j 30 engine = 300 zx engine?
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infinitij30driver
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j 30 engine = 300 zx engine?
i've read a lot of differnt places that the j30 and nissan 300zx have the same engine. is this true, and if so, can you use 300zx parts on the j30?
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infinitij30driver
- Posts: 13
- Joined: Tue Jul 08, 2003 9:17 pm
- Contact:
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infinitij30driver
- Posts: 13
- Joined: Tue Jul 08, 2003 9:17 pm
- Contact:
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infinitij30driver
- Posts: 13
- Joined: Tue Jul 08, 2003 9:17 pm
- Contact:
Where did you find a spoiler painted for $215? Is it a store/online, or a local sale? I have been wanting to add a spoiler to it. No offense to the J30, but it kinda looks odd w/o a spoiler (kind of like the Acura CL 3.0/2.2). Also, did anyone else get BBS rims from the factory/dealer on their J30? I just bought mine about a month ago from a 60 year old lady, and she said it came with them. I have not found a pic of one anywhere with stock BBS 15" rims. inside honeycomb is colored matched to the car. I will post a pic.
-Rob 93 J30
-Rob 93 J30
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infinitij30driver
- Posts: 13
- Joined: Tue Jul 08, 2003 9:17 pm
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sorry, my price was off $9, its $224 factory painted. $133 unpainted (might be a good idea if you know somone to piant it for cheap. http://www.spoilerdepot.com
http://www.spoilerdepot.com/Ca...&idB=
http://www.spoilerdepot.com/Ca...&idB=
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infinitij30driver
- Posts: 13
- Joined: Tue Jul 08, 2003 9:17 pm
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infinitij30driver wrote:would it be easy to add a intercooler , and i f so would be worth it? also, i have to get my oil changed in about 400 miles, what kinda oil is good for the j?
search: oil discussions are aplenty around here. I use mobil full-syn religiously, although there are better options.
intercoolers only benefit an engine with forced induction. unless you have a very special J30 indeed, the intercooler will only hamper your performance due to extra tubing convolutions and inherent pressure drop across it.
Are the computers swapable between the J and 300? When you say different tuning, do you mean computers, or heads/etc... ?
Also, another question. I was reading under the hood that the J30 runs at 15 degrees timing. I take it that this is with 93 octane. Does it drop back to the normal 10 degrees on 89 octane, or is there a knock sensor that will keep it at 15 unless knocking is heard, and then it will retard?
-Rob 93 J30
Also, another question. I was reading under the hood that the J30 runs at 15 degrees timing. I take it that this is with 93 octane. Does it drop back to the normal 10 degrees on 89 octane, or is there a knock sensor that will keep it at 15 unless knocking is heard, and then it will retard?
-Rob 93 J30
there are some exceptions and tricks, but they can be swapable. (need an auto one)
suprisingly, the TT and NA Z32 ecus are virtually identical (fuel and timing wise)
well, thats base timing. the ECu holds maps for different load conditions/RPM as well as for different (1 high and 1 low) octane ratings, as determined by the knock sensor.
dont know why you are asking, but dont stray from premium.
suprisingly, the TT and NA Z32 ecus are virtually identical (fuel and timing wise)
well, thats base timing. the ECu holds maps for different load conditions/RPM as well as for different (1 high and 1 low) octane ratings, as determined by the knock sensor.
dont know why you are asking, but dont stray from premium.
So you couldn't just pop an aftermarket chip for a 300zx NA in there correct? I knew that Wolf and Stillen made chips for the 300 that remaped and gave more power (400HP for the TT). I was just wondering if it were possible. I honestly cannot afford any worse gas mileage than I have now 
so I better shut my mouth. I just got the J30 and I came from a Miata (29 mpg), so this 15-17 mpg is hurting the wallet seeing as I put 3000 miles a month on the car. Not really wanting to do it, just more curiosity.
-Rob
so I better shut my mouth. I just got the J30 and I came from a Miata (29 mpg), so this 15-17 mpg is hurting the wallet seeing as I put 3000 miles a month on the car. Not really wanting to do it, just more curiosity.-Rob
There is an after market remap for the J30 ECU. It increases the rev limit and removes the top gear rev limiter. I have read on these forums that this would allow for 10% more horse power at WOT. The timing is also advanced. That said, what you lose is the EOM safety/longevity factor.
You should be getting 20-24 mpg (depending on your driving stlye and local fuel formulation) for all around driving. Your numbers look quite low.
There is a wealth of information available on this site that you can access by performing a simple search. Check it out.
You should be getting 20-24 mpg (depending on your driving stlye and local fuel formulation) for all around driving. Your numbers look quite low.
There is a wealth of information available on this site that you can access by performing a simple search. Check it out.
ive always gotten 17-21mpg, and i have yet to find anything wrong.
I have researched it substantially, and any pre-96 300zx NA ecu should work in the j30. JWT puts new/reprogrammed 256K EPROMS in the 300zx ECU.
