BEFORE you flame me, read the post and see that i'm taking from experience and not some voodoo bullshit theory.

I have a USDM '98 ITR motor (the shittier cammed one compared to the 00-01 USDM ITR) and my friend has a '98 Spec JDM (210hp rating). We have the SAME ECU, intake, and both have cat-back exhausts. He also has a JDM DC 4-1 header. Only thing I've got that he does not is Skunk2 camgears (NOT tuned) and NO power steering.

We all know the results from the GREAT Header test from the ITR forum, in which the DC JDM 4-1 gave the similiar USDM motor a GOOD power boost - +12 with test pipe.

Anyways, we both dynoed and he got 1 more wheel hp than me. 175whp vs. 176whp. The only thing that could have affected his dyno was a slightly bent exhaust in 2 places where the muffler shop didn't bend it quite as "mandrel" as they should have. But still, with all the differences between the '98 JDM and '98 USDM the difference SHOULD have been bigger, right?

The '98 spec is supposed to have the 11:1 cr and better cams than my motor, yet it yields only 1 more hp even with a 4-1 JDM DC header.

How could that be?

In Japan do they not get better gas? And also, I think some of the hp ratings take the slightly better programmed JDM ECUs into account too. I ran the JDM ITR ECU and it was NOT as good as my Kenji-prepped P28 ECU that I run now. Also, the JDM '98 spec gets the much better than USDM JDM 4-1 header. AND the better cams too.

I would think that 11::1 cr, 4-1 header, and the better ECU and Japanese fuel should yield MORE than a 210hp rating when compared to the "inferior" USDM 10.6:1 cr, CAST exhaust manifold, "shittier" ECU, and shittier American gas. AND the shittier cams too.

BTW: If you read this Hurrell, don't be pissed - I'm not hating, and it's NOT a competition - I'm just trying to see WHY the dyno hp could be so close with similiar mods, that's all. I think 175whp and 176whp is very respectable for the mods given.

So?

 

ALL B18CSpecR are rated at 200ps. None were more.

But I agreee with you, its all the same *****.

 

Pre-'98 spec are rated at 197hp, while the '98 spec and up are supposed to be ratd at 210hp, right?

Still, you see my point?

 

Nope all B18CspecR were rated at 200ps (~197bhp)

 

Did you overlay the 2 graphs and compare not just peak hp?

 

i'm not a peak hp guy, but it should still be a bigger difference - no I didn't overlay. I haven't seen his graph yet.

I've always felt that people make a bigger deal about JDM motors just because they're JDM. My old B18C1 put out more whp than a pal of mine's B18C (SiR-G) JDM motor with same mods. Another example.

I know all motors are different, so has anyone else seen similiar results from experience?

 

its all hype

 

Steve just explained "JDM Fever" in a nutshell...

 

Lets not forget no two motors are the same even if they are identical. There are so many other variables you did not mention that affact whp like cap, rotor, plugs, wires, age of motor and how it was driven and cared for. Its also quite possible that your USDM R just happens to be a strong motor out of the box and very well tuned. BTW, what is average HP on a stock USDM R? 160-165?

AL

 

They are not identical. Although the difference is basically the pistons alone.

 

Japan uses higher octane gas like 100 RON or something close to that. That'll help a little.....

 

Like I said above, my USDM motor was NOT tuned. Original cap, button, etc.

As for the JDM motor? Don't know for sure.

If people are trying to make excuses to explain the ****, then fine, but I want to hear some more testimony from experience too.

 

Crushed bent piping is robing me of @ least 5 hp.
I dyno'd @ nopi and made 175 with some borrowed V-AFC settings. @ the dyno day I made 176 with zero'd out fuel settings. My car runs rich as hell.
My motor also had less then 15,000 miles on it and we know that these motors get faster with time and miles on them.

I'm confident once I replace my entire exhaust system (Wife banged the hell out of JDM DC) and get some of Jack's special sauce tuning I'm confident I can turn 185ish (Hoping for the higher side of 185, like close to 190).

I bought my engine because Import Auto Salvage wanted to much for the USDM ITR motor they had and it had 40,000 miles on it. I didn't get because its JDM. When I upgrade my pistons and cams I can always sell my stockers for decent money.

No harm Tom I've always thought that the differences between the JDM ITR and USDM ITR was cams (Not sure on that), pistons, and octane.

Once i get everything running right (exhaust wise I'll dyno it again before I get Jack to tune the V-AFC.

 

The '98 Spec and up JDM ITR produces more torque than the '95~'97 engine but all are rated at 200ps or 197bhp.

 

Which would explain I guess why my torque rating was 129 or 130 something like that.

 

Higher octane gas DOES NOT make you faster, it actually slows you down because it burns cooler. Now if you have high octane gas in your car you can run more timing, boost, spray, etc. then you will make more power. I am so tired of everyone thinking that if they run race gas their car will be faster.