First is my set up
87 Camaro Z28 with a 305 recently rebuilt 2010 spring. She was bored.030 over with a very mild Comp cam (I can look up which grind if you would like to know), the crank is .010 under, hypereuretic pistons, all new bearings rings the whole works. Also has Hooker headers and a 3 inch y-pipe no cat. Currently stock exhaust, but soon to be 3 inch Hooker Aero Chamber cat back. Porting is also going to be done. If I am able to pull this off like I want to, I plan on siamesing the stock runners (yes welding aluminum to make one big tube), and also porting the plenum and intake.

Now my idea
I would like to hook up a rear mount turbo. After doing my research I have seen a lot of these hooked more toward the end of the exhaust. I was thinking not to lose so much of the exhaust heat, and to keep it hidden the turbo could be placed where the cat went. If that is good or bad let me know. The piping for the cool down pipe (I believe that is what is called) would be kind of hard to fab out of that area, but could be done, or least I think so.

The equipment

Obviously a turbo, but I am confused on what size. I have researched, and have heard a T-70 is too big, but a salvage from a foreign car is too small. Again if anything I say is wrong please correct me. Also a lot of the turbos have a 2.5 exhaust intake. Do they make a 3? I have read that some people are running 5-7 boost, and then I have also read that others are running 12. Which one would I be better off going with. I am a college student so money is an issue. Not saying I want a cheap ebay turbo could implode and toast my whole engine, but top dollar is out of the subject.

And now the oil pump
I have looked this up and have seen several ideas for one to use. Only question I would ask about this is does anyone have a recommendation?

Oil Lines
Sounds easy enough tap into oil pan run to oil pump than to turbo and back to oil pan.

Piping
All the piping I would be attempting to fab up myself. Getting a mig welder this summer, and if all else fails my father has some hook ups. I think this would be the hardest part of it all.

Tuning
I don't know a whole lot about this, so I might have it tuned by a shop. Or depending how adventurous I get I might attempt it.

Others
I have read that the #24 injectors would work. But have also read that I should get the next step up.

If I am on the right track give me a thumbs up and maybe a low dollar that this could be done with. If some is wrong some is right please correct me. And if I am totally in space shove me in the right direction. I would like to keep the 305 and just give him a little more chest hair if you know what I mean.

I am thankful for anyone that replies.
Thanks a lot, Chris

 

I'm not a huge fan of rear mounts but they do work pretty well. The problem I keep seeing with them is the return oil pump system. The pumps are either expensive or unreliable, or both.

Regarding trying to mount it in the cat location.. If you're going to mount it anywhere other than rear, it needs to be in the engine bay. Since you're on a budget, this eliminates an expensive (and often unreliable) return oil system. You'll also save money on numerous pieces of pipe you'd need to send the charge air up front.

Sizing of the turbo will depend on many factors, but generally the turbine size (relative to the particular requirements of the engine) will need to be smaller as you move it further from the engine. Compressor size will stay the same. If you were going to rear mount it, or even front mount it, you will want to keep the exhaust tubing between the engine and turbo relatively small. For example a 2.5" cat back for a rear mount. This keeps exhaust velocity higher which turbos like.

You could do fairly simple front mount, non intercooled 6-8 psi system with an Ebay turbo fairly cheaply. It does add up quickly though. Here is a breakdown of my front mount single turbo build costs: http://www.mentalsocket.com/Iroc87/turbo2.html

 

I saw talk about the oil piping for a rear mount turbo.

Could a person fab up a dedicated oil system for one, that mounted in the rear & used an electric pump? Out of the turbo, through a rear separate cooler, then back into the turbo, all mounted in the rear area.

 

Maybe look into the newer air cooled ball bearing Turbos from precision. Ball hearings would help a rear mount immensely. I don't think a 70mm is too big for 350 cubes. Maybe do a GT35 if you think it is.

I don't think a cat area mounted turbo is a good idea unless you want to make a bigger hump by the passenger feet area. There isn't much room there for a good y pipe let alone a turbo.

 

jus spring for the return pump .lol

 

Well I like the idea of a rear turbo because it keeps the engine bay clear. And thanks for the input on the cat location. That was just a thought I had. And ZZ3Astro that isn't exactly cheap. I was thinking the most expensive stuff I would have to buy is just the turbo and the oil pump.

 

I don't see why a cat mounted turbo would be a bad idea, hell even the callaway corvettes did it back then. Just a matter of managing your pipes, maybe even a twin setup with the smaller turbo's would fit better. If I didn't buy my blower way back then I would be all over this stuff.

For your injectors I would go bigger, 36Ibs+ then you have room to grow little. Tunning will be a pain though, you will need to go aftermarket or learn code59, unless you want to go the FMU route.

 

Turboing is not "cheap" unless you have good fab skills, and even then it's not very cheap. Also, those hyper pistons aren't going to like anything shy of a perfect tune

 

Well that is the thing I plan on fabing everything up my self. I think it will be a lot easier to fab up a rear turbo, than a front mount turbo.

 

I agree with you, I think I am going to be doing a Rear mount someday in the future. Not sure exactly when but I would definitely like to!

 

So by fabing everything up my self, and not having to buy a whole new set of exhaust manifolds, or an IC I think I will be able to save a substantial amount of money. But anyways, back to the original question. Do I have the concept/ components that I will need? Some one that has done this before give me a thumbs up or something

 

Mounting one where the cat goes just isn't going to work, there isn't enough room...

As far as do you have the "concept/components..." you don't list anything besides injectors that will be much too small if you build any kind of decent power, not sure what you want someone to say...

 

That is a common myth that just the pump and turbo costs the most. Add up the cost of silicone couplers, T-bolt clamps, good fuel pump, ECM/ECU equipment, fuel injectors, etc and you soon find the turbo and pump cost is just 10% to 50% of the complete system.

 

O wow i never look at it that way

 

If you want fast and cheap then go with a front mount. Weld a box onto the pass. side manifold that holds the turbo and acts as a merge for the drivers side. Then block off the existing pass. side hole. Change the y-pipe to enter into the new box you welded on. Cost about $20 in steel.

Fab up an oil feed & return, a short charge pipe and dump pipe. Spray extra fuel with a N2O fuel solenoid. Then go fast for cheap.