Larger intercooler?

[74Nitro]

No, I have machines running around with no added venting with the TAPP primary, XS belt and proper offset and have never blown a belt. I believe the belt and roller issues I had were all on account of the stock Yamaha primary, so I have no plans at this time to add any additional venting.

Ok, thanks.
Aside from clutching I didn't know if you or others were looking to keep the engine and/or exhaust compartment cooler by adding airflow.

 

[KnappAttack]

I have a Hurricane add on intercooler. I will let it go for $300

Sent you a PM.

 

[justinator]

Ok, thanks.
Aside from clutching I didn't know if you or others were looking to keep the engine and/or exhaust compartment cooler by adding airflow.

Thats mainly why I like lower moflows and the ones by the knees……….I find underhood heat noticably reduced vs no venting at all. You feel it by the knees when slowing down.

 

[Turboflash]

Thats mainly why I like lower moflows and the ones by the knees……….I find underhood heat noticably reduced vs no venting at all. You feel it by the knees when slowing down.

I too have added venting similar. More front-facing and more rearward. I can easily feel underhood heat coming out. I have more on right side than left for obvious reasons.

 

[AAdavis]

I have a Hurricane add on intercooler. I will let it go for $300

Sold

 

[1nc 2000]

JM.02c

An intercooler needs a measurement of time to cool the air passing through it...the faster the air flows through the cooler the less time it has to cool the charge so a bigger cooler becomes more effective for the heat transfer.
Although I feel an intercooler is effective and necessary for our turbo sleds, I think rather then increasing the cooler's size, first its more important to ensure the intake air that the cooler is temperature managing is as cool as possible. In the snowmobile world we are very fortunate to have access to cool ,normally well below freezing temperature, and dense air for our engines air intakes to use.
IMO a true cold air intake to feed the air passing through the intake system is the simplest and most effective way to control intake temps and enhance or maintain engine performance. A cold air intake with a little ram air effect is even better.
For my application I have chosen to go with a true cold air intake, enhanced engine cooling capacity, and full venting to keep all temps as low as possible.
Works for me

View attachment 174447

View attachment 174448

Bob would you say the ram air intake is where your getting your higher boost number from?

 

[Doc Harley]

That's a good question...I have had the Gap ram air on my sled for the last few seasons, right since it first became available, but I never sealed the airbox stock opening until this year. My boost is definitely up about 1 psi this season so that may be why but I don't know for sure. I do think my IATs are a little lower on a long run.
I also remember that when the Japanese sport bikes added Ram Air on their bikes 20 years ago they claimed 10+ hp at speed so who knows

The bikes are naturally aspirated and the motor is seeking 100% volumetric efficiency. I would just accept the fact that it's a nice looking, well crafted piece.
Race cars don't like any boxes. The turbine housing is faced directly into incoming air.

 

[74Nitro]

That's a good question...I have had the Gap ram air on my sled for the last few seasons, right since it first became available, but I never sealed the airbox stock opening until this year. My boost is definitely up about 1 psi this season so that may be why but I don't know for sure. I do think my IATs are a little lower on a long run.
I also remember that when the Japanese sport bikes added Ram Air on their bikes 20 years ago they claimed 10+ hp at speed so who knows

I'd think the boost will be whatever the computer tells it to be according to the map. The ram air will have no effect on boost, but I agree that it lowers IAT's given it's sealing off under hood warmer air.

 

[Doc Harley]

I'd think the boost will be whatever the computer tells it to be according to the map. The ram air will have no effect on boost, but I agree that it lowers IAT's given it's sealing off under hood warmer air.

But at 70mph+, how much of the under hood air is effecting IAT's? Idk, can't be too much vs an open air filter that's directly in front of the pre-filter or screen on our cowl/hood?!

 

[1nc 2000]

It all helps. Not enough snow to ride yet.
Some people are out packing down a little base.

 

[74Nitro]

But at 70mph+, how much of the under hood air is effecting IAT's? Idk, can't be too much vs an open air filter that's directly in front of the pre-filter or screen on our cowl/hood?!

On Bob's sled shouldn't be any.
On my sled with the under hood CAI, there will be a mix of warm air drawn in.

 

[Doc Harley]

On Bob's sled shouldn't be any.
On my sled with the under hood CAI, there will be a mix of warm air drawn in.

Hmm..I see. I'm speculating the difference is not enough to sustain any advantage in performance.
Although I do notice Turbo Dynamics specifically calling it out as a must-have, down the road with his bigger tunes. At least I think he does, or did at one time.
I hope Bob knows I've always looked at that piece and wondered how and why.
It has some value, it could just be cosmetics.

 

[justinator]

I plan on testing gap with cap, gap with open top and stock airbox one day…….back to back testing to satisfy my curiosity. I think the cap is needed to make the most of it but we’ll see I guess

 

[sideshowBob]

Bob would you say the ram air intake is where your getting your higher boost number from?

I have no way of knowing but even before the gap intake my sled has always made 1 or 2 pounds more boost then the other SWs around here that I am familiar with and more then the posts people have made with similar tunes so I don't know if its my map sensor indication or the sled just makes more boost.
I talked to Dave at Hurricane a few seasons ago and he looked at my logs and said the sled was making more boost on each of its tunes then it should.
I do know that since I upped my fuel pressure the sled is revving higher and needs more primary weight so its making more power with more fuel so its all good

 

[Doc Harley]

Bobbbb....what else have you done that you're not telling us...lol. secret secret....