J35Y1 compared to the J35Z(2)(3)(6) - Drive Accord Honda Forums | radio-pro.ru
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post #1 of 33 Old 04-29-2014, 10:08 PM Thread Starter
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J35Y1 compared to the J35Z(2)(3)(6)

What exactly is the difference between the J35Y1 compared to the J35Z's? I am trying to find a J-Pipe replacement, and I know that on the 4-cylinders, F-Series and H-Series engines had many interchangable parts. I am wondering if these J-Series share the same traits? I want a J-Pipe and can't understand why the 2012 J-Pipe won't fit on the Earth Dreams engine...
I have many plans for my V6 Touring, and to start it will first be the J-Pipe, then cat-back piping unrestricted to a Borla axle-back exhaust (I like the way the Borla sounds better than any other). I would love to find a DOHC head that would mount onto my cylinder block with VTEC on exhaust and intake sides both, later on of course. That would follow of course a full ported out intake and exhaust inlet/outlet. I may be talking nonsense, but I have high hopes!

If any of you, have any pictures of the two engines and their exhaust manifolds and down-piping, I'd like to see what the difference is. Maybe if any of you know exactly why they're so different that the XLR8 J-Pipe won't fit, I would love to know. It has been a very long time since I have worked much in the tuning area, and I love my V6!

Thanks for any insight-pardon the Honda pun, I couldn't resist!


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post #2 of 33 Old 04-30-2014, 07:28 AM
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Quote:
Originally Posted by accordex-lv6 View Post
What exactly is the difference between the J35Y1 compared to the J35Z's? I am trying to find a J-Pipe replacement, and I know that on the 4-cylinders, F-Series and H-Series engines had many interchangable parts. I am wondering if these J-Series share the same traits? I want a J-Pipe and can't understand why the 2012 J-Pipe won't fit on the Earth Dreams engine...
I have many plans for my V6 Touring, and to start it will first be the J-Pipe, then cat-back piping unrestricted to a Borla axle-back exhaust (I like the way the Borla sounds better than any other). I would love to find a DOHC head that would mount onto my cylinder block with VTEC on exhaust and intake sides both, later on of course. That would follow of course a full ported out intake and exhaust inlet/outlet. I may be talking nonsense, but I have high hopes!

If any of you, have any pictures of the two engines and their exhaust manifolds and down-piping, I'd like to see what the difference is. Maybe if any of you know exactly why they're so different that the XLR8 J-Pipe won't fit, I would love to know. It has been a very long time since I have worked much in the tuning area, and I love my V6!

Thanks for any insight-pardon the Honda pun, I couldn't resist!


Sent from
this is an 8th generation J pipe. I know it fits other than moving an oxygen sensor(easy).


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post #3 of 33 Old 04-30-2014, 08:55 AM
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Originally Posted by sleeperv6accord View Post
this is an 8th generation J pipe. I know it fits other than moving an oxygen sensor(easy).
How do you know it fits?

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post #4 of 33 Old 04-30-2014, 09:08 AM Thread Starter
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Originally Posted by sleeperv6accord View Post
this is an 8th generation J pipe. I know it fits other than moving an oxygen sensor(easy).
I would like to know how you know that it fits as well. Also, I think I would rather wait for the XLR8 J-Pipe because this RV6 J-Pipe doesn't look like it is any less restrictive than the stock J-Pipe. Where everything comes together at the cat (unless this cat is deleted), the restrictive airflow there is so much tighter than the XLR8.

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post #5 of 33 Old 04-30-2014, 09:16 AM
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Originally Posted by accordex-lv6 View Post
I would love to find a DOHC head that would mount onto my cylinder block with VTEC on exhaust and intake
This may be the most comical post I have ever seen.

I'm gonna put a jet turbine on my car!
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post #6 of 33 Old 04-30-2014, 09:20 AM
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While on this topic, looking at the whole exhaust setup I think a lot of the gains will be seen with the PCD's.If you look at the stock head>precat>jpipe area, it looks super restrictive...the outlet of the built in exhaust manifold to the precat looks to be only about 1.5". I'm waiting for the Jpipe and PCD's because I was told the 8th gen will not work for 9th gen.

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post #7 of 33 Old 04-30-2014, 09:21 AM Thread Starter
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This may be the most comical post I have ever seen.

I'm gonna put a jet turbine on my car!
Not sure what is so comical about this, but it SHOULD be possible on a DOHC since it is possible on the J37A4 3.7L SOHC V6, both intake and exhaust valves have VTEC, not just one or the other, like the Earth Dreams with VTEC only on intake side....


According to what I have been researching, it appears that only one series engine the C-Series C35B is the only DOHC V6 with VTEC Honda ever produced. However, it does not indicate whether or not VTEC lobes are used on either, or, or both; on the intake and exhaust side's of the camshafts. So I am still wondering if Honda has made one that would bolt onto my J35, and still am struggling to see the comedy in this...

