RoninJiro's Build (now diesel)

dhyde79

Titan Swapped / SAS'd
Founding Member
Location
Amarillo, TX
Glad you caught that. Working with diesels as long as I have as well as gasoline, this is were most people fall on their face when converting over to diesel. If I wasn't confident in my theory I wouldn't have tackled the project. Transmissions on diesel drivetrain are geared differently...period. Diesels will always turn lower revolutions no matter what you do, but "turning them up" will increase how fast you get there and believe it or not increase your top end rpm's.

Trust me, it is done by myself and many others in the military and contract support while in the war zones I have been. You will have your newer diesels were increasing fuel will not increase your top end, this is where you are electronically governed and you must change the parameters on the ecu (have done that multiple times on CAT, Cummins, and Mercedes). Even when increasing fuel an removing the electronic governor you will hit a brick wall and never achieve without proper gearing the speed a gasoline engine will achieve.

With the TD27 the top horsepower is reached at about 4,000rpm (leading me to believe the stroke is not as high as normal diesels), even so the TD27 in the van that I drove overseas leveled out rpms at 5k rpm. With that in mind even with the stock transmission it would still turn enough for normal highway speeds here. My 03 xterra never saw more than 5k rpm in any condition and about 3k rpm for highway speed(by choice), but that is just me I suppose. But in the end when it is rolling under its own power I will update on rpms versus road speed and top speed.

glad to hear you've thought through all of the bases sir! I'm looking forward to hearing what your end result is, hopefully everything works great!
 

Roninjiro

Need Bigger Tires
Location
Austin,TX
glad to hear you've thought through all of the bases sir! I'm looking forward to hearing what your end result is, hopefully everything works great!

Thanks dhyde! I can't gut spending a pretty penny and not be 99% sure I can do it and it would do what I needed. If my wife were on the forum she would tell you I have spent literally years plotting and planning the conversion. I am just hoping that me doing this will help others fulfill a dream they have without having much doubt in it.
 

Roninjiro

Need Bigger Tires
Location
Austin,TX
Ok, guys got an update on the shipping of my TIG welder, it will be at my door sometime the middle of next week. So next weekend I will be fabricating the new motor mounts and digging into the wiring harness. It looks like I should be driving it by early to mid March. I will be selling my Subaru STi to help fund this project too.
 

J Everett

Suspension Lift
Founding Member
Location
Houma, LA
I admire your dedication to your diesel Xterra build. I wouldn't sell an STi for anything short of funding a kidney replacement. :)
 

Roninjiro

Need Bigger Tires
Location
Austin,TX
lol, thats what I thought too, but my wife and I share no really memories with the STi.... the xterra is nothing but memories and good times. Also I just bought the STi only to have spun a bearing 2 weeks after normal driving.... so in actuality I am pulling engines in 2 vehicles at the moment and the subaru is costing me over $1k in parts (for a stock rebuild) with me doing the work... so it has got to go! lol
 

dhyde79

Titan Swapped / SAS'd
Founding Member
Location
Amarillo, TX
lol, thats what I thought too, but my wife and I share no really memories with the STi.... the xterra is nothing but memories and good times. Also I just bought the STi only to have spun a bearing 2 weeks after normal driving.... so in actuality I am pulling engines in 2 vehicles at the moment and the subaru is costing me over $1k in parts (for a stock rebuild) with me doing the work... so it has got to go! lol

I hate when that happens...buy a car with an awesome reputation for being a BAMF only to get a bad one....happened to the father in law with his last corvette....C5 that was utterly gutless...I felt bad for him (but not bad enough to crawl under the hood and work on a chevy for him).
 

Roninjiro

Need Bigger Tires
Location
Austin,TX
Church thank you for the welcome, I am glad to be here!

dhyde, yea it is a huge downer and setback for me. The car looks perfect inside and out and only looks 2 years old at that..... I would love to keep it, but after seeing what it will cost me just to rebuild it myself, i am pretty pissed about it. I think it is more of a sign though to let go of my old fast addictions. I have never had a traffic ticket, and don't ever plan it. This car will most likely be the one that gets me in trouble. I don't know, everything about the car spells trouble for me so I have to let it go.
 

Roninjiro

Need Bigger Tires
Location
Austin,TX
Food for thought:

I was WRONG about gearing!!!

original vehicle had a rated top speed of 93mph and weighed in at around 3900lbs.

auto gearing in the diesel and gas transmissions are the same, as well as stall revolutions (torque converter and valve body is different though).

the only things that makes the the two different are: torque converter, bell housing, factory hd skid plate, stock wire harness, and the neutral switch.

I forgot to even look in the factory service manuals i have lol (to know the exact ratios, shift schedules, torque lock up, and vehicle speeds at shifts)

EDIT:
All you manual guys... the transmission is the exact same (same part number, gear ratios...etc) as you have on your 3.3's. the only mandatory difference would have to be the belhousing
 
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Roninjiro

Need Bigger Tires
Location
Austin,TX
It has arrived!!! now I gotta go get my argon tank, filler metal, more tungsten and wire it up!!! WOOT

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Kris&HerX

Bumpers Installed
Founding Member
Location
Boise, ID
I bow down to you man! So excited to see where this truck is going and to know that it has such a caring and careful creator as you! As everyone else has said - can't wait to see the finished product!!!
 

