Spark blowout at 14psi

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ICEMAN.KCMO
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Spark blowout at 14psi

Post by ICEMAN.KCMO »

Here is my setup.

190k mile block
GT2876R
Midmount intercooler
Tomei 850cc injectors
Rom tune by me
Z32 MAF
NGK iridium plugs gapped at .040

Main Mod to do with this setup
XS engineering powerpak. (Coil voltage to 20v)


UPDATE: Changed spark plugs, Fixed most of the problems. Now i get a few spots of missing. around 4200 and 5200. What is weird, it mostly does it when it is cold. Once it warms up, It quits completely..



Having what feels like Spark blowout at 14psi. Had them gapped at .45 and was getting blowout at 12psi. Feels like blowout when i get past 4500 rpm. Going to try a grounding kit first and update. Anybody have any other ideas?
also, here is my timing map
Image

67 is 8ps i 71 is 10psi 74 is 12psi and 76 is 14 psi
Last edited by ICEMAN.KCMO on Tue Jul 30, 2013 6:42 pm, edited 3 times in total.
Steve.
Marcus
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Re: Spark blowout at 14psi

Post by Marcus »

Oh noes kansas brotha. Relay mod to the coil power supply can really help some of this. Have you done it?
ICEMAN.KCMO
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Re: Spark blowout at 14psi

Post by ICEMAN.KCMO »

The coil is already getting 20 volts from the XS engineering powerpak.
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Re: Spark blowout at 14psi

Post by arob987 »

Try gapping them down to like .30 it may even need to be smaller start at .30 then .25 then .22 then .20 til no blowout if it doesn't go away by I'd say .18 on 14 psi its really weak coil/dizzy don't be scared of the smaller gaps no one will think less of you haha . Also the extra voltage can wear things faster so it may be getting weaker.
New turbo setup build in progress-11mm headstuds/cometic head gasket/jwt cam gears added,prec. 6266,gato mani,prec.46mm wg,bigger fmic,mspnp2,z32 trans,spec twin,q45 rear,full energy bushings. Still need injectors,and a few other small things

Old setup-ka24de-wiseco 9:1 pistons,eagle rods,arp studs,jwt s1 cams,brian crower springs and retainers,jgs log mani,t3 57trim .63 a/r,tomei 740cc,38mm turbonetics evolution wastegate,synapse bov,ebay fmic,nistune,j30 lsd.5 speed swap,z32 brakes F&R.
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Re: Spark blowout at 14psi

Post by Marcus »

ICEMAN.KCMO wrote:The coil is already getting 20 volts from the XS engineering powerpak.
Perhaps. Where does this powerpak get it's voltage from? Do you know the amperage?
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Re: Spark blowout at 14psi

Post by ICEMAN.KCMO »

gets power from the factory 12v source.. think i still need to do the relay mod?
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Re: Spark blowout at 14psi

Post by Marcus »

ICEMAN.KCMO wrote:gets power from the factory 12v source.. think i still need to do the relay mod?
I don't know what I think. When it comes to voltage and amperage. 1.) I wouldn't be upset about 30's for gap. 2.) I wouldn't know how to feel about a capacitor supplying another capacitor.

I would hunt for the closest option for COP or settle with less gap.
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Re: Spark blowout at 14psi

Post by Marcus »

ICEMAN.KCMO wrote:gets power from the factory 12v source.. think i still need to do the relay mod?
At the same time....We should look into this. You have 20 volts at your coil. What is the max your alt. puts out? What's in the guts of said XS piece? How is this piece setup? Lots of questions for sure.
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Re: Spark blowout at 14psi

Post by arob987 »

