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Old 09-02-2019, 09:29 PM   #1
09slowrex
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Default Garrett top mount

Anyone running a Garrett top Mount ic on your car yet??? How does it perform??? The price is very attractive when compared to other tmic kits out there.
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Old 09-02-2019, 10:58 PM   #2
dpetro1
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No personal experience but I can't see how it would be anything other than quality.

I already had the grimmspeed tmic before the Garrett was released, otherwise I would have grabbed one.
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Old 09-03-2019, 02:16 AM   #3
noobultimatum
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Looks solid and garrett tends to make solid stuff period. My GS TMIC is doing just fine so i dont intend to change it out anytime soon.
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Old 09-03-2019, 10:53 AM   #4
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Really good price. I wonder if that will drive the other down a bit.
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Old 09-03-2019, 01:12 PM   #5
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I'm sure it's high quality. It appears similar in design and size to the TurboXS tmic, but with a higher quality core like the Grimmspeed unit.

A few notable differences compared to the Grimmspeed unit:
  • Obviously, the Garrett unit is ~$200 less. It's comparably priced to the lower quality TurboXS unit.
  • The Garrett unit is "direct fit" and retains the factory engine cover for its ducting which gives it a more OEM appearance (like TurboXS). Grimmspeed includes the splitter for improved airflow/cooling. Their splitter allows for the airflow to be distributed over more of the tmic's surface area (the stock duct isn't as wide).
  • The Garret unit retains the stock outlet location to the throttle body (like TurboXS). The Grimmspeed unit extends the outlet so that a straight coupler can be used instead of the factory curved unit. This makes for a bit easier of an install and will probably be more reliable at higher power/pressure levels.
  • The Garrett core is a bit larger in volume, mostly due to its thicker core.
  • Garrett: 13" x 10.2" x 4" (530.4 ci)
  • Grimmspeed: 13.1" x 10" x 3.75" (491.25 ci)
Otherwise, both the Grimmspeed & Garrett intercoolers use a bar & plate construction with high density cores (offset fins) and cast aluminum end tanks. They are worlds better than the TurboXS intercooler.

The Garrett tmic may be a bit harder to install due to its larger core. I worry that it could run into issues rubbing the slave cylinder since its core is 0.25" thicker and yet has to to sit lower than the Grimmspeed unit since it retains the OEM engine cover.

I personally think that the Grimmspeed unit is worth the extra $200 for the engineering and support that they provide to the Subaru community. For an average driver, there probably won't be a significant performance difference given their similar design. A FMIC will be better suited for the more hardcore builds.

If you're on a budget, it'll certainly be a better alternative to the TurboXS TMIC given the similar cost.

Garrett:




TurboXS:


Grimmspeed:



Last edited by WRXnick16; 09-03-2019 at 01:22 PM.
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Old 09-03-2019, 03:35 PM   #6
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Itís an interesting addition to the market. Iíd like to think they know a few things about designing and building an IC.
That said theyíve fallen on the same marketing bs about preventing heatsoak better than OEM other season do, which is demostratably BS. Nothing recovers as fast as the OEM tube and fin core between high load events. Yes their thermal mass does mean they heat up slower but thatís not useful much beyond the first cycle unless you have a bit of time between them.

*this is all in reference to road course use
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Old 09-03-2019, 11:24 PM   #7
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Thank you guys. I'll order it soon, I'll let you guys know how it sits and fits. Really don't want to go fmic as a bud of my had a fmic from a reputable company and got into an accident that he was not at fault. Now he is jumping through hoops of what the insurance will cover due to the "structural ridgidity" of the car was "compromised". It could end up costing him a bit. I don't want to deal with that.
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Old 09-04-2019, 12:38 AM   #8
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Quote:
Originally Posted by 09slowrex View Post
Thank you guys. I'll order it soon, I'll let you guys know how it sits and fits. Really don't want to go fmic as a bud of my had a fmic from a reputable company and got into an accident that he was not at fault. Now he is jumping through hoops of what the insurance will cover due to the "structural ridgidity" of the car was "compromised". It could end up costing him a bit. I don't want to deal with that.
Bingo
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Old 09-09-2019, 10:59 PM   #9
09slowrex
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Ordered from PLM. Private label manufacturing. Should be here soon.

I got it on sale for 599.95 shipped.

