I noticed since I put the larger turbo on my car when releasing the gas with a small amount of PSI built up (1-10) the bov will make a fluttering sound and nearly stall out the car. The car has to be moving at a slow speed for it to do this as well (less than 30mph). It will act normal however if I release with alot of boost. Is this a sign that the BOV needs crushed?

The fluttering is usually what happens if the 1g bov is crushed too much. It is not letting enough air out when you get off the throttle. I did it with my old 1g bov. I crushed it so much it would only open like 1/4 inch.

I just put on an RS60T and noticed the surge you are talking about at lower speeds and light boost. I haven't figured out why this is happening yet though because my bov is stock except for the Dejon leak stop kit which is disconnected because I lost the directions and need to call them.

The larger turbo's are flowing more thsan the bov can release so you get comopressor surge. A TGIAL solved mine. Mark

Haha well I would hope a Tial would. In all seriousness I am probable going to get a bigger one myself. I like those SSQV's alot.

A friend has the SSQV and a 20G, work well together. I have a Holset so wanted the largest BOV I could get and www.importevolution.com -one of our sponsors- sells them for $194.50. I still had to buy the lightest spring for it to work properly, #7 I believe. Mark

I agree it's compressor surge but a well set-up BOV is another solution, worked for me! Mark

This has nothing to do with the BOV.

When people say "Flutter" the sound that it makes is really compressor surge. You can remedy this by buying an "Anti-surge" or "port-shrouded" compressor cover.

OR, switch to a larger hotside. This will help your surge enough to save the turbo from getting beat up too much when driving light boost/light throttle every-day.

Either that, or get full boost before you let off the throttle!

peace

SpoOLxExO said:

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Either that, or get full boost before you let off the throttle!

peace

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Thats my philosophy. Full boost or no boost. I have enough off-boost power to get around town.

i had the same problem i just turned up the boost and it went away ,before it wound sound like a turkey

So, the 1g bov flutter, is it hazardous to the "health" of the turbo? I had a 14b start puking oil on me at the end of the summer after i installed a crushed 1g, (i needed a BOV quick and the price was right) it still opens around 18in/hg like it should, i can hear it whistling away when im coasting down hills and such. PM me if the crushed 1g BOV IS bad for turbos.

Compressor surge is definitely bad for your turbo. I don't know how you could quantify how bad it is however. Maybe someone knows if it is comparable to using antilag wth dsmlink?

bob

Turbo Talon DL said:

So, the 1g bov flutter, is it hazardous to the "health" of the turbo? I had a 14b start puking oil on me at the end of the summer after i installed a crushed 1g, (i needed a BOV quick and the price was right) it still opens around 18in/hg like it should, i can hear it whistling away when im coasting down hills and such. PM me if the crushed 1g BOV IS bad for turbos.

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The chrushed BOV is doine to raise the level ofboost at which the 1G BOV will egin to open losing boost. Won't hurt the turbo directly. Just if you overboost. mark

Turbo Talon DL said:

So, the 1g bov flutter, is it hazardous to the "health" of the turbo? I had a 14b start puking oil on me at the end of the summer after i installed a crushed 1g, (i needed a BOV quick and the price was right) it still opens around 18in/hg like it should, i can hear it whistling away when im coasting down hills and such. PM me if the crushed 1g BOV IS bad for turbos.

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The chrushed BOV is done to raise the level of boost at which the 1G BOV will begin to open losing boost. Won't hurt the turbo directly. Just if you overboost. mark
Forge makes a very nice bolt on BOV for both the 1 & 2g's. $170. comes with 4 springs and 2 shims and can be had as a recirculate model or atmospheric. I would go recirculate if I had the option. I could hear the BOV release when my filter was under the hood and recirculating. mark

HKS SSQV sucks, the tial is worthless unless you have a hx 40(sweet 97). The reason for the bov fluttering is very simple, they do not open up enough to release the amount of air required to not surge the turbo. I have the ssqv and under light throttle or partial throttle I cant fucing stand it My car bucks and everything else cause it just doesnt realese enough air. If you do this mod to the 1g bov it would be perfect. You will have quick response for partial throttle and you will be able to handle 25+psi.(and i only say 25 cause if you running anything more than that, that would require race gas and that means your racing and racing would require a tial or hks) Here is the link for the best bov for the dsm that 99.9% of you toonerz would need. You dont need a tial or hks for its just not worth the money to kill a turbo if your a daily driving dsm with a mild setup.

http://www.thedodgegarage.com/turbo_bov_mod.html

gSx_r1der said:

