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Old 02-16-2009, 09:56 AM   #1
Tuned200
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Default What is the max boost for the VF48?

As it says, looking for solid #'s to figure out if my vf48 is being pushed. Im at 18 psi now and wanting more.
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Old 02-16-2009, 11:47 AM   #2
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What does your tuner say? Please don't say you are controlling it without engine management.
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Old 02-16-2009, 03:40 PM   #3
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More boost doesn't always = more power FYI.
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Old 02-16-2009, 11:17 PM   #4
Tuned200
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I understand this. I am protuned with supporting mods and ap. I was just asking if there is anymore room to add more psi? I was told it was cut off since my 4eat was about at the limit. basically if there is more room i wouldl ike to get a racegas tune.
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Old 02-16-2009, 11:25 PM   #5
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I think the vf48 will make hella boost if you weld the wastegate shut or the shaft twists in half.
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Old 02-17-2009, 02:02 AM   #6
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Yeah. Thanks for the words of wisdom.
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Old 02-17-2009, 07:49 AM   #7
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You can't add boost without tuning. Talk to your tuner as our words mean nothing without your tuner's advice.
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Old 02-17-2009, 08:44 AM   #8
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Quote:
Originally Posted by Unabomber View Post
You can't add boost without tuning.
Depends on how the map was originally tuned.

The VF48 on 93 should have another 3-4psi left in it if intercooling & fueling capacity are adequate.
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Old 02-17-2009, 08:52 AM   #9
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Quote:
Originally Posted by testes1010 View Post
Depends on how the map was originally tuned.

The VF48 on 93 should have another 3-4psi left in it if intercooling & fueling capacity are adequate.

This is the info im looking for. Lets assume I have pleanty of fuel and intercooler forthe job. I am happy with my 18psi tune for street and dd use. I would like a high boost map, as well as a low boost map. I will talk with my Jorge about my options as well. Im just gathering info.

Mr. Testes, you have a pm. I have questions about your set up as im looking to upgrade my lgt too.
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Old 02-17-2009, 09:31 AM   #10
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Quote:
Originally Posted by Tuned200 View Post
This is the info im looking for. Lets assume I have pleanty of fuel and intercooler forthe job. I am happy with my 18psi tune for street and dd use. I would like a high boost map, as well as a low boost map. I will talk with my Jorge about my options as well. Im just gathering info.

Mr. Testes, you have a pm. I have questions about your set up as im looking to upgrade my lgt too.
<<<<< Our turbos are pretty much identical. I have 40k miles on the car and between 4-5k are on the high boost map. 28psi yields only a few more whp than 23 psi, but in the midrange you get a crazy kick. Tuning and boost control is key, this will help determine how agressive you can go with timing.
On the high boost map I run the 28psi with 34-35 degrees of timing up top, and the car is reasonably quick for such a small turbo.
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Old 02-17-2009, 10:03 AM   #11
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STI Mikey- What engine management do you use?
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Old 02-17-2009, 10:13 AM   #12
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Quote:
Originally Posted by STi Mikey View Post
On the high boost map I run the 28psi with 34-35 degrees of timing up top, and the car is reasonably quick for such a small turbo.
Holy crap I run half of that!
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Old 02-17-2009, 10:31 AM   #13
STi Mikey
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Quote:
Originally Posted by WagonGGA View Post
STI Mikey- What engine management do you use?
I use Ecutek w/ easy ecu. When I first purchased the car, I only wanted to spend top dolar on quality EM. My 04 sti was a 23psi pump gas monster and had the ecutek, so i figured I would stay consistant.

If I could go back and do it again, I could make the same power + have more options (ffs & lc) with open ecu. It was 1100 with all of my software and two tunes. It could have been free if I used open

Nonetheless, the car is performing as well as healthy through 40k.
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Old 02-17-2009, 04:25 PM   #14
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Mikey, you have a pm. This info is what I was wondering and looking for. the max air a vf48 can push before maxing out.

thanks a lot

B
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Old 02-17-2009, 04:59 PM   #15
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I run my td04 up to 21-22psi in the midrange and it is quite entertaining
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