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04-10-2017, 03:41 PM | #1 |
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Spark Plugs and gapping
So I was running my buddies Cobb Pro-tuned 2015 Subaru WRX on E30 (30% E85/93 mix) a few weeks ago, and we ran from a roll and were dead even from 40 to 100. My mouth was like "" because my car (2012 550i JB stage 1) hadn't giving me any issues other than an occasional Drivetrain Malfunction.
I figured it would be an easy win for me again a car weighing almost 1000 lbs less and making about 270-290 rwhp. I also noticed that his top end was stronger than mine and I had to short shift at 5900 rpms just to keep up. I realized something was wrong with my top end, the pull wasn't there and it felt like the car was running out of steam up top. I just replaced my plugs (BMW originals) about 12,000 miles ago and didn't think to check to gap. So today I pulled the plugs to clean them and check the gap. I found about 5 plugs gapped between .040 - .041 and 3 plugs gapped between .035 - .037. I gapped all of them down to .029 and WOW, what a HUGE difference! I'm ready to re-run my buddy again with my night and day difference on the top end. Always check the gap when you purchase plugs. |
04-11-2017, 04:09 AM | #2 | |
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04-11-2017, 10:01 AM | #3 |
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Does the OP have a 550i or a 535i? I have a stage 2 wrx and run a 12.7ish at sea level in the 1/4 mile @ 108 on 93 pump. I have been trying to decide between the 535i and 550i. If the 535i with a tune can keep up with a corn fed stage 2 wrx, then i'll get a 535i.
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04-11-2017, 04:17 PM | #4 | |
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535i MIssion Performance, PS2, Helix HPFP Kit, Wagner FMIC, Spec 3 clutch, Steel SMF, Wolf Racing CP, UUC SSK, GFB dv, SprintBooster, Custom Dynomax Exhaust, M5 Sways, Eibach OE Springs, Koni Sports Adjustable, Custom Short Ram CAI
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04-11-2017, 06:31 PM | #5 | |
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What year WRX? whats in a stage 2? |
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04-11-2017, 06:34 PM | #6 |
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04-11-2017, 08:10 PM | #7 |
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Mod list are in my footer. Followed instructions from mission
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535i MIssion Performance, PS2, Helix HPFP Kit, Wagner FMIC, Spec 3 clutch, Steel SMF, Wolf Racing CP, UUC SSK, GFB dv, SprintBooster, Custom Dynomax Exhaust, M5 Sways, Eibach OE Springs, Koni Sports Adjustable, Custom Short Ram CAI
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04-12-2017, 06:14 AM | #8 |
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i have a 2013 wrx. A stage 2 package is basically an intake, downpipe and a tune (either off the shelf or pro tune.) I also have equal length headers and a pro tune. In the newer 15+ models its a j-pipe instead of a downpipe, and to run E, you have to change out the fuel pump and go with bigger injectors. Simply put, stage 2 is bolt ons without upgrading the turbo and intercooler.
Stage 2 wrx's on E run in the 11.8-12.2 @ 116ish range at englishtown by me, I'm definitely interested in the 550i if they are running those times with just a tune. What does a 535i with a tune run? Sorry for the questions, I new to BMW and am trying to make an informed decision. |
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04-15-2017, 01:21 AM | #10 |
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Drives: 2018 Accord Sport | 1995 540i
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What is gapping?
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Bloo The Bimmer - 2012 BMW 535i (15%/5% Tint | Dual Slat Grillle | H&R Sports)
Bessie The Bimmer - 1995 BMW 540i |
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04-15-2017, 07:56 PM | #11 |
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06-07-2017, 04:02 PM | #12 | |
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He purchased these mods because I corrected my spark plug gap and was putting a few car lengths on him from a dig. He wants to run again after he get his mods installed and the only thing Im going to do differently is run race gas and gapping plugs to .022 Last edited by 535_BiTurbo; 06-07-2017 at 07:11 PM.. |
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