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Discussion Starter #1
I know there are older threads on this, I've just been trying to get some more information on modifying my R18. According to some, you can run certain parts from an R20 (cam, crank, oversized pistons, amongst a few other things). I'm wondering if anyone knows someone who has successfully done this, or has any info on what I can do to find out what will work and what wont.

Thanks!
 

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Discussion Starter #5
They use an R20 in new Acuras and some other Honda models. So, displacement, power, the list goes on. I get why many think it's easier to trade it in for something else. However, this is my car and I put too much into this to buy someone else's problems.
 

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Absolute best case you make 15 more HP than an r18. Thats still 40 shy of an si. Not to mention the aftermarket support. No one will know you spent thousands of
Dollars putting an r20 in unless you tell them.
 

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You are way better supercharging your R18 if you do not want to go the way of the SI. I can tell you that dropping IHE+tune in your r18 will disappoint you if you go drive a regular SI. Your really missing out what a special motor the k20z3 is. I'm making 360hp with a Kraftwerks SI, and I have been smashing on cars left and right that are way out of IHE+tune SI's league. It's almost too much fun.
 

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Discussion Starter #8
Thanks for the replies guys, I know the k20 is special, but I fell in love with this car. I've been looking at the JR supercharger, and to be honest the gains wouldn't really match the amount of money for what I was talking about. I was more interested in having a larger displacement and the ability to handle/produce more power. The ilx comes with the R20 and only makes 150 with the stock motor, so I appreciate the advice. Im making more than that with the mods I already have so I guess 4k would be better spent on the supercharger.
 

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Absolute best case you make 15 more HP than an r18. Thats still 40 shy of an si. Not to mention the aftermarket support. No one will know you spent thousands of
Dollars putting an r20 in unless you tell them.
It wouldn't be a swap. The r18 and r20 use the same block, the 0.2 is made up with the crank, pistons, etc. But you guys are right it isnt worth the money unless it was dirt cheap.
 

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I may be a little late on this, but I think that it's better to turbo charge the r18 vs the r20. Turbo chargers increase oil compression and so does vtec. Turbo charging an si makes it harder to use the full potential of vtec and the turbo charger and you have crazy oil compression, which will cause the engine to blow. While the r18 doesn't have vtec, you can have higher psi and take full advantage of turbo. But as you said earlier, replacing certain parts of the engine with r20 parts, I believe its doable, if you know what you're doing.
 

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I may be a little late on this, but I think that it's better to turbo charge the r18 vs the r20. Turbo chargers increase oil compression and so does vtec. Turbo charging an si makes it harder to use the full potential of vtec and the turbo charger and you have crazy oil compression, which will cause the engine to blow. While the r18 doesn't have vtec, you can have higher psi and take full advantage of turbo. But as you said earlier, replacing certain parts of the engine with r20 parts, I believe its doable, if you know what you're doing.
Wat?.....
 

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Dude I honestly dont have a clue of what you are trying to say man. Doing any kind of upgrades to an economy engine like the r18 will not yield as many gains compared to a k20. However you are very wrong when you said that its better to turbo an r18 than a r20, an r20 is essentially the same as a r18 only with a bigger displacement due to the stroke, they are the same engine in every other aspect. The r20 having a larger displacement will yield a larger gain compared to an r18 assuming we have the same turbo setup. Turbo does not increase oil compression, but I think you meant oil pressure. could you elaborate on what you meant by this? Vtec engine can be turboed there are some pros and cons of turboing a vtec engine, it all depends on what your goals are. Theres a couple of threads on honda tech and other websites regarding this subject. The r18 and r20 have vtec, however is not the high lift vtec that a k20 has, its a econo-vtec, temple of vtec asia has a good article explaning this. Both engines can take advantage of a turbo again it all depends on what your goals are.
 

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At the end of the day it's beyond cheaper to turbo or supercharge the r18 compared to this r20 none sense nobody has done this for a reason if I'm going in on the block which I will later on I'm doing a built r18 block so it can handle more psi etc vs basically dropping in stock r20 parts I prefer a built motor.

