Do Turbo Recirculation Valves Spool Faster Than Blow Off Valves? BOV vs Turbosmart for Performance

[@gsmecanica]

That is the exact analysis I was looking for mate, thanks a lot for sharing!!

[@camiloquiros2343]

Bro what an amazing video this is. Thank u very much, it was really helpful. I love the sound of my HKS BOV on my Suzuki Swift Sport, and my friends were telling me over and over to set it to recirculate, but I didn´t want to loose the sound. This video was the answer I needed, with actual measured data. Thanks again!

[@iainlangley]

This buggy just keeps getting better and better. An amazing build!

[@Big_Gima]

The only thing i’d say is some people aim the recirc right at the turbo blades. But the cars that need a recirculation valve are the cars that have a mass airflow sensor. Because if you calculate the air at the mass airflow sensor, but then vented to the atmosphere that was air already counted in the tune, and then that air has now been removed so the ECU thinks that air is still in the system when it is not causing a rich condition and sometimes stalling. For example my 06 sti needs a recirculation valve or atleast one of those 50/50 valves.

[@hurryimrussian1445]

thank you so much for this, people tell me bov is a waste but id rather have the sound over .05 seconds of faster spool

[@joelveilleux98]

Great video. Always wondered with a complete standalone if it made any difference.

[@Mr3X7R3M3]

The main reason factory setups used to use recirculating was because they didn’t use MAF like we have now. They recirculated the already-counted air back into the system so the old computer wasn’t expecting more air than it was getting

[@davidwallis4567]

I agree with this comment, the recirc valve is not fitted for spool it is fitted to ensure the quantity of fuel added Is correct for the quantity of air added. The MAF sensor (mass air flow) measures the quantity of air sucked into the engine, based on this air quantity, the ECU calculates how much fuel to add. If you blow off a proportion of that air (let it escape to atmosphere) the ECU is still going to add enough fuel for what the MAF is telling the ECU is the quantity of air that the engine has ingested. So a vent to atmosphere will cause the engine to run rich at the point of the air blowing off. This is why when a recirc valve is fitted it recirculates the boost back into the system after the MAF (engine side of MAF) so the quantity of area is not measured by the MAF sensor again. If you are using a MAP (manifold pressure sensor) to control the fueling it does not make a difference to to he fueling if use a recirc valve or a Blow off valve is because the blown on off air is not seen by the the map sensor. Hope this makes sense to everyone.

[@wagonsdaily]

I appreciate you adding that last part. First thing I said was a turbo that size really wouldn’t benefit from it as much as a GT35. OEM manufactures also use them to minimize noise that the average buyer doesn’t want to hear. Nice vid 👌🏾

[@liftedviewz]

Really appreciate all the knowledge in this video!

[@felipebutcher]

excellent analysis! really good seeing those graphs. but i was curious... why yours doing re-circulation still did the tsshh sound while the factory ones doesn't?

[@cherylmartinez3001]

most factory turbos have it as part of the turbo from what i understand its ran differently so you dont get over pressure. i could be entirely wrong.

[@felipebutcher]

​@@cherylmartinez3001as far as i know the factory ones are pretty similar. but they are more covered, more plastic, and the engine is enclosured. i think thats why.

[@cherylmartinez3001]

@@felipebutcher it looks like the factory turbos for the most part have a waste gate part of the turbo that opens pretty easily to dump into the exhaust and dont run a BOV, they say most modern stuff on the other hand comes with a recirc valve, but since his is aftermarket and running higher boost i would assume is the reason you could hear it.

[@mykethompson8177]

Great video, currently in same situation running recir(same kompact as yours) and just thinking of plugging the recir pipe to intake. I've read the reason why Manufacturers use recir set up is due to MAF sensors in intake. venting off that metered air causes the system to run lean for the quick second, which hurt cats. but on custom set up without cats, no issues.

[@xXAsunaxKiritoXx]

Wait, I thought they run rich because the ecu has accounted the fuel amount for that metered air that isnt there anymore

[@BOB24502]

On the graphs, you should have overlaid the time when boos pressure drops right after you closed the throttle, instead of comparing how quickly the boost comes back on. Really in order to make a difference, you would need a check valve on the pipe between the air filter and the tee where the recirculation valve dumps the boost back in the charge pipe. Without it, all the boost pressure is vented backwards through the filter

[@FangOfTruth]

Manufacturers maybe limiting contamination possibilities in case valve sticks open. Also recirculating heated (from compression from turbo) air and heating it again with recirculating valve would seem a negative.

[@jason-things_to_do]

Whats stopping the positive recirc pressure to just pass out the air filter?

[@DirtGearTv]

Really just the vacuum from intake

[@colmmorley]

Are you still using the standard open diff in the gearbox?

[@DirtGearTv]

Yep, an lsd would be awesome but few parts like this available. The oem has been working really well though

[@colmmorley]

@@DirtGearTv ya an LSD would make it. I've mine welded but as for low speed tight corners and driving around the house its not great and hard work😒 but way better traction for off roading or sliding about😂

[@theilluminatimember8896]

This machine sounds amazing 🤩

[@theilluminatimember8896]

Also, really useful video. I was very curious if it would make any difference. For my car I can buy an aftermarket recirculation or atmospheric bov. This video tells me the only difference is the sound.

[@oliverhayesthecreator4988]

You should do this same test with a 100% recirculator

[@rogerbrooks1048]

It show more of a difference in higher gears.

[@Eastern_SA]

You should try “no BOV” and post the result.

[@DirtGearTv]

Great idea!

[@sambitdas9416]

You're cool; subscribed

[@eldrickejleest]

13:10 conclusion

[@jiminverness]

I loathe the blow off valve - outside of the track that is. It tends to attract unwanted attention.

[@iainlangley]

...also....is that a new laptop after the last one took a bath?

[@DirtGearTv]

Yep 😂