If that box works like its suppose to then the relay mod will do you no good,its suppose to supply 20v no mater what your stock wire voltage is via capacitor.stock coils aren't made for that much voltage yes the 20v will make hotter spark but after time it kills the coil since its not made for 20v. If and alternators voltage regulator Messrs up and the alternator overpowers everything at 16+ volts you take a risk of it frying anything cause its only made for 15ish volts max yes there's a safety margin but 20 v will kill anything after a length of time it just gets weaker and weaker.I'm not saying yours is weak I think you should lower the gap your trying to run stock gap on stock coil with more power the coil just cant put out that much juice.you should be in the lower .30 somewhere on your gap at minimum I'd start at .35 lower it by like .02 til no blow out if that doesn't work and you rediculously low then you have a problem and should be woried but at the moment your bound to have blowout at .40
New turbo setup build in progress-11mm headstuds/cometic head gasket/jwt cam gears added,prec. 6266,gato mani,prec.46mm wg,bigger fmic,mspnp2,z32 trans,spec twin,q45 rear,full energy bushings. Still need injectors,and a few other small things

Old setup-ka24de-wiseco 9:1 pistons,eagle rods,arp studs,jwt s1 cams,brian crower springs and retainers,jgs log mani,t3 57trim .63 a/r,tomei 740cc,38mm turbonetics evolution wastegate,synapse bov,ebay fmic,nistune,j30 lsd.5 speed swap,z32 brakes F&R.
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Re: Spark blowout at 14psi

Post by neverlift »

something is giving out on you man, I ran .04 for a long time, blaster ss coil and relay mod. From 8-18psi and a couple spikes over 20psi.

I am also curious about the xs box..is it like the aeromotive pump booster where it increases voltage or is it constantly at 20volts?
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Re: Spark blowout at 14psi

Post by ICEMAN.KCMO »

neverlift wrote:something is giving out on you man, I ran .04 for a long time, blaster ss coil and relay mod. From 8-18psi and a couple spikes over 20psi.

I am also curious about the xs box..is it like the aeromotive pump booster where it increases voltage or is it constantly at 20volts?
it runs consistently at 20 volts. also, what turbo were you running?
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Re: Spark blowout at 14psi

Post by sdaigle240 »

I would have said its fairly well agreed apon on here that these gaps per boost (roughly) are effective. these are my actual numbers through the years that have been discussed elsewhere

.032 - 8-12psi

.028 - 12-15psi

.026 - 16psi

.024 - 18-20psi i may actually be fine on .026ish here, never tested it.


thorough responce that i totally agree with....
arob987 wrote:Try gapping them down to like .30 it may even need to be smaller start at .30 then .25 then .22 then .20 til no blowout if it doesn't go away by I'd say .18 on 14 psi its really weak coil/dizzy don't be scared of the smaller gaps no one will think less of you haha . Also the extra voltage can wear things faster so it may be getting weaker.
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Re: Spark blowout at 14psi

Post by neverlift »

yeah grantspec a local ka-r guy was having tremendous issues with spark blow out at 3psi IIRC
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Re: Spark blowout at 14psi

Post by ICEMAN.KCMO »

update, See first post.
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Re: Spark blowout at 14psi

Post by sdaigle240 »

well....what did you gap them at? and get copper plugs.
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Re: Spark blowout at 14psi

Post by schmauster920 »

Edit : thought it was a fuel map
Last edited by schmauster920 on Fri Aug 02, 2013 12:52 pm, edited 1 time in total.
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Re: Spark blowout at 14psi

Post by jmac636 »

I don't think your coil will last very long with a constant 20v. I went through a few coils on my S14 using a boost a spark over a period of 2 years. I never was able to run any where near .40 gap but I also never ran less than 15lbs of boost on a holset he341. Sdaigle's chart of gap vs boost is what I experienced even with the relay mod suppling direct battery voltage and a boost a spark both at the same time. I always had to replace my cap and rotor when it started to blow out spark and that was after I want to say 3 to 4000 miles. Don't remember exactly. So thats what I recommend at this point. Next ka-t for myself personally I will either run an SR ecu with cop or a megasquirt setup. Spark blowout is a major issue with the Ka. Always a battle. Good luck.
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