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How to tell the difference between the K20R motor from a Civic R and Integra R.

7.7K views 28 replies 21 participants last post by  GST2RSX-S  
#1 ·
Hey i wanted to know how to tell these motors apart. Let me know. Thanks again
 
#4 ·
I have a ctr K20a and there only difference that i saw was that on the side of the motor(left side if you are standing in front of the car) on the itr there is a sticker that says PRC-k20a, the CTR does not have that, it has something like PRA2-xxxx. that is the only diiference that i have seen. but the intake manifold both say PRC but the transmission have different codes also,
 
#7 ·
Soda Popinski said:
I swore that CTRs were less power than ITRs. Like they all they were, were red top RSX S motors. Dunno, call me dumb but thats what i heard.
CTR is lower hp than a DC5-R engine, about 5hp to be exact. This is because of the factory exhaust manifold design. Soon as you put a header or even swap a DC5-R exhaust manifold onto a CTR K20 engine you'll gain back that 5hp.
 
#10 ·
chameleon said:
but why a different ecu ?
maybe because of the electric steering?
 
#11 ·
katman said:
CTR is lower hp than a DC5-R engine, about 5hp to be exact. This is because of the factory exhaust manifold design. Soon as you put a header or even swap a DC5-R exhaust manifold onto a CTR K20 engine you'll gain back that 5hp.
that dosent sound right, why would you takeaway HP's in japan, U.S yes, but in JAPAN ????
 
#12 ·
B20VTECHUSTLER said:
that dosent sound right, why would you takeaway HP's in japan, U.S yes, but in JAPAN ????
Katman is stating that the design of the the exhaust manifold on the Ep3 Ctr is designed differently which might account for the different power rating. In other words the Ctr header is a bit restrictive. It was probably disigned different because of clearance issues.
 
#13 ·
Internally, the CTR and ITR motors are identical. Jon V is probably on the right track as to why the ECU P/N's are different.

I'm currently running the CTR ECU in my EG hatch and I layed down 205WHP on a dynojet. I'm only running the Hasport header w/ 2.25" exhaust. I thought that was pretty impressive for the stock CTR, being that my exhaust setup sucks and I'm not running K-pro.
 
#14 ·
The jdm integra type r and jdm civic type r use the same motor.

There are different reasons why they rate them differently. For one the header is different and the ecu is different.

Why? Well, for a few reasons... marketing for once... It is never a good idea to sell 2 cars with identical specs... At the same time, they don;t want to make it look like one is way better than the other one.

Nikos
 
#15 ·
I would think you would be able to tell the difference between the 2 based on that the EP3R doesnt have a power steering pump whereas the DC5R does. The EP3R has an idler pulley in place of the power steering pump.

The Exhaust Manifold must be really restrictive as has been stated here, but i thought EPS on the EP3R would make up for this. I suppose not.
 
#18 ·
kmar111 said:
I have a ctr K20a and there only difference that i saw was that on the side of the motor(left side if you are standing in front of the car) on the itr there is a sticker that says PRC-k20a, the CTR does not have that, it has something like PRA2-xxxx. that is the only diiference that i have seen. but the intake manifold both say PRC but the transmission have different codes also,
PRA is the code for the UK spec CTR motor, which is essentially a k20a2, a JDM CTR is PRD
 
#19 ·
This controversy is just getting old. They are the same motor, plain and simple.

If your Honda though, you can't sell a more expensive ITR to the consumer if the CTR is the same...or better for that matter. So a more restrictive exhaust, maybe a little more conservative tuning in the ecu leads to a little less power. In addition, a different manifold design will certainly require a different tune due to scavenging differences.

Chevy has done it for decades with the Camaro and the Vette. GM whores out the Corvette powerplants to any chassis they can fit it in (Camaro, Impala SS, Corvette, etc. in the early 90's). Exhaust differences always led to a downgrade in power so that the Corvette would be the undisputed leader. Fact was, the LT1 was the same in all the cars. Simple marketing
 
#20 ·
RC000E said:
This controversy is just getting old. They are the same motor, plain and simple.

If your Honda though, you can't sell a more expensive ITR to the consumer if the CTR is the same...or better for that matter. So a more restrictive exhaust, maybe a little more conservative tuning in the ecu leads to a little less power. In addition, a different manifold design will certainly require a different tune due to scavenging differences.

Chevy has done it for decades with the Camaro and the Vette. GM whores out the Corvette powerplants to any chassis they can fit it in (Camaro, Impala SS, Corvette, etc. in the early 90's). Exhaust differences always led to a downgrade in power so that the Corvette would be the undisputed leader. Fact was, the LT1 was the same in all the cars. Simple marketing
Not so plain and simple, a Euro Civic has K20A2 and the JDM Integra is a K20A, Different pistons, cams etc which is the only model you can buy in Europe as an import.
 
#23 ·
macer said:
Not so plain and simple, a Euro Civic has K20A2 and the JDM Integra is a K20A, Different pistons, cams etc which is the only model you can buy in Europe as an import.

Yes the EURO Civic type R is a k20a2 with different cams, pistons etc etc but the Japanese(JDM) Civic Type R and Integra Type R are both k20a's and are identical as far as pistons, cams etc etc. The only difference is the Exhaust Manifold and ECU.
 
#25 ·
aznboysrfr said:
I've seen pics of the ctr exhaust mani and it looks nearly identical to the itr one ... so I don't think the differences are in the ex. mani ...

electric power steering should bring the ctr's hp higher than the itr motor ... but it's still rated lower ... :|

Remember though...The CTR motor is only rated at 5 CRANK hp less which is not much at all...So the smallest difference in the manifold could take away that little amount of power. Plus the ECU may have small changes to the air/fuel to accomidate the minor differences in the manifold.
 
#26 ·
who cares.... either way you are getting a badass motor with a great tranny and a lsd. K pro can fix any hp "problem" you are having. If anything other than the header it may have slight changes in ignition or cam angle or the a/f, really the only way to tell would be to datalog each motor in a climate controled room and both motors having the exact same header for each test.