Cooling down the intake temps when warm out - hot!

[Snowaddict]

Maybe you didn't read my first post well enough. My buddy is riding a bone stock sled and heating the intercooler fast!!

Your only going to notice it when your WFO accelerating fast and the RPM drops and acceleration stops or just hits a wall after charging hard where it should keep going and climbing hard.

Was more referring to this part of your post:

"Seen the same thing last week up in the UP with mine and the 240 or 270 tune in it when temps were up in the high 30's last week."

 

[dgjr636]

Warmer vs cooler temps is a trade off sometimes.
Warmer conditions provide snow on trail to be more liquid for better cooling. Also warmer air has more moisture in it which is more dense. Making the sled to run richer and can produce slightly more boost. (Sometimes).

Warmer air temps = more moisture = more fuel = Richer fuel/air ratio.

Cooler air temps = less moisture = less fuel = leaner fuel/air ratio.

Air intake tempiture plays a big part also as well as under hood heat. There is many factors in optimizing horsepower/speed.

Trail conditions, Horsepower, Motor temp, intake Temp, Fuel/air ratio, etc.

 

[hibshman25]

My sled is all stock as far as engine, exhaust, intake ect.

I've done some testing with a small apex/vector radiator fan mounted behind the stock intercooler. Ambient air temps were very cold on the trip when I tested, and I didn't really notice much of a difference with fan running. Next trip I'm going to try a larger fan from the Fx nytro.

One thing I noticed, was my dad's MPI Viper with no intercooler runs much colder intake air temps. His does have a cold air intake outside the hood. Have not pulled his apart yet to see if it measuring before the turbo or after the turbo. If it's reading before turbo, then its really not reflective of the actual intake temp entering throttle body.

 

[sledding rocks]

If you're just cruising intake will stay down decent enough, even cruising at 80, but get into the throttle and intakes rise rapidly on a warm day. Its easy to notice if you are monitoring the intake temps on live date or on the dash if you're watching them.

Stock or tuned it does not seem to matter. They get hot fast and performance falls off when they get up there in the 1 teens to 120's F. Really notice it in the loose hard pulling warm snow conditions and warm weather when in the throttle hard.

Not sure a bigger intercooler will keep it cool for long either. I wonder if its a lack of cooling flow thru the cooler itself with high pressure building behind the cooler perhaps.

I see dave offer a intercooler , would be nice to see if this intercooler is more efficient then the stock one ,

 

[Never Satisfied]

I was looking at mine last night as it's finally all thawed out and see there is a solid plate behind the intercooler, so basically the air comes through and has a couple inches until it hits the plate then has to flow out 90 degrees. When I was in the UP the amount of ice that built up under the cooler was significant. I had frogskin material over my grill in front so no ice could build up between the grill and the intercooler. The snow dust must have been flowing around the cooler, possibly from the rear, hitting the warm intercooler then melting causing the ice. My IAT's were good but it was cold and even a 80 MPH cruising they were in the 30's. Never did many WOT pulls.

I was thinking of pulling the inetrcooler and drilling holes in the plate.

 

[saskattakman]

I've seen this too many times in the mountains first pull out of the trailer intake temps about a 1/3 up on gauge full power and rpms bang on second pull and rest of passes after that front grille is block of snow intake temps peg gauge at max then low on power. takes 3 days in a heated shop to melt that block of ice

 

[ROCKERDAN]

Mike, just wondering if the CAI helps much if at all compared to stock? I know al CAIs are not equal in design. Mine gets max cold air, while some designs I've seen the filter is not positioned well.

On the intercooler end of things....I often wondered about the design. I like how its out front "removed from the engine bay", however behind the IC, there is the divider wall, and I often wondered if this was too close, and does not allow for great flow as air hits there.

Good subject and something that we can all start to think about.

Dan

 

[KnappAttack]

Mike, just wondering if the CAI helps much if at all compared to stock? I know al CAIs are not equal in design. Mine gets max cold air, while some designs I've seen the filter is not positioned well.

On the intercooler end of things....I often wondered about the design. I like how its out front "removed from the engine bay", however behind the IC, there is the divider wall, and I often wondered if this was too close, and does not allow for great flow as air hits there.

Good subject and something that we can all start to think about.

Dan

Dan,
From what I've seen the CAI kits we're running whether bought or homemade doesn't do squat for intake temps. I have sleds running stock box and some have CAI and temps are no lower with CAI, maybe less restrictive, but no colder for certain. I have my filter stuffed right up front into the factory mesh, any further and I'd literally have to put it outside the hood, and I'm not doing that.

We very well could have a deal happening where the wind is stalling flow coming around the back of the cooler and killing any flow we think we have coming from the front side.

 

[Shagnos]

So Stock and lightly tuned the temps are skyrocketing but people are running 20 to 30lbs of boost for 5000 ft and no problem? What type
of Sorcery is this?

 

[WVTurboLTX]

My sled is all stock as far as engine, exhaust, intake ect.

I've done some testing with a small apex/vector radiator fan mounted behind the stock intercooler. Ambient air temps were very cold on the trip when I tested, and I didn't really notice much of a difference with fan running. Next trip I'm going to try a larger fan from the Fx nytro.

One thing I noticed, was my dad's MPI Viper with no intercooler runs much colder intake air temps. His does have a cold air intake outside the hood. Have not pulled his apart yet to see if it measuring before the turbo or after the turbo. If it's reading before turbo, then its really not reflective of the actual intake temp entering throttle body.

It's before the turbo on the MPI kits. It's in the cross over tube between the filter and turbo.

 

[drlee50]

Good point! Yesterday my sled lost rpm also... and I suspect that intake temp got high! And I think I know why...

Screw you and all your excessive snow problems ! Ugh

Sent from my LG-H932 using Tapatalk

 

[machzrobbie]

Here’s a good pull, 133 mph

 

[ROCKERDAN]

How warm was the ambient temp that day Robbie?

Do you always rev yours that high on 280 map?

thanks
Dan

 

[machzrobbie]

How warm was the ambient temp that day Robbie?

Do you always rev yours that high on 280 map?

thanks
Dan

Was Saturday +3 - sled was out of gear - that's why RPM so high

 

[KnappAttack]

Was Saturday +3 - sled was out of gear - that's why RPM so high

+3 F or C?