HKS SSQV sucks, the tial is worthless unless you have a hx 40(sweet 97). The reason for the bov fluttering is very simple, they do not open up enough to release the amount of air required to not surge the turbo. I have the ssqv and under light throttle or partial throttle I cant fucing stand it My car bucks and everything else cause it just doesnt realese enough air. If you do this mod to the 1g bov it would be perfect. You will have quick response for partial throttle and you will be able to handle 25+psi.(and i only say 25 cause if you running anything more than that, that would require race gas and that means your racing and racing would require a tial or hks) Here is the link for the best bov for the dsm that 99.9% of you toonerz would need. You dont need a tial or hks for its just not worth the money to kill a turbo if your a daily driving dsm with a mild setup.

http://www.thedodgegarage.com/turbo_bov_mod.html

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Whoa whoa whoa....

Take it easy poncho. Your running your mouth right now and have no factual data to back it up.

I already explained this...

"Flutter" as non-informed like to refernce this as, is compressor surge, period.

Lightening up the bov spring to allow the turbo to relieve pressure at light loads is only a band-aid solution to cars running big turbos on the street.

I have a SSQV on my car and I love it. Of course I know that because I still run a MAF set-up, I need to re-circulate the BOV back in the maf.

The SSQV has an available insert for just that. Do you run the insert? No? Thats probably why your car runs like butt...

So dont go off slandering high-quality BOVs, like the HKS/Tial units, which are great pieces.

My buddy runs a Tial on His 530WHP GT35R Sti. Thing is just as responsive as a 1g DSM unit. He runs 23 psi though, and doesnt run the turbo under the surge line by lugging the engine, or just boosting a few psi for no reason. It also has alot to do with driving style, or the lack thereof.

People put them on their setup, and complain of compressor surge because their turbo isnt sized correctly, or namely the turbine section, then they need to do more research.

If a turbo is selected for an advertised HP rating and run them under the surge line of its compressor map on the street because of the lack of supporting mods, engine condition, etc, then a light BOV is a band-aid solution.

Just because a 60-1 or what have you, will bolt up with a "custom" dsm turbine housing, does not mean that it will perform as it was intended as it was in the turbine housing it was designed for.

*Gasp*

I'm done

I've had "flutter" problems ever since I put my FMIC on. None whatsoever before that, but everything I've tried since the FMIC doesn't help-- 1G stock, 1G crushed, 1G with the Dejon kit, HKS. Same turbo, same boost level pretty much.

I am relieved to have "flutter" correctly called compressor surge as it truly is. I do have the TIAL with the 7# spring and it works great with the Bullseye turbine housing/Holset compressor. A 9# spring caused more surge. Now it can be driven in such a way as to get a bit of surge but I would have to try hard! I went through this for a while and guys were calling flutter different than comp surge.
With the light spring the TIAL is able to open quick and long enough to release enough of the charge air in the system. I tried the Forge, Dodge mod and the TIAL solved the problem. I have seen picds of Sean Glazer's car and he has dual TIALS next to each other on thepipe. Suppose he has a bit of boost, heh/! Mark

Sorry Mark, I wasnt addressing you in my last post.

I was simply talking to whats his face saying everything sucks , blah blah.

This problem is inherent with large turbos, buy a lighter spring will help one cope with it, is the answer to the thread w/o making it a pissing contest.

Nice setup you have there though Mark!

And yes, the Tial is a sweet unit.

Nothing personal taken. I just want those with "flutter" to know it is compressor surge and is not good and that I tried a couple of fixes with the TIAL and a 7# spring making driving my car enjoyable again! Mark

Mark, how much boost are you running with the Tial? I need to get my flutter problem solved somehow.

BTW, I'm still not 100% convinced that my flutter problem is compressor surge, simply because it didn't flutter with the same turbo and same BOV before my FMIC install. If someone could offer some suggestions as to why this happened, I'd really love to hear them-- like Mark, I'd like to make my car enjoyable to drive again too.

Doug I run 30 PSI on pump. Yes pump! I have a DSMchips chip by KEYDIVER with extended maps for guys with big turbo's running big boost so I have different timing map.
I believe when you added the FMIC you added a larger amount of charge air and your BOV cannot handle it. I would suggest a TIAL with the 7# sopring. I tried the TIAL and 9# and got surge. Buschur confirmed flutter IS compressor surge.
One of tuners sponsoprs, import evolution has the best price on the TIAL, $194.50. Most are around $220.

Thanks Mark. The Tial won't fit a 1G flange, will it?

I'm only running 20 PSI with an 18G, at around 34 lbs/min airflow. That's too much for an HKS SSQV?