jdm motors

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

what are the differences in the USDM z32 tt cars and their jdm counterparts in terms of wiring harnesses and parts interchangablity?are there any/ [obviously the jdm motors will be lacking egr valves and such, im focusing on parts]

Website · Post by **s13sr20chris** » Sat Oct 18, 2003 10:40 am

jdm cars dont have the stupid little precats bolted up to the turbos. a guy i work with installed a jdm motor for a customer(at the dealership no less) and when he test drove it, he said it felt stronger. subjective? yeah. someones 2 cents(not mine). i would assume you are right about the egr(yay jdm); prob dont have any evap, air injection, etc. i imagine the harness would be different though. right hand drive, different emissions stuff, etc makes for different harnesses. doable though.

edit: egr on z32 cars is a pain; i hate it

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

so far all the differences are upsides. im saying because the j30t i bought is just to put the vg30dett in it with the 5 speed. i dont even drive the damn thing. its sitting in the storage yard of my job, its been sitting for like 2.5 years. fires right up and runs great, but i dont think i want it as a daily driver. the harness is gona be different and whatnot, but thats not a big concern. basically if usdm parts like the water pump, sensors, alternator, ect are the same this project gets the big fat green light from me...

edit- it wasnt mine for that long, bought it from a friend whose mother drove it out of the showroom. cars only been mine for a few months.

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

also, my opinion on it as a daily driver just might change after it starts breathing fire...

Website · Post by **s13sr20chris** » Sat Oct 18, 2003 10:40 am

as long as we are talking z32 motors...... dont ask me how i know that a z32 water pump will not fit a j30.

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

its ok, im taking the j's motor and transmission and towing them to the nearest cliff.

jdm z32 motor, transmission, harness, ecu, brake/clutch MC's | gt25 turbos, 555cc inj, jwt ecu, kaaz 1.5lsd, clutch.

since that should leave me broke, and with a months worth of work, the recaro sport seats have to wait till next winter

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

i meant more along the lines of z32tt us parts being interchangeable with a z32tt jdm motor.

hell, even if there not, what fun is a project without skull splitting migraine headaches??

Website · Post by **s13sr20chris** » Sat Oct 18, 2003 10:40 am

heh heh. thats the spirit.

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

hey, everything's an adventure. if i didnt open the hood and see the na 300zx motor, think to myself "hey, this would be awesome twin turbo" i would have never bought it.

Post by **Eswift** » Sat Oct 18, 2003 10:40 am

s13sr20chris wrote:as long as we are talking z32 motors...... dont ask me how i know that a z32 water pump will not fit a j30.

care to elaborate?

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

hey, eswift. happen to know if the 4 piston calipers from a z32 will bolt up to the j's hub, or will i ned to fab some brackets?brake lines arent an issue, im gonna go SS.

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

Eswift wrote:care to elaborate?

maybe he means that the tt waterpump wont fit the j. in that case its understandable [possibly higer flow]

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

anyway, the turbos fit on the z32 because the motor is mounted farther aft in the z32 correct? or is the steering substantially different?

i dont particularly like superchargers, and i do like a/c, so im gonna do what ever the hell i can to make the turbos fit in there.

Post by **Eswift** » Sat Oct 18, 2003 10:40 am

IvoryJ30t wrote:hey, eswift. happen to know if the 4 piston calipers from a z32 will bolt up to the j's hub, or will i ned to fab some brackets?brake lines arent an issue, im gonna go SS.

pretty sure you need some bracketry

Post by **Eswift** » Sat Oct 18, 2003 10:40 am

IvoryJ30t wrote:anyway, the turbos fit on the z32 because the motor is mounted farther aft in the z32 correct? or is the steering substantially different?

i dont particularly like superchargers, and i do like a/c, so im gonna do what ever the hell i can to make the turbos fit in there.

the problem is two-fold:

1) the J30 has less clearance between the strut towers2) the J30s strut towers are closer to the firewall (relatively "further back")3) the stock exhaust manifolds on the drivers side wraps around the PS rack/column...indicating a lack of space

Post by **Eswift** » Sat Oct 18, 2003 10:40 am

actually thats 3, but whos counting

Post by **Eswift** » Sat Oct 18, 2003 10:40 am

IvoryJ30t wrote:anyway, the turbos fit on the z32 because the motor is mounted farther aft in the z32 correct? or is the steering substantially different?

i dont particularly like superchargers, and i do like a/c, so im gonna do what ever the hell i can to make the turbos fit in there.

i hear ya. turbos are more efficient anyway.

