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Polaris Ranger Diesel General Discussions for the Polaris Ranger Diesel

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post #1 of 32 Old 02-02-2012, 03:10 PM Thread Starter
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Turn up the fuel pump

The diesel shop did some research and talked to a Yanmar mechanic. They backed out the fuel screw 1-1/2 turns from stock. The mechanic said that the Ranger accelerates a lot quicker now, and gained maybe 2 mph. He said that the injectors in this engine will never be able flow enough fuel to be able to overheat the engine, so it's pretty safe to turn up the fuel without hurting anything.

Now she rolls the coal. LOL.

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post #2 of 32 Old 02-03-2012, 02:52 PM
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i overheated my engine with 10psi black smoke will over heat the engine u need more air

2011 Ranger diesel
PPE turbo
10psi
1200egts
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post #3 of 32 Old 02-03-2012, 07:21 PM Thread Starter
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Black smoke doesn't mean an engine is running hot.
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post #4 of 32 Old 02-04-2012, 06:26 PM
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black smoke is over fueling which creates heat. its not like a gas motor. the richer a diesel runs the hotter the egts are

2011 Ranger diesel
PPE turbo
10psi
1200egts
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post #5 of 32 Old 02-05-2012, 05:01 AM Thread Starter
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Anything under 1500F is fine. Mine's not near that hot.
Turning up the fuel makes a big difference. It accelerates a lot quicker. The diesel mechanic raised the RPMs up to about 3800, by adjusting that thing that looks like a little fire hydrant, above the fuel plunger adjustment screw. He said up to 4000 is about the limit for this engine. It certainly does smoke if you push the pedal to the floor, but the Ranger hardly makes any smoke and goes almost as fast if you only press the pedal about 85% of the way. So if you just don't mash it to the floor then you don't have to worry about a big cloud of smoke. The mechanic had the fuel plunger set at 1-1/2 turns out from stock. On flat ground the speedometer got up to 42 mph. Previously my top speed on flat ground was about 39. I then backed down the screw to 1-1/4 and my top speed went down to about 40, so I think I'll turn it up to about 1 3/8 and see what happens. Even at 1- 1/4 turns it still has lots more acceleration than stock, but not as much top speed as 1 1/2 turns. Anyway, I'm happy with the results. The engine isn't much warmer than it was before, even after a long drive at top speed. But I did buy a nice Pyrometer that I'll install later. I want to do some air box modifications too.

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post #6 of 32 Old 03-27-2012, 12:29 AM
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I just turned mine up to 3/4 and man what a huge improvement. I get my k&n tomorrow so I'll get back with ya on that one. But after reading this post I'm gonna turn mine up some more. I read the ppe turbo kit directions and it said 1.5 turns out with there turbo kit so I figured 3/4 was plenty safe. But it'll be cranking out some more tomorrow

2012 ranger crew diesel
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post #7 of 32 Old 03-27-2012, 01:10 AM
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I had to cut the little cover to access the fuel screw does anyone have a part number for that little cover and that special washer so that when I'm done I can put it back on. ( I'm still under warranty ).

2012 ranger crew diesel
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post #8 of 32 Old 03-27-2012, 09:13 PM
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Okay class can anyone tell me why Polaris doesn't want to cover stuff under warranty?

2008 Ranger Crew 700 Limited Edition
12,500 miles and counting as fast as possible
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post #9 of 32 Old 06-10-2012, 04:56 AM
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I'm sure they don't want to cover engine work when someone's had thier fingers in the pump
With that said, if I had bought the diesel like I wish I had, I'd probably turn it up too.
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post #10 of 32 Old 07-14-2012, 11:55 AM
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As a previous diesel truck owner I just caution you to get your pyro installed ASAP. I don't know if this thing is turboed or not from the factory but you still don't want to melt anything past the cylinder head. 1500 degrees is the upper limit. i wouldnt go past 1300-1350 The way mechs catch extra fuel is to look for star scorch marks on top of the piston, other than that they will be clueless. Just turn your fuel back before service.
I'm all for unlocking power the factory left behind. It's hard to kill a diesel. The only other thing id look at is clutch upgrades. Awesome work bro. I love that diesel smoke!
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