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01-20-2005, 07:34 PM | #1 |
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Adding a mbc to hit target boost???
hello, im currenntly running Cobbs stage 2.5 map with a vf34, header, fuel pump, and larger intercooler and im not hitting target boost anymore because of my header and large tmic. i even use cobbs restrictor and i only hit 15-16 psi max (if im lucky) with my vf-34 i know i should be safe at 17-18 psi. i want to use a MBC to band-aid my problem. does anyone have experience doing somthing like this? will using the new MBC to controll my boost have any negative effects with my set-up?
also what is the correct way to install a mbc? do i still use the oem boost controll solinoid along with the mbc, or just use the mbc by itself? also will i leave the restrictor on with the mbc or take it off? thanks.
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01-20-2005, 07:54 PM | #2 |
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if you do a search on over in the EM tuning forum, there was a post I caught where that was deiscussed.
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01-20-2005, 08:06 PM | #3 | |
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01-20-2005, 08:09 PM | #4 |
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Adjusting wastegate arm may be a better way to go than a MBC. At least that is what i would try first.
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01-20-2005, 08:53 PM | #5 |
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i dont have an adjustable wastgate arm, thats why i think my only option now is get a mbc.
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01-20-2005, 08:59 PM | #6 |
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Woops OK then i would go for the dual MBC
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01-20-2005, 11:15 PM | #7 |
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try and MBC and try to log it with someone elses delta dash, it sound be fine cuz cobb takes care of PTFB.
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01-20-2005, 11:50 PM | #8 |
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If i use a mbc how can my Cobb ecu take care of PTFB? do you always get PTFB with a MBC?
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01-21-2005, 12:19 AM | #9 |
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Yes, PTFB is the main problem with MBC. Thats why you need a dual stage MBC With a switch that you control or is controlled by the TPS. Set one at 8 to 10 PSi for normal driving, the other at 17.5 or more when TPS is 90% or more. I never actually tried this but i'm thinking about it.
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01-21-2005, 12:33 AM | #10 | |
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01-21-2005, 12:42 AM | #11 |
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what the hell are you guys talking about
COBB MAPS EXTRA FUEL FOR PART THROTTLE FULL BOOST, therefore that problem with a MBC is NULL. Have you ever gone 60% throttle on your cobb? notice you go past 10 psi? i dont know about the part mbc possibly throwing the boost curve off. |
01-21-2005, 02:46 AM | #12 |
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Why not just tune it in for the added components.. oh wait thats right cause you can't, all the more reason to get a UTEC. J/K Yeah a MBC will do want you want, just be warry of the PTFB conditions that come with owning a MBC, and watch your EGT.
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01-21-2005, 10:39 AM | #13 |
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well my egt gauge is inop right now, i will try this and use a wide band o2 to make sure its all good.
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01-21-2005, 10:50 AM | #14 |
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Yes i think a WOT switch would be easier but like ben wrx said, cobb maps go to full boost after 60+ % throtle so throtle position sensor switch would be the best. I was thinking 90% before but that was for stock.
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01-21-2005, 11:52 AM | #15 |
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Target boost for your map is 16.5 +/- .05, so if your only hitting 16 your not that far off. Have you tried resetting your ECU? I am a huge COBB guy, but if you want to run outside your setting ( like 17 or 18psi) I would have to say go with a tunable version or you could wait for the access tuner like me !
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01-21-2005, 01:01 PM | #16 |
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well i installed a TXS MBC and this is what happened, i set it to 17 psi and and it builds boost faster and stops right at 17 psi with no spikes at all, its also very consistant as compared to the slower oem ebc. i guess just as long as i stay at 17 psi everything should be ok. what do you guys think?
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01-21-2005, 01:16 PM | #17 |
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As long as you can keep the boost uder 10 PSi at under 60 % throtle it should work with no troubles. That's hard to do, but can be done . I had my MBC on for 2 years with no probs. Just had to change the way i drove. Now i'm not recommending a MBC just saying it can be done if you know what to watch for, and can make yourself do it.
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01-22-2005, 09:55 PM | #18 |
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Sorry it took so long. Been bussy...
I searched back and found what I was thinking of here , now I'm off to the airport in 8 hours to leave the snow behing and go skiing in rainy BC's Whistler.
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01-22-2005, 10:45 PM | #19 | |
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01-23-2005, 12:58 AM | #20 | |
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On the top end towards redline is where I would be worried with a MBC and Cobb stage 2.5. |
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01-23-2005, 02:05 AM | #21 |
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he can check it with his wideband, get a walbro 255 in there
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01-23-2005, 02:47 AM | #22 | |
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