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Old 01-04-2015, 05:03 PM   #1
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Is my intercooler creating a choke point?

I just finished installing my custom turbo kit; it's a Holset hx35. The kit was originally put together by another member on these forums. Hot side piping is 2.5", the intercooler has a 2" in/out and cold side is 3" running to the stock throttle body. The turbo is huge so full boost doesn't come on until almost 4700 rpms but is my intercooler creating a choke point because of its size compared to the hotside and coldside piping? Also, would upgrading to a larger throttle body help with restrictions for my set up? Let me know what you guys think


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Old 01-04-2015, 06:24 PM   #2
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Jeez, that thing is huge on a focus. That HX35 pulls my 8k pound truck pretty good, I couldnt imagine it on a 3k pound car.

As far as the question goes, I know my intercooler on my truck is HUGE. I dont know if its that big for the size of the turbos that go on there, or what, but the small one on a focus could cause issues, I think. Dont quote me on that.
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Old 01-04-2015, 06:35 PM   #3
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It all has to work together, like JFrye mentioned above man thats a pretty good size turbo. On a n/a dtech the t/b is noticeable off idle.
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Old 01-04-2015, 06:53 PM   #4
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As I said, I cant be of much help on here as I have never done a F/I focus, but that thing is huge. I have seen quite a few of the Mitsubishi guys running a HX35 on Talons/Eclipses, and on some Evos, so if you cant find an answer on here, maybe you can snoop around some of those forums to see what they are running. That might give you an idea of what to look for that will fit a focus, and go from there.
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Old 01-04-2015, 07:36 PM   #5
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I have no issues with 2 inch from the turbo to the IC and 2.5 from the IC to the TB

By doing 2 inch it helps to spool ever so slightly quicker , if your 3 inch from the IC to the TB you could gain 1 maybe 200 rpm quicker spooling

It also makes a difference how the piping is run and how many turns or tight turns there are in the piping

As stated that is a big turbo so will be very slow to spool

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Old 01-04-2015, 08:03 PM   #6
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Originally Posted by 1turbofocus View Post
I have no issues with 2 inch from the turbo to the IC and 2.5 from the IC to the TB

By doing 2 inch it helps to spool ever so slightly quicker , if your 3 inch from the IC to the TB you could gain 1 maybe 200 rpm quicker spooling

It also makes a difference how the piping is run and how many turns or tight turns there are in the piping

As stated that is a big turbo so will be very slow to spool

Tom
Yeah, the plumbing probably isn't the most ideal route but it isn't terrible. I might change it around later on down the road. What are your thoughts on the stock throttle body?

Btw, your last tune was good. I should have a datalog for you sometime during the week.
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Old 01-05-2015, 08:12 AM   #7
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TB will help a little but dont expect a lot from it

Tom
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Old 01-07-2015, 06:53 AM   #8
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Just ordered an intercooler with a 2.5" inlet/outlet. Should flow a little better considering my current set up. So now, it will be 2.5" hotside, 2.5" intercooler, 3" coldside. I will eventually upgrade the throttle body to CFM's 67mm. I have a shorty K&N filter on the turbo because it is the only thing that fits. I wonder if that is adding any restriction.
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Old 01-07-2015, 09:34 AM   #9
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Can you not get any pipe between the filter and the turbo ? even if you can only get 4-5 inches it would be better then none

Tom
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Old 01-07-2015, 11:53 AM   #10
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Quote:
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Can you not get any pipe between the filter and the turbo ? even if you can only get 4-5 inches it would be better then none

Tom
There is literally no room because the turbo sits so low. There are two linkage cables in the way. One of them can be moved a little so I'm going to see I can somehow get some piping on there or maybe even a silicone elbow and route the piping upwards
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