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Author Topic: Motor/ECU Swap Key Question  (Read 21336 times)
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BlK24a8
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« on: June 23, 2009, 10:05:28 AM »

I tried calling honda the past few days in regards to the car keys. I'm to understand that there is a chip in the key that starts the car, the car reads the chip and yada yada yada. My question is if I swap out the a4 motor for the a8 motor would that effect the car/key in any way or is it only the ignition that is read not the motor and ecu?
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Mike
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« Reply #1 on: June 23, 2009, 10:08:27 AM »

I would imigine that the communitcation is done with the ECU.
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timot_one
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« Reply #2 on: June 23, 2009, 11:27:16 AM »

I'm pretty sure it has to do with the ECU.  Why are you going to swap in an A8 in place of an A4?  For all the trouble you're going through to swap motors, there are better upgrades.
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« Reply #3 on: June 23, 2009, 12:07:03 PM »

do an a4 to an a2 swap... then you can get some really nice gains... Cheesy
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BlK24a8
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« Reply #4 on: June 23, 2009, 01:02:39 PM »

I'm sorry guys that was a typo. I'm swapping out the a8 for an a2. The main reason for my idea was the a4 is readily available fair price and most important has been tuned. I thought about the a2 but I would rather build a cheap motor then build a 2k motor. I spoke with some guys at honda and they all pretty much said it would not effect the key and start up. I figured I would ask the guys here. I have seen all these frank motors and what not and no one ever mentioned anything about the keys or anything. As of right now I'm getting all the part's for the build just wanted to square away the motor/swap side of it.
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« Reply #5 on: June 23, 2009, 03:24:56 PM »

What do you mean the motor has been tuned?  You do realize that the K24A4 has less power than the K24A8, right?  Are you building a motor, or are you just swapping motors?  Your posts are kind of confusing and really don't make much sense because your information is not consistent and extremely vague.  I understand the whole key issue, but I'm not really sure what you're trying to do with the motors.  Why don't you just tell us what you're planning on doing so we have a better idea?
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BlK24a8
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« Reply #6 on: June 24, 2009, 12:04:14 AM »

Sorry about that. I do know the a4 has less power then the a8. I and the shop who will be doing the work came up with 3 possibilities for the build. This might be a bit lengthy. These are the 3 options we came up with. The reason I asked about the key is because 2 of the choices entitled a motor swap. I have seen swaps done in 7th gens but no one has ever said anything about the chipped key. I was able to grab a hold of someone at honda today and they pretty much said it was the ignition and not the ecu. Either way I figured I would seek the help from the community. So here where the options.

1-Stick with the a8 and try to figure a way to tune the motor. No one has been able to crack the code to tune the motor. Hondata came out with a new system for the TSX that can control DBW and the auto trans. It's a duel adapter harness. I'm sure many of you have seen it if you check out their site. They said this could possibly work IF they where able to get it to work with my ECU.

2-Swap out the a8 for an a4 motor. Yes the motor has less power but it's going to be boosted so there is no real concern about the power loss there. Many people have swapped the a4 into other cars and the a4 motor has been tuned for aftermarket performance. This option was one of their higher choices just because they are easy to find and cheap. Not to mention they have worked on a few a4's already.

3-Swap out the a8 for an a2. This option can allow them to use the new tuning method from hondata, and give me a little more hp starting out also. This I would pretty much just have an accord body with a TSX guts.

The goal is ball park 230-250whp just a little something fun to drive around it. I sacrificing power because I'm going with price and reliability. I will be building the bottom end to handle the power and beefing up the auto trans(B&M trans cooler included). Everything is pretty much accounted for however the shop recently called and suggested one of the 3 ideas. they said they are willing to work with the a8 but as time passed they said they might suggest another motor as a platform. So the key question came about over the swap ordeal. First they said no problem did a little reasearch and now they are willing to try but suggest an alternative.
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« Reply #7 on: June 24, 2009, 12:45:35 AM »

i suggest you either get a k24a4 + headswap + rsx-s oil pump +high compression piston + hondata + good tune, or if you have enough money just get the TSX motor + bolt on + hondata and a good tune. You can break 250whp easy.

I would suggest the k24a2 because of the oil squirter and it has better bearings.

It all depends on how much money you can put in and how much down time you can afford.
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« Reply #8 on: June 24, 2009, 01:02:28 PM »

Ok..nobody post right now....I'm writing a novel on this argument that will be the knowledge bomb equivalent of Hiroshima and Nagasaki combined.
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« Reply #9 on: June 24, 2009, 01:04:04 PM »

Blk good to see ya here man!.... post deleted for Skip's novel!

As for the a8 making more power than the a4 Ive heards theres two main reasons and thats the differences in the manifold designs and slightly revised camshaft designs. Although the a8 pistons may be different they still have the same compression ratio as the a4s. Obviously tuning is slightly revised as well.
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BlK24a8
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« Reply #10 on: June 24, 2009, 01:12:41 PM »

Thanks Blinx. I noticed most of the same people here as on the original gen 7 forum. Thanks that was pretty much my question answered in a nutshell lol. I was really considering the a2 swap mainly because it would be so much easier to get hondata up and running since they make a application for the a2. How do you deal with that since you went the frank route? Take your key to honda and have them sink it up?

Skipp...go easy lol I'm still recovering from the rant a year or so ago on k-pro lol
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timot_one
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« Reply #11 on: June 24, 2009, 01:23:14 PM »

Run for cover fuckers.  

Are you planning on switching from a DBW throttle body to a cable driven throttle body? Each time you post, something new comes to light.  We can't really help you if you don't tell us what your plans are.  Withholding information will only make this more difficult for us to help you.  The people that can help you will lose interest and not bother helping you if you're a pain in the ass about it.
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Tim
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« Reply #12 on: June 24, 2009, 01:35:23 PM »

Quote from: "timot_one"
Run for cover fuckers.  

Are you planning on switching from a DBW throttle body to a cable driven throttle body? Each time you post, something new comes to light.  We can't really help you if you don't tell us what your plans are.  Withholding information will only make this more difficult for us to help you.  The people that can help you will lose interest and not bother helping you if you're a pain in the ass about it.


thought I covered it...The reasoning was to lose the DBW yes. The shop was willing to try they where just trying to eliminate any issues with the motor resisting the tune. that is why they suggested the a2/a4 motors because both have been performance tuned and have applications on the market that can tune them. Hondata being the application for the a2.
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« Reply #13 on: June 24, 2009, 01:46:21 PM »

I didnt know anyone saw my reply I deleted it pretty soon but all good,.. the only reason I havent said anything about using the Fpro application is because your AT. Other than that Id go with the a2 swap/frank build and use the TSX dual harness since its DBW anyways. Not sure how much else I can help on this though :-/
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timot_one
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« Reply #14 on: June 24, 2009, 01:50:28 PM »

So, get a cable driven TB and run the new throttle cables.  I'm not sure if you have to replace the pedal also.  Have you considered that option?  I don't see why you shouldn't be able to run the dual ECU harness that Cham makes for us and run your car on kpro.  Where do you live?  Maybe Cham can help you with this.  I realize that it's more complicated than that, but probably less trouble than a motor swap.
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Tim
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Eating gold is like the equivalent of wiping your butt with dollar bills.  At some point, it's going to come in contact with my ass...just doing it in a more elegant way.
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