any ideas of what the problem might be?

I've got a 99 civic with a built d16z6 motor running turbo. tuned with neptune for 15 psi. just to give you background, a couple months ago i had this similar problem. when i accelerate, the car would hit mid rpm range and then just bog down really bad. someone told me that i might have fouled spark plugs and when i changed the plugs the problem was gone and my car ran fine and strong. the brand of plugs i used were denso.

then just last night i went to the track and put in some new plugs but this time i used ngk plugs because no automotive store around here sold denso. on my second run down the track i had the same problem occur...mid rpm...bog down. but this time when i replaced the plugs with a new set, the problem is still there.

is this because i use a different brand of plugs and i should stick with denso? or what else could the problem be? thanks for any help

 

i highly doubt that its your plugs my friend was having the same problem when he hit about 5krpm he would bog down too but his set up was a b16a turbo and found out it was his distributer

 

bump for more help

 

help pleeeaaaaasse

 

nobody has any idea??

 

Your car has VTEC right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM_CivicEG6 &raquo;</TD></TR><TR><TD CLASS="quote">Your car has VTEC right?</TD></TR></TABLE>

yes it does but i'm not sure if it's hooked up or even working.

 

If it was a bad plug the problem would occur through all rpm ranges.

What fuel sys. are you running?: injectors, FMU, regulator.

It could be bad A/F mixtures at that RPM. Try lowering the boost and see if it still happens.

 

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

yes it does but i'm not sure if it's hooked up or even working.</TD></TR></TABLE>

AND HOW THE expletive CAN YOU HAVE A FULLY BUILT HONDA, AND NOT KOW IF VTEC IS WORKING?!?!

Idiot

 

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

AND HOW THE expletive CAN YOU HAVE A FULLY BUILT HONDA, AND NOT KOW IF VTEC IS WORKING?!?!

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

well, for the smart guy...before this car, i've never driven a car w/VTEC before. before the swap, it was just a stock dx. second, can you REALLY tell w/SOHC vtec when it kicks in??? i don't know, maybe. when I built and swapped the motor I put on the turbo at the same time. and after that, seems like the turbo spools up around the same time vtec is supposed to kick in.

turbo pulls harder than VTEC

 

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

What fuel sys. are you running?: injectors, FMU, regulator. </TD></TR></TABLE>

RC 550cc injectors, walbro fuel pump, and neptuned.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boo bees &raquo;</TD></TR><TR><TD CLASS="quote">If it was a bad plug the problem would occur through all rpm ranges.

It could be bad A/F mixtures at that RPM. Try lowering the boost and see if it still happens.</TD></TR></TABLE>

Why did the problem go away after I changed the plugs before? if the problem is NOT the plugs, then even after changing the plugs, my car should still bog down, right?