[_ink]

Hard to diagnose until you have your tune dialled in mate. You need to decided which tuning path you're taking like I mentioned to you before.

It could just be the combination of low boost levels and WGDC with upgraded turbos and inlets causing strange turbulence.

[Socket]

Originally Posted by _ink

Hard to diagnose until you have your tune dialled in mate. You need to decided which tuning path you're taking like I mentioned to you before.

It could just be the combination of low boost levels and WGDC with upgraded turbos and inlets causing strange turbulence.

Agree mate is difficult when part way through an upgrade. I think I'll go with the custom wedge tune but not sure what other options there are other than Cob. jB4

[EB89]

Originally Posted by Socket

Strung together some of the sounds coming from the turbos in an audio clip
Was in peak hour traffic so was not able to go WOT, mostly just trying to capture the sounds passing the morning traffic where I could
Some are the tial blow off valve but the woodland creature hooting sounds WTF? turbo flutter, loose intake pipe sucking air?

It sounds like you are playing a melody pop.

[Socket]

Melody Pops - Classic.

[e36mmm]

Something is not right. Hopefully it's a cheap fix.

[Socket]

Update

One solution to the weird turbo/intake sounds was to increase size of the vac reference line from the manifold to the BOV. The theory is that the stock vac ref line is too small to allow the BOV to respond quickly enough with the increased airflow from the RBs and VTT intakes.. makes sense.. So Vtt (aka Vince) and I set about increasing the size of the vac ref line to 6mm
I can report the weird sounds have been reduced but not resolved. It has definitely helped but there is something else going on here.. Pics of the upgrade below (thanks Vince for your help )

Pic 1 - The man himself (vince the Wiz) Spcgry in BG
Pic 2 - CP, BOV and other stuff removed so we can get to the manifold
Pic 3 - Puny stock nipple for ref vac line to BOV
Pic 4 - New 6mm nipple for ref vac line to BOV
Pic 5 - 6mm line to BOV

[bradsm87]

Looks the goods. That along with a softer BOV spring should do the trick for sure. The next step softer than the included spring is the white painted spring from Tial.

[vtl]

Hard to find a bloody brass nipple suitable for the mod! This kind of stuff is easy to find online but a bitch to find locally in store if you need something quickly. We had ordered a barb that didn't show up for the weekend so had to buy a hose fitting from Bunnings and machine down the barb to get the 6mm vac line to fit on the oversize barb.

Tapping the intake manifold was easy though, the tap didn't bind at all and cut through the plastic like butter. Sealed up the threads with teflon tape, saves us from using messy epoxies (and the cure time) and the tape is rated to 260deg C

Sat in the car with the new mod and still makes wierd noises, although its much much better than what was in the video.

Socket how you finding that different Alpina flash?

[Socket]

New Alpina flash is a massive improvement over the old one. D mode is almost worth driving in again lol

[DR-JEKL]

Originally Posted by vtl

Hard to find a bloody brass nipple suitable for the mod! This kind of stuff is easy to find online but a bitch to find locally in store if you need something quickly. We had ordered a barb that didn't show up for the weekend so had to buy a hose fitting from Bunnings and machine down the barb to get the 6mm vac line to fit on the oversize barb.

Maybe try a pneumatic specialist like pirtek etc in the industry these types of fittings are dime a dozen in industrial workshops.

Good to see that it's improved, whats the next step socks in troubleshooting this issue?

[Socket]

Might get a tune done as per Inks suggestion and maybe a check of the inlet connection to the turbos

[iliketurtl3s]

Sockie please confirm if Vince's hair was on point?

[Socket]

Originally Posted by iliketurtl3s

Sockie please confirm if Vince's hair was on point?

Hair was tight bra

[bradsm87]

Originally Posted by Socket

Might get a tune done as per Inks suggestion and maybe a check of the inlet connection to the turbos

Softer BOV spring really really should do the trick. The flutter is caused by the slight back off of the throttle not generating enough vacuum to overcome the BOV spring pressure and open the BOV. The bigger hose eliminates the restriction causing lag but it still does need the softer spring for the BOV to open as early as possible in all situations. I had this on my S14 and it went away completely on my S14 after changing to a softer BOV spring.

http://www.tialsport.com/documents/w3_tial_qqr_sp.pdf

[vtl]

After the mod, I didn't hear any flutter and noticed there was a little bit of squawking under low throttle conditions if you played with the throttle right. Like the bov pressure differential was not enough to open the valve fully but there was enough airflow to make noise.

Letting off the throttle at high boost seemed to sound ok.

Softer spring should be the next step as long as it still holds boost.

[bradsm87]

Holding boost won't be an issue. See the bottom line in that Tial PDF document in all capitals.

[Socket]

Originally Posted by bradsm87

Holding boost won't be an issue. See the bottom line in that Tial PDF document in all capitals.

anyone know where I can get my hands on a white tial BOV spring?
What am I thinking lol... Ill post a WTB on the classifieds

[Socket]

RGB AEs are just awesome

[bmwheath]

Originally Posted by Socket

New Alpina flash is a massive improvement over the old one. D mode is almost worth driving in again lol

Are the shifts still as fast & firm as the old Alpina flash?
I would love my D mode back

[bmwheath]

Also, the flutter is caused by to firm of a bov spring, sounds cool sometimes, but really isnt lol

[EB89]

Is the Alpina flash available for DCT?

[Socket]

Originally Posted by bmwheath

Are the shifts still as fast & firm as the old Alpina flash?
I would love my D mode back

D is an improvement but is still too sluggish IMO