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Old 02-08-2013, 11:46 PM   #1
Crave31
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Join Date: Jul 2012
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Default 300 whp at Cobb

Yesterday I had my car dyno'd at Cobb Plano. I was amazed by the numbers my stage 2 2012 WRX put down but a little concerned with what they called boost creep. I have a catless DP, AEM CAI, SPT exhaust on stage 2 OTS Map. My car put down 300hp/335 ftlb tq but they said the DP was causing uncontrollable boost and could end up causing issues down the road. Should I go with a catted DP? Or go with an EWG and a EBCS? Also they suggested a better IC...

What should I do?
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Old 02-09-2013, 12:11 AM   #2
HinshawWRX
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They gave you the options, choose one.

I would go EWG and EBCS, but that's just me. Without a budget we can't tell you what to do.
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Old 02-09-2013, 12:59 AM   #3
curiousfish
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you went to Cobb themselves and they are giving you sound advice. Not many ppl on here will give any advice that would be better than theirs.
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Old 02-09-2013, 01:11 AM   #4
Gallo2011
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The EBCS will be the cheapest of the three, but as others have said, go with what the Cobb guys tell you.
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Old 02-09-2013, 01:46 AM   #5
krambte79
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I bet they told u to buy their downpipe/ exhaust to magically make the boost creep gremlins go away ;/
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Old 02-09-2013, 02:01 AM   #6
bestfromnw
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proper dyno tune can eliminate a boost creep or a grimspeed ebcs
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Old 02-09-2013, 03:15 AM   #7
jebjkey
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Quote:
Originally Posted by bestfromnw View Post
proper dyno tune can eliminate a boost creep or a grimspeed ebcs
No it cannot.

Boost creep is any uncontrollable rise in boost over WG spring pressure. It is purely mechanical and no amount of tuning will fix it. You cannot control boost when WDC is already zero and boost just keeps going up.

Mechanical changes are the only fix to a mechanical problem.

A 3-port EBCS will not control boost rising at higher RPM's any different than a bleed EBCS, and it certainly will not fix boost creep. A 3-port EBCS makes tuning boost easier because you do not need a bleed pill in the boost control line. The bleed pill size will dictate the boost range you can control with a bleed EBCS setup. Change the pill size and WDC will up / down for the same boost value depending on whether the new pill is larger ( WDC will be higher) or smaller (WDC will be lower). A 3-port EBCS allows you to control the entire boost range of the turbo without changing any parts (i.e. the bleed pill).

For example; the stock mapping for WDC in my EVO MR is 100% (for stock boost levels). That boost control system is effectively the exact same except there are two bleed pills in the system. I removed both and put in a single smaller bleed pill and now WDC is 60-65% for stage 2 boost levels.

Tuning will fix what some people incorrectly call boost creep. If tuning fixes your problem, then it was a tuning problem. You have to test / data log to determine if there is a tuning problem or a boost creep problem (hint look at WDC).

Set WDC to zero (or connect a hose from the turbo outlet nipple directly to the WG actuator nipple) and do a WOT data log. What does boost do?

Mine went well over 20# in 6th gear and would hit at least 18# in 4th gear every time - with 0 WDC. I already have a catted DP so I ported the WG and put a stock airbox back on the car. Doing the same test again, I only hit ~14# max at 0 WDC. That is still technically boost creep since WG spring pressure is ~9#. I no longer have a boost creep problem though since the peak value is below my target boost value. I now have control of boost using WDC, so any over boosting is now a tuning problem, not a mechanical problem.
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Old 02-09-2013, 11:58 AM   #8
manticus
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Got advice from professionals? Screw that, go to the Internet.
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Old 02-09-2013, 12:01 PM   #9
Crave31
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Thank all of you guys! I am obviously going to work on what my budget allows but WG and EBCS with protune may be the way to go. Also is changing the stock WRX IC a good idea even without a bigger turbo? $800-$900 is a lot to swallow if its not necessary yet. I live in North TX (4 months of horrible summer heat) if that makes any difference.
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Old 02-09-2013, 12:03 PM   #10
Crave31
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Oh and Manticus- thanks for your smart assed comment! D!ck!
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Old 02-09-2013, 12:22 PM   #11
HinshawWRX
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A better intercooler is always a good idea, regardless of where you live.

And you cannot be mad at people like Manticus, you got SOUND advice from professional tuners and came to an internet forum were 1 out of every 10 people might have an idea. You wanted advice to justify what a leading tuner said, based on a handful of people that MIGHT comment.
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Old 02-09-2013, 12:31 PM   #12
manticus
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Quote:
Originally Posted by Crave31 View Post
Oh and Manticus- thanks for your smart assed comment! D!ck!
Yeah, I wasn't intending to poke at you too hard - If I were you, though, I'd trust those guys at Cobb. They've been doing it a long time and they will know your car far better than anyone trying to guess here. Here you'll get some misinformation, some gentle ribbing, and then some really good advice - but even with good advice here they still won't have all the details that Cobb does about your car.
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Old 02-09-2013, 12:37 PM   #13
Crave31
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The reason I came on here to ask questions is because MAYBE someone with similar problems or scenarios would tell me what they did to alleviate their potential issues. I know you can get poor advice from here... I'm not doubting what any professional suggests... Just was wanting to make sure I'm not getting stuff I may not need... Like a catted downpipe instead of a EWG and EBCS plus tune.
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Old 02-09-2013, 04:24 PM   #14
ejicon
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Listen to what Cobb told you. They know what they're doing. They're a business and need to make money but with the experiences that I've had with them, they've always been about pleasing their customers instead of trying to make money off of you.
They actually make money by pleasing them because you end up bring your car back to them.
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Old 02-09-2013, 04:55 PM   #15
bulldog2277
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Listen to your friend Joe, and give him $$$, and fill out your profile, and be happy that your car is faster than Patricks STI...
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Old 02-09-2013, 06:16 PM   #16
Crave31
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Thanks Joe! Sure you can have my money! And I'll professionally detail your car as well! Sounds like a great deal!
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