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Aug 9, 2008, 05:21 PM
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#1
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If you have a Synchronic BOV try this
Only give this setup a try if you have the Synchronic BOV recirculated, or if you are running a standalone and VTA. Make sure that Port C does have boost-only connected to it.
As you know, there are 2 ports on the back, which can produce 3 different combos of vac setups.
I want you guys to try all 3, and please post what your impressions are.
1) Port A&B to boost/vac
2) Port B only to boost/vac, Port A open to atmosphere
3) Port A only to boost/vac, Port A open to atmosphere
I'm most interested in seeing your impressions with running Port A only.
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Aug 9, 2008, 09:16 PM
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#2
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Currently running port A to vacuum, port B to atmosphere, port C to boost, and small preload spring removed. Quite nice in this orientation with only issues coming on during 5th gear highway passing scenarios where minute throttle modulation during slow build up of boost is required.
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Aug 9, 2008, 09:20 PM
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#3
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Quote:
Originally Posted by mitsuorder
Currently running port A to vacuum, port B to atmosphere, port C to boost, and small preload spring removed. Quite nice in this orientation with only issues coming on during 5th gear highway passing scenarios where minute throttle modulation during slow build up of boost is required.
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How is steady state throttle modulation in say third or fourth, in a condition like a long turn on a track where you use throttle modulation to maintain a line?
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Last edited by WhiteEvo05; Aug 10, 2008 at 11:54 AM.
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Aug 9, 2008, 09:30 PM
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#4
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Drives: 2005 Evo VIII, 2004 Infiniti G35 coupe, 2007 Acura MDX Sport
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Quote:
Originally Posted by mitsuorder
Currently running port A to vacuum, port B to atmosphere, port C to boost, and small preload spring removed. Quite nice in this orientation with only issues coming on during 5th gear highway passing scenarios where minute throttle modulation during slow build up of boost is required.
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Are you describing jerkiness in part throttle, low boost situations? Are you running the stock turbo?
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2005 Evo VIII: stock turbo, 24 psi with 3-port BCS, Buschur stg 3 head, HKS 264/272 cams, 750cc FI, Skunk2 catback, Perrin HFC/DP, PPI ported exhaust mani, Synapse BOV, ETS intake/IC pipes, Walbro 255 fuel pump, Megan coilovers, Hotchkis rear sway, Cusco front brace/trunk/rear strut bar, shifter bushings, Saikou Michi catch can, AGP motor mount, JDM MR taillights, 18x8 Rota Torque wheels, slotted rotors, SS clutch/brake lines, Hawk HPS, Spek gauges.
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Aug 9, 2008, 09:46 PM
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#5
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I'm tinkering myself on a stock turbo VIII MR. Part throttle DV flutter is much more muted in my opinion. Instead of a fast oscillation of the BOV, it is either fully closed or a small soft leak depending on how you have it setup.
I want to get actual users input on the Port A config before explaining what exactly is going on.
Last edited by Synapse; Aug 10, 2008 at 01:26 AM.
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Aug 10, 2008, 10:44 AM
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#6
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I'm running the first setup. I get a lot of jerkiness at low boost. I will try just running setup 3 today and see what it does. I really can't stand the first setup because it will not hold steady on a slow de-acceleration. It jerks pretty bad and its scary when going into a turn jerking.
I will post setup three hopefully today if not tomorrow.
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New times to come with new setup. Evo 9 turbo, Comp 280 Cams, XS Power TBE, UICP, PPI LICP, Hallman MBC, HKS intake, Walbro 255, Synpase BOV re-circulated, K-Sport Coilover, and tuned by SG Tuning in Reno, NV.
Times on Evo8 turbo, intake, JOE P. MBC, TBE, UICP, SG Tuned and all season tires.
11.83@115.8 @ sea level
60FT 1.773 114oct
11.86@111.4 @ sea level
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12.02@110.2 5000ft above sea level
60ft 1.803 114oct
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Aug 10, 2008, 11:13 AM
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#7
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I on a standalone and vernting to the atmosphere am running A and B Y'ed into one vacuum to intake manifold and C open to the atmosphere and the car has been excellent. Should C be to the atmosphere or should I close it up?
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2006 Mitsubishi Evo IX Dynoflash/ICS Performance built.
Precision 6262 Pump gas/Meth 800hp
2002 Porsche 996 TT GT Imagine Auto-Switzer
twin GT35R's 109 unleaded 1100hp (In Build)
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Aug 10, 2008, 04:35 PM
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#8
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No ports should ever be plugged. Port C should be to boost-only.
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Aug 10, 2008, 04:38 PM
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#9
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I have ran it each way so far. I think that set up 3 seems to work the best. With all 3 connected its a lil jerky nothing serious. then just a + b it would just flutter extra long. With only a connected now it seems more crisp and less flutter.
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Aug 10, 2008, 04:39 PM
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#10
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Drives: 06 Evo RS
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What is a good boost only source? The turbo nipple? I thought every port would always see vacuum at some point in time.
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Aug 10, 2008, 04:55 PM
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#11
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Evo8 do you have port c connected?
Turbo nipple is perfect for boost-only
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Aug 10, 2008, 07:35 PM
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#12
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do people run it with C open to the air? I was told to hook it up like I did (A+B Vacuum. C open to the air) Also its in your video set up like that.
S
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2006 Mitsubishi Evo IX Dynoflash/ICS Performance built.
Precision 6262 Pump gas/Meth 800hp
2002 Porsche 996 TT GT Imagine Auto-Switzer
twin GT35R's 109 unleaded 1100hp (In Build)
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Aug 10, 2008, 08:31 PM
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#13
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Drives: 06 Evo RS
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I was running C open to air and I was getting bad compressor surge. The instructions it came with said to leave it like that.
I just hooked port C to a boost only source and it fixed that problem. The valve sounds like its working a lot faster and moving a lot more air.
Part throttle is good as it always was.
For reference I have A to vacuum, and C to boost only. B is open to air.
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Aug 10, 2008, 08:48 PM
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#14
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when we first wrapped up the design, many of the test cars were aftermarket turbo with a later spooled unlike the Evo. So Port C being mandatory wasn't necessary at the time.
More testing told us that port c to boost-only is a must for anything over 6 psi of boost.
But bear in mind that every car is different. I have a guy in Australia running 2 bar without port c.
More and more testing and specific to the Evo is this config we're looking to get feedback on. You don't have to spend more money, just a hose swap.
Last edited by Synapse; Aug 10, 2008 at 11:55 PM.
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Aug 11, 2008, 07:08 AM
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#15
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Im running 35psi without port C and the car hasnt skipped a beat at least I dont think. I havent put her on the dyno but if you think I should hook up port C to a Boost source I will try that. I will be running about 44 psi all said and done with this BOV.
Suman
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2006 Mitsubishi Evo IX Dynoflash/ICS Performance built.
Precision 6262 Pump gas/Meth 800hp
2002 Porsche 996 TT GT Imagine Auto-Switzer
twin GT35R's 109 unleaded 1100hp (In Build)
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08, adjusting, boost, bov, eclipse, flutters, gas, gst, jerks, letting, liberty, port, ports, review, source, synapse, synchronic, wastegate  |
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