Roninjiro

Need Bigger Tires
Location
Austin,TX
Guys I have lots of ideas racing through my head... just picking and choosing is the problem. Once I get the drivetrain how I want it, I will be looking into ideas of micro camping with the xterra. It will not be for the faint of heart though.... lots of fabrication will be involved. Or as my wife says "getting it ready for travel". The only problem is... designing something that will work for 2 kids, 2 adults, and 1 small dog. After experiencing the minimals for the past few years, I think it is possible on such a small platform. When I picture in my head i automatically think transformer, but that is still in the planning stage. Anyhow, on the to do list as of now:

1. custom snorkel unlike any seen yet on xterras
2. rear winch
3. micro camper conversion
4. spare tire mount (have an idea, but will wait till I try it)
5. mud flaps (functional ones)
6. replace driver fender
7. aux lighting
8. dual batteries w/ switchable isolator
9. dc/ac converter
10. surveying pan/tilt low light cam on pneumatic mast (for surf fishing)
11. HAM system
12. many other things
 

Roninjiro

Need Bigger Tires
Location
Austin,TX
little update, I have been in the moving process and have not had a chance to touch the truck. I have however reviewed all wiring schematics and know what I will be modifying. I still have not had time to make the new motor mounts, but have ordered and received the steel stock I needed. When time permits guys... when time permits...

also my other bogging task lately is rebuilding this sti engine and ordering parts and it is dam*ed expensive! this rebuild also takes priority over the xterra build, as this will fund the xterra project.
 

Roninjiro

Need Bigger Tires
Location
Austin,TX
Apparently, my business is still registered as active and not dissolved. This is what the comptroller told me yesterday, and I have been thinking. If I started doing conversion full time, how much interest would I get? I was thinking turn around time would be around 3-4 weeks as long as I have all parts needed in stock and not backordered. If I have to order the engine/trans it would add around 30-60 days to that. Just a thought right now since I can't get to my truck right now to finish it. Oh how I would love to make messing with xterra's full time with no distractions!
 

J Everett

Suspension Lift
Founding Member
Location
Houma, LA
Man, I'm sure a lot of guys would love for you to swap diesels into their Xterra/Frontiers. I just don't know if you could make it affordable enough to get the volume you would need to make a full-time living doing it. I really, really wish you the best of luck with that idea, because I want to see it happen!


BTW, how much are you going to sell the STi for, and what year is it? I may be interested, and I know a few guys who would definitely be interested if I couldn't buy it.
 
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Roninjiro

Need Bigger Tires
Location
Austin,TX
Everett, I hope it works out too but I have a feeling if I do it, I will only be able to swing it part time and do it silently in my apartment garage to offset costs. So for all you higher than 3" lift guys.... crank em down or take off your roof racks!!! lol.

The STi engine is almost completely back together and I should have it back in this week. I will be selling it for kbb, or edmunds pricing. It is definitely worth the value stated and I rather keep my temptation on earning speeding tickets to zero. But keep in mind anyone who does buy it needs to follow proper breaking procedures and not dog it until after 1k miles. year is 2006 in WRB, stock everything except the 2010 nitrate crank and 2011 connecting rods, and rally mud flaps. should be under 70k miles last I checked. body is in excellent condition with no dings or scratches I could find, interior is in excellent condition as well and a non smoker car.
 

J Everett

Suspension Lift
Founding Member
Location
Houma, LA
Whew. That's about $21k. Can't quite bring myself to spend that, not right now. I'll tell a couple of guys I know, but I'm sure you'll have no problem selling it, especially near Ft. Hood. GL with your sale, so we can see more of this diesel swap!
 

Roninjiro

Need Bigger Tires
Location
Austin,TX
lol thanks j, I am still pissed about it but sometimes you have to just remember it is a "material" thing that you can live without. I am just glad they hold their value the way they do
 

dhyde79

Titan Swapped / SAS'd
Founding Member
Location
Amarillo, TX
for a first attempt, I'd say not that bad, I'd bet he could go through and do another one once he's done with his for far less...
 

ChiXterra

Wheeling
I am going to SAS it myself, but I'll put together an SAS, and I'll not buy the kit. And a diesel swap would be done with some help from a couple friends. But, 6K is a hard number to swallow. At that point, I have to ask myself whether the cost is worth it in the long run. I am looking to see what kind of savings I can get fuel wise. I think it would honestly be more cost effective when the mileage on the 3.3 gets way up there.
 

Roninjiro

Need Bigger Tires
Location
Austin,TX
lol it is less than your professional SAS installs with parts included. The price I pay to stay all Nissan! Next Nissan I get will be a CC frontier short bed 4x4 and that will also get the swap! Lol I may be getting carried away with this.

