Ok,
Finally got around to starting on turboing the 3b in my 1985 CDM BJ70 (340000km) and am looking for some advice from the mud guru's:
Here's the plan:
Have a AXT manifold for a 70 series - 3BII which I had machined to work with my 3B (random craigslist find)
Have a water cooled Turbo from a Vovlo, came with the truck when I bought it. 0.42 / 0.48 AR numbers. Air Research - seems to be a good match to a 3B from my research.
Will be rebuilding the turbo.
Oil supply for the turbo from the oil pressure switch location.
Oil drain back into the lower banjo bolt on the oil filter housing - is this OK, i've seen a number done this way and a number done straight into the pan - would prefer not to have to drop the pan and weld a bung into it - whats the MUD consensus on this one? I can drill the banjo bolt out for more flow and tig a nice large diameter fitting onto it.
Water in/out pretty straight forward - will show some pictures later this week when i get that in.
So my main questions for you guys are?
1. While I have everything torn apart what sort of preventative maintenance should I be doing on this 3B. Should I replace the head gasket considering I'm almost there? Anything else I should be looking at. No idea on compression numbers. Should I replace the engine mounts at 340km?
2. Specific 70 concerns - I know I need to move the power steering reservoir, and am considering replacing the stock sedimenter with an aftermarket fuel/water filter separator and moving away from the turbo's heat. Might also move the vacuum reciever while I'm there.. Anything else for a 70 I should be worried about?
3. Turbo - any chance that I can run this unit without a wastegate because it is so small? I could sure use the room to make the downpipe just with a flat plate and then a close elbow - instead of using the stock exhaust / wastegate collector device that came with the turbo. How about using a flat plate that has the separate wastegate port and just prepare a pipe section so I could run an external waste gate if I need to? Or should I just make it work with the stock exhaust housing.
4. Exhaust - plan is to run 3" OD stainless straight pipe with no muffler. Will this be too loud or OK? And on the 70 any concerns about running it alongside of the transfer case instead of outside of the frame rails? The outlet diameter of the turbo is about 2" ID at the point it leaves the turbine housing, so I was thinking of going from the exhaust weld plate to a 2.5" close 90, then concentric reducer 2.5-3.00" immediately after the 90 and then run 3" the rest of the way with a expansion chamber between the frame mounted sections of the exhaust and the engine mounted sections.
5. Gauges - any cool photos for gauge installation in a 70. Was planning on going electronic oil pressure, water temperature, mechanical boost and EGT.
6. Intercooler - almost looks like I could mount a short/wide intercooler right on top of the motor between the compresser outlet and the downpipe to the throttle body - anyone ever done this or know where I could get a stuby intercooler with offset ports?
7. Intake Air filter - should I try to reuse the stock air box and filter assembly or is this too restrictive for the turbo? I dont want to run just a cone filter for fear of flooding the engine while 4x4ing.. And suggestions? Should I snorkle it, or just fab something up so I can use the stock cruiser intake system which seems to do a pretty good job of keeping water out..
Here's a pic of where I left it at last night:
Thanks for any help and advice.
Jon
Finally got around to starting on turboing the 3b in my 1985 CDM BJ70 (340000km) and am looking for some advice from the mud guru's:
Here's the plan:
Have a AXT manifold for a 70 series - 3BII which I had machined to work with my 3B (random craigslist find)
Have a water cooled Turbo from a Vovlo, came with the truck when I bought it. 0.42 / 0.48 AR numbers. Air Research - seems to be a good match to a 3B from my research.
Will be rebuilding the turbo.
Oil supply for the turbo from the oil pressure switch location.
Oil drain back into the lower banjo bolt on the oil filter housing - is this OK, i've seen a number done this way and a number done straight into the pan - would prefer not to have to drop the pan and weld a bung into it - whats the MUD consensus on this one? I can drill the banjo bolt out for more flow and tig a nice large diameter fitting onto it.
Water in/out pretty straight forward - will show some pictures later this week when i get that in.
So my main questions for you guys are?
1. While I have everything torn apart what sort of preventative maintenance should I be doing on this 3B. Should I replace the head gasket considering I'm almost there? Anything else I should be looking at. No idea on compression numbers. Should I replace the engine mounts at 340km?
2. Specific 70 concerns - I know I need to move the power steering reservoir, and am considering replacing the stock sedimenter with an aftermarket fuel/water filter separator and moving away from the turbo's heat. Might also move the vacuum reciever while I'm there.. Anything else for a 70 I should be worried about?
3. Turbo - any chance that I can run this unit without a wastegate because it is so small? I could sure use the room to make the downpipe just with a flat plate and then a close elbow - instead of using the stock exhaust / wastegate collector device that came with the turbo. How about using a flat plate that has the separate wastegate port and just prepare a pipe section so I could run an external waste gate if I need to? Or should I just make it work with the stock exhaust housing.
4. Exhaust - plan is to run 3" OD stainless straight pipe with no muffler. Will this be too loud or OK? And on the 70 any concerns about running it alongside of the transfer case instead of outside of the frame rails? The outlet diameter of the turbo is about 2" ID at the point it leaves the turbine housing, so I was thinking of going from the exhaust weld plate to a 2.5" close 90, then concentric reducer 2.5-3.00" immediately after the 90 and then run 3" the rest of the way with a expansion chamber between the frame mounted sections of the exhaust and the engine mounted sections.
5. Gauges - any cool photos for gauge installation in a 70. Was planning on going electronic oil pressure, water temperature, mechanical boost and EGT.
6. Intercooler - almost looks like I could mount a short/wide intercooler right on top of the motor between the compresser outlet and the downpipe to the throttle body - anyone ever done this or know where I could get a stuby intercooler with offset ports?
7. Intake Air filter - should I try to reuse the stock air box and filter assembly or is this too restrictive for the turbo? I dont want to run just a cone filter for fear of flooding the engine while 4x4ing.. And suggestions? Should I snorkle it, or just fab something up so I can use the stock cruiser intake system which seems to do a pretty good job of keeping water out..
Here's a pic of where I left it at last night:
Thanks for any help and advice.
Jon