Just thought I'd share some info [as i understand it] on the ARC intercooler.

There are 3 types for the Evo:

1. 073
2. 079
3. 073 wide

From what I have been told, the 073 and 079 are pretty much stock size, perhaps a little bigger but not by much. All 3 are 70mm thick.

The 073 ad 073 wide are more conventional in that if you look at the cross-section going into the intercooer, the opening area (into the channels) is around 80%

The 079 has these opening tapered so that the opening the air sees is nearly 100%

073/073 wide:

hot air -> I::::::::::::::::::I
hot air -> I::::::::::::::::::I
hot air -> --------------------->cooled air
hot air -> --------------------->cooled air
hot air -> I::::::::::::::::::I
hot air -> I::::::::::::::::::I
hot air -> --------------------->cooled air
hot air -> --------------------->cooled air
hot air -> I::::::::::::::::::I
hot air -> I::::::::::::::::::I

079:

hot air -> /::::::::::::::::::\
hot air -> \::::::::::::::::::/
hot air -> --------------------->cooled air
hot air -> --------------------->cooled air
hot air -> /::::::::::::::::::\
hot air -> \::::::::::::::::::/
hot air -> --------------------->cooled air
hot air -> --------------------->cooled air
hot air -> /::::::::::::::::::\
hot air -> \::::::::::::::::::/

Well, sort of. The taper in the real one is probably a lot less steep.

The 073 wide is (obviously) 'wider' - meaning that it occupies a greater width across the bumper (from left to right). But the thickness is the same as the 073. The core itself is 660mm wide (~26").

Which one's better? I don't really know. Opinions are very welcome...


Lost myself a bit writing all this, but anyway, this is what I've been told. Any information/corrections are very much welcome. These I/C's are real expensive, but somehow, I can't seem to find a vendor who can/wants to answer questions about them. I mean everyone sells ARC intercoolers but heck they can't even tell me what type they have - thanks to gunzo for some great info.

 

both the 073 and 079 have the taper going into the intercooler.. the major difference is the 079 has more rows than 073..if I still remember correctly its 22 rows versus 16 rows

 

Ahh... perhaps that's what it is. Very sorry if I got it a little messed up. It's a combination between my Japanese and my Japanese friend's english!!!

So, the 079 has smaller channels? (I was told they are of the same height?)

 

The 073 and 079 has the same sized channels .. it's the gap between the bars of the intercooler that is smaller in gap so that they can squeeze more bars across the same sized intercooler ..

note also that standard bar and plate design intercoolers are just that .. bars and plate ..
ARC has tapers on the IN side of the intercooler (like you mentioned) and also on the front of the intercooler.. so that the air is channelled to the cooling fins instead of hitting a flat 90 degree bar before tumbling thru to the cooling fins like the standard intercoolers out there right now ..

 

So, I'd imagine that if the 079 has more channels (each of the same size as the 073) it should cause less pressure drop than the 073(?).

However, this comes as an expense of smaller gaps between the channels so perhaps it doesn't cool quite as well(?).

In any case, more channels = lower flow speed (given cfm) then the difference in cooling (point above) should be less significant.

P.s. I have edited my original post. The purpose of this thread is to ask for info - as you kindly provided - rather than just plainly stating facts. Thanks so far, dude.

 

uhm... i htink i need a better illustration... i totally don't know what you're talkin' about.

try filling the transfer tube areas with :::::::: or something.

 

wow...i didn't even know about these info i just read...when i ordered mine they said it was made for the evo and i took there word for it...if i knew there were some option den i would've selected something or ask which one is better...

 

ARC, in their infinite wisdom, has updated their website by replacing their old page (with decent illustrations) with a new one with no illustration at all. Now their website just has a table which says these models are available for the evo, just order one and cross your fingers.

Anyway, I have no idea if they have model numbers or not, but a 'wide' model should be easy to spot.

I've just made some alterations to the OP. If gunzo could check see if it's kinnda right, I'll appreciate it loads.

 

that's what hks did too

 

This is great info but would it be safe to assume that model 073 is closest to pressure drop as stock just better cooling?

 

I'm kindda hoping that the 079 would provide same cooling as stock with less pressure drop. Just ordered one without quite knowing how i'm going to pay for it...

 

073/073 wide:

hot air -> /::::::::::::::::::I
hot air -> \::::::::::::::::::I
hot air -> --------------------->cooled air
hot air -> --------------------->cooled air
hot air -> /::::::::::::::::::I
hot air -> \::::::::::::::::::I
hot air -> --------------------->cooled air
hot air -> --------------------->cooled air
hot air -> /::::::::::::::::::I
hot air -> \::::::::::::::::::I

079:

hot air -> <::::::::::::::::::
hot air -> --------------------->cooled air
hot air -> --------------------->cooled air
hot air -> <::::::::::::::::::
hot air -> --------------------->cooled air
hot air -> --------------------->cooled air
hot air -> <::::::::::::::::::
hot air -> --------------------->cooled air
hot air -> --------------------->cooled air
hot air -> <::::::::::::::::::
hot air -> --------------------->cooled air
hot air -> --------------------->cooled air
hot air -> <::::::::::::::::::


Hi .. its something more like this .. the 079 is a better intercooler than the 073 with probably less pressure drop and higher cooling capacity

The side profile is something like this


+------------+ front of intercooler
|.................>
|:::::::::::::| < -------incoming air
|.................>
|:::::::::::::| <-------incoming air
|.................>

 

cool. the word taper was used before, perhaps velocity stacks would have been more appropriate.

 

Does the stock piping fit this intercooler? If I don't get a tune for it, will there be any problem? Anyone?

 

I believe I have the 073 wide (takes up the whole VIII bumper opening), and mine can use stock piping. ARC sends you the FMIC and some l337 green ~4" straight couplers. Your stock FMIC uses 45* couplers for the inlet/outlet, the ARC core just connects to your stock U/L IC pipes using the supplied couplers.

Plus it's got a nifty tray welded to the bottom with holes for your undertray's POS plastic screws. It's "bolt-in" to the fullest extent of the phrase.