About a year and half ago I purchased a 2000 JDM ITR swap with the hope of making 200 whp without taking the head off. Stock compression, stock valvetrain.

I chose my aftermarket parts very carefully and with much research here on honda-tech.

Skunk2 stage 1 cams
J's racing intake
An-R compact header
2.5 mandrel bent exhaust
70/66 overbored throttle body
AEBS intake manifold
Outlaw engineering gasket kit
Clutchmasters flywheel
DH-racing crank pulley
Rocket plugs
Hondata s100 tuned by sgt
stock 290cc injectors

Pictures and details of the motor can be found at:

https://honda-tech.com/zerothread?id=844913

And here were the results:




Now, I realize that peak numbers are pointless and that area under the curve is what you are going for. I also realize that making 10 more peak horsepower wouldn't make that much of a difference for my car. But I am a numbers dork and enjoy the challenge of trying to make NA horsepower. So how can I do it? The challenge is to do it with stock compression and valvetrain.

Here are my ideas for now. The stock 290 injectors were maxing out the duty cycle so we had to up the fuel pressure to 60 psi. Now the injectors are at about 93% duty cycle. I think that I could gain some tunability with larger injectors. Would 310s be big enough? I also think that there are whp to be made with a better header. I have the street collector on the an-r header and think that an SMSP header would give me a few whp. A grouding kit is another idea.

What else? How do I do it?

 

Perhaps you can try porting and smoothening out the AEBS intake manifold since pictures (one I have seen) show that its a rough casting. That should be good enough for some horses.

 

The new dh-racing throttle body 74 opening-67 mm plate and have the manifold cleaned up. Very nice #'s.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alld16a &raquo;</TD></TR><TR><TD CLASS="quote">The new dh-racing throttle body 74 opening-67 mm plate and have the manifold cleaned up. Very nice #'s. </TD></TR></TABLE>

I think that a 74/67 TB may be overkill for my setup. I will definitely consider cleaning up the AEBS. It is nasty inside that thing.

 

solid numbers but your tq seems kinda low, i'd be curious to see what it would do with just a stock itr tb

 

Port the Intake Manifold (Portmatch the TB and Head)
Play with Different Oil
Play with the lash on the cams...(Rule of thumb, tighten the intake, loosen exhaust)
I would try a straight 3" Pipe, Headerwrapped...instead of the J's Intake.
Check for restrictions in any airflow path (Minimum 3" Intake\2.5" Exhaust).
Compression\Leakdown the Engine (Looking for Even CR #s and &lt;4% Leak)




Modified by Suprdave at 8:43 PM 6/27/2004

 

There's not a whole lot you can do without starting to dive a little deeper into your build. Could you have sgT retune your cam gears and timing maps on Hondata to make more topend? Also get larger injectors to give you more ability to maximize tuning. Then to finish it off get MSD ignition box, coil, etc. I've seen this make a few whp on NA motors. All that might be able to get you to 200whp.

 

a ground kit would give around 2whp. maybe flat faced valves and mill the head but i dunno if u want to change it because u said u wanted stay stock compression.

 

people you are forgetting the obvious!!!! HONDATA INTAKE MANI GASKET!!!!!!! and some other stuff other people have said. Hmm unless the outlaw gasket is the same thing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Suprdave &raquo;</TD></TR><TR><TD CLASS="quote">Port the Intake Manifold (Portmatch the TB and Head)
Play with Different Oil
Play with the lash on the cams...(Rule of thumb, tighten the intake, loosen exhaust)
I would try a straight 3" Pipe, Headerwrapped...instead of the J's Intake.
Check for restrictions in any airflow path (Minimum 3" Intake\2.5" Exhaust).
Compression\Leakdown the Engine (Looking for Even CR #s and &lt;4% Leak)


Modified by Suprdave at 8:43 PM 6/27/2004</TD></TR></TABLE>

The intake manifold is already port matched to the TB, but I can't port match it to the head because this would require pulling the head off (against the rules). Different oil may be a good idea. The lash on the cams is whatever spec skunk2 recommended, but I could play with that. I tried a straight 3" pipe and the J's beat it out. I will have to take a look at the exhaust, but I don't believe there to be any bottlenecks, although there are quite a lot of bends in an EF exhaust.

