Finally picked up my 700 Diesel. Mod time! - Page 52 - ArcticChat.com - Arctic Cat Forum
Diesel ATV'S A place to talk diesel only!!

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post #511 of 515 Old 04-22-2018, 04:09 PM
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post #512 of 515 Old 01-08-2019, 06:43 PM
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Whitbread - This is now an ancient thread, but a good read none the less... I had a local turbo shop do a genuine IHI RHB31 install on a 2015 AC 700 Diesel similar to the one in this now infamous modding post. Test drove it today and we noticed that some oil drops had sprayed out of the dipstick tube while driving it about 1/2 a mile (the dipstick wasn't fitting in there tightly and I can't remember if there were ever o-rings on it or not to hold it in tighter). In any event, the shop recommended either just putting o-rings on the dipstick or adding crankcase ventilation. My thinking on this is to go ahead with the o-rings, but to also have a breather added that just vents to the environment rather than trying to recirculate. Perhaps just drilling a hole in the valve cover and adding a short tube with a small breather filter at the end?

The turbo oil supply is through a 1.5mm restrictor (I assume this is needed given it's a journal bearing turbo) and drains back down to the pan similar to your 2007. Otherwise, there's nothing special - turbo installed in exhaust stream and compressor supplied by stock filter in normal location and routed to engine intake with aluminum tubing.

I didn't notice much of anything in the way of increased performance, but I haven't adjusted the fuel screw yet either, so I assume I already have enough air for the limited amount of fuel being provided, even at high altitude (5000'). I didn't notice a whistle, but I also have the stock exhaust on so that could be keeping it quiet. I guess the crankcase being pressurized is good confirmation that the intake is pressurized and the system is generally working, just needs more fuel to wake it up and take advantage of the increased air.

I'd really appreciate your thoughts.
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post #513 of 515 Old 01-09-2019, 05:58 PM
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Originally Posted by Chandlerbingco View Post
Whitbread - This is now an ancient thread, but a good read none the less... I had a local turbo shop do a genuine IHI RHB31 install on a 2015 AC 700 Diesel similar to the one in this now infamous modding post. Test drove it today and we noticed that some oil drops had sprayed out of the dipstick tube while driving it about 1/2 a mile (the dipstick wasn't fitting in there tightly and I can't remember if there were ever o-rings on it or not to hold it in tighter). In any event, the shop recommended either just putting o-rings on the dipstick or adding crankcase ventilation. My thinking on this is to go ahead with the o-rings, but to also have a breather added that just vents to the environment rather than trying to recirculate. Perhaps just drilling a hole in the valve cover and adding a short tube with a small breather filter at the end?

The turbo oil supply is through a 1.5mm restrictor (I assume this is needed given it's a journal bearing turbo) and drains back down to the pan similar to your 2007. Otherwise, there's nothing special - turbo installed in exhaust stream and compressor supplied by stock filter in normal location and routed to engine intake with aluminum tubing.

I didn't notice much of anything in the way of increased performance, but I haven't adjusted the fuel screw yet either, so I assume I already have enough air for the limited amount of fuel being provided, even at high altitude (5000'). I didn't notice a whistle, but I also have the stock exhaust on so that could be keeping it quiet. I guess the crankcase being pressurized is good confirmation that the intake is pressurized and the system is generally working, just needs more fuel to wake it up and take advantage of the increased air.

I'd really appreciate your thoughts.

You should have O rings on the dipstick. They may have broken with age.

Smelly Cat. 08 700 Diesel. Smoke screw tweaked for smoke. RTR Flex bracket with a little lift. Stock looking hollow muffler. Mud Pro snorkel added for looks. Two batteries, because two is greater than one. Other stuff to be added later.



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post #514 of 515 Old 01-17-2019, 12:50 PM
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You certainly need the o-ring. Also you may want to put on a catch can to collect some of the crank case oil fog and let it run back into the motor. Might want to install a boost gauge and yes, gut that constipated muffler out! Couldn't believe how much stuff was in mine. Also, the exhaust will sound really cool, deep. Lastly carefully screw the locked torque screw in as far as you dare. I gooped a little blue Locktite on mine for insurance. My 2008 motor has a tag saying that max rpm is 4300, but (4x4hans) said his 2015 had a 3800 or maybe 3600 rpm speed limiter. So it may be possible to get more top speed with the governor spring for a 2008 model. Anyway, once you max out the fuel, you should see quite a difference! When 4x4hans visited me this summer we took both of my Cats on a 200 mile ride. Cruised between 35 and 50 mph. Hans' daughter drove the last 44 miles with Hans in the back seat between 45 and 50 mph, so I guess they like to run! You should see a nice puff of black smoke, if you nail it from a stop and after gutting out the muffler a really cool whistle from the turbo.

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post #515 of 515 Old 01-18-2019, 12:15 PM
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Thanks. I ended up rerouting the PCV to the turbo inlet and did add 3 o-rings to the dipstick. Seems to have solved the problem and can definitely feel the increase in power with little to no turbo lag. I've heard before that the 2015 model year LDW702 engines were limited to something like 3800 rpm, but doesn't matter much to me because top speed isn't what I'm looking for since most of our trails are very rocky, narrow, and technical, so slower speeds with a lot of low end torque is where I need to be. I can hit about 45 or so on flat roads and that's enough. The issue has been that it takes forever to get up to that speed with two riders and at 9000' altitude. Not enough air up here so turning up the fuel screw up until this point has been useless, but that's about to change. =) I have to maintain the spark arrestor here legally and because of high risk of forest fire, but I may see about removing some of the restriction in the stock exhaust if I don't end up going with the Speedworx aftermarket muffler (for reference, they confirmed that all of their mufflers incorporate a spark arrestor).
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