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09-16-2018, 03:53 PM | #1 |
Spark Plugs for Rotrex Supercharger
Hey all,
I recently installed the Rotrex c15-60 supercharger kit from Power Enterprise. Yesterday I installed a set of NGK BRK7EIX spark plugs after reading that with S/C applications people recommend going with a colder spark plug and a narrower spark plug gap. Afterwards I got a CEL that read misfires in all cylinders (along with knocking), so I took the NGKs out (they were covered in carbon deposits) and replaced them with the stock Densos. However, since I have reinstalled the old spark plugs I find that the acceleration is a bit sluggish and there's still a bit of knocking, but no misfires. Can anyone advise what I should do next? Last edited by phaznet; 09-16-2018 at 07:21 PM. |
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09-16-2018, 05:14 PM | #2 |
Drives: 06 Polar White 5dr, 13 Soul 4u Join Date: Oct 2008
Location: Georgetown, Ontario, Canada
Posts: 5,762
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Are you running a higher octane fuel now? S/C doesn't like 87.
Sent from my Elite_5_5_Octa using Tapatalk
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09-16-2018, 05:24 PM | #3 |
Yes I am running 94 octane atm
Last edited by phaznet; 09-16-2018 at 07:22 PM. |
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09-17-2018, 07:41 AM | #4 |
Drives: bB NCP 31 2005 y Join Date: May 2011
Location: KHABAROVSK RUSSIA
Posts: 19
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Ставь 7-ки
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09-17-2018, 05:42 PM | #5 |
09-18-2018, 05:37 PM | #6 |
Drives: 2018 Yaris SE 5MT Join Date: Aug 2017
Location: Kincardine, ON, Canada
Posts: 273
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d00d you can't just casually post "I installed a rotrex..." like that - thread on install and setup needed asap! lol
My suggestion was going to be add a degree colder plugs, but clearly that wasn't working for you... Are you all setup to monitor air-fuel, fuel trims, etc..? Possible spark is fine and you're leaning way out? -- Adam |
09-18-2018, 06:03 PM | #7 | |
Quote:
I went two degrees colder. I read somewhere that they recommend a spark plug with a heat rating of 7. Maybe I should try the 6? In that case should I go with the OEM gap of 0.044, or should I go narrower? I do have a CEL that's showing 2 codes: P2195 - Oxygen Air/Fuel Sensor Signal Stuck Lean Bank 1 Sensor 1 P0171 - Air/Fuel Mixture System Lean Bank 1 Other than the occasional knocking the car is running fine. |
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09-18-2018, 09:09 PM | #8 |
Drives: 2007 yaris 3 door Join Date: Sep 2015
Location: Denver, Colorado
Posts: 1,000
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what are you using for fuel management?
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09-19-2018, 07:00 AM | #9 |
I believe its the Split Second PSC1-001 Programmable Signal Calibrator, but I haven't tinkered with it yet...
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09-19-2018, 11:14 AM | #10 |
feed my pet
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I'm also using NGK's BKR7EIX on a NA setup. Thai modders swear by this plugs over Denso. I'm not sure if my minor issues are due to this plugs; rough starts during morning & slight engine knocking at low rpms.
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09-19-2018, 05:12 PM | #11 |
Drives: 2018 Yaris SE 5MT Join Date: Aug 2017
Location: Kincardine, ON, Canada
Posts: 273
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Hmm.. I'm by no means an expert, but from what I've read 2 temps cooler and tighten up the plug gap is the way to go.
Those are definitely the OBD2 codes I'd expect if you're running too lean. P0171 I'm familiar with, the P2195 I had to look-up, but it sounds like you're leaning out to the point that the ECM can't compensate. Not knowing how you're fuel management is setup with the Signal Calibrator I don't know what to say other than give her more fuel! In all seriousness, you're running really lean, so my guess is add fuel and get closer to stoich. and then see if the cooler plugs work for you. Ideas that come to mind.. Does the Power Enterprise kit come pre-mapped? Any chance the map got cleared / defaulted? Kit came with bigger injectors? Injectors and everything all installed? (i.e. not mid-install and 'trying it out') Connections all good (and correct) to interrupt the signals to the ECM? -- Adam |
09-19-2018, 11:09 PM | #12 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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you don't need colder plugs unless you're making about 100hp over stock or it's a dedicated race car. Colder plugs with just foul up because they're not getting to operating temps to burn away carbon deposits as the stock heat range is designed for.
Figure out your AFR before messing with anything else. If you're getting knock, you're running lean. |
09-20-2018, 06:18 PM | #13 | |||
Quote:
Quote:
Quote:
And you're all right, I'm running very lean. I checked AFR and it showed a Lambda value of 1.20, so 17.6. |
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09-21-2018, 08:15 PM | #14 |
Drives: 2018 Yaris SE 5MT Join Date: Aug 2017
Location: Kincardine, ON, Canada
Posts: 273
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Hmm.. I think I'd dive into the tune to be honest. I've never heard of the Split Second PSC1-001 Programmable Signal Calibrator, so no idea how easy / difficult it is to play with or what it uses for software, but it's probably the best place to start delving into. See what you can do to push some more fuel and get out of this lean condition.
p.s. not trying to be pedantic, just trying to get an idea of your setup to see what I can throw out for ideas.. Keep us posted what you get into! -- Adam |
09-23-2018, 07:50 PM | #15 |
Drives: 2007 yaris 3 door Join Date: Sep 2015
Location: Denver, Colorado
Posts: 1,000
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where is your fuel pressure? is it a return system?
can you check the duty cycle of your injectors? can you check the spray pattern of injectors? used parts my have set around for a wile and varnished up. you have a fuel issue somewhere. i would guess it's ECU... |
09-29-2018, 08:30 PM | #16 |
Drives: 2018 Yaris SE 5MT Join Date: Aug 2017
Location: Kincardine, ON, Canada
Posts: 273
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Any luck with your lean condition? Curious to know how you made out if you've had a chance to look at it..
-- Adam |
09-30-2018, 01:01 AM | #17 |
Thanks for the responses everyone :)
I connected to the piggyback ECU via Split Second's R4 software and verified that it was working properly and had fuel maps loaded. The AFR reading stays fixed at 18.12/1. I'm wondering if it's normal that the piggyback ecu forces the AFR sensor to read lean. Other than that the car and supercharger seem to run fine; I only get a knock on engine startup. |
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10-01-2018, 08:24 PM | #18 |
I think the problem might be with the o2/AFR sensor because it only shows an AFR (measured) value of 18.12, regardless of throttle input. The commanded AFR value, however, does oscillate.
Or, is the piggyback messing with the o2 sensor signal to force it into open loop? Short term fuel trims are sitting around +20% at idle! Still, I think i'm going to bring it to a tuner to have a look. |
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