vettemann62

I attached a wired probe to the BOV's filter & sealed the probe so outside wind & temp would not influence the readings.

Doug from ECS does not think that recirculating the warm air from the BOV back into the SC intake is the best solution for those people who would like to quiet down their BOV sound. He has a solution which combines 2 BOV's. Cost is minimal.

However, I was curious just how warm the air would be, so....



Consider this:
a) It was only 74 degrees ambient. What would happen to the BOV temps at 90+ degrees!
b) I only did 4 controlled pulls in 1st gear, not boosted at all & the BOV temp was 158. What would happen to the temps if you were running the car at the track!

CRUISING AT 60 MPH....74DEGREES AMBIENT................78DEGREES BOV AIR TEMP

These were 1st gear only. I rolled slowly into the throttle as not to break traction. Once i hit the desired rpm I released the throttle & watched the BOV air temps rise quickly. There were 10 seconds between each pull. I didn't go any further do to the wet conditions.

Also at no time did I enter boost because of the weather.
When the weather gets warmer (and dryer) I will do more aggressive pulls in multiple gears. I am certain the BOV temps will be even higher as I was just babying the car & the Temps rose very quickly, especially when going higher in the rpm's.

06.Z51.MontRed.Vert

Excellent info, good job. When I read your post yesterday I full well expected the temp increases to be relatively substantial as you have ultimately found out. Personally I wouldn't want to be dumping that hot air back into the system, with or without meth. Looks like Dougs assesment was correct as usual.

I'm curious about the dual blow off valves (series or parallel) just to know. Initially I wasn't thrilled with the sound of a blow off valve, but like others I've gotten used to it and kind of like it now. Some of the cars I hear going by sound like JETS when the valve dumps, so ours is VERY quiet compared to most.

filmjay

Rerouting the BOV into the intake isn't a bad idea. But I wouldn't do it directly into the intake. I'd probably route it into the hot side of the intercooler so that it gets cooled before being sent back to the engine.

But I like the sound...so it wouldn't apply to me.

5 Liter Eater

Personally I'd be more concerned with the fact that you are seeing 158 degree IATs on a 74 degree day.

vettemann62

ecs mounts the bov on the bottom of the intercooler. It seems as though the air being expelled from the bov has not had a chance to run through the intercooler yet. So iat temps should be much lower. PLUS...I'M RUNNING METH!! So IAT's are gonna be realllllly l-o-w!

Another interesting point would be, i see some have their bov's mounted post intercooler. It seems to reason that the air temp being expelled from this point should be much cooler since it has already passed through the intercooler. In this situation, why not recirculate that air back into the sc intake? Still though, it's got to be much warmer than ambient temps.

I'm gonna let Doug add a 2nd BOV on April 20th. I keep you all in the loop!!

vettemann62

I dont think this would work because the air would be put back into the pressurized part of the system & would not allow for enough alleviation of air.

Le Mans Z06

Interesting finds, so what would the point of two BoVs be? I'm trying to figure this all out, so don't shoot me

vettemann62

HERE'S A QUOTE FROM DOUG AT ECS:

Just add a darn second BOV right next to the other one, which divides the amount of air going threw them in half, and the BOV noise goes away completely. Been there-done that several times for the "ultra stealth", high boost, BOV.
The cost is minimal, doesn't effect boosted conditions in the least, (we have done this on 800rwhp cars where the owner insisted on no BOV noise) and does not give any of the "whooshing" noise of a Tial 50 or larger type BOV's. Since each Bosche BOV is good for ten pounds, two have seemed to work great at 15-17lbs, without back surging the compressor, and staying quiet at the same time.

carlrx7

thumbs to doug. he is truly genius.

5 Liter Eater

Thats a good point. :o

Curious how the twin BOVs turn out.

TRIZ

Bro,
That's why we run I/C's and meth!

vettemann62

A-MEN BROTHER !!
It's interesting that only a couple of years ago, many SC guys were reluctant to add meth. Many said "it wasn't necessary". Well, I guess it depends on many factors, however it seems that it has proven itself enough to continue gaining popularity in the SC community. Plus having great tuners/installers helped tremendously!

PowerLabs

That is great data! Well done!
The heating is not surprizing though; you are going into boost, pressurizing the air (which always adds a ton of head to it),then releasing the hot pressurized air out of the bov. What I would like to see is what the steady state temperature is when you are cruising around at those RPMs, not the hot burst you get momentarily when releasing boost. Could you log that?

vettemann62

Thanks Sam.

UPDATED: CRUISING AT 60 MPH....74DEGREES AMBIENT................78DEGREES BOV AIR TEMP

PowerLabs

That's what I figured... Not very hot at all...

When my car is all done I will see if I can do some datalogs of IAT with and without recirculation, just for curiosity's sake.

vettemann62

Those who run meth will be less sensitive to Higher IATs

vettemann62

What I found interesting was that none of the above stats were during boost. They were purely based on rpm. I did do a few 40-70mph pulls in 4th gear hitting about 4 lbs of boost and the bov temps were not any higher than the ones I posted. It was wet out so I coulnt really lay into it. Will run more tests in a few days.

excessive81

if you dont want to hear it do duals...it WILL work becasue the amout of air being released is cut in half....as doug said.

PowerLabs

The amount of air released is still the same, it is just coming out of two holes so the air speed is halved, making the discharge a lot quieter

excessive81

i ment the amount each bypass valve sees