ACTUALLY, come to think of it, i bet JWT uses/could use 300ZX cores when it ships back J30 ECUs.
listen to this:
fact: all J30s (were talking pre-96) use a 16 bit ECU system.fact: all pre 94 300zx (about 70 percent total build) use an 8 bit systemfact: 16 bit system cannot be socketed, cannot simply replace the EPROM to change maps, as with the 8 bitters.fact: 8 and 16 bit ECUs are completely interchangeable back and forthfact: only recently have tuners in japan unlocked nissan secrets to modify OBD2 and 16 bit style ECUs for the 300zxfact(some will argue): JWT is never ahead of the JDM tunersfact: both 8 and 16 bit 300zx ECUs (for auto NA's) plug right into J30s and work, and the reverse is true as well.
my assertion: JWT uses 8 bit 300zx cores for upgraded J30 ecus.
actually, come to think of it, they might use a daughterboard instead. Ive never actually seen a JWT J30 ECU.
but the fact is, that they COULD, it would work, and it would be significantly cheaper, at least for them.
they will always charge 600 for their max 10 dollars in parts, including the socket, solder, and electricity used to run the EPROM programmer.
oooh right, intellectual property :Bull S....!
90 percent of the 256k on the JWT EPROM are stock nissan anyway, which JWT has copied somehow or other, dont tell me they did it from scratch. so, they are stealing from nissan and charging you 540 dollars for info your EPROM already holds.
sweet deal, huh?
I have researched it substantially, and any pre-96 300zx NA ecu should work in the j30. JWT puts new/reprogrammed 256K EPROMS in the 300zx ECU.
ACTUALLY, come to think of it, i bet JWT uses/could use 300ZX cores when it ships back J30 ECUs.
listen to this:
fact: all J30s (were talking pre-96) use a 16 bit ECU system.fact: all pre 94 300zx (about 70 percent total build) use an 8 bit systemfact: 16 bit system cannot be socketed, cannot simply replace the EPROM to change maps, as with the 8 bitters.fact: 8 and 16 bit ECUs are completely interchangeable back and forthfact: only recently have tuners in japan unlocked nissan secrets to modify OBD2 and 16 bit style ECUs for the 300zxfact(some will argue): JWT is never ahead of the JDM tunersfact: both 8 and 16 bit 300zx ECUs (for auto NA's) plug right into J30s and work, and the reverse is true as well.
my assertion: JWT uses 8 bit 300zx cores for upgraded J30 ecus.
actually, come to think of it, they might use a daughterboard instead. Ive never actually seen a JWT J30 ECU.
but the fact is, that they COULD, it would work, and it would be significantly cheaper, at least for them.
they will always charge 600 for their max 10 dollars in parts, including the socket, solder, and electricity used to run the EPROM programmer.
oooh right, intellectual property :Bull S....!
90 percent of the 256k on the JWT EPROM are stock nissan anyway, which JWT has copied somehow or other, dont tell me they did it from scratch. so, they are stealing from nissan and charging you 540 dollars for info your EPROM already holds.
sweet deal, huh?
well, AFCs and S-AFC etc have been used in 300s, i dont know about this VTEC variant...and the consensus for at least the other variants is that it is unnecessary equipment, especially with a good boost controller and EPROM maps already in place.
i will check the apexi japanese site to see if it is even applicable, but the VTC release wont help you much anyway.
a good EPROM emulator will allow you to change ALL your maps, injector size, dwell, VTC release included.
the blue screen IS cool, but thats all ill give it, especially for that price.
i will check the apexi japanese site to see if it is even applicable, but the VTC release wont help you much anyway.
a good EPROM emulator will allow you to change ALL your maps, injector size, dwell, VTC release included.
the blue screen IS cool, but thats all ill give it, especially for that price.
From what I have read, it sounds like Nissan/Infiniti has done a great job at releasing a car that is already at near top level of capable performance. I have always been upset at manufactures that make a mediocur product and you have to invest allot of $$$$ to reach par of an engine. They definately have milked all they could out of it from the factory. I have not read any posts about performance mods and I think that speaks for itself. Even a brake thread I read said that stock was best Go figure. Thanks all for throwing the idea around. I have read some 300's with the S-AFC but I did not read any review on if it was worth a darn or just something pretty to sit on the dash and make lights and noises.
Just for questions. Has anyone removed the catalytic converter from their J30 (for race purposes ofcourse
) I know 3 people with completely different automobiles that did this and recieved an additional 5 miles per gallon on average. One a Miata, the other a V6 Camry, and the other a Civic. Any light on this? p.s. the rear bumper needed weekly cleaning once this was done since there was nothing to clean the air coming out. I think we have all seen the civic with black bumpers driving around town haha. I know in 1994 OBD2 emmision came into play and it would trip off the engine light if the cat was removed since I believe on most cars it put a sensor before and after the cat. So this is a easy thing to do only if you are 93. I'm not trying to destroy the planet, just wondering if it has been done.
-Rob 93 J30
Go figure. Thanks all for throwing the idea around. I have read some 300's with the S-AFC but I did not read any review on if it was worth a darn or just something pretty to sit on the dash and make lights and noises. Just for questions. Has anyone removed the catalytic converter from their J30 (for race purposes ofcourse
) I know 3 people with completely different automobiles that did this and recieved an additional 5 miles per gallon on average. One a Miata, the other a V6 Camry, and the other a Civic. Any light on this? p.s. the rear bumper needed weekly cleaning once this was done since there was nothing to clean the air coming out. I think we have all seen the civic with black bumpers driving around town haha. I know in 1994 OBD2 emmision came into play and it would trip off the engine light if the cat was removed since I believe on most cars it put a sensor before and after the cat. So this is a easy thing to do only if you are 93. I'm not trying to destroy the planet, just wondering if it has been done.-Rob 93 J30