Ignition setups (ive got spark blowout)

[cadet18]

Just wondering what you guys are using for ignition setups. ive got ngk platinums (new) set at .025" on e85 with factory coilpacks... i am having issues with spark blowout on anything above wastegate pressure since converting to e85. i know for a fact its spark blow out from tuning it on low boost bringing down the gap fixed the first bucking, popping issue under boost. maybe i need different plugs maybe my coilpacks arent strong enough. anyone know of the best plugs in their opinion and hopefully an ignition upgrade where i can retain my factory wiring (i am using nistune). Thanks in advance for the help. i finally sorted my startup issues as well it was my startup tables.

[float_6969]

I have a standalone EMS, so I'm not a fair comparison. Some things you can do with the stock coil packs to increase their performance is to ensure that you're getting fully battery voltage to the coils on the primary coil. IMHO, the wiring for the coils in the factory harness is on the small side. You can also use a voltage booster to increase the spark strength of stock coils. You can also use a CDI to increase spark strength as well as aftermarket coils.

[TheMAN]

what exact plug are you running? what ignition timing are you running?

[float_6969]

NGK Iridiums, 7 heat range (I don't remember the PN off the top of my head). My standalone is using GM wasted spark coils. Timing is on the high side as I'm running E85. I run about 20° at idle and up to about 35°up top. The timing isn't linear though, and I have the timing retarded based on boost as well.

[cadet18]

running ngk v powers now gapped at .020" or .5mm

[TheMAN]

I don't need to know what your timing map is on your ECU... I need to know what your base timing is set to, which is something you do with your CAS... you have to start from the bottom up.... you're saying you're having start up issues, so base timing is very important here

your plug is gapped too close also... a gap that close greatly reduces spark voltage... increase it to 0.7-0.8mm... which KIND of NGK V power are you running? you know, the plug number? It's hard to help without specifics

[cadet18]

my cas is at 10 btdc checked with a timing light. my startup issues are gone. and if i go any bigger on my spark gap then i get spark blowout in boost and the car bucks badly when trying to accelerate. not sure of the part number i threw away the box already there whatever you get from advance auto parts when you look it up for a 1988 nissan pulsar nx se 1.8L. NGK V Power is all i know. ive ran these in the past with 93 octane and had no issues. the E85 and all the extra fuel is what im guessing is causing the spark blowout.

[boost_boy]

First of all, what type EMS are you running? maybe I missed something in the past, but I see no mentioning of an aftermarket ecu or some type add-on tuning device. The type of plug you should be using is an NGK BCPR6ES-11. Anything else is just a waste of money. Iridiums and platinums on a stock ignition system is not necessary. Is your alternator's output sufficient enough? Is your engine grounded correctly? Just some of the things that will cause you some issues. And if you are using something aftermarketish, are you sure your fuel tables are optimum for the type of boost you are running?

[cadet18]

i am using ngk 6 heat range plugs as well as tuning with nistune. fuel tables are set up and i have MAF translation tuned for low boost part throttle. i just put my second tank of e85 in so i will tune the high end since i have run a whole tank through to alleviate the majority of 93 oct. my alternator puts out 13.8-14 volts while cruising... havent checked amperage( i dont have anything to check it with). i have added 8 gauge wiring from the head and the intake for extra grounds for the engine so i assume my grounding is good. my maf translation def needs to be tweaked more for high boost but its not running pig rich under wot high boost. just in the low 10's. this def needs to be addressed just havent had the time to get to get to it yet.

[float_6969]

low 10's IS pig rich. Rich situations can cause ignition issues, especially on E85. Remember that a 10:1 afr reading on the wideband is more like 6:1 on E85. That much fuel in the combustion chamber really stresses the ignition system. Also keep in mind that the flamability limits for E85 are different than gasoline. I'm not 100% sure, but I think you're near the flamability limit of E85 when the wideband reads 10:1.

Get that thing leaned out to 12:1 everwhere and see if you're still having issues.

[cadet18]

thanks ill try that when i get home again next month. hoping to have it all ironed out within 2 weeks of getting home