The wonderful after cat turbo .. I know this has been talked about a few different times and i know there are a few people on here that have either done it or at least has experimented with it. Now there is irrefutable evidence that these things actually do work and I would like to try it sometime this summer. Now STS Turbo can make them vehicle specific utilizing the mounts on your vehicle, or you can get the universal kit for about $2000. It just seems to me that it would be much cheaper to fabricate your own. I mean the turbo goes under the vehicle there is no reason that you couldnt just get a used turbo off of a vehicle at the junkyard or from craigslist, as long as you make sure its good. It dont have to look pretty, it just has to work ( it only has to be capable of building 5 to 10 lbs of boost ) .. you can get them for a few hundered dollars. As far as the fabrication goes, it would only take a minimal understanding of basic tools to do it. The only problem I can find in building your own is trying to figure out what size turbo you need to find. In my personal case, my truck is a V-10. Anyone have any ideas on around what size ( or off of a specific vehicle ) that I would need to start looking for ?

 

Try to find a turbo off a diesel pickup, this is about the only "single" turbo I can think of that would be large enough(in a junkyard anyway). You have to custom fabricate the boost tubes to get the air back up to the motor. You will also have to get oil from the motor back to the turbo. And harder still, you have to get the oil from turbo back up to motor. Once the oil leaves the turbo it is no longer pressurized. In typical installations, the oil is fed back to the engine via gravity. This will not work for you. You need some sort of collection area for the oil and a pump to pump it back to engine. It can be done and is fairly straight forward, I have custom fabbed a twin turbo kit for a 5.0 mustang. 14 pounds of intercooled boost into a stroked, aluminum headed, cammed, 3.73 geared, 3100 pound car is a crap load of fun!

 

If I would spend the time and effort to put a turbo system on my truck it would be under the hood with a 6.0l intercooler. I'm not a fan of under the truck turbos but that just me I guess.

 

Underhood has it's drawbacks too. Lots more fabrication of the exhaust side involved. Need new exhaust manifolds, or somehow route the exhaust from stock manifolds up into engine bay to turbo. Then gotta get exhaust from turbo back to your stock exhaust system. Sure makes oil and cold side plumbing easier though. Underhood temps will rise also with an underhood install. Either way don't forget about fueling of this thing. Motor is gonna need alot more fuel. Normally aspirated engines typically run at an air/fuel ratio around 14.7 to 1. This is considered the stoichometric ratio or optimum. Under boost you want it much richer to ward off detonation and cool cylinder. Gonna need bigger fuel injectors and fuel pump, most likely. Gonna have to fool the pcm also, it is going to always try and achieve 14.7 to 1 fuel ratio. They do sell some fuel pressure increasing devices that work with the fuel pressure regulator, but these are for return style fuel systems. Don't know what the v10 has. May need a hotter spark to ignite the increased cylinder pressures the motor will see. Aftermarket ignitions system or better ignition coils. Lots of things to consider so your motor doesn't go bang and then come to a stop! Will HAVE to run 93 octane too.

 

On the stock V10 I would stay around 5lbs. Your going to need larger injectors and a pump to supply them although some kits in the past used a boost a pump. Stock ignition should serve you fine as long as it is in good shape. Unless you have experience and the software to tune the truck properly you are going to have to get a shop to do it. Best bet is to get the truck on the dyno and tuned that way. If you run stoich all the time with a force fed V10 you are going to melt it down and get detonation out the wazoo. Got to go rich or go home.

 

Agree, a Kenne Bell boost-a-pump, might get him around the bigger injectors/pump. Maybe. v10 probably has powered metal rods with cracked caps and cast pistons. Not the best set up for forced induction but can live with GOOD tuning and low boost. I would research the holy $%!^ out of this before proceding! I spent probably 6 months on various mustang and turbo oriented forums before jumping into actual fabrication.

 

Try this thread. clicky here

 

thanks for all the help guys. If I do happen to do this it wont be for a while anyways so I have plenty of time to research everything. Thanks again.