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Gtir Motorsport club » Tech room » Help and Advice » Compressor surge

Compressor surge

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1 Compressor surge on 27th February 2015, 3:21 pm


After upping the boost to 1.6 bar on the dyno I seem to be getting a touch of surge at WOT and partial throttle around 5-6k onwards, dropping the boost to 1.5bar cures it at WOT but not at partial.  I know of others running a 3071 at 1.85bar and not having surge issues so curious as to why I am?

I thought perhaps too small intercooler piping but I'm pretty sure it's 60mm at it's smallest parts in the run so shouldn't be an issue, what else might cause a bit of surge? It's not a massive issue as I'm looking to go full 3" on the exhaust and run less boost but would like to know why.

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This video shows what I'm talking about despite the title,


Last edited by grim_d on 27th February 2015, 4:15 pm; edited 1 time in total

2 Re: Compressor surge on 27th February 2015, 3:52 pm

johnny gtir

Dose this not tie in with your large compressor to small turbine which will give give better low rpm enhance but will cause surge top end high boost

3 Re: Compressor surge on 28th February 2015, 10:35 am


I've really no idea, has been suggested to map the boost with my EBC as it has an rpm map function and reduce the gain when surge starts.

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