What is normal Boost temps vs danger - Kawasaki Ninja H2 Forum
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post #1 of 69 Old 06-06-2019, 07:18 AM Thread Starter
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What is normal Boost temps vs danger

So like the title says:
What is normal boost temps vs danger zone boost temps?

Stock
it stayed around 140-150 F’ normal riding.
Under heavy load it went up to 180F’

Modded
It cruises at 150-160 F’
Under heavy load it goes up to 190 F’

At what point should I immediately let go of throttle and let’s it cruise to cool down?

Can the boost temp reach reach 200 F’ before I let off?
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post #2 of 69 Old 06-06-2019, 08:48 AM
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Saw this posted back in 2017.



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Jan 08, 2017 #1
Update on Boost Temps..
First of all, @Turbo392 saw your video in the snow, are you F’n crazy! My bike has never even seen water

Did our usual Sunday canyon run in 70deg weather today (sorry Turbo) and absolutely SMOKED my fellow Hayabusa & BMW riders, GPS verified top speed was 191 before I had to shut down, but it was how hard-n-fast that I ran away that was the ear-to-ear grinner

Anyway when I got to the end of the straight and shut down I looked at my boost temp and it was at 247f, that’s 25deg more than I had seen on the track (because it was a sustained WOT on the straight run). Asked my builder if there could be any damage and he said no, not for that short period, said he had it to 272f during the dyno. Ok that freaked me out. Anyway so I’m trying to get this intercooler as soon as possible, but just wanted to throw these numbers out there for the interested parties.
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post #3 of 69 Old 06-06-2019, 08:57 AM Thread Starter
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Originally Posted by Ryan Hilfiker View Post
Saw this posted back in 2017.



racer172
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Jan 08, 2017 #1
Update on Boost Temps..
First of all, @Turbo392 saw your video in the snow, are you F’n crazy! My bike has never even seen water

Did our usual Sunday canyon run in 70deg weather today (sorry Turbo) and absolutely SMOKED my fellow Hayabusa & BMW riders, GPS verified top speed was 191 before I had to shut down, but it was how hard-n-fast that I ran away that was the ear-to-ear grinner

Anyway when I got to the end of the straight and shut down I looked at my boost temp and it was at 247f, that’s 25deg more than I had seen on the track (because it was a sustained WOT on the straight run). Asked my builder if there could be any damage and he said no, not for that short period, said he had it to 272f during the dyno. Ok that freaked me out. Anyway so I’m trying to get this intercooler as soon as possible, but just wanted to throw these numbers out there for the interested parties.
Really so my 190f modded is nothing then.
I’m just trying to be really cautious as to not blow this dam motor lol
I’m seconds away from pulling trigger on intercooler
I don’t want intercooler to make more power
I believe bike is perfect as is 241 is more then enough for turns n straights when they present themselves.
I’m thinking intercooler so I can keep temps down.
Now there are people with intercooler and they say they most they see is 160f under load
So I thought my 190 for a brief spring was bad
Especially considering stock numbers were very moderate
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post #4 of 69 Old 06-06-2019, 04:02 PM
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I believe there were other posts thru the years that came to a general consensus that over 250 is the damage areas for long term. One guy was running WOT for miles with an overboosted bike and it air conditioned the block. The rule of thumb seemed to be if you change supercharger gears, intercool it.


Mine would hit 221 on street pulls in NOLA heat/humidity and then coast right back down to 190 where it generally stayed with spirited riding. I always believed 145 is where it should cool down to before a street pull...empirical only.



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post #5 of 69 Old 06-06-2019, 04:42 PM
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STOCK 2016 H2 one mile pull in 6th gear from 100 mph to 189 mph, starting IAT 150F, ending IAT 238F

I also have a STOCK 2018 H2 SX and get exactly the same results!

Temp 85F Florida both times, same conditions.

238.106 mph GPS Autobahn - Pump Gas
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post #6 of 69 Old 06-06-2019, 04:46 PM
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I have not seen over 150* top of 5th with 19/38 gearing 14000 rpm, mine is intercooled. 78* day in Salt Lake City.
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post #7 of 69 Old 06-08-2019, 09:57 PM Thread Starter
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Yea other night I ran it hard and it went up to 221f
Was going hard against a 2019 bmw.
The bike definitely goes over 189mph
The way things seem I’m definitely gonna end up putting an intercooler
Constantly looking down at that speed is not safe lol
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post #8 of 69 Old 06-08-2019, 09:58 PM Thread Starter
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On the track highest i saw was 190f
In lightening njmp
High speeds is when temps really go up
On track one selective few times u reach 150-160mph
So track is a piece of cake
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post #9 of 69 Old 06-09-2019, 08:46 AM
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I've done many standing miles to over 200mph on my H2, the fastest so far being 221. I do check the intake temp' before a run as cooler is better but I've never looked at it at the end, usually there's too much else to think about - like stopping. I will try and remember to have a look at the next meeting.

Go Fast Or Go Home
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post #10 of 69 Old 06-09-2019, 10:54 AM
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Its pretty easy to just mount a GoPro on a stem mount or tank suction cup. Then pull over and play back with the app for instant feedback on what you did without having to look down. Ask me how I know


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