Okay i really need help on this issue because i've heard it both ways. I just installed the DC Race header on my 2006 Si and i need to know if this is gonna cause any problems with the engine running lean. Dealer says yes, a couple people in another forum say no.

I don't know WTF is goin on so please somebody give me a straight shot answer and if there's anyway i can solve this issue please let me know.

I'm getting a non-fouler put in to remove the CEL but from the looks of it apparently that won't work either with the lean running issue.

What should i do?

 

Well if you have the exhaust system to back it up and if the header really flows that good, then yes you could run lean.More airflow needs more fuel to back it up.

 

So how do i get more fuel to it?

 

get a fuel pressure regulator and should be good

 

Easier said than done. Do they make one for the '06 Si?

 

The 06 si has a factory MAF sensor. This will help compensate for bolt ons. You cannot get a fuel regulator or anything for this car. Some of you guys need to learn a thing or two before you recommend how to set it up.

Who knows, maybe even dc would know if you called them up or e-mailed. I bet they have done a little bit of r&d on their own parts.

 

k-pro

 

No k-pro available unfortunately. They have a reflash to eliminate factory rev hang and lower vtec a bit. This is great for people just doing bolt ons and such.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RedEj8 &raquo;</TD></TR><TR><TD CLASS="quote">k-pro</TD></TR></TABLE>

2006 Civic SI K-Pro features

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">
The K20Z3-06Si reflash lowers the VTEC point to 4500 rpm, advances the cam angle and raises the rev limit to 8600 rpm.

We have implemented a VTEC window from 4500rpm to 5800 rpm.

• Below 4500 rpm the K20Z3 is always on the low cam
• Above 5800 rpm the K20Z3 is always on the high cam
• Between 4500 rpm and 5800 rpm the K20Z3 is on the low cam at part throttle switching to the high cam at full throttle.


This one reflash will work well with a variety of aftermarket performance parts. It will work well with:
• An intake
• Cat-backs (as long as they are less restrictive than stock)
• A race header *
• A combination of intake and race header

(*Note that current race headers eliminate the catalytic converter and will generate a check engine light. This engine check light is for emissions and will not affect the car's performance. Race headers are for offroad use only)

You must have a minimum of an intake or header.

It is not designed to work with a stock 06/07 Civic Si and will lose power between 4500rpm and 5600 rpm if installed.

The 06 Civic employs a mass air flow sensor that automatically adjusts the air-fuel ratio for increases in air flow from intakes and race headers. Race headers will not cause this engine to run lean.

The VTEC switch point on this reflash is very smooth - much smoother than previous reflashes. With a stock air box and race header the switch point is virtually undetectable. For the reduction in VTEC "kick" and aural stimulation, we apologize, but this is the path to maximum power.

Power is gained in the midrange from 4700rpm to 6300 rpm. Power gains above 6500 rpm are negligible, although the higher rev limit will raise average power a little.

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

 

K-Pro and Reflash are two very different things. There is no K-pro out for the Si yet although it would be very nice to have one.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Runnerdown &raquo;</TD></TR><TR><TD CLASS="quote">The 06 si has a factory MAF sensor. This will help compensate for bolt ons.
Who knows, maybe even dc would know if you called them up or e-mailed. I bet they have done a little bit of r&d on their own parts. </TD></TR></TABLE>

DC has already pissed me off quite a bit. When i called them about the issue with the header possibly making the car run lean all they could say was that "it shouldn't" which basically means they don't freakin know. Then i hear on here that YES IT DOES. Dealership says YES IT DOES run lean w/ the race header.

And now i hear on here that the MAF should compensate. Which i certainly hope it will do. I just put a non-fouler on the secondary O2 sensor to eliminate the CEL. Reser the ECU and all.

I also called Hondata and they say that their reflash is NOT recommended with the DCRH even though it clearly states on their websites that either an intake or header minimum is required for the reflash to produce gains.

It's kinda upsetting cause i feel like im going in one giant loop trying to get everything sorted out.