I can't commit to doing a SAS yet, never needed anything more than what I have.
 

dhyde79

Titan Swapped / SAS'd
Founding Member
Location
Amarillo, TX
I am going to SAS it myself, but I'll put together an SAS, and I'll not buy the kit. And a diesel swap would be done with some help from a couple friends. But, 6K is a hard number to swallow. At that point, I have to ask myself whether the cost is worth it in the long run. I am looking to see what kind of savings I can get fuel wise. I think it would honestly be more cost effective when the mileage on the 3.3 gets way up there.

I dunno dude, the thing is, if you can't do the wrench work yourself to rebuild the diesel, I don't suggest you get one...the maintenance costs *ARE* higher on diesel, which, given the higher price of the fuel as well, I don't see how you'll be making up the cost of doing the swap anytime soon, nor justifying it from the fuel economy standpoint. sure the diesel may have more torque than your 3.3 but, that's all it's got on it really.... as far as a SAS...if you spend less than 6K on a SAS, you've either got a fantastic hook up on parts, or you didn't upgrade to BETTER parts while you did the SAS, you're just getting it in there and will be doing the upgrade later....(there's a LONG thread on this on the nissan 4x4 group on FB, most everyone estimates a SAS job should run you 6-7k unless you junkyard parts absolutely everything, fabricate all mounts/brackets/etc yourself, and even then you're pushing your luck because of adapters that you need.)


Roninjiro: do you have an estimate on what you expect the fuel economy to be on the diesel swap? HP/Torque numbers? I'm curious, I'd like to do a pros/cons on the gas vs diesel...
 

Roninjiro

Need Bigger Tires
Location
Austin,TX
I dunno dude, the thing is, if you can't do the wrench work yourself to rebuild the diesel, I don't suggest you get one...the maintenance costs *ARE* higher on diesel, which, given the higher price of the fuel as well, I don't see how you'll be making up the cost of doing the swap anytime soon, nor justifying it from the fuel economy standpoint. sure the diesel may have more torque than your 3.3 but, that's all it's got on it really.... as far as a SAS...if you spend less than 6K on a SAS, you've either got a fantastic hook up on parts, or you didn't upgrade to BETTER parts while you did the SAS, you're just getting it in there and will be doing the upgrade later....(there's a LONG thread on this on the nissan 4x4 group on FB, most everyone estimates a SAS job should run you 6-7k unless you junkyard parts absolutely everything, fabricate all mounts/brackets/etc yourself, and even then you're pushing your luck because of adapters that you need.)


Roninjiro: do you have an estimate on what you expect the fuel economy to be on the diesel swap? HP/Torque numbers? I'm curious, I'd like to do a pros/cons on the gas vs diesel...

Pros and cons:

~~~~TD27T Diesel~~~~
Pros:
-Installed with no HP/TQ mods... looking at around 30mpg (based on others with Terranos, most slightly modded)
-Easier to troubleshoot then the 3.3 and smaller in size (mechanical injection)
-retains stock nissan sensors and stock transmission (with bell housing change)
-Mounting only requires custom engine mounts but still uses stock drivetrain
-considered a bulletproof platform by owners in oz land.
-Fits like it was supposed to be there with no drivetrain mods (SAS, driveshafts)
-can increase power output safely with proper mods
-all stock gauges retained without modification using stock signal inputs

Cons:
-initial cost
-At stock configuration, low HP/TQ numbers (non after cooled rated at 100hp 160lbft)
-In frame rebuild will cost you around 2k (gaskets, rod/main bearings, pistons, liners)
-Swap is not for the faint of heart or anyone not familiar with motor swaps, fabrication or diesels.
-Finding an exporter/importer to locate and ship the power pack for you
-Parts distributors can be hard to find!
-OEM oil filter costs $25 from nissan :O
-You NEED to know how to maintain and rebuild diesels if needed, as your regular show will be like WTF is this??!!

~~~~~~VG33e ~~~~~~~~
Pros:
-Non modified stock power
-Generally bulletproof
-Parts availability
-Some aftermarket support

Cons: (these are the cons I experienced)
-tight fit, can be hard to access repair or maintenance areas
-Fuel mileage!! (my biggest pet peeve)
-overheating issues (radiators fault)
-cracked headers
-PITA to remove

ALL of the pros and cons are my opinion... especially the VG33e portion. Stacked side by side, most will not and should not perform the conversion (especially you emission guys). I am the guinea pig here, so just sit back and watch if you are still interested in doing something like this and would like to know the hassles and troubles involved. As dhyde79 stated there are other things you can do with 6k, I chose a different route to suite my needs.

You can always try to do a 4BT swap or something similar if you wanted but as far as costs goes your guess is as good as mine. Like with any swap you have to consider the history of nissan swap history and consider your odds as well. The frontier swap with the titan engine for instance was a partial success with transmission shifting issues. There are other TD27T swaps in the USA but they are usually done in the older nissan pick ups and I have not found otherwise. As time goes and progress continues I will add to the Pro/Con list on the diesel side.

fuel savings:

gas at $4/gal 15k miles a year at 14mpg (my average) $4,286

diesel at $4.20/gal 15k miles a year at estimated 30mpg $2,100

3 years for me to make back what I put into the swap (parts and tool cost), this doesn't account for if I go wvo.

Or 4 years if I do an in frame overhaul in that time period
 
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