[flatthump]

Originally Posted by HOLLYW00D

my tial 38mm does this. it also surges: "sha sha sha sha" in quick succession in high boost (20psi) and higher rpm (4500+) instead of a consistent "whaaaaaaaaa". my boost is fairly steady, however, is this a problem? i have a 13psi spring (.9 bar) and have it connected same way as a wastegaate actuator in interrupt using the hybrid boost control method (ebcs + mbc). top port is VTA. any suggestions as to what may remedy the situation?

You're actually talking about something different. I'm talking about the surging following the throttle plate closing some. The reason yours sounds like this is because you're using an EBC. An EBC uses duty cycles to actuate the waste gate. It will make that 'wha wha wha' sound right as you get into boost. It's actually not a problem. Don't worry about it. If it bothers you a lot, get rid of the ebc and run an MBC. That's what I do.

[HOLLYW00D]

excellent, thank you. i had attributed my sounds to the pulsing of the ebc, but i wasn't positive since i have it clamp at 100% duty cycles when i go WOT. it's reassuring to know that it's normal.

as for the louder "WHA" as you let off, i can't speak for eroc263, but mine is just a short burst; no pulsing. i guess it's just getting rid of the excess gases because i'm calling for no boost when i let off?

[praha-sti]

Thank you for the FAQ, good stuff ....

Anybodying running a EWG with a Catted DP?

[HOLLYW00D]

Originally Posted by praha-sti

Thank you for the FAQ, good stuff ....

Anybodying running a EWG with a Catted DP?

i am. have a helix catted DP and running an IAG UP with v-band 38mm tial EWG VTA using included (in IAG kit) dump tube.

[eroc263]

Originally Posted by flatthump

What bov do you have? You ever hear it surge? Mbc? Surging will do that to an EWG. When you're making enough boost, then shut the throttle plate enough, there is a little boost spike if the bov/bpv can't vent it quickly enough.

I am using the APS dual vent valve. I've haven't heard any surge whatsoever. I may try loosening the spring adjustment on the valve a little to see if that helps any. I am using an EBCS only. No hybrid method or anything. I'm not to worried about it anymore. I've just been telling myself it's normal. Ha.

Originally Posted by HOLLYW00D

excellent, thank you. i had attributed my sounds to the pulsing of the ebc, but i wasn't positive since i have it clamp at 100% duty cycles when i go WOT. it's reassuring to know that it's normal.

as for the louder "WHA" as you let off, i can't speak for eroc263, but mine is just a short burst; no pulsing. i guess it's just getting rid of the excess gases because i'm calling for no boost when i let off?

This is exactly what mine does. Just a short WHA that lasts no longer than the sound of a BOV releasing pressure. What BOV are you using? How much boost?

[HOLLYW00D]

@eroc263, i'm using a crushed stock BPV @ 21psi

[lAlexSavesTheDay]

great write up

[praha-sti]

Was it a tight fit? How much space do you have, think you can get a pic for me? I'm pondering the 44mm (Grimmspeed set up), but really not sure if all that will fit with my DP (maybe a 38mm will fit for sure)?

Here is my DP w/cat - if you can get a similar pic of your set up, I'd be greatful!

Originally Posted by HOLLYW00D

i am. have a helix catted DP and running an IAG UP with v-band 38mm tial EWG VTA using included (in IAG kit) dump tube.

[FleaDog]

My uppipe setup worked with my helix cat'd (bellmouth + cat), but i threw on an HKS catless to see how I like it.

[praha-sti]

Looks nice without the cat too. How much clearance did you have with the Catted/DP?

I like how your dump tube is heat wrapped too, lol :-) Nice ;-)

Originally Posted by FleaDog

My uppipe setup worked with my helix cat'd (bellmouth + cat), but i threw on an HKS catless to see how I like it.