Thanks for the replies. Any others?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Thrillhouse &raquo;</TD></TR><TR><TD CLASS="quote">people you are forgetting the obvious!!!! HONDATA INTAKE MANI GASKET!!!!!!! and some other stuff other people have said. Hmm unless the outlaw gasket is the same thing.</TD></TR></TABLE>

The outlaw kit is the same as the hondata gasket. Outlaw also gives you a TB gasket and IACV gasket.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mike95lude &raquo;</TD></TR><TR><TD CLASS="quote">Then to finish it off get MSD ignition box, coil, etc. I've seen this make a few whp on NA motors. All that might be able to get you to 200whp.</TD></TR></TABLE>

Anyone ever see gains simply from the addition of an MSD ignition box?

 

MSD Box might let you run a larger spark gap...making more power.

You wanna run as large of a gap as you can without misfire.

There's power there...also experiement with different plugs...put in new plugs.

10whp can be had with some work...

 

run open headers and put bak that jdm throttle bosy it 62 mm it good for rite now l

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civic2003 &raquo;</TD></TR><TR><TD CLASS="quote">run open headers and put bak that jdm throttle bosy it 62 mm it good for rite now l</TD></TR></TABLE>

sorry...one of the other rules is that it has to have a full exhaust. The car is a streetcar with full interior and full exhaust.

 

http://www.importreview.com/reviews/TB62vs68.html. Billet throttle bodies make good power throughout vs 62 mm on basic street motors.

 

switch to an electric water pump
install a crank scrapper
improve your PCV system
Open your header ports 1mm larger than your exhaust ports.
Open your intake ports 1mm larger than your IM ports

 

bigger cams, the skunk 1's are weak. i have seen them make big power on some aplications but i think stage 2's of some sort would gain more peek ***** power and thats what your going for.

 

Different cams.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2.2L &raquo;</TD></TR><TR><TD CLASS="quote">Different cams.</TD></TR></TABLE>

 

stock injectors are 240cc BTW. Unless you consider 290cc prelude injectors stock.

 

different cams? what could be run thats more aggressive, while maintainng the stock valvetrain as he stated in the first post?

 

There has to be some other aftermarket cams that are more aggresive that can handle the stock itr valvetrain besides the sk2 stg1.

 

I would say new cams, injectors, and a header with a true merge collector, that street collector is holding up power. about the cams, do you research because you are trying to retain your stock valvetrain. I hope to see you hit 200whp, that is an accomplishment without swapping to forged internals. ****, I am shooting for 200 whp, and I have a motor full of aftermarket parts and forged internals.

 

I'd recommend a toda header or if u can wait for it the SMSP.
My JDM ITR dynoed 186whp and 132tq with just I/H/E. Not much gain you've had from those stage 1s..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StyleTEG &raquo;</TD></TR><TR><TD CLASS="quote">switch to an electric water pump
install a crank scrapper
improve your PCV system
Open your header ports 1mm larger than your exhaust ports.
Open your intake ports 1mm larger than your IM ports

</TD></TR></TABLE>

Excellent ideas. I am slightly concerned with using an electric water pump because I have a mini battery and my alternator is underdriven. I just started hearing about this crank scraper idea. I wonder if it makes power.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DefiantGSR &raquo;</TD></TR><TR><TD CLASS="quote">stock injectors are 240cc BTW. Unless you consider 290cc prelude injectors stock.</TD></TR></TABLE>

According to sgt (who tuned my engine), the JDM ITR injectors are 290cc.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by evilxkid &raquo;</TD></TR><TR><TD CLASS="quote">bigger cams, the skunk 1's are weak. i have seen them make big power on some aplications but i think stage 2's of some sort would gain more peek ***** power and thats what your going for.</TD></TR></TABLE>

Stage 2 require aftermarket valvetrain.