This whole bs r18 fight about making power is laughable you can tell you r18 users that want to make power but don't read or even bother to do research on power gains with this motor. I'm gonna say it again I know for a fact 324 whp is reachable I know one person that done it with a built shorty only let's add some headwork in there and see then.

Folks have made 188whp- 286whp I seen non built motor. Your more then doubling the stock output on top of that the car is light weight? What more do you need that's a ton of power for this small car it's not heavy. So many power hungry r18 owners yet they don't bother to see all the plethora of parts out to gain power. This is not a SI if you want to wake up the r18 the first mods should be force induction and flashpro period then build around it.

It's a totally different car then you can do suspension mods brake mods etc etc etc list goes on. There is no cheap way to make power on any car. Swapping in a r20 will cost more then force induction. Sooo why don't some of you r18 owners stop do research visit the turbo thread and the turbo r18 Facebook site as most are on there and see what kind of power is going on and total cost invested. Yes there are supercharged owners there as we'll. If your unwilling to go the force induction route then don't complain about power just do that stance crap or trade your car in. Or build for looks not power.

Remember 95% of the parts they make for a si the r18 has a equivalent version just will not produce the same power gains. Either way you go whether you trade in for a si or mod r18 it will cost money more power equals some cash flow to get there. Want to save money buy used parts as they show up. It takes sometime and waiting for sure ask around post wtb threads looking for parts I personally have had great success in this market you will be surprised the total cost of my turbo build once I finish. These are all name brand parts nothing I custom put together

Just take your time save your money don't waste it on stance crap or rims or interior mods or suspension unless you find killer deal and I mean killer deals. Save up 3500 get a turbo kit or supercharger kit with flashpro. Then get it installed and tuned. It will not be over night and will be the course of a year or so but worth it once it's done and you can move on to different phase of making real power.
 

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Okay, first off, I own a 07 Civic Si. I never said the r18 is stronger than the Si, I only said that turbo is more suitable for the r18.

Supercharging the r20, in my opinion, is a much better option for the si, only because it can only handle so much psi ( again, due to vtec). You'll blow your engine if you have too much pressure with turbo ( and also superchargers, but it's much safer with superchargers).

There's a reason why evos and imprezas can handle 20+ psi and our engines can't. Do not get me wrong, I love my car and engine in every way, but I am no bias to only my 07 Civic Si sedan.

I have spent a year debating on whether I should go turbo or sc, so don't think that I haven't done research on this. Turbo is doable on a r20, yes, I have never denied that.
 

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Had my R18 turbo'd for 16mths, 7 psi 245hp on E85, 10 track days, bottom end went at 90,000m, chucked another motor in and it lasted 5 days at 10psi bout 290hp, bent a rod loading it up from low rpm, the sohc with e85 spools the littl3 T25 early at 1700rpm and belts like small block V8 all the way to 6800.

So unless they've upgraded the rods substanially then I dont think an R20 turbo has anymore potential.

Save ya money get an SI if ya want reliable cheap power, I did the long road finally built a K20/24, got a fd2r subframe and sump slapped a wing, TLS brembo's and it now does fair impression of a racecar.

there were cheaper options, but hey ask yaself how far ya want to go ?
 

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You are way better supercharging your R18 if you do not want to go the way of the SI. I can tell you that dropping IHE+tune in your r18 will disappoint you if you go drive a regular SI. Your really missing out what a special motor the k20z3 is. I'm making 360hp with a Kraftwerks SI, and I have been smashing on cars left and right that are way out of IHE+tune SI's league. It's almost too much fun.
I need a
You are way better supercharging your R18 if you do not want to go the way of the SI. I can tell you that dropping IHE+tune in your r18 will disappoint you if you go drive a regular SI. Your really missing out what a special motor the k20z3 is. I'm making 360hp with a Kraftwerks SI, and I have been smashing on cars left and right that are way out of IHE+tune SI's league. It's almost too much fun.
Hey I need a supercharger kit for my R20A, who can hook me up to a link to purchase this or someone selling one I'd like to buy
 
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