Lets talk highflow

[Turbo11T]

So. . . Doing some research alot of the aftermarkets are claiming 4-5hp with aluminum charge tubes even at the stock hp level. So what are your thoughts to this? I would assume that with the boost turned up or at elevation where boost will be higher because of the the altitude compensation that the number may be even more.

 

[0neoldfart]

Re: charge tubes

I am inclined to call BS on the charge tube hp gain - the biggest benefit would be better clamping then the stock A/C unit. I purchased a set of speedwerx charge tubes recently, and although they are pretty on the outside, the inside welds are of very poor quality and would create turbulence in my opinion. Too bad I had to pay for them up front before I saw them.
On the other hand, I bought a set of silicone chage tubes from Boost It on the forum (made by evo powersports), and they are well thought out, and look like a quality product. Hope this helps

 

[Turbo11T]

I am inclined to call BS on the charge tube hp gain - the biggest benefit would be better clamping then the stock A/C unit. I purchased a set of speedwerx charge tubes recently, and although they are pretty on the outside, the inside welds are of very poor quality and would create turbulence in my opinion. Too bad I had to pay for them up front before I saw them.
On the other hand, I bought a set of silicone chage tubes from Boost It on the forum (made by evo powersports), and they are well thought out, and look like a quality product. Hope this helps

Some of the claims I have heard is that the stock Charge tubes create a bottle neck at the throttle body? I would like to do a set of charge tubes made from one solid peice mandrel bent. Should be able to eliminate any imperfections on the inside.

Also Another high flow area. The downpipe. The turbine wheel is only about 2" dia. So dumping out of that into a 2.5" downpipe directly would create turbulence. Would a guy be better off with a tapered from 2 to 2.5 and drop the divorced wastegate in nearest possible to the 2.5" section. This makes alot mor monkey business.

Flow is definately extremely important in making a efficent system. With the stock charge tubes you go from like 1.75" to a 2" charge tube then back into a 1.75 intercooler. Then back out of the intercooler at 1.75 into a 2" charge tube then back into the throttle body at a smaller diameter. I would think that changing this to stay consitant would yeild the kind of gains claimed.

 

[Jimb]

Unless you ride low elevation everything you do is limited by the stock turbo, if you have a 2.0 box on it then the charge tubes, divorced waste gate etc is a waste of money if I'm not mistaken.

 

[Turbo11T]

I agree and disagree, Putting a Hyjacker on and turning it to say 200 hp is not going to run as consistant as a sled with full 2.5 exhaust anf charge tubes. The hyjacker will have to take the turbo up into a pressure range where it just physically can't flow enough air.