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Old 05-29-2012, 02:26 PM   #1
kylem1853
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Default stock sti intercooler good?

Im upgrading on my 06 to 850cc investors and a blouch 20g but my question is how much can the stock intercooler handle do i have to upgrade? Opinions?
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Old 05-29-2012, 03:00 PM   #2
kylem1853
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850cc injectors sorry
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Old 05-29-2012, 03:54 PM   #3
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Process west TM or Spearco TM.

Sorry. Pay to play. No reason not to do it right.
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Old 05-29-2012, 05:50 PM   #4
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There is no firm number, but I'd say that it can safely handle your turbo. The stock WRX on is good to 300, so the STI one is probably good to close to 400. Of course, the doom and gloomers will come out of the wood work saying that if you follow my advice the earth will explode, but there is no specific evidence either way for certain.
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Old 05-29-2012, 06:07 PM   #5
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Gonna have to check intake temps before and after to check. My vf39 and sti top mount cools well below ambient temps so I'm not upgrading any time soon
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Old 05-29-2012, 06:57 PM   #6
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Allot will depend on how the car is tuned as well.
You can make power with boost or with ignition timing. However typically you dont want to flow more then about 20-21psi of boost on that size of a turbo through the OEM TMIC. We did some testing a bit ago on a GRB STi w/ a 45lb turbo and after 20psi that is where the intercooler started having a hard time cooling down vs the rate of it heating up.

You can get away with running the STI TMIC, however it will be a restriction if you plan on making power by relying on boost pressure.

Kirill
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Old 05-29-2012, 08:03 PM   #7
kylem1853
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Thank you guys very much now last question if i stayed stock intercooler and got tuned and later wanted to upgrade just top mount would i have to retune?
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Old 05-29-2012, 08:04 PM   #8
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That is i mean with the 20g and 850's that would already be on it
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Old 05-29-2012, 10:09 PM   #9
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yes and no. to see the "gains" from it i would do it.
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Old 05-29-2012, 10:12 PM   #10
kylem1853
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Ok gotcha Thanos i understand
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Old 05-29-2012, 10:12 PM   #11
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Thanks
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Old 05-29-2012, 10:20 PM   #12
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Seems a lot of people make good power with them.However I was reading not to long ago on here how with higher boost the press fit end tanks start to come off.

post 36 is where it gets interesting.
http://forums.nasioc.com/forums/show...2348764&page=2
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Old 05-30-2012, 12:03 AM   #13
wrxstage2
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Stock tmic beats out the process west theres a test on nasioc check it out. Ive run 22lbs on my vf 48 just make sure it doesnt start to pull apart on u as they due when u hit large amounts of boost 25psi and up
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Old 05-30-2012, 04:35 AM   #14
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Quote:
Originally Posted by wrxstage2
Stock tmic beats out the process west theres a test on nasioc check it out. Ive run 22lbs on my vf 48 just make sure it doesnt start to pull apart on u as they due when u hit large amounts of boost 25psi and up
Process West doesn't have that problem lol, that test is BS. There are plenty of people out there that know that.
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Old 05-30-2012, 08:45 AM   #15
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Stock intercooler is a fin and tube construction.
Aftermarket is a bar and plate, because if they would give you fin and tube, the prices would be through the roof.
In the past there were two offerings of fin and tube, one was from PW, the otherone was from an expensive JDM manufacturer, possibly ARC.

They were very expensive and there is a thread, where the the size of that intercooler did not justify and upgrade over the Sti one (PW had initially built a moderate size fin and tube TMIC with larger diameter tunes from what I recall)

There was a TMIC compare in a magazine, back in '04, I think. Once you get into the "ebay-size" intercooler, the results start to diminish.

The bar and plate design has a low backpressure/pressure drop design, so the air charge follows prefferential pathways through the intercooler, not all of it's surface is used uniformly.

With the large size ones, the problem is that the charge just passes through not exhanging much of it's heat. Then people do the "palm-test", (it's cold to the touch) and conclude that it's a great intercooler.

The PW spaces the inlets more, to address this, but then instead of giving you an aluminum conduit to connect those, gives you a silicone pipe. It won't leak, but it will inflate under boost.

These are reasons for which the stock, especially GRB style intercooler is a good unit. It will get hotter to the touch, this is why the charge will get colder to the touch, if you could touch it.

The magazine test also concluded that the stock TMIC was a good unit.

But, in tose days, people were having as a goal 300WHP and upto those levels, it was fine.

The GRB should be fine a bit further, then, like Rallysport posted, it will become a restriction.

I can see how once you exceed normal boost, you could start to have problems with the crimping, but I doubt it's a problem at around 20 PSI. It has not been for me at least.

Another way of going about it would be to get a bar and plate with high bar density, that slows the flow down a bit and allows it to exchange some heat and to travel all the pathways more uniformly..
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