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The same principle is used in the hidden f-body kits they make for 4th gens. The turbo is just as efficient as a motor mount, and actually does not need an intercooler because of the length of the compressor tube. The air actually gets cooled more (on an f-body) through that long tube than an intercooler would, and you also do not lose any boost like with an intercooler. The turbo runs cooler as well since it is not subjected to engine heat, and it is out in the open. The downsides are rain and the amount of dirt the filter gets due to being behind the rear tire. The f-body kits come with a "sock" (like they run on dirtbikes) to protect the air filter from water and large debris, and you have to clean it like every oil change or something. The f-body kit is called and STS turbo kit, you can check them out online.
You'd think that with the length of that compressor pipe it would cause problems, but according to what I've read, once the pipe is pressurized it doesn't lose any pressure. The test cars they've run show something in the neighborhood of a tenth of a second or so difference in pressurization times between the STS turbo and an underhood with an intercooler. Turbos run 400 degrees cooler, and intake air temps are like 20% cooler than an intercooler-style turbo. Not to mention you now have significantly less underhood heat since the turbo isn't in there cooking everything.
The problem with that picture is the wire tie. That is NOT gonna last but about 1 second in the real world. That intake pipe would get so hot it would melt that wire tie, or the vibrations would break it. That looks like a mock-up installation and not what it will be when finished. The turbo would also melt the tail section because there is no heat shield. Good theory, and it will be interesting to see what it looks like when completed, but I wouldn't have those shoddy pics online advertising my product. And Lord knows you ain't riding that bike around town. You better get a 20 over swingarm to keep that sucker on the ground
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Q.) What type of tuning is needed with this setup?
A.) Most of our low boost (2-4 psi) turbo kit's are designed to run without the need for much additional tuning. However, we recommend that all bikes that have the turbo installed, also purchase a power commander to ensure the Air/Fuel mixtures are correct. We are also working on power commander mapping to help with your tuning needs. "
There is VERY little boost lag due to the length of the pipes. You have a defined amount of air in a distance with hard walls. The lag difference between that and one that is header mounted would be measured in tenths or hundredths of seconds. The boost lag is because of the turbos they use (too big for one thing and probably not dual ball bearing like the popular ones). That turbo is overkill for a bike. The one on a Nissan SR20DET isn't even that big, and those things can put like 250 to the wheels in a car which has a LOT more line loss than our bikes.