spark blowing out over 10psi and very rich WOT (10:1) - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

1988montecarloss · 09-07-2016, 08:47 PM

car is an s13 with s13 sr20, s14 bb turbo, 550cc injectors, fmic, 3" downpipe and exhaust with an enthalpy tuned ecu, pretty standard setup.

recently installed a hallman mbc and anything over 10psi it blows the spark out, even with the plugs gapped all the way down to .018 and with either bkr6e and bkr7e plugs (acts the same with both) also goes to 10:1 at wide open throttle, all coils seem to be firing fine and coil harness is in good shape with a good ground to the firewall

any ideas what it could be? i was thinking the ignition timing is retarded too far possibly due to a bad knock sensor but havent had a chance to get a timing light on it yet

Mcflurry · 09-07-2016, 09:33 PM

Quote:

Originally Posted by 1988montecarloss

car is an s13 with s13 sr20, s14 bb turbo, 550cc injectors, fmic, 3" downpipe and exhaust with an enthalpy tuned ecu, pretty standard setup.

recently installed a hallman mbc and anything over 10psi it blows the spark out, even with the plugs gapped all the way down to .018 and with either bkr6e and bkr7e plugs (acts the same with both) also goes to 10:1 at wide open throttle, all coils seem to be firing fine and coil harness is in good shape with a good ground to the firewall

any ideas what it could be? i was thinking the ignition timing is retarded too far possibly due to a bad knock sensor but havent had a chance to get a timing light on it yet

Interesting, you'll have to get a timing light on it otherwise anyone would be guessing. MAP or MAF? If so what?

KAT-PWR · 09-07-2016, 11:41 PM

Boost.leak.test.

1988montecarloss · 09-08-2016, 02:18 AM

Quote:

Originally Posted by Mcflurry

Interesting, you'll have to get a timing light on it otherwise anyone would be guessing. MAP or MAF? If so what?

MAF car, Z32 maf

1988montecarloss · 09-08-2016, 02:18 AM

Quote:

Originally Posted by KAT-PWR

Boost.leak.test.

will try that too, thanks

cotbu · 09-08-2016, 05:32 AM

I believe it's using the knock map as well.
Check ecu for codes, then verify timing. Test to see, if it's fixed. Spark plug gap .028 all day long.

ultimateirving · 09-08-2016, 03:17 PM

Don't forget the coil packs in these vehicles can be an issue too. I've had coil packs that fire fine under light load. But start breaking up really bad under boost

Kingtal0n · 09-12-2016, 07:21 AM

If its 10:1 you need to lean it out to 11:1 or 12:1 or so (boost leak test, followed by tuning)

I keep my gap around 0.035" no sense in going down to 28 thousandths if you are only running a 250rwhp setup

jedi03 · 09-12-2016, 09:12 AM

check with martin...he retuned mine cuz I was at the opposite...lean during boost...just retune and is awesome!

1988montecarloss · 09-12-2016, 11:06 PM

Quote:

Originally Posted by cotbu

I believe it's using the knock map as well.
Check ecu for codes, then verify timing. Test to see, if it's fixed. Spark plug gap .028 all day long.

Quote:

Originally Posted by ultimateirving

Don't forget the coil packs in these vehicles can be an issue too. I've had coil packs that fire fine under light load. But start breaking up really bad under boost

Quote:

Originally Posted by Kingtal0n

If its 10:1 you need to lean it out to 11:1 or 12:1 or so (boost leak test, followed by tuning)

I keep my gap around 0.035" no sense in going down to 28 thousandths if you are only running a 250rwhp setup

Quote:

Originally Posted by jedi03

check with martin...he retuned mine cuz I was at the opposite...lean during boost...just retune and is awesome!

thanks guys, if it ends up not being a boost leak or timing issue i will give martin a call

09-07-2016, 08:47 PM	#1
1988montecarloss Nissanaholic! Join Date: Jun 2012 Location: old el paso Age: 28 Posts: 1,979 Trader Rating: (24) Feedback Score: 24 reviews	spark blowing out over 10psi and very rich WOT (10:1) car is an s13 with s13 sr20, s14 bb turbo, 550cc injectors, fmic, 3" downpipe and exhaust with an enthalpy tuned ecu, pretty standard setup. recently installed a hallman mbc and anything over 10psi it blows the spark out, even with the plugs gapped all the way down to .018 and with either bkr6e and bkr7e plugs (acts the same with both) also goes to 10:1 at wide open throttle, all coils seem to be firing fine and coil harness is in good shape with a good ground to the firewall any ideas what it could be? i was thinking the ignition timing is retarded too far possibly due to a bad knock sensor but havent had a chance to get a timing light on it yet __________________ IG: @Haley72692

09-07-2016, 11:41 PM	#3
KAT-PWR Nissanaholic! Join Date: Dec 2011 Location: US Posts: 2,040 Trader Rating: (11) Rides Gallery: KAT-PWR Feedback Score: 11 reviews	Boost.leak.test. __________________ MRP Manufacturing

09-08-2016, 05:32 AM	#6
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 47 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	I believe it's using the knock map as well. Check ecu for codes, then verify timing. Test to see, if it's fixed. Spark plug gap .028 all day long. __________________ LoverTechnologies "Half Broken Things!"

09-08-2016, 03:17 PM	#7
ultimateirving Zilvia FREAK! Join Date: Nov 2010 Location: arizona Age: 33 Posts: 1,519 Trader Rating: (1) Feedback Score: 1 reviews	Don't forget the coil packs in these vehicles can be an issue too. I've had coil packs that fire fine under light load. But start breaking up really bad under boost __________________ Z32 with lq4 swap Desert Street Scene \|\| Dssevents.com

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09-12-2016, 07:21 AM	#8
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 38 Posts: 4,649 Trader Rating: (17) Feedback Score: 17 reviews	If its 10:1 you need to lean it out to 11:1 or 12:1 or so (boost leak test, followed by tuning) I keep my gap around 0.035" no sense in going down to 28 thousandths if you are only running a 250rwhp setup

09-12-2016, 09:12 AM	#9
jedi03 Nissanaholic! Join Date: Jul 2008 Location: albuquerque Posts: 1,784 Trader Rating: (8) Feedback Score: 8 reviews	check with martin...he retuned mine cuz I was at the opposite...lean during boost...just retune and is awesome!