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Hesitation after augmented boost

Old 16 May 2016, 10:58 AM
  #1  
sugus
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Default Hesitation after augmented boost

Hi Scoobynet

My Impreza GC8 from 98 has been running stock boost (0.95bar) up until now. It runs fine - but when I raise boost to 1bar with an MBC, it starts hesitating and idling rough. Sometimes it'll cut out. If I let it sit overnight, it'll be fine the day after, until I hit 1 bar again.

It's running NGK 6 spark plugs - could this be a symptom of this plug being too hot for the new boost level, or does it sound like a totally different problem?

Current mods are:
1 bar through mbc
Downpipe with sports cat
Sports catless from dp
Simota panel filter, silicone hoses
Walbro fuel pump

Last edited by sugus; 16 May 2016 at 11:05 AM.
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Old 16 May 2016, 12:47 PM
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Tidgy
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so you upped the boost, played around with the exhaust, changed the fuel pump, didn't have it mapped and wondering why its driving like a bag of spanners?
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Old 16 May 2016, 03:51 PM
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sugus
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No it has been running fine, and I know several people with a similar setup (no remap) on a gc8 that run fine. The old classics seem a little more forgiving.

I'd just like to have everything in order (spark plugs etc.) before a remap.
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Old 16 May 2016, 04:16 PM
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Best of luck, bud.
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Old 16 May 2016, 04:28 PM
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It needs a remap, simple.
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Old 16 May 2016, 04:34 PM
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sugus
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If that's all it needs, I'll just go for it - I just wanted to make sure nothing else was an issue before taking the step. Thanks.
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Old 16 May 2016, 09:08 PM
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alcazar
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Again...best of luck. The 98 ecu isn't remappable.
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Old 17 May 2016, 05:37 AM
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sugus
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Exactly: I'll need a different ecu, hence my wish to minimize risks before this expensive operation.

Since you all advise me to just do it with the same std. spark plugs and everything, I may be overthinking the "prepping stage".
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Old 17 May 2016, 12:19 PM
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for the price of em chuck some 7's in instead of 6's to make sure.
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Old 17 May 2016, 12:29 PM
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plug gap ?
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