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Oct 2, 2009, 04:42 PM
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#16
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Evolved Member
Personal Sales Rating: ( 8)
Join Date: Aug 2005
Location: Socal :)
Posts: 1,904
Drives: 2006 GG MR :)
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For the folks with 'bucking' issues with the Forge, what spring are you using ? The flutter sound is not a bad thing- the valve is reacting to the vacuum to boost to vacuum changes ....I only experienced the bucking once and that was when I was at a really low RPM in 6th gear and then went 50% TPS....
__________________
3" Modified Megan Racing TBE & UR Cat.
Buschur O2 & Buschur Exhaust Manifold
Nisei LICP
DC2 oil catch can
Walbro Fuel Pump
Injen intake and UICP (w/ Perrin Filter)
ETS 3.5" FMIC
Zeitronix ZT2, ZAVT1, and Boost solenoid Failsafe
SMC Kit (50% Meth / 50% h2o )
GM 3 port BCS (28psi tapering to 22psi)
Enkei 17 x 9.5 NT03M 275/40 Azenis
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Oct 2, 2009, 09:49 PM
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#17
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Evolving Member
Personal Sales Rating: ( 12)
Join Date: Apr 2006
Location: South Florida
Posts: 318
Drives: 05 EVO MR
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I was using the stiff spring with shims so that it would hold boost when running meth.
__________________
HKS:Rs Intake/Hi Power Exhaust/272 Cams/Gears
4WS Engineering:Exhaust CutOut
4WS Tuning:Re-Flash
RevMotto:Mani Port/Exhaust housing port
Jegs:Electric CutOut Valve
Blitz:SUS Filter
Greddy:Informeter/TT
Hallman:RX Pro
MeGan:Dp
AWD Motorsports:Motor Mount kit
ACT:Pressure Plate/Flywheel/6 Puck
EBay:FMIC/O2 Housing
Zeitronix:Wideband/Egt/Boost/Meth Failsafe
SpoolinUp:Coil on Plug
Labonte: Meth Injection
Synapse:BOV
JDM Evo 9:Rear Bumper/Turbo
MUSE:LICP/UICP
Mitsu:5 Speed Conv.
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Oct 3, 2009, 01:33 PM
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#18
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Evolved Member
Personal Sales Rating: ( 8)
Join Date: Aug 2005
Location: Socal :)
Posts: 1,904
Drives: 2006 GG MR :)
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Quote:
Originally Posted by WickedWhtMR
I was using the stiff spring with shims so that it would hold boost when running meth.
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Well that sounds like your problem -- too stiff a setup will not let the DV do its job when you let off the throttle or are at part throttle loads...
__________________
3" Modified Megan Racing TBE & UR Cat.
Buschur O2 & Buschur Exhaust Manifold
Nisei LICP
DC2 oil catch can
Walbro Fuel Pump
Injen intake and UICP (w/ Perrin Filter)
ETS 3.5" FMIC
Zeitronix ZT2, ZAVT1, and Boost solenoid Failsafe
SMC Kit (50% Meth / 50% h2o )
GM 3 port BCS (28psi tapering to 22psi)
Enkei 17 x 9.5 NT03M 275/40 Azenis
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Oct 3, 2009, 06:28 PM
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#19
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Evolving Member
Personal Sales Rating: ( 12)
Join Date: Apr 2006
Location: South Florida
Posts: 318
Drives: 05 EVO MR
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Quote:
Originally Posted by cij911
Well that sounds like your problem -- too stiff a setup will not let the DV do its job when you let off the throttle or are at part throttle loads...
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Ok... so how would you have run it differently... I ran the medium spring with no shims when I wasn't running meth and it still fluttered. The stiff spring and the shims were necessary to hold boost when running meth.
