Did everyone forget about the front mount?
#31
Evolved Member
Join Date: Sep 2002
Location: Minneapolis
Posts: 942
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by BoxerSTi
I couldn't agree more about the TMIC soak heat, but there is also advantage to it, it made possiable to have short piping from turbo to IC to engine, the shorter it is, the better it is.
I couldn't agree more about the TMIC soak heat, but there is also advantage to it, it made possiable to have short piping from turbo to IC to engine, the shorter it is, the better it is.
The TMIC IC that Subaru fits on the WRX is fine for that car. But everyone I know who has modded their WRXs (which are common as hell in Minneapolis) to the point of swapping turbos has switched to a FMIC which is a pain in the *** on the WRX.
#32
Evolved Member
iTrader: (2)
Join Date: Oct 2001
Location: Houston, TX (NW)
Posts: 713
Likes: 0
Received 0 Likes
on
0 Posts
I believe that the EVO's whole airflow design is better for several reasons.
#1 On the STI the air going into the top mount has to compete with the air going in through the front, and thus all that air has to work its way down and under the car to exit. Since exactly as much air exits the car as enters it, there isn't probably much going in as the path for the air doesnt allow a lot going out.
#2 The ram air hood scoop is causing drag on the car, which is going to have some counter affect to the cooling bonus of the intercooler. Significant or not, its there, and will really show at high speeds, where the cooling benefit will not increase as fast as the drag deficit.
On the EVO the design with the intercooler in front of the radiator is a little better. Granted the radiator is not getting as much benefit mostly because the air is slightly warmer thus the delta T is smaller so not as much heat transfer.
The real benefit is that the vents in the hood allow a nice air pattern. One is that is allows air a nice path to escape which allows more air coming into the bay. Also that air is drawn across the engine removing heat which means that the radiator does not have to do so much work.
There will be some drag due to it, but it would be signifiantly less than a ram air scoop, and it will allow more air flow at higher speeds and the deficit of drag wont be increasing so much faster than the benefits are.
The STI intercooler is better for insurance rates though, which are heavily influenced by on damage in low speed crashes.
#1 On the STI the air going into the top mount has to compete with the air going in through the front, and thus all that air has to work its way down and under the car to exit. Since exactly as much air exits the car as enters it, there isn't probably much going in as the path for the air doesnt allow a lot going out.
#2 The ram air hood scoop is causing drag on the car, which is going to have some counter affect to the cooling bonus of the intercooler. Significant or not, its there, and will really show at high speeds, where the cooling benefit will not increase as fast as the drag deficit.
On the EVO the design with the intercooler in front of the radiator is a little better. Granted the radiator is not getting as much benefit mostly because the air is slightly warmer thus the delta T is smaller so not as much heat transfer.
The real benefit is that the vents in the hood allow a nice air pattern. One is that is allows air a nice path to escape which allows more air coming into the bay. Also that air is drawn across the engine removing heat which means that the radiator does not have to do so much work.
There will be some drag due to it, but it would be signifiantly less than a ram air scoop, and it will allow more air flow at higher speeds and the deficit of drag wont be increasing so much faster than the benefits are.
The STI intercooler is better for insurance rates though, which are heavily influenced by on damage in low speed crashes.
#33
Originally posted by favre95
YES!!! I have seen the FMIC on the WRC car many many times! Yes I know how it is designed. I probably have 30 pictures of it up on my peg board. You realy can't see the FMIC because it is built at a a slight angle, it is built into a duct area on the front of the car. But please...Don't tell me what I do and don't know, you don't know me. Also watch who you are calling a tool too. I am much older than you think, not some 16 or 17 year old punk kid getting mommy and daddy involved in buying my evo.
Despite what you think..heat is still going to have a natural form of travel despite the car moving or not. It is just the way things are. If you are so smart tell me why subaru has not put this into production!!! the FMIC that is. But please show a little class before you go off and start name calling and make yourself look like the bigger fool in the end...as you say this is a automobile enthusiast site!
YES!!! I have seen the FMIC on the WRC car many many times! Yes I know how it is designed. I probably have 30 pictures of it up on my peg board. You realy can't see the FMIC because it is built at a a slight angle, it is built into a duct area on the front of the car. But please...Don't tell me what I do and don't know, you don't know me. Also watch who you are calling a tool too. I am much older than you think, not some 16 or 17 year old punk kid getting mommy and daddy involved in buying my evo.
Despite what you think..heat is still going to have a natural form of travel despite the car moving or not. It is just the way things are. If you are so smart tell me why subaru has not put this into production!!! the FMIC that is. But please show a little class before you go off and start name calling and make yourself look like the bigger fool in the end...as you say this is a automobile enthusiast site!
Last edited by codemunky; Jan 12, 2003 at 02:01 PM.
#34
TMIC
limited in size
shorter piping (less turbo lag)
scoop (more drag)
no radiator blocking
(5MPH bumper)better reinforcement front bumper beam
soaking heat
no IC weight in front bumper (better F/R)
FMIC
At big as you can fit in your front bumper
longer piping (heavier and more lag)
no scoop at all
blocking radiatior
2.5MPH bumper
no soaking
heavier in front nose
The is all I can think of so far, let me know if you guys wanna add anything.
limited in size
shorter piping (less turbo lag)
scoop (more drag)
no radiator blocking
(5MPH bumper)better reinforcement front bumper beam
soaking heat
no IC weight in front bumper (better F/R)
FMIC
At big as you can fit in your front bumper
longer piping (heavier and more lag)
no scoop at all
blocking radiatior
2.5MPH bumper
no soaking
heavier in front nose
The is all I can think of so far, let me know if you guys wanna add anything.