Website · Post by **s13sr20chris** » Sat Oct 18, 2003 10:40 am

Eswift wrote:care to elaborate?

heh, did i suck you in or what? j/kthe z32 water pump is longer. you wont notice unless you stick them side by side. if you use it, not that i would be that dumb:rolleyes it will cause the fan to rub and make a horrible racket.

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

damn, i didnt realize the clearance was that bad. [exhaust manifold]the fan on the water pump is not invited to the party.[nor is the clutch]also, i know its kinda stupid of me to ask for pics/diagrams of that area, but the car is not exactly immediately accesable and i dont have the time to do it [cars an hour away]

Website · Post by **s13sr20chris** » Sat Oct 18, 2003 10:40 am

i can take measurements and stuff from a z32, but i dont have regular access to a j30. the z32 is not on a lift and its not running right now so i cant get all up in it. i will do what i can though. it is a twin turbo by the way.edit: i also have access to service manuals if you want some pics or something

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

ok, well after much hair pulling, im begining to see my vg30dett dreams withering away.

maybe a RB25det, if the rb26 is a tight fit in the z32, i can imagine trying to get it in the j. maybe with a single turbo conversion. [damn, that a crapload of money...]

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

i like the 26 better due to the extra stroke, and the slightly lower compression, but the twins wont fly in there, and id need the 25's transmission anyway.

this damn car is gonna give me a stroke.

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

unstable hybrids has a j30, i think they want to put an rb in it, at least they said something along those lines last time i spoke with them.

i gotta give em a call and talk it over. i really want the vg, but the more research i do, the less feasable it seems.

Website · Post by **s13sr20chris** » Sat Oct 18, 2003 10:40 am

i think the j has a longer engine bay. you may be able to fit an rb motor with less hassle than in a z32. am i right there eswift?

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

also, since the exhaust and turbos sit up higher than the vg, it might clear the steering column and whatnot. but then theres the downpipes.

this is getting out of hand.

Post by **Eswift** » Sat Oct 18, 2003 10:40 am

i think with whatever engine you go with, it will be possible, you will just need custom manifolds.

of course, custom manifolds arent necessarily the easiest thing to fabricate, especially since the custom ones have a history of being prone to cracking on the VG.

as far as which bay is longer,

the J30 engine bay has about 3.5 extra useable inches. (used the body alignment numbers from both service manuals)

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

well, that might just be the qualifier. that and the fact that since the rb's are straight 6's, the manifolds are gonna be up higher, and the motors not gonna be so damn wide. no 60 degree v motor and turbos hanging off both sides. possibly with a single turbo [rb25] or a st manifold [rb26]. since the steering column is so close to the vg's exhaust manifold, it might be possible to squeeze the rb in there with the shaft possibly between the motor and the turbo. possibly shimming the manifold an inch or so might gain the clearance.

also, ive heard the rb25's transmission uses the same output yoke as the n/a 300zx. wouldnt it be funny if the stock driveshaft slipped right into the transmission. i think id laugh for a good half hour.

Post by **Eswift** » Sat Oct 18, 2003 10:40 am

didnt know about the yokes being the same, but I also have to imagine that the transmission housing bolt pattern to the engine is different, that would be my main concern, along with custom engine mounts.

pretty any setup you decide on, you will need some sort of non-trivial custom fabrication.

Post by **IvoryJ30t** » Sat Oct 18, 2003 10:40 am

oh yeah, i would definately use the rb25 transmission, which the rb forums said use a 300zx n/a yoke. but they probably meant 5 speed, so its still probably different. also, im not expecting minor exhaust mani work, but i wanna keep the fabrication of a custom one to a minimum so theres not a cracking issue. my ideal course of action would be to modify the stock manifold if possible, but that might not be possible. gotta do more research before i can settle this issue.

Post by **Eswift** » Sat Oct 18, 2003 10:40 am

welding cast iron..?.most wouldnt risk it.

jdm motors

jdm motors

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