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Old July 31st, 2015, 09:37 PM   #1
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CAM swap stock ECU

05 6-6, j30a4 mostly stock. I got a steal on a good condition j35a8 from an 06 RL shawd. My understanding is that the motor won't go in my car without a bunch of work and that the 7g 6spd trans wont match up. So, was going to start by throwing the RL cams in, I've read hundreds of pages of threads and am getting conflicting info. Will the 7th gen ecu eventually detune after the cam swap? If so, Whats the solution?

Last edited by TxRzrBk; July 31st, 2015 at 09:56 PM..
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Old July 31st, 2015, 11:09 PM   #2
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No, you can't untune valve duration and height.
Since you got a steal on the engine, mind if i steal the intake manifold off you? I need it pretty bad
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Old August 1st, 2015, 11:46 AM   #3
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No, you can't untune valve duration and height.
Since you got a steal on the engine, mind if i steal the intake manifold off you? I need it pretty bad
Makes sense to me but from other threads there were people saying that the ECU eventually adjusts and effectively negates the benefit of the cams. What is the difficulty difference between swapping the cams vs the entire head, assuming the motor remains in the šar?
As far as the intake....That's possible at some point but I was actually considering swapping the intake manifold on to my J30. The one part that was missing was the throttle body so I need to see if it would work with !t tb.
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Old August 1st, 2015, 05:21 PM   #4
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Question

Ok really hoping for some advice here. I pulled the intake manifold and the valve covers off the J35A8, also inspected what I could see of the valves through intake and exhaust ports, this sucker is pristine. I am sickened that I cant reap the benefit of 290 hp and 256 lb.ft of torque. Do I have any other options to get the whole motor in my 7g 6 spd accord?
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Old August 1st, 2015, 05:43 PM   #5
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if you are swapping to OEM camshaft you will be okay. No stage 1 or 2 after market camshaft. I have a j35a8 head on my car, but I have hondata. Still only making 253whp.
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Old August 1st, 2015, 08:19 PM   #6
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What is the benefit of swapping the entire head vs. just the cam? is it feasible to swap the heads without pulling the motor?
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Old August 1st, 2015, 08:46 PM   #7
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my heads are port and polished and decked. Just swap the camshaft and the valve spring over. My car gain over rev protection.

You might want to run an O2 Wide band just to make sure your not running too lean also if you want to do the camshaft without tuning.

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Old August 2nd, 2015, 08:23 PM   #8
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Well I have the whole motor so I have the option to put the injectors from the j35a8 in place also, not sure if that would help with the motor running lean. My elementary understanding of the ecu is that upon reset it will alter the fuel trims to achieve the desired o2 which I thought would offset the additional air flow from the larger cam and intake manifold.
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Old August 3rd, 2015, 05:56 AM   #9
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Nope you can't just put the injectors in. It will run Rich, like I Said u need hondata or a way to make adjustments

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Old August 3rd, 2015, 05:50 PM   #10
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Ken taking care of business.

If I were in your shoes I would pinch pennies for a tl-s transmission to mate with the j35a8 and Hondata. In the meantime rebuild/confirm everything with the engine is ready to go.
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Old August 3rd, 2015, 06:14 PM   #11
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just buy the bell housing and swap it on the tranney. Then the j35a8 will bolt up.
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Old August 3rd, 2015, 06:28 PM   #12
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Paul made that sound more difficult than a simple swap. Anyone have experience doing it?
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Old August 3rd, 2015, 06:30 PM   #13
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someone did on acurazine. It was a j35a8 swap in a tsx
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Old August 4th, 2015, 10:18 AM   #14
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just buy the bell housing and swap it on the tranney. Then the j35a8 will bolt up.
Not sure I understand. Are you saying with the 07+ tl-s 6 speed bell housing I can use my 7th gen 6 speed trans?

