What Swap Should I Get FAQ

[davisj3537]

This all depends on your budget. If you are not incorporating Kpro into your budget then your choices are limited. I'll kinda touch this up the next couple of days.

Kpro not required but advised

K20a2-Must be used with k20a2 ecu. Great top end power but slow down low. Revs higher than anything else USDM. Has oil jets to keep the pistons cool

K24a1-Must be used with 310cc injectors with NO MODS. Great power down low and much cheaper than the k20a2. Does not make top end power or rev high like the a2.

K24a4-Must be used with 310cc injectors with NO MODS. Very similiar to the k24a1 but a little cheaper to buy. The cost saved on the motor will be spent fixing the water port issue.

Kpro is a must

K20a-Very hard to find and very expensive just like the K20A2 but it comes with different cams and higher cr pistons. Has oil jets to keep the pistons cool

K24a2-The most powerfull engine. Makes tq down low and makes power up top and still revs decently high. Has the same water port issue as the k24a4. Has oil jets to keep the pistons cool just like the k20a2 and k20a.

K24a1 block w/ A2 head- Great boost motor. Has no oil jets so you don't want to get too crazy on the stock block. This is called the poor man's tsx motor. It will almost reach the same power level as the stock tsx but falls short since the k24a1 block has a lower cr. The k24a4 block can also be used but the pistons MUST be swapped out.

Before you go asking any questions about this thread...do some fucking searching cuz the answers are probably out there.

[davisj3537]

If someone wants to write something up about the k20z3 and k20z1 then I'll add it in...I don't know much about them so I left them off till I get further info or feel like searching.

[Kodeen]

Why can't you use the k24a2 with its stock ecu?

[PAPITUYO326]

Its drive by wire, so there are no TPS sensor inputs.

Nice thread Davis. Don't forget to add the k24a1 to the list with kpro. Its a good motor with bolt ons and the right tune.

Also, I'm going to disagree with saying that you MUST run 310cc injectors. Its recommended, but the 270ccs have more than enough of a ceiling to provide acceptable fueling. You will run closed loop (no kpro, partial throttle) most of the time, so you will not have any fueling concerns there. Full throttle might be a little lean depending on the mods, but not enough IMO to warrant saying you can't use the 270ccs.

[davisj3537]

Its drive by wire, so there are no TPS sensor inputs.

Nice thread Davis. Don't forget to add the k24a1 to the list with kpro. Its a good motor with bolt ons and the right tune.

Also, I'm going to disagree with saying that you MUST run 310cc injectors. Its recommended, but the 270ccs have more than enough of a ceiling to provide acceptable fueling. You will run closed loop (no kpro, partial throttle) most of the time, so you will not have any fueling concerns there. Full throttle might be a little lean depending on the mods, but not enough IMO to warrant saying you can't use the 270ccs.

Oh I was trying to say that without kpro you have to have them...with kpro you can certainly run the 270s.

[blksi02]

good info. I would be interested to know exactaly what #'s the k24a1 block could handle incomparison to the a4 both with a2 heads on boost.. most likely going to be my next motor once i blow this a3 up

[davisj3537]

good info. I would be interested to know exactaly what #'s the k24a1 block could handle incomparison to the a4 both with a2 heads on boost.. most likely going to be my next motor once i blow this a3 up

Well the a4 is in a totally different cattegory since you have to change pistons to put on the a2 head. The a1 block will hold a good 400whp.

[koftaboy]

This all depends on your budget. If you are not incorporating Kpro into your budget then your choices are limited. I'll kinda touch this up the next couple of days.

Kpro not required but advised

K20a-Must have k20a ecu. Very hard to find and very expensive just like the motor below but it comes with different cams and higher cr pistons. Has oil jets to keep the pistons cool

K20a2-Must be used with k20a2 ecu. Great top end power but slow down low. Revs higher than anything else USDM. Has oil jets to keep the pistons cool

K24a1-Must be used with 310cc injectors with NO MODS. Great power down low and much cheaper than the k20a2. Does not make top end power or rev high like the a2.

K24a4-Must be used with 310cc injectors with NO MODS. Very similiar to the k24a1 but a little cheaper to buy. The cost saved on the motor will be spent fixing the water port issue.

Kpro is a must

K24a2-The most powerfull engine. Makes tq down low and makes power up top and still revs decently high. Has the same water port issue as the k24a4. Has oil jets to keep the pistons cool just like the k20a2 and k20a.

K24a1 block w/ A2 head- Great boost motor. Has no oil jets so you don't want to get too crazy on the stock block. This is called the poor man's tsx motor. It will almost reach the same power level as the stock tsx but falls short since the k24a1 block has a lower cr. The k24a4 block can also be used but the pistons MUST be swapped out.

Before you go asking any questions about this thread...do some fucking searching cuz the answers are probably out there.

how about the K24a2 can you rev high with that motor long block? and also do i have to get a 6 speed tranny for that swap or i can just use my a3 tranny with some mods??

[Mickey]

K20A ECU is not OBDII. Just use any k series ecu (USDM) with K-Pro and call it a day. You will not pass smog with the JDM ecu.

[davisj3537]

how about the K24a2 can you rev high with that motor long block? and also do i have to get a 6 speed tranny for that swap or i can just use my a3 tranny with some mods??

Depends on what you consider high. I wouldn't take it over 7800. Either tranny is fine.

[davisj3537]

K20A ECU is not OBDII. Just use any k series ecu (USDM) with K-Pro and call it a day. You will not pass smog with the JDM ecu.

Interesting...I didn't know that. So will the k20a run off a k20a2 ecu without kpro is the next question. I know kpro is optimal but will it run without any codes...anyone know?

[Mickey]

Interesting...I didn't know that. So will the k20a run off a k20a2 ecu without kpro is the next question. I know kpro is optimal but will it run without any codes...anyone know?

It will not run without K-Pro.

[davisj3537]

It will not run without K-Pro.

UPDATED. Thanks Mickey

[ALep3]

you have a link to the water port issue for a K24a4 I'm getting a great deal on one but dont want to much of a hassel I thought all I had to do was change the water pump housing.

edit nevermind I found it

[frm_808]

sticky sticky!!