11th Gen Civic Si Engine Swap

[Crisspy]

Disclaimer, this purely me just trying to learn, and don't plan on doing something like this anytime soon, unless it really isn't that big of a project so just bare with me.

If someone were to hypothetically put the new Type R engine in the new Civic Si. What things would have to change for something like that to be possible? Im assuming you would also need to swap the Transmission as well. (Also don't want to hear "why don't you get a Type R instead") Would the Chasis or frame need to be modified? What are other potential things that would need to change for a build like this to be possible. And if you can throw a ball park cost of what it would take to make this possible that would be interesting to know (100% understand this would not be a cheap endeavor at all) as well as what types of places that would be designed / capable for projects like this.

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[Integra23]

I know you can buy a crate engine from Honda with an ECU. You would need the transmission as well. I believe a sticking point mentioned in a 10th gen forum was the axel would need to be custom. With the CTR front suspension being a dual axis and wider, these shafts won't fit.
https://www.autoblog.com/2021/02/09/honda-civic-type-r-crate-motor-controls-package/

 

[keller]

I have seen this topic a few times on civicx. The Type R has a bosch ECU, which means you'd need to replace a ton of harnesses to complete this swap. The most promising option seems to be the K20C4 accord 2.0T engine. At least one guy seems to be actively trying this swap.

 

[Crisspy]

I have seen this topic a few times on civicx. The Type R has a bosch ECU, which means you'd need to replace a ton of harnesses to complete this swap. The most promising option seems to be the K20C4 accord 2.0T engine. At least one guy seems to be actively trying this swap.

I've also been seeing this, I am a little confused though. I see that the Type R engine is the same as the 2.0 Accord but there is obviously something different, where is the extra 50 horsepower coming from that the accord doesn't have?

 

[keller]

I'd say the smaller turbo and the fuel system are the main reasons. The good thing is that once you get a K20C4 running, most upgrades from the Type R can be installed. There's this YT video with some details about the differences:





I'm no expert though, but if you are in for a good reading you can follow it here https://www.civicx.com/forum/threads/how-to-k-swap-your-si.80693/

 

[TypeRD]

Dang…I recall reading a short article on the differences a few months ago. I can’t remember where now tho, but it was pretty clearly explained. There are indeed differences between the Type R engine and the 2.0 turbo used in the Accord etc. It isn’t just ECU programming. I know the turbo itself is different. I think there are some other aspects for strength and lightweighting in the Type R engine as well that aren’t in the Accord engine.

If I were to do a project like that, I’d probably look at the Accord engine plus Hondata tune first. 3 reasons : 1. Availability. 2. Cost. 3. The Type R crate engine cannot be bought for street use…though there are perhaps loopholes.

 

[chopsuey34]

You will probably have to modify your suspension to prevent torque steer because the Type R engine is making 315hp stock. But people boost their 1.5T's up to 400-500hp so it's doable.

 

[Romeoridgee]

Getting a type r ecu to communicate with other modules not designed for the same protocols or information/messages can be tricky. someone swapped an si gauge control module in their hatchback (10th gen) and the tachometer didnt work because the si used different signals. i know the ctr has different connectors for engine sensors. type r ecu has more pins on both connectors as well. c4 swap is your best bet as the same engine sensor connectors are used. would need engine, trans, custom axles, maybe minor mods to the engine harness, retain stock ecu.

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