Or

Do I need the 07+ tl-s 6 speed transmission and bell housing?
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Old August 4th, 2015, 10:27 AM   #15
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use your accord tranney and swap the bell housing with a 07+ TL 6spd housing, and be done with it.
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Old August 4th, 2015, 09:17 PM   #16
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Many thanks for the replies, I'm going to begin looking for a complete tl-s trans but will settle for the clutch housing, they are definitely going for premium prices so it might take some time to locate one in my range. I'll update with progress as things progress.

Just noticed that the part number for the 07-08 tl-s bell housing aka clutch case is the same part number as the 08+ accord v6 6spd, that might make the Bell housing a little easier to find. The transmission case part number is different between the 07-08 tl-s and the 08+ accord coupe so I gather they share the same bell housing but are different transmissions

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Old August 4th, 2015, 11:10 PM   #17
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What is the compatibity of engine accessories (power steering, alternator, ac compressor etc) between the j35a8 and the j30a4? I see different part numbers but I'm thinking that might be related to accessory brackets rather than the parts themselves. Just trying to make sure I'm not going to have to get new everything.
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Old August 12th, 2015, 04:58 PM   #18
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Not having any luck locating the tl-s trans, at least not one in my price range. I might have to breakdown and settle for the bell housing. Aside from the LSD are there any other benefits to the tl-s trans? Are the gear ratios the same or is the tl-s trans geared differently?
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Old August 12th, 2015, 05:01 PM   #19
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just the LSD. The TL-S tranney isn't stronger in anyway. Double check all the part number if you want to confirm.
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Old August 12th, 2015, 05:52 PM   #20
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If you want LSD and don't have access to a press, just get the base TL trans (same gearing as the accord), swap bell housing and you have the best setup to utilize the motor.
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Old August 18th, 2015, 07:16 AM   #21
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Is the tl-s ecu going to be required for the engine to start? Once I get the tl-s ecu I assume the dealer would have to program the immobilizer ? Last someone mentioned hondata, what do I need that for?
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Old August 18th, 2015, 08:41 AM   #22
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I have the ecu reprogrammed I can rent to you. There is a hondata thread on here somewhere
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Old August 18th, 2015, 09:21 AM   #23
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I have the ecu reprogrammed I can rent to you. There is a hondata thread on here somewhere
I'll definitely take you up on that. So the tl-s ecu is a requirement? Remember this is actually an RL motor that I'm going to mate to a 07 tl-s 6 speed transmission and drop into my 7th gen accord .
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Old August 18th, 2015, 10:16 AM   #24
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You can get away with a base tl 07-08 ecu, but u will need flashpro by hondata to reprogram the ecu so that you get the right mapping.
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Old August 18th, 2015, 11:38 AM   #25
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You need axles for the swap.

I also think stock ECU could handle stage 1-1.5 cams. If it took care of my DTB, I dont see a stage 1 having issues.
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Old August 18th, 2015, 12:04 PM   #26
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First time I've heard that I need to swap axles, guessing thet are A different diameter and or spline? If thats the case do the hubs still work? Any 07-08 TL axles or type s only?
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Old August 18th, 2015, 01:33 PM   #27
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You need axles for the swap.

I also think stock ECU could handle stage 1-1.5 cams. If it took care of my DTB, I dont see a stage 1 having issues.
But his using a j35 block. It will lean out up top.
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Old August 18th, 2015, 03:04 PM   #28
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But his using a j35 block. It will lean out up top.
Why would the ecu adjust a/f?
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Old August 18th, 2015, 04:15 PM   #29
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Why would the ecu adjust a/f?
stock ecu has set parameters and a threhold of how much threshold it can adjuest. you could probably get away with a j32a3 and the stock ecu,but not with the j35a8 and the stock ecu. also remember accord = 87 oct. j35a8 is 91
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Old August 18th, 2015, 04:41 PM   #30
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My buddy (member on here) is running a J35 on J30 ECU. Not saying it is working great, but his car does run and runs well. He is also completely stock, even stock J30 injectors. I know he's leaning out
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