I would get the biggest automatic transmission cooler you could find and mount it in front of your radiator. Then you hook your hot water return from the aftercooler to it and then the cold water return from the trany cooler back to your reservoir. I used an electric sprayer pump from the local tractor supply, it has a high duty cycle, flows like 6gpm free flow and only costs $80. I doubt the flow on the heater pump is probably even over 2gpm, but I could be wrong. Where are you going to mount your water tank in the trunk?? I guess your other option since that core is so big as you could fab it with a large shell so that it held the most water you could get in it and still make it fit. It could be your reservoir and cooler, then you could use the trany cooler to help prevent it from getting heat soaked. A good air to air would be simpiler, we just need a longer front end to make it fit and look nice. Anybody know if the dimensions on a W116 front end are close enough to a W123 that the hood and fenders could be bolted on. Just by looks it would appear that might gain you 4" or so. Of course the wheel well probably wouldn't be right. Just dreaming..............................LOL

Nope.......the W116 is a totally different beast....and about 6 inch wider....something you will really notice if you take off the turbo and manifolds....a royal pain with the W123 in my opinion....something that is far easier do to the wider bay of the W116.

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

I would say for not wanting to cut up the car and still have the AC and stock fan stuff, air/water is easier (there is just so limited space to run piping!

I'll probably mount the resiviour on the other side of the engine bay (plenty of space over there) I am still looking for a nice sized cooler to put out front. Mabye there is something in my boxes of helicopter parts.

I looked and looked and thought about it for awhile and finally decided that air/air was just not what I wanted to do with this. With all working AC compoenents and no desire to start mounting up electric fans, I think this will be a very reasonable route .

My goal is to use the stock air-cleaner (slightly modified)

Thanks for the confirmation Doc. I really didn't think it would even be close, but it was a nice dream anyways.LOL I looked at air to water and air to airs and I didn't think there was enough space to really do either of them well so I am going to just use water injection instead. I know water injection well and it will keep things cool and makes a nice power increase. Wish there were som diesel benz's in the bone yards around here as I would really like ro pick up some manifolds and a junk turbo cheap. I think if I had those to base off of I could build a really sweet water jacket intake for a clean install. Maybe have a custom double cored radiator built. The new deere tractors use a water jcaket aftercoller with a split flow cooling system and it works well.

I picked up my manifold off of ebay for like 15 bucks (intake)

I also have another turbo, though the one on my car is modified so I want to take care of it

I thought about water injection but since the w126 body has a lot of space (with the I-5) I figured I'd try this out first. That way I have more options later on when I want more power

Sorry for the long time. Maybe you don't remember. I have a 300D turbo OM603 and want to get 10 seconds. How did you get that time? With AT just wot? Or did you manage the shifts manually? What mods have you made from Factory settings?

Thank you in advance,

OldBeaver

The 300D turbo OM603 should do 0-60mph in 10-11 second in stock form, if it's running properly. No need to mess with upshifts, just make sure it's shifting at ~4800rpm for each full-throttle upshift. Otherwise, turn up the full load and keep an eye on EGT's, and make sure the ALDA is adjusted correctly.