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Old 10-28-2008, 07:59 PM   #1
mywifesSTi
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Default 295whp not enough

I had my sti tuned recently. My #'s were 295whp. I was a little dissappointed with the top end power. The car feels like its got nothing after 5500. My tuner said he had trouble getting the car to hold boost & to check for an exhaust leak. After investigation I found I was missing a stud on the dp and plenty of soot. I scheduled another road tune. With the leak fixed will I see a gain in whp? Or can I do something like a cai before the road to gain a little more top end?
My mods are:
maddad unequal length headers & up pipe
maddad catted dp
maddad 3" whisper cb
K & N Typhoon Intake
walbro 255 fuel pump
ap V2
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Old 10-28-2008, 08:34 PM   #2
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Probably feel alot better after the next tune. Wait and see. Make sure to post results
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Old 10-28-2008, 10:34 PM   #3
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If it's your wife's STi I doubt she'll enjoy a CAI lol
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Old 10-29-2008, 05:27 PM   #4
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I might do the phenolic spacers, p&p the intake manifold & turbo inlet.
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Old 10-29-2008, 05:34 PM   #5
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If the leak is post-turbo, you likely won't notice a huge difference. It's going to be hard to improve the top-end on that turbo, but EWG/methanol, and some other goodies can help. Ever thought about a better turbo? A 20g will spool up nearly as fast as the 39 but have WAY better midrange and top-end.
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Old 10-29-2008, 05:41 PM   #6
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Td0620g Ftw!
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Old 10-29-2008, 05:43 PM   #7
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Bigger turbo get rid of that little vf39. 18g w/8cm or 20g. Get tuned on a dyno not street tune.
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Old 10-29-2008, 05:44 PM   #8
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Quote:
Originally Posted by mongoosaroo View Post
Td0620g Ftw!
TD06 wheel in a 20g is arguable for efficiency's sake. Go Dom3
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Old 10-29-2008, 06:04 PM   #9
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Quote:
Originally Posted by Audiosavvy View Post
A 20g will spool up nearly as fast as the 39 but have WAY better midrange and top-end.
The midrange would be about the same, the 20g would shine in the 5K rpm and above range. On pump gas they are pretty close, especially on CA91.
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Old 10-29-2008, 06:46 PM   #10
mywifesSTi
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Quote:
Originally Posted by Audiosavvy View Post
If the leak is post-turbo, you likely won't notice a huge difference. It's going to be hard to improve the top-end on that turbo, but EWG/methanol, and some other goodies can help. Ever thought about a better turbo? A 20g will spool up nearly as fast as the 39 but have WAY better midrange and top-end.
I know the vf43 is not a top end monster, but I know it's capable of more than 295whp. I will eventually put a bigger turbo on, prob fpgreen when I can afford it.
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Old 10-29-2008, 09:08 PM   #11
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Quote:
Originally Posted by mywifesSTi View Post
I know the vf43 is not a top end monster, but I know it's capable of more than 295whp. I will eventually put a bigger turbo on, prob fpgreen when I can afford it.
295 is actually a pretty good number with that turbo. As most wll say it has very little topend and once you step up to a bigger turbo you will see how little it actually had.
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Old 10-30-2008, 12:17 AM   #12
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I'm selling my Green, If your interested
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Old 10-30-2008, 12:34 AM   #13
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Get a real tune (dyno). How do you know what your car put down with a road tune? When you get a real tune, be sure to post as to what type of dyno and smoothing for comparison purposes. Regardless, your numbers aren't bad, but you definately have room for improvement.

San
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Old 10-30-2008, 01:19 AM   #14
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Quote:
Originally Posted by mywifesSTi View Post
I know the vf43 is not a top end monster, but I know it's capable of more than 295whp. I will eventually put a bigger turbo on, prob fpgreen when I can afford it.
Look up the 12.0 stock turbo 07 thread by STIMIKEY
07 STI with just stage 2 and a good tune can be a solid low 12 sec car. While still maintaining the stock like manners.
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Old 10-30-2008, 09:58 AM   #15
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07 sti which those glass pistons could be the issue--but 295 is not that bad

dave
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Old 10-30-2008, 10:29 AM   #16
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Quote:
Originally Posted by oldmansan View Post
Get a real tune (dyno). Regardless, your numbers aren't bad, but you definately have room for improvement.

San
A road tune is better than a tune on a dyno, with the exception of the speeds you must get to. I really don't see much more room for improvement on this set up.

OP what kind of dyno was the car run on? That may be why the number was lower than expected. If you've ever looked at other vf39/43 setups they usually fall flat around 5500 as well.
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Old 10-30-2008, 10:53 AM   #17
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^^^^^beat me to it!!!!

Quote:
Originally Posted by oldmansan View Post
Get a real tune (dyno). How do you know what your car put down with a road tune? When you get a real tune, be sure to post as to what type of dyno and smoothing for comparison purposes. Regardless, your numbers aren't bad, but you definately have room for improvement.

San
Quote:
Originally Posted by TurboWRX32 View Post
Bigger turbo get rid of that little vf39. 18g w/8cm or 20g. Get tuned on a dyno not street tune.
street tunes are just fine....think about it....the car is performing in the actual enviroment it will once you get OFF the dyno. You can tune throughout the rpm band in different gears and get a better overall driveable tune. no worrying about loads and correction factors etc. The best way is to start on the dyno then go fine tune on the street.

