besides lookin cooler are they better same or worse than aluminum charge tubes, my question is after watching the EVO BRV video i noticed the silicone tubes expand under pressure so what would that cause and would the expantion cause any affects to boost levels?
Aluminum or Evolution's Silicone charge tubes
- Thread starter MikeM1000
- Start date
I didn't watch the video. In my opinion they should not be full length as the whole point is to contain the pressure and allow laminar flow from one component to the next. If the hoses are full length you will lose a little response as it builds boost and gain a little as you let off and the hose shrinks to it's non-pressured size, this likely is not enough to affect seat of the pants feel.You should have one or two short hoses minimum to allow for movement and avoid metal fatigue, they will also dampen the shock to other parts, much like an expansion tank does on every hot water system. The trickest, lightest charge tube would be Carbon fiber tube with Blue silicone hoses at joints and bends if the carbon is not molded to fit.
That is correct. Also at high altitude those tubes expand a little more because of 4.5 psi less air pressure (at 10 000 feet).
But Aluminum tubes heat soak more and transfer engine bay heat into the pipe. insulated aluminum tube would be great.
Hence my preference for Carbon Fibre for the most decerning owners / customers who are willing to pay the up charge for the ultimate in weight savings and performance.
I don't think anyone will claim to be able to "feel" silicon boost hose expansion....at least not without ridicule lol. In theory that is all correct, but real world is I will take the lack of heat transfer from the silicon with whatever expansion deficiencies it has. My MCX kit on my Apex had a longer hose than that and it didn't seem to affect my mediocre riding 320hp at all lol.
I personally run stock rubber hoses but a larger intercooler in my Stock turbo'd race machine at 33 psi of boost (max boost).
They expand, but it does not significantly hurt power output. There are other bottlenecks more important in the system:
Here is the machine in action:
http://www.youtube.com/watch?v=IpbIWjLqigU
http://www.youtube.com/watch?v=Z-Z55AcboW4
They expand, but it does not significantly hurt power output. There are other bottlenecks more important in the system:
Here is the machine in action:
http://www.youtube.com/watch?v=IpbIWjLqigU
http://www.youtube.com/watch?v=Z-Z55AcboW4
The Evo silicone hoses are made from very high quality material and engineered to take more boost than you will ever put through them on a sled. Price is great too. As said aluminum is tough but will transfer a lot of heat. Rubber hoses are a bad idea if you increase the boost level. I couldn't keep rubber tubes on my race car, you couldn't tighten them enough to keep them from blowing off. The rubber hoses from the intake side of the turbo to the air filters would collapse and cut off the air flow too. You could see it just revving the car with the hood up.
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Evolution Powersports
Well-known member
We chose to make our boost hoses out of silicone for the following reasons:
- Silicone has been proven in very high boost applications
- One of the biggest issues with the 1100t is intake air temperature. Aluminum charge tubes make this worse by transferring heat from the engine compartment to the tubes and therefore to the air charge. Aluminum is great for heat transfer, but not in this situation.
- Using full length Silicone Hoses has more of an advantage than drawback. There are only 4 clamps. The connecting points are always potential failure points. Most aluminum tubes have many more than 4 connections.
- We supply our charge tubes with Tbolt style clamps which have a much greater clamping ability than the factory worm drives.
- Part of the reason you see movement in the BRV video is the intercooler is not secured the way it would be if it were in the field. We keep it loose for easy removal while testing. Yes the hoses grow slightly under pressure, but not enough to make any difference in the reaction time. There are no detectable adverse affects.
- Our reinforced silicone hoses are much stronger than the factory hoses
- We had issues with the stock hoses coming off at stock boost levels in the mountains. We have never had or heard of anyone who has installed our tubes and had them come off
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What about overtime running higher boost will the tubes eventually either stay stretched and loose elasticity or begin to crack and wear out du to heat stress and continuous explanation and contraction. Not tryin to slam or put down. Just wanna get all the facts cause everyone says something different to say or SELL have u tested them on a against factory and aluminum to check for A: HP improvement B: charge air temp C: pressure difference or volume.. In the heavy equipment field a lot of high pressure lines have a metal coil over them to help contain pressure and keep hoses from expanding and rupturing,
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Evolution Powersports
Well-known member
Mike,
(A) We have not claimed a hp increase with our charge tubes - only that they are FAR stronger than the factory hoses. The reinforcement in the hoses is the same material snowmobile belts are made from. We have also claimed that they will not pop off like the factory ones - especially with our clamps.
(B) it is common sense that aluminum will transfer heat better than silicone rubber which is an insulator. 1100T's are plagued by under hood heat problems. Although we like to test everything to the nth degree, we felt that this was so obvious as to not need a test.
(C) Yes, we did test against aluminum tubes and the pressure difference is not discernible by a boost gauge.
We have had many years experience with silicone charge tubes on cars that have set and still hold world speed records. It is a good product.
Regarding silicone hose, please read the following:
Silicone rubber has historically been used in specialty applications in order to meet requirements other elastomers cannot. Silicones have the largest application temperature span of all rubbers (-120 F to +500 F, with one or two exceptions where highly specialized and costly Fluoropolymers can compare).
The chemical structure allows Silicones to be the most benign of all rubbers in medical applications (again, the exception are some very costly Fluoroelastomers). Cytotoxity tests of Silicone parts made with simple formulations show no adverse effects.
The US military applies the longest shelf life criteria to Silicone rubber components. For example, a coolant hose made with Silicone meeting SAE J20, is given a shelf life of 20 years, whereas those made with chloroprene rubber meeting SAE J20 are given a shelf life of 8 years.
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