Turbo questions: Specifics

Information on the naturally-aspirated KA24E and KA24DE engines.
encasemyheart
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Joined: Wed Sep 25, 2002 1:29 pm

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A few questions about the turbo kit I am putting together.

1.) The intercooler piping, how hard is it to piece together? Do you just see what the pipe routing would look like and buy the piping and piece it together with couplers?

2.) The BOV, do you have to route it back into the intake? With other cars you do and I assume with the MAF setup you would. If you do, can't you put the BOV on the hot side of the intercooler for less pipe routing back into the intake? I see most people put it on the cold side of the imntercooler...

3.)How hard is it for an exhaust shop to make a downpipe? I already have the flange for the turbo, can anyone do this or is it pretty specialized? Is a flex pipe needed for the downpipe?

4.) Cost. About roughly how much for intercooler pipes and how much for downpipe materials?

5.) I assume the intake is just a piece of pipe the same diameter as the turbo outlet witht he MAF and cone filter on the MAF, right?

6.) How do you secure the intercooler in place? Do you need to weld on brackets or something or do the pipes hold the intercooler up?

Thanks alot for the help. I just want to take care of specifics before really installing everything.


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C-Kwik
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Joined: Thu Aug 01, 2002 9:28 pm
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1. Yes, but I would imagine it would be a little harder than it sounds. Not Rocket science, but perhaps some trial and error and it may be little time consuming to get it right without having to buy more bends then you need.

2. No, but it may stall when you stop after coming off boost. POssible solutions are to run a blow-through MAF or a piggy-back that can compensate, ior if you're looking for something more exotic, a stand-alone that uses a map sensor to measure airflow.

3. Depends on the material. But other than that, it's not much more difficult than any other exhaust pipe. A flex pipe is not absolutely necessary, but not a bad idea to have. It keeps some of the load from expansion and exhaust movement off of the turbo and manifold which would minimize cracking. It would be more crucial if your exhaust was sold mounted to the car(without rubber hangers).

4. Depends on materials and how long, wide, nd for the I/C, what brand, size and type. Best to do some shopping around for this.

5. I'd match it with the Turbo compressor inlet. Or is that what you meant? But yes, the other end would have the MAF and filter.

6. Yes, brackets are the choice of most. The piping can probably hold itself up just fine. The intercooler should definitely be mounted to the chassis though. Last thing you want to do is buy a $1000 I/C and end up running over it.

encasemyheart
Posts: 634
Joined: Wed Sep 25, 2002 1:29 pm

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1.) yeah, I'm studying other people's intercooler piping to see what they used, which should give me a rough idea of what I need, so hopefully I won't have to buy too much extra piping.

2.)That's what I figured without a blow through setup. But what about having the BOV on the hot side of the intercooler? This seems like it would work and I wouldn't have to have an extra pipe running across the engine bay.

3.)Thanks. I am having a seperate dump pipe going from the tial wastegate exiting under the car. I assume the pipe will only be about 1" diameter, do they make a straight through muffler for something that small? I don't want the dump pipe to be too noisy, or is it already pretty quiet with a regular dump tube?

4.) I figure about $150 roughly, realnissan wants $450 for a four piece intercooler pipe set, which seems a bit high for only pipes...

5.)That's what I meant. Between the turbo compressor and MAF is where I tap the BOV, will drilling and some JBWeld do the trick to make a place for the bov to vent? Same with actual BOV mounting, will mounting it with only JBWeld do it or is welding necessary?

6.) So getting everything together first and working and then taking the whole completed car to a shop to get some brackets on wouldn't be out of the question?

My big thing is having all this done at home, or at least everything but the downpipe...Thanks alot for the help.

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hannibal
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About the BOV, most people mount it on the cold side becuase its closer to the throttle body. When you let off the gas (and the TB closes), pressure starts building up at the TB and works its way back toward the IC and then the turbo. So having the BOV near the TB should improve throttle response slightly.

encasemyheart
Posts: 634
Joined: Wed Sep 25, 2002 1:29 pm

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IWannaS15 wrote:About the BOV, most people mount it on the cold side becuase its closer to the throttle body. When you let off the gas (and the TB closes), pressure starts building up at the TB and works its way back toward the IC and then the turbo. So having the BOV near the TB should improve throttle response slightly.


Oh okay. Thanks alot, I didn't know that.


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