770 Turbo Completed

1370rod

Well-known Member

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My turbo choose changed when I had issues with bolt threads on my small turbo. I kept looking at the AC190 turbo thinking how easy the installation would be so I decided to give it a try thinking if performance was poor on the 770 I could always put it on the 870. This was a fairly straight forward project using that turbo, Bolted up to the manifold and exhaust will exit the original location using the 190 elbow and spacer. I had to redo the factory oil drain pipe but it bolted up. Inlet and outlet air pipes had to be fabricated but there was room to leave the air filter and hood precleaner pipe exactly as they were. I am pleased the way this went together and it works well. Dynoed before and we had a very smoky 65 hp, so someone had messed with the fuel before . After turbo it has 91 hp with about one third of the exhaust smoke. I am very pleased with the numbers and plan on leaving it as is. The tractor will be used for recreation tillage and will not be a main work horse. It always seemed so sluggish compared to the 870 , but now the tables might have turned . Rod.
 
Looking GOOD Rod! Glad the smoke level went down. Do you have a boost gage on both manifolds? I'm curious what the readings are as I'm a nut for NO smoke under load at all.
 
Rod, great looking job on the installation. You gained 26 hp, did you do any more to the pump ? Jerry from Ohio
 
Thanks for offering to do that, I have requested to return it because of a bad bolt thread and for that reason you would not want it either, Rod.
 
Jerry the tractor dynoed at 65 hp and smoked bad before. That gives me reason to believe someone has messed with the fuel setting. I was surprised at the power gain just bolting the turbo on with much less exhaust smoke. So no I did nothing with the pump and will leave it as is because I am very happy with the results, Rod.
 
No I did not check boost, I was so darn happy with the hp I forgot to check. I will have to do that the next nice day we have. What should I have? Rod.
 
(quoted from post at 10:14:10 01/07/20) No I did not check boost, I was so darn happy with the hp I forgot to check. I will have to do that the next nice day we have. What should I have? Rod.

Rod, My 530 with moderate smoke peaks at 5 LBS Have not checked the power on the dyno but hills it struggled on in 12th gear it will do easily now at 3/4 throttle and It is entirely a different tractor working, I'm thinking it must be near 65-70 hp< it just does everything so easily.

I have built several 830 turbo setups and ran them at 95 HP but the old power cell engines need a few more degrees advance to make them come to life. The 770 may already be advanced near enough, the 830 liked 35 degrees but started a bit harder at that setting.

It is really rewarding to see it all come together
 

That project sure came together well Rod. 90 horses out of a 770 is really good output. I always thought that 770's were kind of a pooch, a big framed tractor w/low power. Don
 
did you put a restrictor of some sort in the oil supply line? When I did mine, it didn't take long before I was getting serious oil past the turbo seals as it couldn't drain away fast enough.
 
I told you that the turbo would really turn that 770 on. I think you made the rite decision with the larger turbo. You could likely gain a bit more with a larger air cleaner, plus the engine will run cooler. There is also an oil cooler available that mounts between the oil filter base and the filter. Looks good Rod.-----------------------Loren
 
I'd like to see the intake boost at the 10-12 PSI range, with exhaust PSI 1-2 below what the intake is. When you get above 15 PSI is where the intake air needs cooled. I still think if it smokes at all at 90 HP turbo is still a bit large. When I had the same turbo on my 560 with D282 it would barely make 8 PSI at 2500 engine RPM, and had more smoke than I wanted at 85 HP, and my biggest complaint was the boost started too late RPM wise. With the small wastegate turbo I have on now boost starts at 1100-1200 RPM range and exhaust is MUCH cleaner than before all through to 2500 RPM, and waste gate is set to open at 10 PSI. I just prefer a clean exhaust if at all possible. Is there a turbo that could be a better match? Sure. Would I leave yours as is? Sure, it's working well.
Now for a too SMALL turbo horror story. A good friend of mine bought a Keystone turbo kit for his Oliver 1550 diesel, tractor stock PTO is 54 HP which it did show 55 HP on my dyno. He got it all installed, and when on the dyno the power DROPPED to 50 HP! He was ready to yank it off but I said NO, I'm going to do some testing and make it work. I had a hunch the intake air was much too hot because of too high boost pressure. Turbo originally had a waste gate, but Keystone removed it and blocked the exhaust passage completely. With the intake pressure gage in place, engine running at high speed NO LOAD, the intake had 18 PSI, and went OVER 20 when the PTO load started!! Just what I thought, WAAYY to much intake heat. I removed the plug, tapered it, and "adjusted" the exhaust bypass to get 8-10 intake PSI under full load. Now, NO smoke at rated speed, and 71 HP like it should have. What I DON'T like is the low speed/mid range smoke, because it NEEDS a working waste gate. That's my next challenge, if I can talk him into letting me play a bit more..
 
