('03-'05) Safe Maximum Psi for TD04 13t - Subaru Forester Owners Forum
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post #1 of 13 (permalink) Old 08-14-2012, 05:18 PM Thread Starter
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Safe Maximum Psi for TD04 13t

What is the safe psi range. I'm looking to increase psi by adjusting actuator.

The turbo I'm getting will also be completely rebuilt as well.
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post #2 of 13 (permalink) Old 08-14-2012, 05:21 PM
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Its not about where its "safe" its where its still efficient. 21ish max otherwise its just hot air

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post #3 of 13 (permalink) Old 08-14-2012, 05:55 PM Thread Starter
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Thank you. I was tho.king setting actuator at around 16-17
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post #4 of 13 (permalink) Old 08-14-2012, 06:18 PM
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i have to disagree. i would say like 18 psi is the max for the td04 before it turns into a hairdryer. you can't just increase boost by turning the wastegate actuator if thats what you mean...you need a professional tuner

Slowbaru Tuned VF43'd 2007 FXT Limited MT
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post #5 of 13 (permalink) Old 08-14-2012, 06:26 PM
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Connor is right. You should not turn up the boost mechanically, or you will damage your engine. I would argue that even getting the boost turned up by tuning is not a great idea. The TD04-13T compressor wheel is so small that even when it is within its efficiency range, the shaft is spinning so fast that sustained boost at high rpm will cause the turbo to fail very quickly. I had a Cobb stage 1 tune installed for about a year before my TD04 gave out.

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post #6 of 13 (permalink) Old 08-14-2012, 08:09 PM
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Listen to connor.


Do it.


Also if i might add... The TD04 wasnt meant to be pushed to extremes... your best bet is to save up and swap a VF series turbo, like the VF39 or VF43, or even the newer VF48s or 52s if you can find oen thats not too pricey. Out of the box, a tuner can get you some decent numbers with those turbos.

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post #7 of 13 (permalink) Old 08-15-2012, 09:32 AM
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Just go on ebay and buy a $10 manuel boost controller and turn it up to 20psi jk. But on a serious note get a tune or you will blow up your motor. I used to run 19psi on my td04but it isnt meant to run high boost thats why it will taper to 9psi at redline.
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post #8 of 13 (permalink) Old 08-15-2012, 09:54 AM
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It has a lot to do with the cfm ( measure of volume ) of the turbo . It's why one turbo at a certain psi creates more/less boost than a different turbo .

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post #9 of 13 (permalink) Old 08-20-2012, 10:37 AM
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so... i have a VF41 on my 2004 JDM FSTI running 15 psi with a manual boost controller.

Can i safely tune it up to 18psi with 92 octane fuel? best fuel here is 95 octane

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post #10 of 13 (permalink) Old 08-20-2012, 12:28 PM
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no

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post #11 of 13 (permalink) Old 08-20-2012, 01:35 PM
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+1 on the no get a tune
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post #12 of 13 (permalink) Old 08-20-2012, 03:20 PM
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Quote:
Originally Posted by kbn546j View Post
so... i have a VF41 on my 2004 JDM FSTI running 15 psi with a manual boost controller.

Can i safely tune it up to 18psi with 92 octane fuel? best fuel here is 95 octane
92 RON? I wouldn't run that low an octane even at 15psi.

Stan

Shocks > struts.
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post #13 of 13 (permalink) Old 09-06-2012, 11:49 AM
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+2 on the tune... getting one soon....

15 psi seems to be quite safe as there are many cars for many years that have run 15 psi without any issues.....

guess 18psi is too much....

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