Hi,

I have a 92 Honda Prelude 2.0 and working on a low boost setup (5psi) in combination with a Hondata s300 system.

I'm not sure about all the hoses coming and going in/out the intake manifold and which can be pressurized, so like to check what I should change.
It is hard to find this information clearly explained on the internet.

Thanks in advance!

Attached you can find 3 pictures with numbers.

 

Those are all the vacuum lines for the FPR (7), Brake Booster (9), Evap Canister (2,5), PCV Valve (3,6). Number 8 is your IAT sensor. I honestly forget for the life of me where 1, 4, 10 go...
However, none of them need to be changed for boost. A bunch of people here will tell you that you shouldn't run boost with the factory PCV valve layout, but as long as it doesn't leak you won't have any problems. I would, though, run a catch can between them to stop oil from entering the intake manifold. Oil = detonation. But from the looks of that throttle body, the intake manifold is already saturated.

-Amp

 

the oil in the TB is most likely from the valve cover crank vent hose that went to the original intake pipe.

besides that, everything the guy above said is correct. I do strongly suggest ziptying all the vacuum lines though to make sure none pop off under boost.

1 I'm pretty sure is EGR
4 is MAP sensor (firewall mounted)
10 is cruise control

 

100%. Just speculation based on how much oil from that has made it inside the TB.

Also, thanks for clearing those other numbers up!

-Amp

 

Thanks for the quick and clear reply!
Much appreciated.

One more question about the crank case ventilation:
Is number 11 also crankcase ventilation?
I checked the valve at number 12, seems clean and working fine but I will change it when it can cause detonation

I took this picture from the interwebz so it's not my car, also different engine!