Alright, just got the setup off the dyno the other day. Here is a list of whats done for those who want to know..

B18C1 block
ITR rods and pistons
New bearings, rings, etc
GSR head, milled .010
Blox B cams
Omni valve springs and retainers
Throats blended on head, kinda like the ITR style work
Skunk2 manifold
ITR throttle body (62mm)
ITR AEM CAI
JDM DC 4-1. Tubes a little dented from previous owner bottoming out
custom 2.5" exhaust with stock cat with modded 2.5" collector.

Tranny is a stock 99 Si. Flywheel is stock GSR, clutch is ebay special. I did most of the tuning on the street, then went to the dyno. Used Crome pro. Here is what we started with and what I left with. We weren't able to use the wideband on the dyno because for some reason my car was producing some kind of interference that caused the wideband to die.... anyways, here is the graph..




Top end power just simply would not come up like it should be. We unbolted the exhaust/cat and made one final pull. No additional tuning, nothing else. Same setup, no exhaust.



In the end I wasn't too disappointed with the results. I would have liked to have seen 180+ but I don't think its that bad. Most of the gains shown came from changing the vtec point and adjusting the cam gears. Looks like I will need to find a better flowing cat and possibly change the exhaust.

 

Hmmm... No wideband, that's suck! What is your final cam gears setting? Might have a few hidden hp with the correct a/f ratio... nice power 3rd or 4th gear pull?

 

Yeah, the whole wideband thing kind of sucked. We tried everything we could think of. We eventually put the owners truck on the dyno and had no problems with the wideband then. Its kind of strange that my car did this. I was on the same dyno a week before with 0 problems. Changed only the fuel pump and then I get these issues. Even used a stock pump. Oh well..

Pulls were in 3rd gear and all graphs are in SAE correction factor.

 

Pro series manifold, or first gen?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">Pro series manifold, or first gen?</TD></TR></TABLE>

Pro series. Why do you ask?

 

she really responded when you let her breath,even with no additional tuning. makes me think theres more in her than what we see

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hybrid96EK &raquo;</TD></TR><TR><TD CLASS="quote">

Pro series. Why do you ask?</TD></TR></TABLE>

The first gen manifolds are terrible for GSR heads. I have not used a new "pro" series manifold so i cannot say if they are any better. Did you degree the cams? If not, where did the gears end up at?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">

The first gen manifolds are terrible for GSR heads. I have not used a new "pro" series manifold so i cannot say if they are any better. Did you degree the cams? If not, where did the gears end up at?</TD></TR></TABLE>

I did not degree the cams. I honestly don't know how to do such. Can it be done with the engine in the car still? Whats needed? Significant benefits from doing it?

Gears ended up at +1 on the exhaust and +2 on the intake. The cams did NOT like being retarded one bit.

I think a good high flow cat or test pipe will really help the top end quite a bit. I'm also considering a lightweight flywheel and a JDM ITR 4.75 final next.

 

Did you experiment with them alot though?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">Did you experiment with them alot though?</TD></TR></TABLE>

I tried advancing and retarding each individual cam. Is this what you mean? I honestly didn't feel too comfortable going beyond +2 since the head is milled slightly.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hybrid96EK &raquo;</TD></TR><TR><TD CLASS="quote">

I tried advancing and retarding each individual cam. Is this what you mean? I honestly didn't feel too comfortable going beyond +2 since the head is milled slightly.</TD></TR></TABLE>

that was the smart thing to do. it may not be at its potential but it wont blow. you need to get the head off check your clearances and get them dialed in. i think its hiding alot

 

When you drop the exh and you gain that much power, the engine is trying to tell you something. Are you listening?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">When you drop the exh and you gain that much power, the engine is trying to tell you something. Are you listening?</TD></TR></TABLE>

I'm pretty sure I can hear what its telling me...

 

What's is the final vtec set point?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Agnom &raquo;</TD></TR><TR><TD CLASS="quote">What's is the final vtec set point?</TD></TR></TABLE>

6,100

 

damn! nice numbers bro
i'm hoping to throw down similar numbers with a similar setup.

 

Time for some 3" exhaust.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C1NMotion &raquo;</TD></TR><TR><TD CLASS="quote">damn! nice numbers bro
i'm hoping to throw down similar numbers with a similar setup.</TD></TR></TABLE>

I'd be pretty happy if I saw the 187 results with the exhaust hooked up. Its certainly not that bad at 175, but the additional power and top end would have been nice to see. Still, there are restrictions that can be improved on to make more power in the end.

 

Nice bro. I have the same setup as your bro
1.85 itr pistons with rods
blox spec b cams
blox valvetrain
skunk manifold/cam gears
310cc
stock b16 tb
5zigen catback exhaust and I made 189whp, I was pretty happy I should be close to 200whp open header

 

Aside from having the cams degreed, opening up the exhaust to something bigger as others and yourself are saying clearly seems to be the solution. Let us know if you end up getting some upgrades. Numbers are still pretty good. It won't be too hard to pull out some more.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gsrob &raquo;</TD></TR><TR><TD CLASS="quote">Aside from having the cams degreed, opening up the exhaust to something bigger as others and yourself are saying clearly seems to be the solution. Let us know if you end up getting some upgrades. Numbers are still pretty good. It won't be too hard to pull out some more. </TD></TR></TABLE>

Yeah. My exhaust is actually complete ***. Its crush bent 2.5" with a cherry bomb for a resonator and a $20 "turbo" style muffler from Kragen. Certainly not the best flowing items out there. The cherry bomb is like 36" long as well That combined with a stock cat just can't be good for the top end, as the dyno has confirmed. I just don't know what kind of exhaust I can get that won't sound like ***. I HATE raspy and tiny exhaust.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hybrid96EK &raquo;</TD></TR><TR><TD CLASS="quote">

Yeah. My exhaust is actually complete ***. Its crush bent 2.5" with a cherry bomb for a resonator and a $20 "turbo" style muffler from Kragen. Certainly not the best flowing items out there. The cherry bomb is like 36" long as well That combined with a stock cat just can't be good for the top end, as the dyno has confirmed. I just don't know what kind of exhaust I can get that won't sound like ***. I HATE raspy and tiny exhaust.</TD></TR></TABLE>

How does your exhaust system sound like? Loud, medium, little louder than stock? Because I doing something similar to yours this week. And what else could I do to quite the noise down more? beside reduce it down to 2.25" maybe? Let me know.

 

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

How does your exhaust system sound like? Loud, medium, little louder than stock? Because I doing something similar to yours this week. And what else could I do to quite the noise down more? beside reduce it down to 2.25" maybe? Let me know.</TD></TR></TABLE>

Its pretty quiet for a 2.5" system. Not too bad. Although when its cold it tends to have a hollow sound to it. Its not the best but I didn't spend much on it so I can't bitch too much. I certainly do NOT want to go with smaller pipe.

 

I would give this an OK. I have bit of a similar set-up, ITR Rods and ITR Pistons but am running GSR cams with a Pnd GSR intake manifold. You made 1whp more and are down 13tq to my car. Also my exhaust is even more restrictive DC 4-1 non-JDM, 2-1/4 high flow cat to a Comptech Exhaust. I think there is way more potential in your engine. Get the exhaust fixed up and can you post the A/F ratio?

 

what dyno was this on?