For a long time now I have been interested in putting a turbo on a slant six, if anything just to be different. I have already been doing some modifications to the Slant in my 74 Duster. Its a rebuilt 225 slant six block, rebuilt head, mild port\polish, mild head shave (approx. 8.75to1 compression), a Comp Cams camshaft @ 264/264, Lift .440/.440 (freebie from neighbor!) all topped off with an Offy 4bbl intake/390 Holley and 6to1 ceramic coated headers. I think its already going to be a pretty healthy slant six.. maybe a little low on the compression side of things but thats why I am interested in turbo charging. One if the big problems I am facing is the fact that I am fairly hooked on the headers, I like the look and I paid a decent price for them so I want to use them. Because I want to keep them I have been doing some reading on this site and some other sites about doing a Rear Mounted Turbo. The concept is a strange one, but it does seem like it has a lot of potential in a street car. I like the ideas of seriously reducing under hood temps (on average around *500), using ambient air to cool the charge as it returns to the engine, plus the cool ass sound a turbo would make! ha ha. I have read the oil\cooling issues could be a problem but I don't think it would be too complicated to solve, something like a simple feed and return line with an electric oil pump. How ever in all my searching I haven't been able to find any one who has done this set up on a slant six and especially a slant six in an A-body. I understand the basics of a turbo, installation and design but I have never done anything like this before so I have a lot of gaps in my knowledge.
What I would like to know is,
-In this type of rear mounted application would it be better to use a larger or smaller turbo? I have access to a turbo that came off a 2.3l 4banger or a 3.8l V6 or is there something better?
-When putting a turbo on a Carb. application, what sorts of things, if any, need to be done to the carb before it will work with a turbo?
-Does my engine combination seem like it would be a good with a turbo set up?
-I was thinking I could mount the turbo some where around where the stock muffler used to be located, do you think there is enough room in the rear of an A-body for this type of set up?
-Any other thoughts or comments? Or am I just crazy?

Any ways, sorry this was so long, I just wanted to make sure I got all the ideas out. Thanks a lot for the help\thoughts guys!!

--Nick

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Just Another Mopar Fanatic... Nick

Previous thread on this topic here.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

There is a great forum to find answers to most of your questions at www.theturboforums.com
You will be able to find someone using the remote turbo setup and they can help you size the turbo for your application. A T3 off a T-bird Turbo Coupe is going to run out of boost at a low RPM.
If you use this site's search feature you'll find that there has been a few discussions on turbos.

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Chris'
Autobody
Restoration
Service

The rear mounted turbos were pretty much invented for 4th generation F-bodies, which have very little room under the hood. On a slant six, you've got a lot of room under the hood, but very little room under the car or out back to mount the turbo. It would be less work to do an underhood mounted turbo with some sort of up-pipe from the headers, and put a flex coupling in there so the headers don't take any of the turbo's weight.

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"Mad Scientist" Matt Cramer
'66 Dart - turbocharged 225
My blog - Mad Scientist Matt's Lair

Rear mounted turbos are pretty much designed for what Matt said. You have a decent set-up for one on your engine with a little bit high on the duration of your cam. However, the rear mount turbo would be fine for this engine as they are dead in the water for anything above 6-8psi of boost. Since your engine is already pretty set-up for this it would be a good expirement to try if you want to. But an underhood application would be more beneficial if you plan to push this idea any further ie more boost. Also, you'll have to re-jet the carb with some special stuff or get a 500dp already set-up for this. It's how far do you want to push the boost and how deep are your pockets?

You could sell your ceramic coated headers. I wouldn't base a turbo design on a set of headers that dump out low like they do. There is so much room on the manifold side of the engine bay for an efficient custom manifold design. Use a small late-model mini starter and put the battery in the trunk - tons of room that would be the envy of most.

How about a little shot of nitrous oxide/fuel mix into the compressor inlet on an above 5 psi boost signal for an intercooler instead of all that air-to-air intercooler plumbing on the non cross-flow head. Just a thought.

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'63 Valiant V200 Convertible
225 Aluminum Block

Nitrous is kinda expensive to use as a coolant. I thought about it, but the figures suck. If you don't want to run an intercooler which I wouldn't bother for 8psi, just run water injection....
Honestly with your engine you would probably be better running a 100hp shot. Just a suggestion.

Do a rear mount!

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

look for www.ststurbo.com



the only thing i see wrong with a turbo under a vehicle would be water..

you can run the intake up into the engine compartment or whereever to get it up out of the way, but if a turbo that was hot kept getting quenched by water that couldnt be good it..