I am not going for all out power. Tgv and egr delete to follow along with a tune and call it done. Braking and suspension is where I'm concentrating my funds/time.
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Old 10-02-2019, 12:49 PM   #10
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Iíve had it sitting for over a month, been waiting to install. Iím going to see my tuner on Oct. 11th, Iíll ask him how the intercooler compares to the Grimmspeed and try and post some data as well.
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Old 10-10-2019, 12:39 AM   #11
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Quote:
Originally Posted by Afactor1234 View Post
Iíve had it sitting for over a month, been waiting to install. Iím going to see my tuner on Oct. 11th, Iíll ask him how the intercooler compares to the Grimmspeed and try and post some data as well.
My intercooler arrived 2 weeks ago. Pretty busy with work to have time to put it on the car. It is an impressive unit. Want to get a whole day and do some pulls with the car with the stock IC, then switch and do some pulls with it and log after. Compare logs for the guys to have something to go on.

Problem is, it will be hard to have a fair comparison as the weather these days in New Hampshire rises and falls so quickly.
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Old 10-10-2019, 12:53 AM   #12
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Quote:
Originally Posted by 09slowrex View Post
My intercooler arrived 2 weeks ago. Pretty busy with work to have time to put it on the car. It is an impressive unit. Want to get a whole day and do some pulls with the car with the stock IC, then switch and do some pulls with it and log after. Compare logs for the guys to have something to go on.

Problem is, it will be hard to have a fair comparison as the weather these days in New Hampshire rises and falls so quickly.
Even without the same conditions, logs will help to see if this is actually a viable top mount option. Excited to see those logs!
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Old 10-10-2019, 01:08 AM   #13
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I don't think there's any question it'll be an upgrade to the stock unit, it'd be nice to see it compared with the GS, KB, and PW units. But all data helps.
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Old 10-14-2019, 02:19 AM   #14
Afactor1234
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I talked to my Tuner Travis from snail performance and he had nothing but great things to say about this intercooler. Supposedly he had some input with Garret when they were in the designing phase and he told them some of the criteria they needed to hit of they were to go though with the intercooler. Iíll try and get some logs for you guys but so far from what I can tell the things a beast. my intake temps are never more than max 10 degrees above ambient while Iím cruising on the highway and when Iím in boost the the manifold temps drop to to Around 2-3 degrees above ambient.

Every weekend I drive up to the mountains from the Bay Area which is around 188 miles give or take. I popped my hood and the damn intercooler was freezing cold to the touch.
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Old 10-15-2019, 03:50 PM   #15
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Quote:
Originally Posted by Afactor1234 View Post
I talked to my Tuner Travis from snail performance and he had nothing but great things to say about this intercooler. Supposedly he had some input with Garret when they were in the designing phase and he told them some of the criteria they needed to hit of they were to go though with the intercooler. Iíll try and get some logs for you guys but so far from what I can tell the things a beast. my intake temps are never more than max 10 degrees above ambient while Iím cruising on the highway and when Iím in boost the the manifold temps drop to to Around 2-3 degrees above ambient.

Every weekend I drive up to the mountains from the Bay Area which is around 188 miles give or take. I popped my hood and the damn intercooler was freezing cold to the touch.

Highway cruising and half pulls arenít very useful.

A third gear pull would be good. If youíve got a safe place fourth is even better.

A quarter mile pass would be good too.
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Old 10-15-2019, 04:07 PM   #16
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Quote:
Originally Posted by uofime View Post
Highway cruising and half pulls arenít very useful.

A third gear pull would be good. If youíve got a safe place fourth is even better.

A quarter mile pass would be good too.
That post sounded like a piece of Garret propaganda lol.

Intercoolers have zero effect on intake temperature, so that's irrelevant, be nice to see manifold temps after more than one pull.

IC cold to the touch after a 200 mile drive? Either it was cold in the mountains (making it not a big deal) or someone's really trying to justify their purchase.
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Old 10-15-2019, 05:00 PM   #17
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Quote:
Originally Posted by GlarryHoodDIT View Post
Intercoolers have zero effect on intake temperature, so that's irrelevant, be nice to see manifold temps after more than one pull.
This.

Manifold temperature during subsequent, back-to-back runs. Simulating a drag strip run (with staging) or accelerating from stop & go traffic to see how quickly the intercooler recovers from heating up while stopped would also be interesting.
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Old 10-16-2019, 01:22 PM   #18
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I found this on garrett's website. (take it with a grain of salt obviously but at least Garrett is a reputable company)

Multiple back-to-back dyno pulls in a wind tunnel to simulate real world driving conditions.
**Air velocity is synchronized with vehicle speed**
30 įF intake manifold temperature reduction







https://www.garrettmotion.com/racing...l-intercooler/

https://www.garrettmotion.com/wp-con...Training-1.pdf

based on the instructions it looks like a little bit of trimming of the factory engine cover to lower it so it sits closer to the intercooler is an optional step.

