Hi i have a 4th gen f20a4 prelude i did the h23a vtec swap but i have a little problem i forgot how the vacuum hoses were connected i used the upper part of a h22a inlet manifold for the sensors and i drilled and tapped a place for the inlet temperature sensor used the original fual rail of the h23a vtec with the injectors with a custom made fual hose and i want to know if i need to delete the resistor box the car runs fine but only idle weird on 95 octane on 98 octane little bit less and on 100 octane olmost fine.

 

remove the resistor box and use the jump plug from the h23vtec harness to jump them out ..

 

thanx for the info

 

All you gotta do is use the bottom end of the IM for an h22a1 or h22a4 and put the top end that you already have, on it. Then no need to drill or anything. The h23a vtec head is simply an h22 head. Then just use an accord or prelude fuel rail.

I don't see any question about vacuum hoses.

 

I know it is a little bit confusing im not that good in english i live in holland it is my first line of the message the other things are already solved today i deleted the resistorbox but its still not connected im soldering it tommarow. So if some has a few pictures of his h22a inlet manifold with the vacuum hoses connected it would be nice. And the car is running im using the gearbox of the f20a4 it has longer gears but i still kick b16's with a 800kg body with 2 fingers in my nose and on the highway in 5th gear vtec open(160km)
i even dont need to shift down to win

 

You only need vacuum for your FPR, Map sensor, and brake booster IIRC. I believe everything else can be capped off.

 

Without throwing a CEL?