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Old 01-24-2009, 01:05 AM   #1
afviper
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Default 2007 Wrx Vf39

2007 WRX wagon, VF39 turbo, CSS TMIC, Invidia catted DP, STI catback.

Just got back from a tune at Kito Auto Sport on the Mustang dyno with some surprising numbers. It made 265 hp at 5600rpm and 293 trq at 3700rpm. The only thing that worries me is the way the torque peaks early on, and the boost seems way too high at 21.8 psi. Does boost seem right to you, or should that peak not be there?

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Old 01-24-2009, 02:12 AM   #2
PikkaGTR
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22lbs seems like a lot
when I was stg2 07sti it only peaked to about 18-19
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Old 01-24-2009, 02:22 AM   #3
afviper
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I bought the car with the VF39 turbo already installed so I am not sure if the previous owner replaced the wrx restrictor pill. I'll try taking a look at the pill tomorrow and see if it is the small wrx one or if it was already drilled/replaced with the sti one. I'll have to talk to the tuner on Monday and figure this out, hopefully I won't be charged for a full tune if it needs to go back on the dyno.
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Old 01-24-2009, 12:13 PM   #4
Bullwinkle1983
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21-22 PSI is fine in the midrange with the VF39, as long as it doesn't overboost on the highway. I'd be more concerned about the "boost bump" at peak torque there. Looks like your tune is overshooting boost targets and overcompensating.
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Old 01-24-2009, 12:16 PM   #5
HSBabyFace
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I'm guessing this is 91 octane.... and what kind of EM are you using
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Old 01-24-2009, 12:42 PM   #6
afviper
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Actually 92 octane, and it was protuned.
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Old 01-24-2009, 12:52 PM   #7
sidewayz
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a little lean???
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Old 01-24-2009, 02:05 PM   #8
cucamelsmd15
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Im gonna go out on a limb here and say thats a pretty poor tune.
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Old 01-24-2009, 04:39 PM   #9
boston_errol
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Isn't the 2.5" STI catback a bit too small for your goals?
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Old 01-24-2009, 05:24 PM   #10
afviper
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I just wanted something quieter than the SPT catback that was on there when I bought it. I also don't really have goals for big power, my goal is to get it to run safely, 22 psi doesn't sound like a safe boost number to me. I doubt that the difference of .5" in the catback makes much difference in power. From what I read the biggest restriction in the stock exhaust is in the cats in the downpipe.
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Old 01-24-2009, 06:37 PM   #11
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Quote:
Originally Posted by cucamelsmd15 View Post
Im gonna go out on a limb here and say thats a pretty poor tune.
I would say your on the right track.
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Old 01-27-2009, 03:23 PM   #12
afviper
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I got a reply from Kito Auto Sport, and it sounds like they will take care of the problem for free! They will put in the STI restrictor pill and get the boost down to the levels I am looking for.

I also have a question on where the AFR should be. I am not sure what is considered to lean or too rich. It seems like AFR dips down too much when boost hits is 10.3 way too rich? Also, should AFR be a bit more rich as the revs rise? Would AFR above 12 cause really high exhaust temps?

If this is getting a bit off topic I can go to the tunning forum, just let me know.
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Old 02-02-2009, 06:31 PM   #13
littlewhitewagon
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Yes, lean will cause high exhaust and cylinder temps.

You should try to stabilize the boost gain and keep the AFR from leaning out.
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Old 02-03-2009, 11:03 AM   #14
captain spaulding
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I'd highly recommend picking up a GM BCS and have that tuned the next time you goto the dyno, that would likely get rid of your boost issues and give you better response from the turbo, it did wonders on my TD04.. you don't need it, and others will probably tell me I'm an idiot and dunno what I'm talking about(isn't that the NASIOC way?), but this is just from personal experience..
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Old 02-03-2009, 11:39 AM   #15
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Quote:
Originally Posted by captain spaulding View Post
I'd highly recommend picking up a GM BCS and have that tuned the next time you goto the dyno, that would likely get rid of your boost issues and give you better response from the turbo, it did wonders on my TD04.. you don't need it, and others will probably tell me I'm an idiot and dunno what I'm talking about(isn't that the NASIOC way?), but this is just from personal experience..
+1 or the ingersoll-rand is even a little better. Nice smooth boost control with no overboost issues. Just need to put it on before your tune so they can work with it. I think Kito used to carry them.
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Old 02-03-2009, 12:15 PM   #16
captain spaulding
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+1 or the ingersoll-rand is even a little better. Nice smooth boost control with no overboost issues. Just need to put it on before your tune so they can work with it. I think Kito used to carry them.
yeah, I actually got the flying performance one, which is the same as the Ingersoll-Rand BCS..
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Old 02-03-2009, 12:22 PM   #17
Bullwinkle1983
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Quote:
Originally Posted by captain spaulding View Post
yeah, I actually got the flying performance one, which is the same as the Ingersoll-Rand BCS..
As long as it's the 3-port design, they're all basically exactly the same (Perrin, GMBCS, etc).
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Old 02-03-2009, 02:39 PM   #18
Pink sOck12
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nice!
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Old 02-03-2009, 04:23 PM   #19
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nice numbers, curves could be a lot smoother
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Old 02-06-2009, 07:34 PM   #20
afviper
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Got the car retuned with the STI restrictor pill installed. Very happy with the results, I asked for a more conservative tune that would work with California 91 gas without knocking. Got just that, boost is now smooth with no peak, the AFR is taken at the tailpipe so it is not accurate on the graph, AFR is where it should be when measured at the front o2 sensor. Spool is earlier than it was, and there is a lot more torque down below 3000rpm. I have nothing but good things to say about Kito Auto Sport, they didn't charge me anything for the second tune, or for the STI restrictor pill that they supplied and installed.

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Old 02-06-2009, 08:01 PM   #21
Silver Bullet 2.0
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those are pretty good numbers for that dyno with a vf39, I got my car tuned there too, and it reads lowww.
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Old 02-06-2009, 08:03 PM   #22
afviper
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It does read low, they told me a stock STI makes about 230hp on the dyno.
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