The transmission I'll be getting this week is a JSPEC japanese import. I'm not all that familiar with JSPEC, so I'm drumming up some opinions about this product. What I have heard about has been good, but again it not alot of info.
Hopefully some of you heavy hitters(AZhitman, Q45tech, Fred, Rob, Miniman, HeavyDuty, 1qckser) can give some insight on the JSPEC. I believe this transmission has 30,000 miles on it. It,come with the torque converter.
red
Opinions on JSPEC transmissions for first Gens
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Jeff Williams
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I ahve no experience, but would like to hear about yours, when you get it in.
Z1 Motorsports knows a guy, that modifies the 300ZX Auto Transmissions, to make them stronger. Something about drilling out a valve, or something. They are West of Atlanta, on Interstate 20. BIG 300ZX modifiers. One of the guys REALLY wants to twin turbo my Q. I don't think so, but it would be cool.
Z1 Motorsports knows a guy, that modifies the 300ZX Auto Transmissions, to make them stronger. Something about drilling out a valve, or something. They are West of Atlanta, on Interstate 20. BIG 300ZX modifiers. One of the guys REALLY wants to twin turbo my Q. I don't think so, but it would be cool.
Haha, thanks Red! Never thought I'd make such a list :pface .
As far as my opinion goes... I say awesome find! The biggest problem of getting a rebuilt transmission is whose to say it meets or exceeds factory specs. Getting a JDM low milage transmission providing it was maintained well is a great buy. I'd certainly go JDM before having mine rebuilt. Even if you have your doubts about the true milage on a JDM part, it's hard to go wrong. There are very few cars with more than 100k kilometers on them over there, let alone miles. I believe this is because of the toll booths which are placed everywhere... so guaranteed you're still getting a transmission that'll be good for at LEAST 100-150k more miles!
If you're considering doing mods to the transmission, nows the perfect time; while it's out!
Congrats again on the purchase!
Corey
As far as my opinion goes... I say awesome find! The biggest problem of getting a rebuilt transmission is whose to say it meets or exceeds factory specs. Getting a JDM low milage transmission providing it was maintained well is a great buy. I'd certainly go JDM before having mine rebuilt. Even if you have your doubts about the true milage on a JDM part, it's hard to go wrong. There are very few cars with more than 100k kilometers on them over there, let alone miles. I believe this is because of the toll booths which are placed everywhere... so guaranteed you're still getting a transmission that'll be good for at LEAST 100-150k more miles!
If you're considering doing mods to the transmission, nows the perfect time; while it's out!
Congrats again on the purchase!
Corey
Glad I could provide a pick me up Miniman.I'm getting the transmission form Glenn and he comes highly recomended. I have searched high and low, up and down and until I lost alot of sleep looking for a decent transmission for a good price. I didn't want to get trash and can say that this IMHO is a very good deal. I love research, but can't find much on this transmission.
Speaking of Mods, since I will have this transmission out I would LOVE to do whatever I can to it to increase HP. What about a JWT ecu. I hear not much difference until after 3,000 rpm and not worth the 500-600 dollars for it. I wouldn't mind if I could find a deal for one. TCU? I just have the itch to figure something out.
Anyway, any more info on the JSPEC?
red
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Q45tech
- Moderator
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- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Well a 92 JDM transmission will probably be oem and thus made no later than 1993 meaning its 12-15 years old and probably has less than 60,000 miles on it.
That is usually better than a wrecked domestic or chain guided 90-93 unless the car had an oem rebuilt unit installed.......then mileage is all that counts.
Wish you luck, unfortunately you won't know till you install it.
Why they only charge $500 and no core charge.
That is usually better than a wrecked domestic or chain guided 90-93 unless the car had an oem rebuilt unit installed.......then mileage is all that counts.
Wish you luck, unfortunately you won't know till you install it.
Why they only charge $500 and no core charge.
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HeavyDuty
- Posts: 1281
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95 Nissan 240SX S14
96 Nissan D21
06 Nissan 350Z Z33
Well thanks redman, but speaking for myself, you left out a strategically placed "S" in your description that included me.
Now the Heavy part is spot on.
I would agree about you having a good chance at getting a decent used transmission from a JDM salvage yard. I would replace all the seals (pan, pump, tailshaft, speedo gear o-ring, etc) while it's on the floor.
And...
If you don't mind spending twice as much as you paid for the transmission, my vote for the single most beneficial improvement you could make at this juncture (since it's out anyway) would be a stall converter from someone like Prescision Industries.
A ECU or TCU can be done at any time.
Oh, don't forget synthetic trans fluid & an external cooler is a must.
Don't expect any performance differences between a good operational JDM trans -vs- a good operational USDM one though.
Now the Heavy part is spot on.
I would agree about you having a good chance at getting a decent used transmission from a JDM salvage yard. I would replace all the seals (pan, pump, tailshaft, speedo gear o-ring, etc) while it's on the floor.
