will make 10 PSI and do you have a pyro so we can compare, what was the turbo worth $ always keen for improvements!
Hi Duck, actually not sure, never took not as to the lowest revs at 10psi. And I have just disconnected my tach. If I am on a steep hill or putting the engine under load it boosts immediatly. If I want boost off the line I can go to a .49 a/r but I like the setup that I have now.
I keep my egt's at about 1000 max although I can puch them over if I try. I expect the water/air intercooler to make an improvemnt over the air/air that I have now. This whole setup is experimental for me, bnut mostly taken what people have done right and wrong and used the pro's advice on picking the right turbo.
Once I install the new injection pump and some other mods I expect to be putting out some serious power.
Thanks guys, have 4inch lift, 35" tires on it now, the GT2871R.86AR is working great on my 2.8 GQ, lot of power up in the rev range, starts to boost at 1600, 0.5bar at 2000 and 1.3 bar at 2800, so being a 1HD-T 4.2 in the Yota, a GT30 seems the turbo to use I guess.
Hows the presicionturbo you have compared to a GT30 size wise
Not sure, I just asked my turbo genius guy and he said - "all those turbos are too small, I can't believe they are using disco potatoes (GT2870), GT25's and such, they are the wrong turbo for a 4.2 litre diesel". Then he said that precision makes the hot sections for turbos and that this one would be best.
I'll try to get the exact specs on it for you if you want. I have sold a few of these to guys around here (Canada) - they are also pretty cheap - cheaper than the 2870.
When it comes to this stuff I don't waste my time trying to figure out what is best - I just listen to the pro's and use my time for other things.
I will disagree on these facts your turbo man has said. Does he have dyno figures/ proof they are too small, or is he just going off what the horsepower rating is.
A 300hp, 200kw 1hdt is possible. If its at the tyres it had better be in 2wd only. It will be smokey down low. It took alot for us to make 200rwkw in a td42.
Turbo sizing is determined via power required and airflow. Diesels flow more air for less power than a petrol, fact.
Andy
www.diesel-tec.com.au Ph 03 9739 5031
Ball bearing turbo upgrades for factory turbo vehicles. Got a diesel question just ask.
Home of the twin turbo shorty and many 150rwkw+ patrols.
Hi DZL, maybe "too small" isn't the correct phrase, maybe "not best"suited is better. I can't even begin to explain why it would be better - or not be better as that is not my speciality. But I trust the guy as he is a very well known turbo supplier for diesels and gassers here. Dyno results - nope, he wouldnt need them.
Do the Disco potato and the GT25's work (and others), yes, and they work great, are they the best - I highly doubt it. His main points IIRC from last year - better cooling, lower EGT's, longevity, and some other things I can't remember.
If I get a chance I'll talk to him and get better details. I'll also post dyno results with the new tranny/transfer, and injection pump. My truck is out of the mines, 5000 hours, tanny/trasnfer bagged, injection pump tired. Truck rocks though.
Dzltec wrote:I will disagree on these facts your turbo man has said. Does he have dyno figures/ proof they are too small, or is he just going off what the horsepower rating is.
A 300hp, 200kw 1hdt is possible. If its at the tyres it had better be in 2wd only. It will be smokey down low. It took alot for us to make 200rwkw in a td42.
Turbo sizing is determined via power required and airflow. Diesels flow more air for less power than a petrol, fact.
Andy
Hey Dzltec are you able to give any specs on that combo like
turbo make/type?
boost pressure?
engine?
pump mods?
intercooler?
additional fuels.... methonol/LPG?
those numbers sound like serious fun!
Understand if it is Privileged info, it is your bread and butter.
Turbo was Garrett bb, front mount i/c, pump reco'd and modified done by us with a 12mm h&r, boost around the 18psi region, engine factory td42t.
Andy
www.diesel-tec.com.au Ph 03 9739 5031
Ball bearing turbo upgrades for factory turbo vehicles. Got a diesel question just ask.
Home of the twin turbo shorty and many 150rwkw+ patrols.
Am going to get an 3" exhaust all the way, FMIC, custom intake, if the stock turbo is out of the question, am going for maybe a GT2871R.86AR or a GT30.