Last edited by IndecisiveS12; 10-16-2019 at 08:08 PM.
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Old 10-16-2019, 04:27 PM   #19
WRXnick16
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Interesting, thanks for sharing!

I find those power gains a bit hard to believe.

But the horsepower & torque graphs by the # of runs is interesting and more of what I would expect. The OEM tube & fin intercooler will recover more quickly in between runs whereas the Garrett unit has more thermal mass and cannot recover as easily once it reaches the point of heat saturation. I wonder why they stopped the OEM tmic at 11 runs, but kept going with the Garrett. Maybe the OEM tmic surpasses the Garrett unit at that point.
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Old 10-16-2019, 07:15 PM   #20
Afactor1234
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Youíll have to excuse my typos in my previous post.
What I meant was that my intake manifold temps seem to stay at max 10 degrees above ambient temperatures while driving normally and not under boost. The second I enter boost and while making a pull, the manifold temperatures drop and seem to hover around 2-3 degrees above ambient for the duration of that pull.

As for the cold intercooler after driving 180 miles, it was around 56 degrees out for a good portion of the drive. The side of the intercooler that connects to the charge pipe was warm to the touch and the side that connects to the manifold was freezing cold. Wasnít trying to prove a point just stating my initial impressions of the intercooler before I find time to do some logs
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Old 10-16-2019, 08:15 PM   #21
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Quote:
Originally Posted by WRXnick16 View Post
Interesting, thanks for sharing!

I find those power gains a bit hard to believe.

But the horsepower & torque graphs by the # of runs is interesting and more of what I would expect. The OEM tube & fin intercooler will recover more quickly in between runs whereas the Garrett unit has more thermal mass and cannot recover as easily once it reaches the point of heat saturation. I wonder why they stopped the OEM tmic at 11 runs, but kept going with the Garrett. Maybe the OEM tmic surpasses the Garrett unit at that point.
When I found this i was 5 minutes from going into a meeting so I didn't look too closely but dang that dropoff in power/torque after subsequent runs is really disheartening.
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Old 10-16-2019, 08:45 PM   #22
Afactor1234
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Here are some photos of the TMIC installed for anyone wondering.
https://photos.app.goo.gl/cEnp3Btu2i8KGyUe7
https://photos.app.goo.gl/ggvZRDmoXwJdmTyX8
https://photos.app.goo.gl/RZE6FcGfRMx3z9gR6

Another side note is that the instructions optionally call for some modification to the engine cover. Ill attach a picture of the instructions here https://photos.app.goo.gl/ozGoBzvhQNKc9a826

It says to chop off the little teeth so that the cover sits lower on the intercooler which reduces air passing around it via the holes in the teeth. here is a photo after I cut the teeth out.
https://photos.app.goo.gl/gr1cZMk2bZMqxKuL9
https://photos.app.goo.gl/EVaDNn5yp1tfLrw37

Afterwards I decided to add some new foam to the part where I chopped to seal to the intercooler and protect it from the sharpish plastic from messing the fins up
https://photos.app.goo.gl/6Lj9TCT2UNkp14WDA
https://photos.app.goo.gl/XibKnSmVQGBCFFrq8

Here's a photo of how it sits on the intercooler(taken before i applied the new foam)
https://photos.app.goo.gl/Lst154dyo3ufb9UD9

I will try and take some logs tonight and post them.
Let me know if you guys want any more pictures or information and ill try my best (also let me know if the links to the pictures work)

- Aaron
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Old 10-17-2019, 01:30 AM   #23
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https://www.dropbox.com/s/3b7s83cal5...alog4.csv?dl=0

https://www.dropbox.com/s/mekbmdygha...alog5.csv?dl=0

Here are 2 data logs. sorry I wasn't able to get more. These 2 pulls where after 3 other attempts (I need to find a better spot to log.) They are both in 4th gear. The car had been completely warmed up prior to all logs.
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Old 10-17-2019, 10:31 AM   #24
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Quote:
Originally Posted by Afactor1234 View Post
https://www.dropbox.com/s/3b7s83cal5...alog4.csv?dl=0

https://www.dropbox.com/s/mekbmdygha...alog5.csv?dl=0

Here are 2 data logs. sorry I wasn't able to get more. These 2 pulls where after 3 other attempts (I need to find a better spot to log.) They are both in 4th gear. The car had been completely warmed up prior to all logs.
You're going to need to log boost and rev it out to at least 6k...
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Old 10-17-2019, 11:25 AM   #25
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Quote:
Originally Posted by adam99 View Post
You're going to need to log boost and rev it out to at least 6k...
I know like I said I need to find a better place to log... streets by my house arenít long enough. Iíll re-upload the logs but with boost for you later today in the meantime
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