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Old 05-09-2019, 08:36 AM
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Default How important is re-mapping?

Looking at building my first snow bike. Have the kit on order, snow checked a Riot LE
Now for the bike.. It will only be a play bike, I have a sled for the deep/mountain days. I just want something playful I can bomb along beside the trails as the wife learns to ride a sled.

Have it narrowed down to an '18 KTM 450 SX, or an '18 YZ 450F. Riding be -10*C to +10*C, and between 2,000 - 4,500' elevation. Just wondering how critical re-,sapping the bike will be, if at all? Have read where some guys are having issues over-feeling and getting fuel into the engine oil? Would re-mappping things help? Or am I way overthinking things. Just want to make the best choice possible, the first time.
Thanks in advance!
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Old 05-09-2019, 09:05 AM
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Fuel re mapping is more to correct for opening up the air box, and exhaust. The efi system will compensate for altitude and temp. on its own. The over fuelling issue is due to the engine temp being too low, and the efi system staying in warm up mode and adding more fuel. This issue is addressed by managing engine temp with hotter thermostat, shunting radiators, blocking airflow to radiators, engine blankets, ect. The goal is to maintain an engine temp of at least 180 deg f.
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Old 05-09-2019, 10:50 AM
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What he said.

I will concede there are small improvements available in the way the fuel can be delivered and when it is delivered but by in large the manufactures are not leaving a ton extra of performance on the table these days. Claims of 8hp yada yada through a remap I call BS. You can get improvements via fine tuning the fuel and timing which will help in setting up a better running bike. A bone stock bike is going to run pretty friggin well out of the box these days if you maintain your temps as stated. So is a remap necessary, no, is it something to consider, maybe down the road once you run out of things to spend money on. You really cant get a bunch more HP without making physical changes to the motor ie. cams and porting and high comp pistons, race fuel yada yada. More air, more fuel equals more power.

Buy a bike, get a Tstat, shrouds, engine blanket and my bet is all you will do is add gas and do oil changes.

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Old 05-09-2019, 01:09 PM
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Agreed with everything said in the prior responses. A problem associated with the warm up/over fueling of the stock ECU is you will end up diluting the oil with fuel. The challenge is keeping engine temps consistently above 160F at which point the warm up over fueling stops. You will also have days of trying to get it cooled down. These bikes can be managed by a Tstat, engine blankets, blocking and unblocking the rads. You will find quite a variance of conditions that affect engine temps even with the right gear. Having a snow specific tune that drops that warm up temp/over fueling is also one way to keep excess fuel out of the crankcase. PR2 has a good premapped ECU. I have it currently on three bikes. I did not purchase it for the possible performance gains, just keeping these money pits alive as long as possible!



Link to some PR2 info https://www.snowest.com/forum/showth...&highlight=PR2
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Old 05-09-2019, 01:15 PM
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Thanks guys ! Yes, I wasn't looking for more performance, just to correct the over-fuelling issue. Seems that's more an operating temp deal than tune, so that eliminates a variable when it comes to deciding which bike!

With that sorted, which would be the more reliable? I know Yamaha are sturdy as heck, but I'm thinking the better clutch and trans on the KTM MIGHT make it more suitable to a snow bike application?
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Old 05-09-2019, 01:30 PM
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Forgot to mention, make sure you install a temperature gauge so you can see where you are at.

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Old 05-09-2019, 01:47 PM
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Quote:
Originally Posted by G-Force View Post
Thanks guys ! Yes, I wasn't looking for more performance, just to correct the over-fuelling issue. Seems that's more an operating temp deal than tune, so that eliminates a variable when it comes to deciding which bike!

With that sorted, which would be the more reliable? I know Yamaha are sturdy as heck, but I'm thinking the better clutch and trans on the KTM MIGHT make it more suitable to a snow bike application?
I have a lot of time comparing a 2018 ktm 450sxf to a 2018 yz450f with ARO 120LE kits. The KTM wins hands down, it's not even close. I sold my yzf for a ktm 450.

No reliability issues with either bike.
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Old 05-09-2019, 03:41 PM
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Haven't seen over-fueling issues on KTM's for the most part, I wouldn't bother with a re-map on an SX or XC.

EXC's usually like a re-map if you ditch the smog equipment/change exhaust.
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Old 05-09-2019, 03:41 PM
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Just curious what the KTM did so much better then the YZ ? Iím currently running an 18 YZ as a snowbike and it runs really strong and has been bulletproof, but Iím always looking for an improvement if there is one when Iím eventually going to get a new bike.
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Old 05-09-2019, 08:32 PM
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Old 05-09-2019, 09:54 PM
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Old 05-10-2019, 08:17 AM
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Old 05-13-2019, 08:13 AM
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Old 05-13-2019, 10:37 AM
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Old 05-14-2019, 07:51 AM
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Old 05-17-2019, 05:44 PM
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Old 07-08-2019, 03:47 PM
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Old 07-09-2019, 07:38 AM
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Old 07-10-2019, 10:27 PM
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Old 07-11-2019, 07:28 AM
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Old 07-11-2019, 02:03 PM
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