No I did not, but did use a factory Case turbo drain pipe. That has a 3/4 ID in the pipe which should hopefully let oil coming out of a 3/8 line flow, Rod.
 
Mel the 530 sounds like a fun project to do, hopefully in the next year or so we can give that a try, Rod.
 
Thanks for your input Loren, I am glad it ended up we used that turbo. Just so darn easy to put this one together when so much bolts up. With some work I can get a 1070 cleaner to fit under the hood and still have the intake come through the hood in the same location. I know this 770 setup really has its limitations but I will see how we get along with it as it will not see much dusty conditions. Did you normally use a straight pipe for the exhaust after a turbo went on? Rod.
 
I would agree this turbo is probably a bit big for the 770, but for what I will use it for this is great. I was afraid lugging down in the 14-1500 range it would really fall off, but it sure has better numbers now than before in that range. These 770's have small valves compared to its bigger bore models, the pushing in of some air seems help. The 870 would really be happy with this setup. That for advice and input, its always appreciated, Rod.
 
If you enjoy reading performance books find a copy of TURBOCHARGERS, by Hugh McInnes. I got one of those years ago when I decided to put a turbo on the Olds 455 V8 in a C10 pickup. Book has lots of info about matching engine and turbo size, gas, diesel, and LP gas, water injection, lubrication, multiple staging, intercooling, etc. The Olds was on LP with Impco fuel system, and was a LOT of FUN!!
 
Local Dealer took one in trade many years ago .had a M W set up ran 110 Hp on 540 .they turned it back to 80 hp /sadly it had been on steel wheels /it was traded on a 5130 .
 
DT, that is the very book we used when we set our DC up many years ago, The results were much better than just grabbing a turbo out of the local junkyard, mostly turbs off the Corvair at that time, I actually had a special turbo setup that used a turbine off of the next size down from the compressor wheel so I could take advantage of the DCs low rpm characteristics. The compressor maps and pages of calculations to set one up in its sweet spot are a bit tedious but necessary, all in all it was fun, the old 39 was hard to beat in its day, 18.4 x38 full cuts , 3rd gear at more RPM than you can imagine out of a DC, probably in excess of 3500.
 
That book explained well about changing the exhaust turbine housing to speed up/slow down the intake compressor side when needed for different engine size and/or speed range. The turbo I had on the Olds 455 used a P.96 housing, and that same turbo is on the MF S90 puller now that you helped me with using the copper wire to seal compression and get rid of the head gasket. Since the engine is smaller than the Olds the turbine housing is a P.58 size now.
 
Rod,that's a great setup!I got lucky,my 1070 was turbo when I got it,,and mEL, Would you have any pics of your DC? that I would love to see,
Clint
 
(quoted from post at 21:46:12 01/08/20) Rod,that's a great setup!I got lucky,my 1070 was turbo when I got it,,and mEL, Would you have any pics of your DC? that I would love to see,
Clint
Clint, some years back I posted some stills of it pulling, I do not know if they are in the archives or not maybe they could be dug up.
 
(quoted from post at 21:46:12 01/08/20) Rod,that's a great setup!I got lucky,my 1070 was turbo when I got it,,and mEL, Would you have any pics of your DC? that I would love to see,
Clint
Clint, i researched that thread and found it was in January--2005, the link in there in the tread but sadly it does not open. Its a long shot but I will check with my son to see if he has the original disc that the pics were on but don't hold your breath.
 
mEl,thank you,but you do not have to go out of your way,it just seemed cool as,,,, to think a DC. Turbo'd,.I know where an SC sets that is in excellent shape,maybe,,,,,,.lol no,too many other projects,,,thank you clint
 

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