__________________
HKS:Rs Intake/Hi Power Exhaust/272 Cams/Gears
4WS Engineering:Exhaust CutOut
4WS Tuning:Re-Flash
RevMotto:Mani Port/Exhaust housing port
Jegs:Electric CutOut Valve
Blitz:SUS Filter
Greddy:Informeter/TT
Hallman:RX Pro
MeGan:Dp
AWD Motorsports:Motor Mount kit
ACT:Pressure Plate/Flywheel/6 Puck
EBay:FMIC/O2 Housing
Zeitronix:Wideband/Egt/Boost/Meth Failsafe
SpoolinUp:Coil on Plug
Labonte: Meth Injection
Synapse:BOV
JDM Evo 9:Rear Bumper/Turbo
MUSE:LICP/UICP
Mitsu:5 Speed Conv.
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Oct 3, 2009, 06:39 PM
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#20
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Evolving Member
Personal Sales Rating: ( 37)
Join Date: Jan 2009
Location: Colorado
Posts: 143
Drives: 2004 Evo VIII
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I am also looking to switch to this one from a Forge. The fluttering in 5th gear drives me crazy! Doesn't it come with a flange for recirc? You can also use it as VTA correct? Reason I'm asking is I might switch to speed density.
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Oct 3, 2009, 09:51 PM
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#21
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Evolved Member
Personal Sales Rating: ( 8)
Join Date: Aug 2005
Location: Socal :)
Posts: 1,904
Drives: 2006 GG MR :)
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Guys, if you are using more spring than you should the car will buck. I am running the blue spring and having no issues running 29psi peak. On super low throttle, ~10% in evsoscan I get get the car to misbehave (this is caused by the vacuum to boost to vacuum transition...I addressed this by adding one shim.
__________________
3" Modified Megan Racing TBE & UR Cat.
Buschur O2 & Buschur Exhaust Manifold
Nisei LICP
DC2 oil catch can
Walbro Fuel Pump
Injen intake and UICP (w/ Perrin Filter)
ETS 3.5" FMIC
Zeitronix ZT2, ZAVT1, and Boost solenoid Failsafe
SMC Kit (50% Meth / 50% h2o )
GM 3 port BCS (28psi tapering to 22psi)
Enkei 17 x 9.5 NT03M 275/40 Azenis
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Oct 18, 2009, 10:09 AM
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#22
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Evolved Member
Personal Sales Rating: ( 8)
Join Date: Aug 2005
Location: Socal :)
Posts: 1,904
Drives: 2006 GG MR :)
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^ Update - one spacer/shim was not good for my setup - really bad bucking at ~10 psi and low throttle.
I have now installed a stiffer WGA and removed the shim in the Forge DV (just blue spring) and will see how this works. Obviously this is a problem / issue with the Forge design as one has to 'experiment' to get the proper settings and even then it may still be an issue.
If this does not work I'll try the softer spring (yellow). Either way I'll report back with my findings...
I wish the guys from Forge would come on here and specifically address which setup to use for which boost scenarios.....
__________________
3" Modified Megan Racing TBE & UR Cat.
Buschur O2 & Buschur Exhaust Manifold
Nisei LICP
DC2 oil catch can
Walbro Fuel Pump
Injen intake and UICP (w/ Perrin Filter)
ETS 3.5" FMIC
Zeitronix ZT2, ZAVT1, and Boost solenoid Failsafe
SMC Kit (50% Meth / 50% h2o )
GM 3 port BCS (28psi tapering to 22psi)
Enkei 17 x 9.5 NT03M 275/40 Azenis
Last edited by cij911; Oct 18, 2009 at 10:11 AM.
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Oct 19, 2009, 08:49 AM
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#23
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Newbie
Personal Sales Rating: ( 0)
Join Date: Feb 2007
Location: lewisville, TX
Posts: 61
Drives: 05 apex silver EVO
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so synapsis is a good swap for people who are going for turbo upgrades and who are still in stock turbo?
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Tags
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boost, bov, bucking, complaints, evo, forge, hks, part, rs, source, synapse, synapsis, synapsis bov, throttle, tuning  |
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