I have spent some time on the IC piping from turbo to FMIC. I think I will have to stick with 2.75" for the most part do to clearances. The 2.75" is tight as is. There would not be an issue with performance because the 2.75" will flow plenty of air for any non sleeved block out there.


2.75" cross sectional area of 5.93" square
2 x 2.0" piping cross sectional area is 6.28" square

That is only a 6% difference.

I think the we are good here, because the twin turbo kits using 2" diameter tubing (from turbo to FMIC) have gone very deep in to the triple digits when it comes to whp.






I have also been working on some other stuff, requiring me to remove my headers. This is a whole different thing though.

 

This is going to be interesting when we route my i/c piping... I may be going sleeved!?!
You gotta text me that exa pricing info man!

 

I will put it together today.

Even sleeved, the piping is large enough. Look at the twin 67mm kit at Dynosty, it is using 2" piping from each turbo to feed the FMIC.

 

^doesnt meant AITs are ideal though....

 

I am talking about turbo to FMIC. The OEM TB is 2.75" anyway so anything larger won't get one any more air to the engine.

The $1500+ HKS/Greddy FMIC kits use 2.5" piping turbo to FMIC, and they don't seem to have issues.

 

You guys haven't experienced any ground clearance issues? Like taking it on a road course or any kind of drifting, Speed bumps, driveways ETC. Looks pretty sick though! Interesting how the Ic piping and charge pipes are ran!

 

The turbo sits above the skid plates, and there have not been any issues reported by any BP kit owner.

 

remember, i do own the same SFR kit with 2" charge pipes with a big IC...

so not just speaking in generalities.

 

What is your IC core size?

 

core like 9 x4.5 x 28 vertical
but thats with 2 turbos with smaller turbine housings. I do remember all the math you post a while back about minimum charge pipe sizes per CFM, and 2" is way to small according to those charts.

i dont think i can go any bigger charge pipe though, just no space.

i think thats why rear mount is best option for big turbo. room for 3" charge pipe, 5" intake, quick spool valve and T6 framed turbo.

 

For this 76mm build I was looking at a vertical flow core as well, but could not find one to fit my criteria. If was going vertical with this turbo, the core would have to be 12" tall. Something in the 24x12x4.0 range. That extra 3" of vetical flow would go a long way in keeping the charge temperatures down.


With the rear mount, you still have to get through to the front to an IC. It is just very difficult to get a 3" charge pipe all the way through the engine bay.

 

Not trying to ask troll question, but how would rear mount allow you for 3" charge pipe? You still have to run by the headers no?

Sasha have you considered doing a y'd charge pipe?

 

you run it thru the same place all the top mount kits run their downpipes. Of course you need a custom exhaust to align the turbo in the correct spot, but i'm sure you could do it easily.

coming from the back, you dont need to pass under the transmission again, like on BP's kit. Thats why he is stuck bc on passenger side, there isnt as much room. You run the up-pipe on the passenger side of the driveshaft and you run your 3" charge pipe on the drivers side. 5" intake where stock muffler used to be and as big a downpipe as you want to a tip out the back.

 

You are right about the 3" charge pipe, and having it run up where the top mount down pipe is. I am not restricted by this on the BP kit at all:



You can really see how much room I have here to route it that way:




The two exhausts configurations differ a bit, as these were taken during the original testing phase.



EDIT:

Just had a look at this, and I don't like it to be honest. The main reason I built this kit vs a top mount was clearance. I don't want to have a 3" IC pipe running there, having to run a different a/c line to allow for it. IMO the engine moves way too much to have anything 3" in that location, and not having rattling/clearance issues is my #1 goal.

I don't care how you build the down pipe (or IC pipe in this case) it will hit. The OEM headers alone (when bolted loosely to the heads) can move up/down about 1/2" at the flange. This means that the 1/2" at the header can translate to 3/4" or more at the down pipe, and things can be off enough to cause clearance issues.

I guess the aluminium IC pipe can be massaged easily to allow for better clearance, and since it is held together by silicone couplers there a bit of flexibility.

 

i run my 3" intake pipe thru that same spot with no issues and plenty of clearance. But i obviously dont have a crossover pipe there competing for space, just a turbo. Not sure why you think you'd need a new AC line. You just run the charge pipe under the sway right to the bottom of the intercooler.

like you said, 2.75" is pretty close and should be adequate as well. Which housing in the 76 getting again? Ported S or H?

 

I think we are talking about different locations here?

If you say your intake runs there then it is under the header, where top mount kits run the up-pipe. I am talking about the space between the engine and driver side wheel well, where the top mount kits run the down pipe.

In the latter of the two, there are too many hoses/ac lines to mess with IMO as the charge pipe would go over the sway bar. There just isn't enough room.

The 67mm+ turbos are only available with the H cover.

 

ya i meant up-pipe, under the header. you wouldnt run a charge pipe to the top of the motor to get to the intercooler.

the intake on my kit is a full 3" and runs under the headers to the front of the car. exact same way you'd run a 3" charge pipe from a mid/rear mount charge pipe to the intercooler.

Both charge pipes on the intercooler would be on the same side.


Having H as an option for the 62 and 67mm kits is awesome.

 

Ahh, that makes more sense because you initially said down pipe, hence the confusion. That is where I run my charge pipe now, and I could look in to the 3” but it would be a very tight fit. Pushing it through is where the problem would be.

Like I said, with the 76mm turbo I would want a 12” tall core for a vertical flow setup. With that, you run out of room because the inlet/outlet side would be 18”, and that is too tall. Maybe there is something reasonably priced out there, and I just have not found it. Bell could build one to fit, but it would be in the $1300 range.

 

ya having the endtanks on the top and botton add height quick. I have my BOV on the top of my IC so its as tall as I can go unless i relocate.

 

That's the thing...the standard core that I use is 9" tall, same as yours except that you are 4.5" thick and I use a 3.5" thick core:

25"x9"x3.5":





Easy to see how another 3" on to of that would make this almost impossible.