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-   -   Thinking of putting turbo on 3.0 big bore with twin plug, comments? (

dzlndan 06-01-2014 05:18 PM

Thinking of putting turbo on 3.0 big bore with twin plug, comments?
Recently purchased a 1982 Targa 3.0, I was told with big bore pistons, twin plugs, dual MSD, it has a very bizarre twin distributor set up. I have purchased all the components to put the stock 930 turbo setup on the engine. I realize not lowering the compression ratio might create some problems. But I wanted to get some comments from the experts before I make the plunge.

Couple extra questions I have are:
- if I keep the twin distributor running a belt off the cam where the scavenger pump goes, can I use a electric scavenge pump? Good/bad idea??
- if I keep the boost low will this navigate around the detonation complication?
- if it doesn't work right, what would be my worst case scenario, would this destroy the long block?
- If there would be weak component would it be on the top side or should I be concerned about the crank/block?

Les Paul 06-01-2014 06:21 PM

Where is the twin distributor?

jess p 06-01-2014 06:55 PM

I think you need to get it running first before you spend any money on mods.

dzlndan 06-01-2014 07:15 PM


Originally Posted by Les Paul (Post 8094160)
Where is the twin distributor?

To the rear and left of the left weber.

dzlndan 06-01-2014 07:18 PM


Originally Posted by jess p (Post 8094214)
I think you need to get it running first before you spend any money on mods.

It runs awesome. Neck snapping quick. Just doesn't look so pretty! Hehe:D.

When I drop the motor I'm going to clean everything up and touch up with paint.

lite75 06-01-2014 07:20 PM

now that is a very strange setup indeed...

dzlndan 06-01-2014 07:27 PM

930 turbo parts
Here are all the 930 parts I have to make the turbo engine complete.

Tippy 06-01-2014 07:43 PM

I'm not up to speed on the 3.0's but I'd imagine your crank, rods, and block will take just about any power you throw at it. I do know it has bigger rod bolts over the 3.2's, so a little safer for higher RPM's.

Ronnie's.930 06-01-2014 07:47 PM

Here are some potential problems and things needed :

1) I am fairly certain the 930 distributor will not work "as is" on your 3.0 engine - 930 dist., turns counter clockwise, and the 3.0 turns clockwise (right?) - if so, you would be looking at opening the case to replace the distributor drive gear, so I don't imagine you want to do that.

2) Do you know for certain what the compression ratio is on your 3.0? I ask, because when people add a big bore kit, the new pistons are often a higher compression variety, so if they are (say in the range of 10:1) you do not want to add a turbocharger to that (even with low boost).

3) Are the headstuds Dilivar? If so, check to see if any of them are broken.

4) What transmission do you have (a 915?) - those don't handle turbo power very well (and/or not for very long).

5) How long has the fuel head been sitting around open to atmosphere like that - if for very long, it is probably very gummed up inside with dried fuel and will need to be overhauled/cleaned - same deal with the WUR.

6) How does the OEM intercooler attach to the throttle body since the secondary manifold (diverter valve housing) is missing and you have the aftermarket BOV setup instead?

7) You will need to run two, very powerful, 930 style fuel pumps between the tank and the fuel head to have adequate fuel pressure (just under 70psi continuous) for the turbo K-Jetronic/CIS system . . . the one currently on there for the carbs won't work. And you will also have to have a fuel return line that runs from the fuel head to the tank.

8) You will likely have to buy 6 new mechanical CIS turbo fuel injectors (very expensive) as they are probably effed up with dried fuel and moisture from atmosphere.

9) You will need to add a turbo oil drip tank to your parts above so that oil does not sit in the turbo bearing cartridge and cause coking problems after shutdown.

* Yes, some people on here have used electric scavenge pumps with success. Some have also simply drained the turbo into the sump, but others that have tried this have found it to be inadequate.

* You would need to plan on installing an onboard air-to-fuel ratio meter so that you could tune the fuel system after it and the turbo setup were installed.

JFairman 06-01-2014 09:20 PM

If the wastegate and scavange pump are good you could sell all that other junk and EFI the motor. Might be easier and would run a lot stronger.

There's a market for all that obsolete emission smothered CIS stuff.
Kinda looks like someone tossed it and had a garage sale.

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