Finally got VF39...kinda disappointed - Subaru WRX Forum
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post #1 of 27 Old 06-03-2009, 09:27 PM Thread Starter
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Finally got VF39...kinda disappointed

Hey guys I finally saved up enough for a VF39 swap, STI TMIC, and Walbero 255, and a protune. I'm kind of dissapointed though however. Heres the dyno sheet for it
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They said the boost soleniod couldnt handle 18psi, and I needed a TGV delete to open up a lot more power, and I'm wondering if its worth the extra money, and if it will really make a big difference. I got it tuned a year ago on a mustang dyno with just catless downpipe/turboback, and it dynoed at 228awhp and 283awtq. Now its 233 awhp and 262 awtq on mustang dyno. The curve is also a little difference, so in all reality it feels a lot slower and less responsive than my old tune. Any help would be greatly appreciated. Don't know if I just got a bad tune or the sti turbo wasn't a good way to go or need to do the TGV delete/Boost soleniod. Thanks a lot guys!!!
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post #2 of 27 Old 06-03-2009, 09:31 PM
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I definitly suggest an upgraded boost soleniod.. The TGVs.. propbably not that big of a difference on that turbo..

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post #3 of 27 Old 06-03-2009, 09:42 PM
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Is it possible that the first numbers were wrong? 68 horse over stock seems high for a tune and a turboback to make to me. But if you've actually noticed a negative change in the feel, then I don't know. Is it the same tuner?

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post #4 of 27 Old 06-03-2009, 09:47 PM Thread Starter
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Alright, where can a buy the soleniod and which is the best one to go for?

yeah possibly, they ran it a couple times though. No, it was a different tuner, but i was thinking most people with vf39 ran anywhere from 250-300 depending on the dyno.
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post #5 of 27 Old 06-03-2009, 09:53 PM
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My brother with a SPT intake, cobb catless downpipe, and maddad whisper made 307 whp on a dynojet i think. Is the tuner reputable?
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post #6 of 27 Old 06-03-2009, 09:55 PM
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I was quoted at 260 with that setup, except for the addition of an STi bottom end and headers. That was what a reputable tuner said is common for my setup(pdx tuning, mustang dyno). So I'd say 230ish sounds about right.

It's very strange that you would only net 5 hp, and lose 2o tq. I definitely would have gone to the same tuner who was able to get you 70 horse out of a catback. That guy sounds amazing. Maybe this IS just a bad tune...

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post #7 of 27 Old 06-03-2009, 10:40 PM
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could be the time of year as well. if you got your tune in the winter, the numbers would be higher vs the summer in which you could be heatsoaked
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post #8 of 27 Old 06-03-2009, 10:42 PM
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The real question is. What was the first dyno on? Dynapak? I mean that's a important detail. 233whp sounds weak on mustang dyno. Supposedly my weak a$$ stage 1 tune from my tuner puts me at about 220 ball park on their mustang dyno. I'm saying it's weak and conservative. They're saying all they did was minor fuel corrections and slightly bump over stock. I'll have a stage 2 TBE and perrin BCS protune coming after the 15th. So, I'll have some numbers to compare with you shortly.

As far as BCS: prodrive, perrin, grimmspeed, and the GM typhoon BCS are all good options from what I hear.

Edit: Paulie does make a good point. Numbers vary from day to day and the conditions.
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post #9 of 27 Old 06-03-2009, 11:41 PM
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That looks like the printout for a mustang dyno.
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post #10 of 27 Old 06-04-2009, 12:57 AM Thread Starter
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Yeah both dynos were mustang dynos, the first one was tuned by vividracing (haha I know they have a bad reputation but my car felt awsome, it had so much pull from like 3000rpms on. Maybe it was the conditions since its like 110 in Arizona right now, and the last time I got it tuned it was December so it was roughly 60-70. Also they didnt put an sti splitter when they installed the tmic, could that make a difference at all? The people who I just got it tuned from was a place called FAT
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post #11 of 27 Old 06-04-2009, 01:24 PM
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I almost hate to ask but, what boost level were you peaking at with the Vivid tune? You mentioned that this guy at FAT stated that your current BCS is not holding so what are you peaking at now? Is the problem simply the boost in flow rates.. I know it sucks, but I would get a new BCS and get a retune from a better shop...

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post #12 of 27 Old 06-04-2009, 01:47 PM
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+1 for a retune somewhere else and a 3 port bcs.

rollin on 17's now and they're dirty
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post #13 of 27 Old 06-04-2009, 04:11 PM Thread Starter
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Quote:
Originally Posted by LiL Shoaf View Post
I almost hate to ask but, what boost level were you peaking at with the Vivid tune? You mentioned that this guy at FAT stated that your current BCS is not holding so what are you peaking at now? Is the problem simply the boost in flow rates.. I know it sucks, but I would get a new BCS and get a retune from a better shop...
I'm not sure exactly what he set it at, the printout he gave me only had the hp and tq, but i'm sure i could call him up and ask. The people at FAT said the highest they could get it was around 15psi I think. Yeah I think that is my best bet, should I go back to vivid, or is there anyone you recommend in the phoenix area that does good work?
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post #14 of 27 Old 06-04-2009, 06:20 PM
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I would go to the people you first took it to, but definetely get the bcs before u go.

rollin on 17's now and they're dirty
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post #15 of 27 Old 06-04-2009, 06:44 PM
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cant compare numbers from diff. dynos...they all read different. and chase... isnt 220 whp and 280 wtrq about right for a stage 2 2.5wrx???

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