And...
If you don't mind spending twice as much as you paid for the transmission, my vote for the single most beneficial improvement you could make at this juncture (since it's out anyway) would be a stall converter from someone like Prescision Industries.
A ECU or TCU can be done at any time.
Oh, don't forget synthetic trans fluid & an external cooler is a must.
Don't expect any performance differences between a good operational JDM trans -vs- a good operational USDM one though.
HeavyDuty wrote:If you don't mind spending twice as much as you paid for the transmission, my vote for the single most beneficial improvement you could make at this juncture (since it's out anyway) would be a stall converter from someone like Prescision Industries.
Heavy, What are the benefits of a good stall converter?
red
Red, you might like to do some valve body mods while it's out. They'll decrease shift times from 0.5-0.7 seconds to less than 0.1 seconds if you choose. IMO, a great mod which also helps decrease heat build up (vs OEM) with every shift! That and a transmission cooler and you'll have a great setup for driving in the city and/or aggresive driving 
.
Corey
.Corey
What kind of valve body mods. I would love to do this!! I don't like transmission work, installing, taking out, but I'm for doing mods that would decrease shift times like that. I'll be waiting for a drive shaft so why not? I need some info or some kind of instructions so I can research this as I'm very interested. Yeah, Yeah, I like aggresive driving!!
red
red
Does any body know how to get a hold of Rob at NRH transmission in Jessup Maryland? Apparently he can do so cool Valve body mods and I'd like to get some info from him.
How does a A blow-off or recirculation valve work when integrated into the manifold?
Would Freddy B at Q45 Performance & Racinghttp://q45racing.bizland.com be a good sorce of info?
red
How does a A blow-off or recirculation valve work when integrated into the manifold?
Would Freddy B at Q45 Performance & Racinghttp://q45racing.bizland.com be a good sorce of info?
red
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HeavyDuty
- Posts: 1281
- Joined: Tue Sep 23, 2003 4:51 pm
- Car: 1995 Infiniti Q45
95 Nissan 240SX S14
96 Nissan D21
06 Nissan 350Z Z33
For a detailed explanation of torque converters, go to
http://auto.howstuffworks.com/torque-converter.htm
A stock converter is for maximum efficiency, a reasonably higher stall converter sacrifices mileage for performance. It's a torque multiplier. I would expect a .3 - .5 1/4 mi improvement in your timeslip with no other changes.
A recirc or blowoff valve is for a supercharged or turbocharged app only.
http://auto.howstuffworks.com/torque-converter.htm
A stock converter is for maximum efficiency, a reasonably higher stall converter sacrifices mileage for performance. It's a torque multiplier. I would expect a .3 - .5 1/4 mi improvement in your timeslip with no other changes.
A recirc or blowoff valve is for a supercharged or turbocharged app only.
I find out some info on the Valve Body Mods. John at Import Performance Transmissions (http://www.importperformancetrans.com) has told me what the mod actually is and that it does produce a harder shift, but the way he does it does not produce the violent shift that other shops will cause. This is his reply to me:
In short, the valve body modification is designed to increase the performance and durability of your transmission. This is accomplished by replacing the inadequate factory calibration with our proven package of shift quality enhancements to make the transmission better able to handle the stress of heavy duty usage. The result is shifts that are quicker and firmer, operating temperatures at the clutch faces that are reduced, the transmission's lube system is improved and the vehicle will generally feel much more responsive to spirited driving. Regards, John
He charges $495.00 and suggest that the solenoid be changed as well. That's another 195.00 or so. He does rebuild transmission's as well and when doing the Valve mods he only needs the valve case which is only 10LBS or so, which saves on shipping.
He may be willing to work a deal for Nico if anyone else is interested. This Valve Mod can be done in lue of getting a level 10 transmission.
It doesn't seem as if anyone else is very interested, but I tought I would check. I'll be the guinie pig here and let you all know how it turns out because I am getting this done.
red
In short, the valve body modification is designed to increase the performance and durability of your transmission. This is accomplished by replacing the inadequate factory calibration with our proven package of shift quality enhancements to make the transmission better able to handle the stress of heavy duty usage. The result is shifts that are quicker and firmer, operating temperatures at the clutch faces that are reduced, the transmission's lube system is improved and the vehicle will generally feel much more responsive to spirited driving. Regards, John
He charges $495.00 and suggest that the solenoid be changed as well. That's another 195.00 or so. He does rebuild transmission's as well and when doing the Valve mods he only needs the valve case which is only 10LBS or so, which saves on shipping.
He may be willing to work a deal for Nico if anyone else is interested. This Valve Mod can be done in lue of getting a level 10 transmission.
It doesn't seem as if anyone else is very interested, but I tought I would check. I'll be the guinie pig here and let you all know how it turns out because I am getting this done.
red