Recent content by Gary Evans

Your right it doesn't because A BOV and wastegate serve totally differant functions. There is a PopOff valve which is just a spring operated valve to protect against overboost but you don't see many in use on bikes.

Greddy Type S

Unless either what you need isn't available or you just enjoy fabrication I would also suggest buying off the shelf. While it is possible to build a better system few individuals have the where with all. Everything you need however can be learned and it is very special to have done it yourself.

The correct way to size the turbo compressor is from the compressor flow map using your engines flow specifications. You pick your target HP and use math to plot where your requirements would fall on the map. See the last two threads in this section of this link. http://tinyurl.com/6rgwo There...

If you want the least boost possible adjust the rod so that there is just a slight amount of spring load holding the wastegate valve closed. That should yield about 8lbs at medium rpm but you still will have wastegate creep at peak rpm. Creep is when the wastegate is wide open but the exhaust...

Do a search. There is a video by the inventer.

If the fan and turbine were originally balanced as an assembly the correct method is to rebalance after rebuild. Do you have to? Of course not but like everything else there is usually only one correct way to do a job. Some times things done the wrong way by short cutting will provide an obvious...

Here is a compressor map. I've had it up to 380hp @23lbs (water injection w/o intercooler) and it is capable of 400 pushed. I normally run it at a streetable level of 15lbs/300hp.

Being a couple of degrees off on cam timing would not cause this condition nor would fueling if its close enough for the bike to start and idle. The first thing I would check is valve clearance and cam timing to see if its off a tooth or more. If that not the cause/s then you need to run it on a...

Base boost (1st, 2nd) is 8lbs but that will creep up at high rpm. 3rd is 10lbs, 4th is 12lbs and 5th/6th is 15lbs. 1st and 2nd are too violent to drive all the way through with the stock swing arm and 3rd/6th levels were selected to stay just below a wheel stand. Boost control stages are...

While in theory multiple boost stages with a FMU may not produce perfect fueling in all stages in practice it works fine. I run 4 stages using a Vortech FMU. Mapping was all done using the last stage. Since the fuel pressure increase is linear with the FMU there is fuel taken out in the lower...

I have run them max'd out to just over 300hp. There is no set limit on what you can run and the risk just increases as you go up. That said I believe 275 is a reasonable limit.

Super 16G compressor manifold pressure goes positive at 3000 and is at 10lbs by 5000. Perfect turbo for street use.

Good choice! Off boost they run like a stock bike. I have over 20K road miles on my turbo. Many weekend trips and twice to Laguna Seca from Phoenix.

I would center it if possible but it doesn't matter.