B18C5-EH2

Sorry for the possible repeat topic, but I've searched with no sucess to answer some questions I have.

I'm looking for what makes the pre-05 K20A2 make 200hp vs. the 210hp of the 05 Type S, vs. the 220hp out of the ITR K20A engine.

I'm more certain of the Type R differences, but I'm kind of lost on the 05 Type S engine.

With B series stuff the hp difference between the GS-R and ITR was an astounding 25hp which actually translated into 25whp more for me personally over my old B18C1, so I'm wondering why the 05 Type S only makes 10 less whp than a JDM ITR.

Also I'm wondering how detuned the K20A-R might be as well. 220hp is nice, but if a fully tuned K20A-R engine only makes 10-15whp more than fully tuned 05 Type S engines do, then the price difference for a K20A-R engine doesn't seem worth it IMO.

As far as transmissions go, I'm aware that pre 05 models had the 4.400FD, while 05 models have the 4.78 like the JDM ITR does. Biggest difference between the R and 05 S would be LSD, which could be sourced from the likes of Quiafe if need be.

Thanks in advance for any help, links, etc.

Nikos

Good question.

The basic difference between the 2002-2004 rsx type S and the k20a R (all years) is the compression (.4 difference), the pistons, cams and some other head internals along with the manifold.

The k20a R piston is what makes the compression difference as you know. The type r cams give a little bit more power along with the type R intake manifold.

So 05 RSX type S, received upgraded cams and manifold and a different ECU. That is where the extra power came in. THe compression is still the same. I would not consider the 05 RSX type S at this point. (k20z) The tranny cannot be used with the current mounts ouf for eg/ek/ef Also there are small differences in the electrical part of the motor that are getting worked on.... So I would forget the k20aZ (2005 rsx type s motor) for now.

You are right. A fully tuned K20a R with a nice header and K pro will not see more than 220-230 in stock form..... (dynojet)

So if you are looking at this just by comparing the stock fully tuned numbers there are a few things to consider... The K20a r is rated at 100 octane where the type S motor is not. So the type S motor rensponds better to tuning on pump gas.

A stock type S motor will dyno on average 175whp with a stock ECU where the k20a r will go 185 on average.. With K pro that will become around 200 and so on...

Here's a good example.

k20a r
Stock w/ TSX Header




UNTUNED w/ Header (Red = Slight tune stock + KPRO, Blue = Untuned Header + KPRO)



and so on...

A stock RSX type S will never get there stock unless you do something in it or you have hondata tune it for you.

If you are going to pay close to $4000 for a type s swap, get a $5500 k20a r.

If you can get it from $3000 or less, get a type S and cam it +quaife it. IMO

B18C5-EH2

Damn.

I was really considering an 05 Type S maninly because of the verifired super low mileage, cheaper cost, and of course the added hp and the 4.78FD.

A friend of mine with an 05 Type S with nothing more than an intake and exhaust dyno'd 191whp on the stock ECU! He just added a Toda header, so he's expecting more next time out.

So I guess K20A-R it is then...

Nikos

Just so you know, another "problem" for the 2005 RSX type S is:

Installing the ITR PRC intake mani will not work. The MAP sensor location has been redesigned on the 05, thus changing the physical characteristics of the throttle body and intake manifold.

that means that with bigger cams, a new manifold will have to be made etc...
Also the speed sensort is located in the tranny as the TSX has it.

JDM2ndGen

nice info ...where do you get all this info from Nikos? your a k20 almanac

f1nal zeros

I have heard that the only thing the 05 rsx got was the ITR intake manifold, ITR header, ECU upgrade, Pistons, ITR final drive.

Just get a 02-04 k20 and do those mods or get the k20a (ITR) motor and be done with it.

Plus I have also heard that hondata has not made a flash for the k20z motor.

Halo

haha whats up Tom..never thought I would see you over on this end of town

NiPBoi

it gained the extra 10 hp from a free'r flowing catalytic converter and exhaust...thats what they said in car and driver...it also got all the other stuff people mentioned too.. <TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C5-EH2 &raquo;</TD></TR><TR><TD CLASS="quote">Damn.

I was really considering an 05 Type S maninly because of the verifired super low mileage, cheaper cost, and of course the added hp and the 4.78FD.

A friend of mine with an 05 Type S with nothing more than an intake and exhaust dyno'd 191whp on the stock ECU! He just added a Toda header, so he's expecting more next time out.

So I guess K20A-R it is then...</TD></TR></TABLE> thats why ur friend gained so much from just having an intake...

f1nal zeros

It also gained about another 100 pounds as well.