Author Topic: Front mount VS. Top mount the never ending question  (Read 337 times)

July 17, 2017, 11:17:20 AM
Read 337 times

Veneficus

  • Global Moderator
  • Hero Member

  • Offline
  • *****
  • Windg@t XT driver

  • 1994
    • View Profile
    • Email
Front mount VS. Top mount the never ending question

Ok now since I have seen this go around regularly I though lets put it on here as well
If a missed an old discussion then sorry :p

Now according to the info I have been able to pick up a top mount intercooler works quite well in a few places
The short pipe runs has positive effect on Turbo lag and works well with slightly smaller Turbo’s
It does not like max rev’s as much but it allows quicker spool ups and can still create quite a decent amount of power
As quoted
Quote
A top mount intercooler, or TMIC, has the least amount of turbo lag and is best used with smaller turbo chargers to create large amounts of low-end power. However, not as powerful as the FMIC at the top-end, it stands its ground being able to push upwards of 400 HP, while allowing full turbo spool in most turbo at or below 3000 RPM. I would recommend a TMIC with the IHI VF30 or VF34.

Front mount intercooler has the most direct cooling and proper air density.
But due to the longer pipe runs it takes longer to go into boost
As quoted
Quote
A front mount intercooler, or FMIC, has the best density charge and cooling capacity, however due to its length away from the turbo charger, will create more turbo lag (spooling time for the turbo) than a Top Mount. A FMIC is however required to achieve higher top-end boost as well as for the larger turbo chargers such as the IHI VF22. I would also recommend a FMIC for the IHI VF23, however it is not required. If you want more boost and power, yet lower end lag, go with the FMIC, if you want instant power, yet not as strong, please read the Top Mount Intercooler listed below.

http://www.wrxtuners.com/forums/showthread.php?s=&threadid=4007.

Other sites that states same thing
https://www.maperformance.com/pages/fmic-vs-tmic-which-one-is-right-for-you


For me personally the question whether you want to go for the Top mount unit
Or front mount depends greatly on what do you want to do with your Forester

For a daily runner with bit extra power I think the top one works fine

If you want to make the most amount of power then front all the way
« Last Edit: July 17, 2017, 11:33:19 AM by Veneficus »
2007 2.5XT Manual (and boy did I have to search for manual one)

July 17, 2017, 11:31:32 AM
Reply #1

Stev0

  • Administrator
  • Hero Member

  • Offline
  • *****

  • 10201
    • View Profile
    • Email
I still think a decent top mount with water injection is the way to go.

July 17, 2017, 11:46:02 AM
Reply #2

Veneficus

  • Global Moderator
  • Hero Member

  • Offline
  • *****
  • Windg@t XT driver

  • 1994
    • View Profile
    • Email
I agree with you on that one

I would rather spend money on that long before I spend money on moving the inter cooler to the front bumper.

That water injection would immediately nullify the relative increase you get from having the inter cooler on the front
While keeping the advantages and improving on that from having it at the top
« Last Edit: July 17, 2017, 11:54:25 AM by Veneficus »
2007 2.5XT Manual (and boy did I have to search for manual one)

July 17, 2017, 12:25:19 PM
Reply #3

Veneficus

  • Global Moderator
  • Hero Member

  • Offline
  • *****
  • Windg@t XT driver

  • 1994
    • View Profile
    • Email
2007 2.5XT Manual (and boy did I have to search for manual one)

July 17, 2017, 02:54:32 PM
Reply #4

FozzieDriver

  • Hero Member

  • Offline
  • *****
  • Blue Wasabi

  • 836
    • View Profile
    • Email
https://www.performanceproducts.co.za/forester-2003-2008/548-cool-boost-systems-vi2-wmi-kit-for-forester-2003-2008.html
I fitted this one.
Well worth every cent.
I run 1.4 bar on a VF48 TMIC (STI 08) and it is fun all the way to 6800
Failsafe is spot on.
And I also have octane on demand.
So when cruising down to Cape Town, hardly use any meffs
Forester XT 2008 MT
VF48, STi IC, 76mm Bell mouth TNT Free flow, GFB EBC, Coolboost WMI, WHP built and Chett Tuned. Blue Wasabi V3.0

July 26, 2017, 07:13:43 PM
Reply #5

westcoaster

  • Global Moderator
  • Hero Member

  • Offline
  • *****
  • Mud lover!

