Compressor surge / waste gate flutter??? Need help. - EvolutionM - Mitsubishi Lancer and Lancer Evolution Community

Notices
Evo X Engine / Turbo / Drivetrain Everything from engine builds to the best clutch and flywheel.

Compressor surge / waste gate flutter??? Need help.

Reply

 
 
 
Old Dec 17, 2015, 11:32 AM
  #1  
Newbie
Thread Starter
iTrader: (3)
 
Stubbie68's Avatar
 
Join Date: Apr 2013
Location: Yorkville, IL
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
Compressor surge / waste gate flutter??? Need help.

Hey all,
I have an 08 Evo X and I recently put windows in the block. I decided it was time to upgrage. Bought a long block and upgraded the rods, pistons, bearings and headstuds. Also picked up a Garrett GT3076R turbo configured for stock frame fitament with the smaller compressor housing (designed for the X). Just got the car tuned at Boostin performance in Hoffman Estates, IL. After picking up the car I have found it is almost impossible to drive. It will cruise at a given speed smoothly and WOT is also fine but anything inbetween is a nightmare. The car bucks and studders with any amount of throttle especially at highway speeds. Light throttle produces bucking constantly and heavy throttle (not wide open) I can hear the BOV purging several times in rapid succession. The car could only be tuned to 29 PSI and at that point the waste gate duty cycle was 100% according to the tuner. he could not get any more boost out of it. I have been told to replace the BOV and also possibly upgrade the waste gate actuator spring pressure. Supporting mods are :Synapse BOV, Greddy EBCS, AMS 3.5 in. intake, Map performance UICP and LICP, 3.5 in. intercooler, tubular headers, full 3 in. exhaust all the way back to a magnaflow muffler, no cat, Megan racing O2 housing, Invidia down pipe/test pipe combo.
I really need to figure this out. I want to get rid of the bucking and jerking but I would also like to get more boost and power out of the mods which the tuner said is being left on the table because of the configuration. Any advice will be welcomed. Thanks.

P.S. Yes the entire fuel system is upgraded sufficiently. Didn't think that was relivant so I didn't add it.
Stubbie68 is offline  
Reply With Quote
Old Dec 17, 2015, 11:55 AM
  #2  
Evolved Member
iTrader: (3)
 
shekaar's Avatar
 
Join Date: Jul 2013
Location: Baltimore
Posts: 615
Thanked 24 Times in 24 Posts
Take Boostin's advice. I'm guessing Devin tuned you? They're very capable over there, and know your vehicle better than anyone on this forum would at this point.
shekaar is offline  
Reply With Quote
Old Dec 17, 2015, 12:50 PM
  #3  
Evolved Member
 
hoobastnk90's Avatar
 
Join Date: Feb 2012
Location: Ofallon, MO
Posts: 1,254
Thanked 21 Times in 21 Posts
Why don't you just let them know the car is hard to drive im sure they could adjust it to make it smoother.
hoobastnk90 is offline  
Reply With Quote
Old Dec 17, 2015, 01:19 PM
  #4  
Newbie
Thread Starter
iTrader: (3)
 
Stubbie68's Avatar
 
Join Date: Apr 2013
Location: Yorkville, IL
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by hoobastnk90 View Post
Why don't you just let them know the car is hard to drive im sure they could adjust it to make it smoother.
I did. Just came from there this morning. They said there is nothing they can do.
Forged bottom end, GT3076R turbo 375hp/329tq on a mustang. They even said they couldn't get the boost over 29. I was at 29 psi on my stock turbo before the upgrades. Something is not right. I just need to figure out what it is. And I don't have unlimited resources to throw at it to find out.
Stubbie68 is offline  
Reply With Quote
Old Dec 17, 2015, 02:03 PM
  #5  
Evolved Member
iTrader: (1)
 
letsgetthisdone's Avatar
 
Join Date: Oct 2013
Location: Las Vegas
Posts: 10,630
Thanked 531 Times in 507 Posts
Boost has nothing to with drive ability. Was a boost leak test performed?


How is the synapse BOV setup?
letsgetthisdone is offline  
Reply With Quote
Old Dec 17, 2015, 09:18 PM
  #6  
Newbie
Thread Starter
iTrader: (3)
 
Stubbie68's Avatar
 
Join Date: Apr 2013
Location: Yorkville, IL
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
I agree with that to a point. Boost itself does not but how that compressed air is released back into the intake system can. Or is that not a correct statement?

Yes they said they did and I paid for a boost leak test.

The synapse is setup to recirculate and both A and B ports are connected to vacuum. Its also in a push configuration meaning the boost is pushing the valve closed and vacuum opens it. Anything else I missed?

Last edited by Stubbie68; Dec 18, 2015 at 06:30 AM.
Stubbie68 is offline  
Reply With Quote
Old Dec 19, 2015, 04:21 PM
  #7  
Evolved Member
iTrader: (1)
 
letsgetthisdone's Avatar
 
Join Date: Oct 2013
Location: Las Vegas
Posts: 10,630
Thanked 531 Times in 507 Posts
Originally Posted by Stubbie68
I agree with that to a point. Boost itself does not but how that compressed air is released back into the intake system can. Or is that not a correct statement?

Yes they said they did and I paid for a boost leak test.

The synapse is setup to recirculate and both A and B ports are connected to vacuum. Its also in a push configuration meaning the boost is pushing the valve closed and vacuum opens it. Anything else I missed?
No, it's not. The bov opening dumps the charge, so the car loses power. When it flutters, the car gains and loses power rapidly.

Do you have the stiff or soft spring in the synapse?
letsgetthisdone is offline  
Reply With Quote
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
EvoIX89
Project Cars and Build Threads
62
Dec 4, 2017 04:12 PM
51
Evo General
12
Oct 18, 2016 12:43 PM
Jax419
Midwest Region
1
May 17, 2016 08:17 AM
rodent
Drag Racing
23
Mar 7, 2016 05:52 AM
TrendSetter
Evo Engine / Turbo / Drivetrain
4
Jan 18, 2016 05:15 AM


Thread Tools
Search this Thread
Quick Reply: Compressor surge / waste gate flutter??? Need help.


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.