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hey guys, if this is a repost please feel free to flame but please post a link to the other thread...

between the k20a-and a2 what are the differences besides horsepower. I know its the same block so Im assuming that the head is different? maybe a better tuned intake mani and exhaust header? Im wondering because Im thinking of doing a swap and the k20a is cheaper, so if I went that route and just got a cam, valves, springs, and retainers and also a port a polish job would I be in the same level as a a2 or are there other differences between the two? Thanks for any help in advance.

 
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from what i understand... the K20A motor has better cams, intake manifold, exhaust, and head (not sure about the head). there may be a few more things here and there. but it also depends on what year motor you get. The newer K20A2 motors came with the same cams and exhaust as the K20A; thats what they did on the '05-'06 RSX-Ss.

 
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doesnt the A have a higher compression than the A2?

 
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The 05-06 rsx-s have the K20Z1 which is drive by wire throttle system, the new 06 civic si has the K20Z3 I believe.

 
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oops, you're right. the K20A does slightly higher compression than the A2.

 
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Diff compression ratio

 
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k20z1's aren't drive by wire.

 
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ok so the a has a higher compression ratio but other then that they are almost identical?

 
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i think so. well and they are uber JDM cause they are out of a type r

 
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Are you sure about that, because I wanted to swap one and decided not to becuase of that issue. And if you want hondata you can't just swap into a PRB ECU, you must also swap the intake manifold.

 
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the k20z3 is drive by wire, the si, the rsx-s 05-06 are not wire to my knowledge. but compression is the main difference along with cams, etc.

 
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The K20a runs different cams, has a higher compression, has a LSD, more aggressive gearing, and of course comes with the red top. Most people say that it does not boost as well as the k20a2 becuase of the higher compression. The problem is they cost around 1K more than a K20a2 and are harder to find in great condition. Also you would be running the PRC ecu vs the PRB ecu, the one advantage to the PRC is you don't have an immobalizer, and therefore don't nessecaraly need to go with Kpro. However, you do have a speed limiter of 110mph, so most people end up going with Kpro anyway.

The newer K20z1 engines, I believe are drive by wire. They have the more aggressive cam and gearing that the K20a has, however they do not have the higher compression or the LSD. Swapping these are made difficult due to the fact that you can't use kpro so you would need to take it into a Acura dealership to get the immobalizer reflashed so you can start the car. You can also swap into an older model PRB ecu or a PRC ecu, however as I stated before it is not just as simple as swapping ECUs.

Hope this helps

 
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^^I think he got it...lol
+1 rep

 
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how many times do i need to post this up.. shesh..

 
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as many times as there are posts like these lol

 
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so you can get a k20a that is less hp than the dreeded k20a3

 
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there are different types of JDM motors... so having a k20A doesnt necessarily mean it will be the TYPE R version with more HP.. i got a JDM motor at the time nobody knew... everyone thought all JDM motors from japan was type R... come to find out my motor was a JDM TYPE S.. lol... who knew... but as of now i do put out 201hp on the dyno.. lol

 
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so how can you tell? reguardless if i swap im going with a k20a3 and boosting it, but just incase how could you tell which k20a you have? like the TYPE R and the TYPE S are idententical except the HP/TQ

 
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well the from what i noticed the JDM type s came with a silver valve cover instead of the red... if you open up the valve cover you will only see 3 intake lobes and 1 exhaust lobe compared to the 3 in and 3 out of the type r

 
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-_-;

the k20z1's are not drive by wire.

 
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not trying to be an *** but yes they are. The TSX which also has the z1 is drive by wire. I would assume that the RSX is as well.

http://www.acuraworld.com/forums/sho...d.php?p=979276

 
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I am currently having a K20Z1 swapped. The tech working on the swap said my K20Z1 was not drive by wire and can use a normal throttle cable. This motor is from a 2005 RSX Type S. Here's a pic of my throttle body area. http://www.7thgencivic.com/forums/at...3&d=1147817304

Here's the link to my swap. http://www.7thgencivic.com/forums/sh...d.php?t=261528

 
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gee.. can this thread be dummied down any sooner.. not trying to be an a$$.. but


come on... you guys gotta remember that a k20z can come iin any form..

drive by wire or not....

the only thing that does make it a drvie by wire is the type of throttle body used on the motor.. i mean i could take a type r k20a and make it a drive by wire if i wanted too...

all rsx from 2002+ use a throttle body cable... as oppsed to something like the tsx which uses a little servo motor to open and close the throttle body...


misinformed people going around saying things doesnt help this topic either...


so hence... both answers are correct... but it also depends on the car it came out of... i mean if you have a 2002-2005 civic si it uses a cable for the throttle body but when you get a 2006 civic its drive by wire.... if one person told me the si civics with k20's in it are all cable then YES they are correct.. now if another person told me the same thing but said it was DRIVE BY WIRE then they are also correct... but WHAT is wrong with that picture??... the years they came out of the civic si...

so please get your info straight cause it can lead to endless topics like this about who is right and who is wrong

 
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haha i believed derek the first time he said the k20z1 didn't have drive by wire. and you can't assume that cuz they use the k20z1 in the tsx, that they're going to use exactly the same components on the rsx-s. you spoke too confidently, and got humbled.

 
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oh lordy.

tsx is k24a2.

 
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this is done. Read the FAQ if you have more questions.