  • 1100
  • Personal Text
    Mud lover!
    • View Profile
    • Email
Current: S-edition 2011 Steel Silver (S-exy young thing) - Forged, Chett tjooned, 76mm s/s wrapped DP, King Springs, 225/60/17 G012s, Sump & AT guards, cheap mud flaps, HID fogs, LED parks.
Ex:        2.5X man 2010 Pearl White (Dirty Girl) - LSS lift, 235/60/16 G012s, Sump guard, HIDs and more..

July 26, 2017, 07:14:56 PM
Reply #6

westcoaster

  • Global Moderator
  • Hero Member

  • Offline
  • *****
  • Mud lover!

  • 1100
  • Personal Text
    Mud lover!
    • View Profile
    • Email
https://www.performanceproducts.co.za/forester-2003-2008/548-cool-boost-systems-vi2-wmi-kit-for-forester-2003-2008.html
I fitted this one.
Well worth every cent.
I run 1.4 bar on a VF48 TMIC (STI 08) and it is fun all the way to 6800
Failsafe is spot on.
And I also have octane on demand.
So when cruising down to Cape Town, hardly use any meffs

Tim's car hauls ass.  WMI seems to have enabled the potential of the engine to be used properly.
Current: S-edition 2011 Steel Silver (S-exy young thing) - Forged, Chett tjooned, 76mm s/s wrapped DP, King Springs, 225/60/17 G012s, Sump & AT guards, cheap mud flaps, HID fogs, LED parks.
Ex:        2.5X man 2010 Pearl White (Dirty Girl) - LSS lift, 235/60/16 G012s, Sump guard, HIDs and more..

August 19, 2017, 01:39:26 AM
Reply #7

Durbanboy

  • Full Member

  • Offline
  • ***

  • 196
    • View Profile
    • Email
2003 Xec AT
Decat, 57mm SS Cowley freeflow
220l p/h fuel pump
HUCO plug leads
KYB shocks

August 21, 2017, 12:41:57 PM
Reply #8

sav

  • Hero Member

  • Offline
  • *****

  • 1942
    • View Profile
2007 XT Premium Sportshift (Decat, VF48 @ 1.2 bar, STi TMIC, Chett tjooned, BBK, coilovers, etc etc eish!)

May the Forester be with you...

August 21, 2017, 12:48:44 PM
Reply #9

SniperHilton

  • Global Moderator
  • Sr. Member

  • Offline
  • *****
  • S-Edition Fozzie

  • 408
    • View Profile
    • Email
Put a bigger hood scoop on.


To achieve what exactly?


You've heard of the venturi effect right? You've also noticed the scoop design changed... ever wondered why?


And now explain to me, what a bigger scoop will do when you are stuck in Bumper to Bumper Traffic, as the smaller one creates a nice path for hot air to rise off the motor, through the TMIC and into the ATM, creating dreaded Heat soak.


2013 Forester S-Edition | Chett Tuned - 1.2BAR | TNT DumpPipe | Zorst

August 21, 2017, 02:28:45 PM
Reply #10

FozzieDriver

  • Hero Member

  • Offline
  • *****
  • Blue Wasabi

  • 836
    • View Profile
    • Email
Put a bigger hood scoop on.
I did. Made F-all difference.
Kept it anyway cause it looks cool.
Heat soak is the mother of all curses!
Forester XT 2008 MT
VF48, STi IC, 76mm Bell mouth TNT Free flow, GFB EBC, Coolboost WMI, WHP built and Chett Tuned. Blue Wasabi V3.0

August 21, 2017, 10:06:33 PM
Reply #11

berndp

  • Hero Member

  • Offline
  • *****

  • 1073
    • View Profile
    • Email
Saw a Datsun (Nissan, for the younger generation folks) champ bakkie recently where they seem to have solved this heat soak problem.

Removed the bonnet  ;D ;D

They must have also gained 1.73kW in the process due to less weight
Subaru Forester 2005 2.5 Xsel
Always looking for a tar free "road"
Brackenfell, W'Cape

August 30, 2017, 06:35:46 AM
Reply #12

Veneficus

  • Global Moderator
  • Hero Member

  • Offline
  • *****
  • Windg@t XT driver

  • 1994
    • View Profile
    • Email
Well you can always fit small bike radiator fans to the inter-cooler :p
Pushing down :D


Go to second hand bike place and buy one of these
« Last Edit: August 30, 2017, 06:45:58 AM by Veneficus »
2007 2.5XT Manual (and boy did I have to search for manual one)