Did the search but couldn't find anything.

I've been thinking if there's are any benefit of running a maft blow-thru and having the BOV routing back to the intake. Most dsms have experienced running rich with BOV dumping to atmosphere on 2G mas (no dsmlink or ECU compensation). While blow-thru maft allowing you to vent BOV with minimium side affect. Would it also provide more benefits to have bov routed back? I would assume such benefits include faster spools up and recycle the precious cool air the turbo/IC have generated. Has anyone done this?

Sounds like a feasible idea but I would think that the "benefits" listed would be minimal, if anything at all.

However, I do think that if you were running a larger turbo that is pushing more air per min. that if there were any beneficial effects such as faster spoolup that they would be more apparent then doing it with a 16g style turbo or smaller.

Try it out and let us know what happens

But remember the air you are blowing off is already heated from the turbine and cooled alittle from I/C. Putting that warm air back through would make it even hotter... Just thought I would throw that out there to stir something up.

what would even be the point of paying the extra money to run blow through and not even vent? Just save the money and do the mass air/translator.

LA97GST said:

But remember the air you are blowing off is already heated from the turbine and cooled alittle from I/C. Putting that warm air back through would make it even hotter... Just thought I would throw that out there to stir something up.

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Actually air that is compressed then intercooled and then uncompressed is cooler than it was to begin with. That is how an airconditioner and a refrigerator work. Venting your bov is throwing away cold air. If that little bit of cold air really makes any difference is less clear though.

Seth

I'd have to agree with Brandon on this one. The idea sounds good in theory, but any advantage or gain would probably too small to notice or measure. Maybe slightly quicker spool (and I mean slight), but I dont think the temperature of the BOV discharge will make any difference. It may be cooler while exiting the BOV, but it is such a small amount and it would get heated up during compression again anyways. But, the only way to find out for sure would be to have a few different people try it out......

4gsx63 said:

Did the search but couldn't find anything.

I've been thinking if there's are any benefit of running a maft blow-thru and having the BOV routing back to the intake. Most dsms have experienced running rich with BOV dumping to atmosphere on 2G mas (no dsmlink or ECU compensation). While blow-thru maft allowing you to vent BOV with minimium side affect. Would it also provide more benefits to have bov routed back? I would assume such benefits include faster spools up and recycle the precious cool air the turbo/IC have generated. Has anyone done this?

Click to expand...

You can vent with the blow thru setup because of where the sensor is located in relation to the bov. If the senor is in front of the bov, then you have to recirculate so none of the air that the ecu accounts for is lost. If you place the sensor after the bov, then when you vent, it doesn't matter becasue none of that vented air was ever taken into account by the ecu. Recirculating the bov doesn't provide any advantages, it's a requirement depending on where the maf is located.

gheintz81 said:

if you ran a blow thru recirculated would it not cause the car to run rich in between shifts?

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No, because the air that passes through the bov was never accounted for at the MAF, so it doesn't matter where it goes when the bov opens up.

gheintz81 said:

if you ran a blow thru recirculated would it not cause the car to run rich in between shifts?

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When running blow-thru, the BOV discharge is unmetered, therefore it would have no affect on the engines tune. Air before the MAS has no affect on your tune; only the air after the MAS (metered air).

If you are using a 1g stock bov, recirculating is the easiest way to prevent the bov from ingesting unfiltered air at idle. Protecting the bov from unfiltered air and still having it function properly is not as easy as it might seem.

99gst_racer said:

When running blow-thru, the BOV discharge is unmetered, therefore it would have no affect on the engines tune. Air before the MAS has no affect on your tune; only the air after the MAS (metered air).

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Right on Paul.

There are 3 factors here that I think need to be looked at and tested to see if this idea would indeed create any benefits:

1. The temperature of the air upon release from the BOV - this factor would be largely dependent upon the outside temps, what type of intercooler system you are running, length of piping, etc.

2. The volume of air being released and its velocity from the BOV - I think this would have the biggest factor on any difference in spool...however if you think about it, when you are ripping through gears and lets say going from 2nd to third shifting at close to 7k, spoolup is really irrelevant.

3. The difference between the intake air temperature and velocity compared to the BOV dump's temp and velocity.

As I stated before, I really think you would only see a big difference with turbos the size of a 20g/50 trim or larger, and it would be so minimal that the cost of getting some 3" or 4" intake pipe with the return fitting plus a BOV that returns to replace your current venting BOV non return pipe setup couldn't be justified, at least IMO. Unless you are going from a MAS setup to a MAFT, then it miiiiiiiiiight be...

But Im not an engineer and I havent tested it either