Last edited by BoxerSTi; Jan 12, 2003 at 02:28 PM.
#35
Set modding on side, please.
STi - TMIC, less weight
EVO - FMIC, extra reinforcements in front to pass homologation
When you start to mod everything is possible. Try to fit DCCD and front SureTrack to EVO when you'll add FMIC to STi.
So in short both are different but good in stock flavor.
STi - TMIC, less weight
EVO - FMIC, extra reinforcements in front to pass homologation
When you start to mod everything is possible. Try to fit DCCD and front SureTrack to EVO when you'll add FMIC to STi.
So in short both are different but good in stock flavor.
#36
Evolving Member
Join Date: Oct 2002
Location: Kansas City, MO
Posts: 122
Likes: 0
Received 0 Likes
on
0 Posts
It's a company outlook problem. The Evo's have always had FMIC because it's what they deem most efficient for performance. Subaru has always leaned more towards every-day usability, though. And FMIC's run the risk of taking damage from thrown rocks and other such things. So if a TMIC works well enough, why run the risk?
Is it possible they stuck with it because of the boxer engine? Something about it that need's a TMIC with stock setup?
Oh, but for those of you touting Evo superiority over the STi, let me remind you.... 2.0 inline, vs. a 2.5 boxer. Sorry guys, no substitute for displacement. You start saying an Evo is faster because of intercooler placement, you sound like a bunch of Honda tuners.
Is it possible they stuck with it because of the boxer engine? Something about it that need's a TMIC with stock setup?
Oh, but for those of you touting Evo superiority over the STi, let me remind you.... 2.0 inline, vs. a 2.5 boxer. Sorry guys, no substitute for displacement. You start saying an Evo is faster because of intercooler placement, you sound like a bunch of Honda tuners.
#37
Subaru's
TMIC heat soak.
Boxter engine require long mainfold plumbing to the turbos. You want the turbos to be hot while running and the long pumbing creates a higher pressure drop for the turbo to work. With this setup and the precat due to emission of long plumbing = very high turbo lag.
In general shorter plumbing for TMIC Yes for subaru but, the long exhaust mainfold makes it worst.
Our mainfold comes directly out of the engine to turbo and many people wrap the headers to hold heat for the turbos. With our twin scroll setup we probalby have less lag. However the extra 500cc really throws it off.
Edit: Oh yeah, upipe is a must and a pain to change. Just want to point out the obvious.
TMIC heat soak.
Boxter engine require long mainfold plumbing to the turbos. You want the turbos to be hot while running and the long pumbing creates a higher pressure drop for the turbo to work. With this setup and the precat due to emission of long plumbing = very high turbo lag.
In general shorter plumbing for TMIC Yes for subaru but, the long exhaust mainfold makes it worst.
Our mainfold comes directly out of the engine to turbo and many people wrap the headers to hold heat for the turbos. With our twin scroll setup we probalby have less lag. However the extra 500cc really throws it off.
Edit: Oh yeah, upipe is a must and a pain to change. Just want to point out the obvious.
Last edited by gtr; Jan 12, 2003 at 09:45 PM.
#38
EvoM Staff Alumni
iTrader: (15)
Join Date: Apr 2002
Location: Wisconsin
Posts: 2,464
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Tuxedo Cartman
Oh, but for those of you touting Evo superiority over the STi, let me remind you.... 2.0 inline, vs. a 2.5 boxer. Sorry guys, no substitute for displacement. You start saying an Evo is faster because of intercooler placement, you sound like a bunch of Honda tuners.
Oh, but for those of you touting Evo superiority over the STi, let me remind you.... 2.0 inline, vs. a 2.5 boxer. Sorry guys, no substitute for displacement. You start saying an Evo is faster because of intercooler placement, you sound like a bunch of Honda tuners.
#40
Originally posted by Fireball
Huh? What?? Do you forget that either of these cars will beat out a V8 engine car pretty much any day of the week? There's LOTS of subsitutes for displacement. Displacement just adds weight and rotating mass, not to mention more wear and tear.
Huh? What?? Do you forget that either of these cars will beat out a V8 engine car pretty much any day of the week? There's LOTS of subsitutes for displacement. Displacement just adds weight and rotating mass, not to mention more wear and tear.
Last edited by BoxerSTi; Jan 12, 2003 at 10:22 PM.
#42
Evolved Member
Join Date: Jan 2002
Location: roseville, ca
Posts: 554
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Longfury
there used to be no replacement for diplacement...but forced induction replaced it
there used to be no replacement for diplacement...but forced induction replaced it
#43
I'm sure they've done years of research for the testing of 2.5L Turbo. wait, did i say that right, or should have i taken Hucked On Phawneks? muahahaha...
C'mon talEvons...be happy with the Evo for what it is...
C'mon talEvons...be happy with the Evo for what it is...
Last edited by codemunky; Jan 12, 2003 at 10:33 PM.
#45
Evolving Member
Join Date: Dec 2002
Location: NorthWest Ga
Posts: 466
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by codemunky
I'm sure they've done years of research for the testing of 2.5L Turbo.
C'mon talEvons...be happy with the Evo for what it is...
I'm sure they've done years of research for the testing of 2.5L Turbo.
C'mon talEvons...be happy with the Evo for what it is...