Refresh of the mind....last time...car kept misfiring around 18psi. Setup was stock honda distributor with HVC coil. B18c, Stock bore, 60-1 T4, 58 hot, 70 cold, Hondata

Switched to a Blaster SS coil and same distributor and went to 110 race gas. Best clean dyno graph..



This was around 23ish psi.

Next time around....24ish psi..


We switched to a digital 6 box and the HVC coil...same thing. Will not hold any more boost over 24psi...without shooting flames. Plug gap is around 24.

Thanks for the all your help guys!!!!

 

So when are you taking it to the track Jason?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostaholic &raquo;</TD></TR><TR><TD CLASS="quote">So when are you taking it to the track Jason?</TD></TR></TABLE>

I need to figure this spark issue out first. I may not have any money left over from all my dyno days...lol

 

how much timing were you running on the top end?

 

I say play with your plug wires, get the magnacors meybe you getting interference. also try resisant plugs. Play with gapping go smaller.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by saso &raquo;</TD></TR><TR><TD CLASS="quote">I say play with your plug wires, get the magnacors meybe you getting interference. also try resisant plugs. Play with gapping go smaller.</TD></TR></TABLE>

Brand new NGK plug wires. That gap is already really low.

 

call me crazy but have u considered going back to a stock ignition set up?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostaholic &raquo;</TD></TR><TR><TD CLASS="quote">how much timing were you running on the top end?</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DIRep972 &raquo;</TD></TR><TR><TD CLASS="quote">call me crazy but have u considered going back to a stock ignition set up?</TD></TR></TABLE>

hahah....not crazy at all. That is my last option. I am going to try and get a brand new one from honda on the loan program. I am also going to try and go to a coler plug as well.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostaholic &raquo;</TD></TR><TR><TD CLASS="quote">how much timing were you running on the top end?</TD></TR></TABLE>

I will have to talk to Vaportrail...John on the exact numbers, but everything looked great in the timing area. I can get you the numbers though here shortly.

 

What plugs are you running?

 

Very nice

I knew it would put out mid to high 400's

 

we had to lower our gap to about 22 when we got over 450?????

 

very nice J. 500hp is just around the corner

 

man how did they get around this on duc's car? thats gottta be hard to get to work right.

 

In my uneducated eye, that looks more like a top end lean misfire. See how your 24ish psi graph starts getting jagged right as the mixture goes leaner compared to the 23ish psi graph.

Just a thought.

 

try the zex plugs.it worked for me.they don't cost that much so if it doesn't work,you won't be out much.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ttzofutah &raquo;</TD></TR><TR><TD CLASS="quote">we had to lower our gap to about 22 when we got over 450?????</TD></TR></TABLE>

That is also in my next attempts, but man that is so small.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">very nice J. 500hp is just around the corner </TD></TR></TABLE>

Yeah...that is the goal. Thanks alot John!

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">man how did they get around this on duc's car? thats gottta be hard to get to work right</TD></TR></TABLE>
Yeah, I am going to IM him and see what his setup is.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">In my uneducated eye, that looks more like a top end lean misfire. See how your 24ish psi graph starts getting jagged right as the mixture goes leaner compared to the 23ish psi graph. </TD></TR></TABLE>

The pass before was around high 12s-13:1 and it misfired. So we richened it up and still got the misfire. Thanks for the eye. I am at this point looking for a solution as I keep buying bandaids and they are starting to add up $$

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">try the zex plugs.it worked for me.they don't cost that much so if it doesn't work,you won't be out much</TD></TR></TABLE>

Do you have a part number? At this point I am game for anything.

 

I dont recall actual timing values, but they are, as always in spec, on the conservative side. 12.8:1 a/f is right in spec for the octane gas we are running (110). C16 you can go a bit leaner, with more timing.

 

i have had nothing but problems with zex plugs. I will never use anything but ngk again, after i had a zex plug literally fall apart inside the combustion chamber

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FFgeoff &raquo;</TD></TR><TR><TD CLASS="quote">i have had nothing but problems with zex plugs. I will never use anything but ngk again, after i had a zex plug literally fall apart inside the combustion chamber</TD></TR></TABLE>

I remember daryl told me when that happend. Since that day, i will not use/recoomend zex plugs.. I always use NGK's.. usually BKr7E11

 

I had ZEX plugs too , they burn stupid, i didnt like them at all nor trusted thme after really looking at the way they burned

 

 

22 gap onthe plugs is not too small, remember you are ytrying to fing a problem. I went lower than that bf

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DSF &raquo;</TD></TR><TR><TD CLASS="quote">In my uneducated eye, that looks more like a top end lean misfire. See how your 24ish psi graph starts getting jagged right as the mixture goes leaner compared to the 23ish psi graph.

Just a thought.</TD></TR></TABLE>


During a misfire, a A/F meter will usually read lean, no matter what the actual conditions are, due to excessive air content in the exhaust.

There is no reason you should have to go to 0.022" on spark plug gap, the DSM guys use 0.028" with a stock ignition system on cars making 500 whp. That is, unless your ignition system really sucks.

Use NGK BPR-7ES plugs, and gap them to like .026" or so.