has anyone attempted to take a turbocharger and turn it into a belt driven turbo/supercharger? i want to try this by taking the casing off of the back of the turbo and adding a pulley and custom bracket to bolt it onto the engine where the original air pump was located. everything will be welded and very strongly secured. i am hoping to get around 8-10 psi from this setup. i will be using an air/fuel controller, msd ignition system, blow off valve, boost controller, oil filter adapter with oil lines for the turbo/supercharger, and maybe larger fuel injectors at some point.

i will be putting this setup on a 91 s5.

leave me some feedback on this thread and let me know what you think and maybe some suggestions and/or additions to this setup.

thanks!

 

Why not just fab up a centrifugal supercharger set up?

 

how would i go about doing so without spending a ton of money? give me some ideas to work with. my goal is to be boosted by the time spring comes around...........track time, you know.

 

huh?

 

You gotta pay to play. Period.

Many will flame you, but I think it's actually an interesting idea. Meaning building the actual supercharger via modding a turbo charger. The trick though would be having it perfectly balanced.

 

Just do a turbo swap.

 

is a turbo compressor higher compression than a centerfugal supercharger?

 

That would be a pretty cool unique idea

 

How are you going to get the turbocharger spinning up to 50,000 rpm+ ?

 

finding the smallest pulley possible would be a start. other than that, i am going to try to come up with a gear system enclosure for the actual spindle of the turbine.

 

if you have to ask...

 

I'm not good with gear ratios but how I understand the basics, doing a straight pulley system might be harder than fabricating gears that work efficiently. Lets say you have a compressor achieves full boost at 100k rpm and you want full boost at 4k rpm. We would need to find a way to bring the engine's 4k rpm up to 100k+ rpm that a compressor requires. That would equate to a 1:25 ratio. Let's say a compressor's pulley wheel is a single inch big. To get that compressor to spin up to 100k rpm at 4k rpm (engine), you would need the engine's pulley to be 25 inches in diameter. Having such a big pulley under the hood sounds a little impractical if not impossible. Although these numbers aren't true values, they give a good concept of how impractical having only two pulleys could be.

You might be able to get your hands on a centrifugal supercharger drive system and modify that to fit a turbocharger with the turbine removed... I don't know, I guess it's easier said than done.

Why not just go 6-port turbo using S5 TII parts?

 

Read Corky Bell's "Supercharged!" book so that you will at least have a clue before you start your project. You can get it from most online book sellers like Amazon.

And no, a simple pulley and thin stock-type fan belt will not work.

 

Why?

 

Props for dreaming, but unless you have some serious knowledge of machine work and access to mills, lathes, etc.... even then you'd probably end up with the project in the garbage can. You'd have to enclose the turbo, gear it using planetaries such that the belt can spin it at the same speed a turbo would spin to create boost, and for each shaft you'd have to create bearings that can support axial and radial loads. Even then, you'd have some issues with making bearings that can handle spinning 50k rpm+.

I'd recommend letting the professionals design compressors. Don't want anything coming apart and entering your engine, right?

Practical power doesn't really exist. About the cheapest you can get is buying TII intake manifold, TII exhaust manifold and turbo, and everything associated for fuel/spark concerns. You can't just slap on a turbocharger and expect the stock naturally aspirated ecu to supply enough fuel and control spark properly. For all that you'd need a TII ecu, AFM, boost sensor, etc. Just look at Aaroncake.net He explains in full painstaking detail about turning the N/A engine into a turbo.

 

Sorry bud but you have to wake up,stop dreaming and get back to reality.You want boost?do it the right way.Is not that expensive to get S5 turbo parts and do the whole turbocharger NA thingy is well documented on this forums.

 

It has been said using the available turbo parts & the knowledge provided on the forums should help you get boosted by spring & at the end of the day you are not playing the guessing game. Used turbo & superchargers can be found for decent prices. Basically you want to build your own centrifugal, I suggest you just hunt down a used one.