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post #8 of 33 Old 04-30-2014, 09:29 AM
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The comical part is not the true VTEC. You can't just swap a DOHC head on a J. There isn't a DOHC J. Sure, go build a 100% custom spec head. Bisimoto, creators of the 1029hp Odyssey, used SOHC heads.

Even more comedy!! C35B!!! An engine from a concept car!! Not even the C32B!

Dream all you want about crackin' VTEC in your family sedan with an automatic transmission...

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post #9 of 33 Old 04-30-2014, 09:35 AM Thread Starter
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The comical part is not the true VTEC. You can't just swap a DOHC head on a J. There isn't a DOHC J. Sure, go build a 100% custom spec head. Bisimoto, creators of the 1029hp Odyssey, used SOHC heads.
"I would love to find a DOHC head that would mount onto my cylinder block..."

This in no-way indicates that I think it exists and is possible, I already KNOW this. The point I was making was that "I would love it", if it were possible. I know there are heads that mount onto the J-series, but have yet to see Honda make a DOHC V6 period! The C-Series used over 20 years ago produced high numbers, and that is what I am looking for! I don't care to have a full built engine, just something that would be a nice modding machine. A DOHC has some very promising gain potential. So, again, where is this so comical?

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post #10 of 33 Old 04-30-2014, 09:49 AM
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How do you know it fits?
This guy has done it
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post #11 of 33 Old 04-30-2014, 09:51 AM
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I don't care to have a full built engine, just something that would be a nice modding machine.
People have been modding the J series for over 10 years. Many, many people have squeezed lots of performance out of these engines with countless hours of tuning and thousands of dollars of mods. Wouldn't it be right in assuming that everything has sort of "been done" already? Turbos, superchargers, forged internals, etc... You're probably not the first to think of a DOHC J. I've seen full on RACE built J's with SOHC setups. It's an inherent quality of the engine. I wouldn't have bashed you, had you said "I would like to swap a J37A4 true VTEC head," as that is a reasonable thought. No one has DOHC swapped a J and there is no reason to. If you wanted a DOHC racecar, you would have bought one; not a family sedan with an automatic transmission.

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post #12 of 33 Old 04-30-2014, 10:04 AM
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I go back to the fact that Honda is an engine builder first and a car manufacturer second. If a DOHC J series would have been a huge improvement they would have done it. I'm not trying to be in the argument, just pointing that out. There are some great bolt on J series mods that won't break the bank tooooo much and net some pretty good improvements, so let the enthusiasm continue!

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post #13 of 33 Old 04-30-2014, 10:07 AM
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I don't disagree with you wanting to extract performance from your car, but wanted to share my thoughts on the DOHC swap idea.

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post #14 of 33 Old 04-30-2014, 10:31 AM Thread Starter
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I don't disagree with you wanting to extract performance from your car, but wanted to share my thoughts on the DOHC swap idea.
I fully understand what you're saying, I have seen where DOHC has been a much better performer in the low end all the way through the power band to high MPH numbers, where the SOHC started to fall short and very disappointingly slowed down. My biggest desire is to feel a DOHC V6 with VTEC, because my H22 Prelude I had several years ago pushed me back in my seat when VTEC engaged, and I never felt that in any SOHC VTEC, it's much more subtle. The sad truth is, I could feel VTEC ten times stronger in my H22 than I ever felt in my 7.5 gen V6 (which I very hardly feel at all) and barely feel it in my 9th gen. I am not sure if the 390cc injectors I had in my Prelude were a culprit to the strong VTEC, but it was powerful.
I wanted the V6 EX-L 6-Speed manual, but we ended up getting the Touring Sedan instead, for more practical reasons. If I can get all the mods I want from the J35Y I will swap to the Coupe 6-6 because now I can, whereas before I couldn't. Also, now I know that I can just order the LED headlights for the coupe in Canada and have them shipped here, buy the harness that HTG makes, and put them on the coupe.

You hit the nail on the head when you said "extract performance from your car". That's all I want to do... A nice exhaust note, a few bolt ons, nothing too fancy and I'm satisfied. If I could bolt on a ported DOHC head, true VTEC, and a nice J-Pipe, Borla Axle back exhaust, a few more swap outs for higher performance, I'd be satisfied.

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post #15 of 33 Old 04-30-2014, 12:31 PM
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There are a few guys over on S2ki who have C32B DOHC heads on high compression J35 blocks (swapped in SK2!) making around 350HP N/A. It can be done, but it will be pricy. You will most likely lose some low end & midrange torque but this thing could scream to 8000RPMS+ on a well balanced motor. In a accord body, it doesn't make much sense to me though, you still have a FWD lard to move.


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