On my LD9, I did the 2.2 coil conversion and still believe I'm getting a little spark blow out. Wires are Accel thundersport 300+s. Currently stock 2.2 coils. NGK idadium plugs gaped at .025. Anyways, for a stronger coil to hopefully get a stronger spark (I know there's a debate here), what coils would be better between these two:
Maxx Performance 9917 (Made by/same as Accell Super coils I believe)
Primary Resistance: 0.5 Ohms
Secondary Resistance: 8.0 k Ohms
Turns Ratio: 75:1
Maximum Voltage: 45,000 Volts
Summit Racing High output coils 850017
Primary Resistance: 0.38 Ohms
Secondary Resistance: 8.85 k Ohms
Inductance: 4.5 mH-5.6 mH
Maximum Voltage: 40,000 Volts
The Maxx performance/Accel ones have a higher maximum voltage, but the Summit ones have lower resistances.
12.6 @ 114.6 MPH
EDIT:
Summit coils should have read a Secondary Resistance of 5.85 k ohms
12.6 @ 114.6 MPH
You shouldnt be getting blowout at such low boost. Are the plugs fouled or wrong? Or is the tune crap?
1994 Saturn SL2 Home Coming Edition: backup car
2002 Chevy Cavalier LS Sport Coupe: In a Junk Yard
1995 Mazda Miata R-package Class=STR
Sponsored by:
Kronos Performance
WPI Class of '12 Mechanical Engineering
WPI SAE Risk and Sustainability Management Officer
Do you have anyway to monitor the spark discharge in the ignition?
No, 8psi was on my last setup. I'm currently at 15psi on a T3/T4 57 trim. Tuning is the GM SC reflash that I've been tweaking with HTP. I don't think its the tune. AFRs are great in boost and no knock is seen except once and a great while which if its seen is usually a little after it backfires/spark blow out. Plugs were fine last I checked. (2 runs ago) Theres no way that I know of to monitor the spark discharge in boost.
12.6 @ 114.6 MPH
What gap are you running. I think most are around .030" with boosted LD9s.
PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO
Just pulled the plugs again and they do look fine. However, I did notice I didn't have Iridium's in there like I thought. I had NGK TR6's in. The Iradium's I thought I had in there must have been my last setup. They still look good though. So which do you think I should put back in, TR6's or Iridium TR55IX's? I can't come across any heat range info for either, but if I remember right, the TR6's are cooler? which would explain why I put them in this setup over the Iridium's.
12.6 @ 114.6 MPH
NGK's #4177's I know for a fact are 1 heat range colder than stock. $1.68 a plug and work great.
I once tried the 2200 coils on my 01. It would always show a misfire on multiple cylinders yet the car never felt like it. I even used MSD coils and wires, no change. When backt o stock coil setup, and some tune tweaking, and bam no more.
FU Tuning
So which would be better:
--Boosted Z-- wrote:
Maxx Performance 9917 (Made by/same as Accell Super coils I believe)
Primary Resistance: 0.5 Ohms
Secondary Resistance: 8.0 k Ohms
Turns Ratio: 75:1
Maximum Voltage: 45,000 Volts
Summit Racing High output coils 850017
Primary Resistance: 0.38 Ohms
Secondary Resistance: 8.85 k Ohms
Inductance: 4.5 mH-5.6 mH
Maximum Voltage: 40,000 Volts
The Maxx performance/Accel ones have a higher maximum voltage, but the Summit ones have lower resistances.
And any idea what plugs are 2 steps colder?
12.6 @ 114.6 MPH
NGK LTR7IX-11 good plug there 2 step colder
