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Compressor surge, bad for carbs?


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Does anyone here not use a BOV? if so I'm curious if removing mine would damage anything other than the turbo. My thought is without the quick release of pressurized air from the BOV, would closing the throttle at boost damage the slides in the carbs since they'll still be experiencing 12+ psi of boost? My td05 is an extremely cheap Eblag one, and I'm planning an upgrade soon, so I'm not too worried about it. My issue is that the BOV hits the engine case and due to the awkward angle of the silicone pipe connecting it, leaks out boost. For the time being I plan to delete it with a pipe, but don't want to damage anything. ny not having a BOV while I build a new setup. Thanks.

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Don't have experience myself but have seen a 'ghetto' install that was done by a 'well known' tuner for a shootout that didn't have a BOV and he managed to blow the carb tops clear off - whether through over boost or over-run boost spike I don't know, either way it went with a bang.

IMO, the thing is, when closing the throttle @ 12psi boost, the already generated air flow which has velocity will hit the closed butterflies and can bend them, but because the air speed drops due to the restriction its pressure spikes upwards and is reflected back to the compressor blades possibly bending them. They may not break immediately but cycles of doing it over and over will fatigue them and they could break at WOT and then get ingested into the engine! So its not just the cheap Chinky turbo you risk but the engine as well!

Personally i'd keep the BOV and fix the connection problem !

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8 hours ago, rerb said:

Does anyone here not use a BOV? if so I'm curious if removing mine would damage anything other than the turbo. My thought is without the quick release of pressurized air from the BOV, would closing the throttle at boost damage the slides in the carbs since they'll still be experiencing 12+ psi of boost? My td05 is an extremely cheap Eblag one, and I'm planning an upgrade soon, so I'm not too worried about it. My issue is that the BOV hits the engine case and due to the awkward angle of the silicone pipe connecting it, leaks out boost. For the time being I plan to delete it with a pipe, but don't want to damage anything. ny not having a BOV while I build a new setup. Thanks.

I don't think not having a BOV is bad for a turbo, the only car I have seen what has a BOV from factory was a Lancer EVO.

 

 

Edited by Reinhoud
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On 7/26/2021 at 2:51 AM, Gixer1460 said:

Don't have experience myself but have seen a 'ghetto' install that was done by a 'well known' tuner for a shootout that didn't have a BOV and he managed to blow the carb tops clear off - whether through over boost or over-run boost spike I don't know, either way it went with a bang.

IMO, the thing is, when closing the throttle @ 12psi boost, the already generated air flow which has velocity will hit the closed butterflies and can bend them, but because the air speed drops due to the restriction its pressure spikes upwards and is reflected back to the compressor blades possibly bending them. They may not break immediately but cycles of doing it over and over will fatigue them and they could break at WOT and then get ingested into the engine! So its not just the cheap Chinky turbo you risk but the engine as well!

Personally i'd keep the BOV and fix the connection problem !

Makes sense. Better safe than sorry, thanks fore the answer. 

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