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Too cold?

Old 08-10-15, 11:33 PM
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Too cold?

Hi guys

got my FD tuned in april... all was good on the bench, 1,3bar, everything fine

run a street ported engine, haltech ps1000, oem 850 primary, id 2000 secondary, Precision 6266(gen1), walbro 400 pump on OEM hardlines, 3,5" DP and 3" rest, no catalyst
new AEM smart coils from SB and their harness...

anyhow, got it tuned all was good, got in the car going home... pulled real good.. drove for about 35km, and was going fast, caught up with a dumptruck so had to brake momentarily and got in third gear and floored it to get around him.. got boost.. then bang bang...
bad misfire...
The coils are then not even warm, my IAT is never over 45celcius(V-mount), don't have EGT reading thou... my voltage is stabile at 13,7+ volts, fuelpressure is rock steady...
running NKG SD11A plugs Trailing and BUR9EQP Leading..

Last week I got around to further look into the problem and went to my mapper and went out logging everything... Bought a house in april too, so time hasent been there for the car erlier

Anyhow, what we concluded was that it seems to miss and fire the fuel mixture when I have a IAT under 20 degrees C...
All above works, but after crusing a bit and seeing 16-17 degrees (V-mount), and I WOT, it misses when the turbo spools...

Wtf can I do about it? Run 9s leading and 11 trailing, the mapper did lean it out as much he dared, still on safe side.
Is my only choise to put on a smaller IC or what? 😁 now seeing a max of 45 degrees IAT on track, don't want it too high 😅

Since I live in sweden I get days and nights with pretty cold air, get 16-17 IAT even if it's 22-24 in the air outside, so pretty effective IC setup.
can it be tuned away?
Or what you think?
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Old 08-10-15, 11:55 PM
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are you sure it's not just rich misfire from your air temperature compensation settings?
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Old 08-11-15, 02:05 AM
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Yeah pretty sure, we set all those to zero enrichment, still no change :-/

Gonna go to the garage later today, will fix screenshots 😀

Last edited by Wolf_; 08-11-15 at 02:07 AM.
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Old 08-11-15, 04:23 PM
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here is some screenshots... anything else? =) over here we drive on 98 octane (RON), equal to youre 93 octane pump gas

since itīs cold out now and then in this northern country I wanna find the problem :P

















as I said, all over 20 celsius it runs like a bat out of hell, maxes 1,3 bar, like 19psi, but just when turbo spools in 3500 rpm and the secondary injectors come on when airtemp under 20, some hesitation and misfire.. 1.4 bangs depending on temps and so on...

any ideas? =)
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