OP, get a gt30 and make sure your tuner is watching for knock no matter what turbo you get.
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Old 10-30-2008, 03:48 PM   #18
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Quote:
Originally Posted by mywifesSTi View Post
I had my sti tuned recently. My #'s were 295whp. I was a little dissappointed with the top end power. The car feels like its got nothing after 5500. My tuner said he had trouble getting the car to hold boost & to check for an exhaust leak. After investigation I found I was missing a stud on the dp and plenty of soot. I scheduled another road tune. With the leak fixed will I see a gain in whp? Or can I do something like a cai before the road to gain a little more top end?
My mods are:
maddad unequal length headers & up pipe
maddad catted dp
maddad 3" whisper cb
K & N Typhoon Intake
walbro 255 fuel pump
ap V2
Get rid of the headers, get rid of the catts, get a mbc. Check for leaks, get tuned, you'll be much happier with the results.
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Old 10-30-2008, 04:00 PM   #19
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Quote:
Originally Posted by STi Mikey View Post
Get rid of the headers, get rid of the catts, get a mbc. Check for leaks, get tuned, you'll be much happier with the results.

Why get rid of the headers, they will only HELP his midrange and top end?
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Old 10-30-2008, 04:13 PM   #20
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Quote:
07 sti which those glass pistons could be the issue--but 295 is not that bad
Glass pistons? Wha? I thought the motor in the 04-07 STI is the same with the 07 having "better" heads and the VF-43. What is the difference between the pistons?

To the OP, like already said, those numbers might not be low depending on what a baseline STI does on that dyno. I cannot see a chart if you posted one because I'm at work, but what kind of torque did you make?

Also, I'd recommend picking up a Hallman Pro MBC for when you go in for the fixed tune. I would think that will help hold boost better than the factory 2-port solenoid.

If you really want to get the most out of your stock turbo, have an exhaust shop fab an EWG mount onto your uppipe and just route it back into the downpipe to keep it "sleeper". I'm not sure if the MadDad uppipe has a flex section but that would be a good idea too if you plumb it back into the downpipe.

Can't wait to see the results, I have an 07 STI also and have yet to get it pro-tuned. I have a few more parts to pick up.
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Old 10-30-2008, 04:30 PM   #21
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top end? isn't it the turbo that is holding us back top end?
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Old 10-30-2008, 04:42 PM   #22
mywifesSTi
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Default

Quote:
Originally Posted by oldmansan View Post
Get a real tune (dyno). How do you know what your car put down with a road tune? When you get a real tune, be sure to post as to what type of dyno and smoothing for comparison purposes. Regardless, your numbers aren't bad, but you definately have room for improvement.

San
It was dyno tuned. The tuner said he could take me out for a road tune to see how I drive it and maybe get some more power out of it.
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Old 10-30-2008, 04:52 PM   #23
mywifesSTi
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Originally Posted by Steve.804 View Post
Glass pistons? Wha? I thought the motor in the 04-07 STI is the same with the 07 having "better" heads and the VF-43. What is the difference between the pistons?

To the OP, like already said, those numbers might not be low depending on what a baseline STI does on that dyno. I cannot see a chart if you posted one because I'm at work, but what kind of torque did you make?


Can't wait to see the results, I have an 07 STI also and have yet to get it pro-tuned. I have a few more parts to pick up.
I made 360wtq @3k. This was on a Dyno pak. The tuner has been very professional and I have nothing bad to say about him. Hopefully he can turn up the boost a liitle more than 19.3 when I go
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Old 10-30-2008, 05:51 PM   #24
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Quote:
Originally Posted by Audiosavvy View Post
Why get rid of the headers, they will only HELP his midrange and top end?
Honestly, it may seem crazy but the headers will not help on the stock snail.
On a dyno jet my car makes 390whp and 462wtq. Area under the curve is rediculous. My buddy CTracer makes 400whp and 480wtq, even more rediculous. This shows the stocker can be maxed out on the stock set up with no flow issues (considering a TBE has been installed).
There are 5 STi's in the united states on the stocker that trap between 115-116. I believe to the best of my knowledge not one has headers. Not positive of the science behind it, but the stock headers flow just fine.
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Old 10-30-2008, 07:02 PM   #25
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Quote:
Originally Posted by STi Mikey View Post
Honestly, it may seem crazy but the headers will not help on the stock snail.
On a dyno jet my car makes 390whp and 462wtq. Area under the curve is rediculous. My buddy CTracer makes 400whp and 480wtq, even more rediculous. This shows the stocker can be maxed out on the stock set up with no flow issues (considering a TBE has been installed).
There are 5 STi's in the united states on the stocker that trap between 115-116. I believe to the best of my knowledge not one has headers. Not positive of the science behind it, but the stock headers flow just fine.
Just because they are fine or make big power doesn't mean there isn't room for improvement. It is possible to gain power with aftermarket header even on the stock turbo, however it might not show up in peak power numbers. The reason I don't run them on my setup is because of the reliabily issue. BTW I trapped close to 111mph on my vf39 with a Dynamic Altitude of over 3K feet in my heavy ass LGT.
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