thejdm.com v3

[Teaks92HB]

Hey guys, I just traded my 97 4 door for a friends 92 cx b20z turbo hatch.. I think I got the short end of the deal. The car shuts off at 5K rpms and seems to be pushing only 2 lbs of boost. What the car has b20z motor, si trans, off brand turbo, pr4 ecu (needs hondata installed), msd with launch control, a/f guage not hooked up, boost guage, turbonetics waste gate, hks bov, fmi, greddy turbo timer, fuel pres reg, fuel rail, venom 320 injectors, 4 wheel disc brakes and teg interior.

I know nothing when it comes to boost. I do know I need to run new vacuum lines to fix the hack job he did, I need to re-do oil lines b/c of a leak at the pan. It has an exhaust leak where the manifold and turbo meet, it seems as if the gasket blew out. The waste gate was only hooked up at the vac port, the boost port was not hooked up to any vacuum lines, or does this need connected to port on turbo compressor?

Any suggestions on what to do or where I can find more info will be greatly appreciated. I've checked out a lot of Honda-tech topics but its like reading Greek. I almost feel as if I would be better off putting new oil pan on it and throw a stock header on and run it that way.. I've always wanted a boosted car and now I have it and I'm more depressed at the work it needs.. But lemme know what you guys think.. thanks!!

[tenchu]

TEXT WALL! Shit! Could you make me a diagram of vac lines and open vac ports, in paint or something? Throwing any codes (I assume you know how to read CEL in OBD1 Honda)? What kind of EMS? What is preventing the MAP from reading boost? Missing Link, Check valves, anything?

[Teaks92HB]

No codes which I have no idea how it's not throwing any, has missing link installed which I'm not sure what it does. I know it lets the map do its job. He had some "chip" installed in the pr4 ecu, what it does I have no clue, but with out it the car runs like total crap. I tried running a p72 and the car just bogs out. I would be here for a week trying to draw the vac layout..total hack job.

Today at work I installed a new gasket b/w the mani and turbo. Turned the allen head on the waste gate a half a turn and took her for a ride. She read 5 lbs of boost and sounded good. Didn't run great by any means but sounded way better. I found a crack in the manifold on cyl 4 runner. There is no dump tube installed on the waste gate which I know can't be good. Some how when the wire for the tach to the msd is unhooked the a/f gauge reads.. So I have a lot of wiring to go over.

But on the way home the gasket blew out..that's what I get for using paper gasket!! I'm gonna install the stock header, oil pan and short ram filter. I'm gonna take my time and buy new vac lines, a vac manifold, a new turbo manifold(log style), I would like to get new inter cooler piping and have my hondata installed. It's frustrating cause I always wanted a boosted car and the first one I get is a terd..

[Teaks92HB]

Oh btw I'm getting rc 550 cc injectors.. But I do not have a boost controller. I have a vacuum line running from the fitting on the compressor housing to the boost fitting on the bottom of the waste gate. Is that the proper way to run that?

Thanks Tenchu

[Teaks92HB]

this is her...

[tenchu]

Well to explain how the missing link works, you must know how a Honda map sensor works. Basically it reads the amount of vacuum in the intake manifold to determine elevation and adjust your map real time to compensate. Vacuum is the opposite of boost. When you go above 0 vacuum, you're into boost. The stock Honda map sensor doesn't know what boost is, so it freaks out when it reads it. The missing links job, is to prevent boost from traveling through the head into the map sensor, so the sensor will continue to read only vacuum. If you were to take off the missing link, and run the map sensor as factory, as soon as you hit boost, the map sensor would freak out, and put your car in limp mode (I went through this with my first turbo Civic). Assuming your missing link is working correctly (which I assume it is, you would normally throw a code for the MAP if it wasn't) then thats not an issue. A vacuum leak, or a crack in the manifold, is definitely an issue. As far as a dump tube goes, its not necessary, all it is going to do, is move where the wastegate dumps the raw unused exhaust, now, it is dumping it directly into your engine bay, the only real con, is the heat, and the carbon build up you will have in your bay. But its nothing to do with the issues you are having right now. As far as vacuum lines go, if you are going to tear it down till you get the parts to do it right, I would look into a Golden Eagle (or similar) vacuum manifold, and install it t'd off in your brake master cylinder vacuum line. The line from your wastegate should go to a vacuum line on the car (intake manifold, brake master cyl, etc). I always try to recommend the master cyl line to people who have the ability (or funds) to get their hands on a vacuum manifold, because it is the strongest vacuum source in your bay, which is important when you are running many things off your vacuum (wastegate, boost gauge, etc). NEVER, I mean, NEVER, T off of the map sensor vacuum, its too weak and will only cause issues.

If it wasn't for the cracked manifold, I would say start removing extras from the vacuum lines (boost gauge, bov, etc) to see if lack of vacuum is the issue, but you've got bigger problems to worry about. Also, I would definitely upgrade those injectors like you said you were going to.

Turbo cars are a lot of work and maintenance, there is a lot of extra strain on the car, and a bunch more things to break, or go wrong. But once you getting it running well and figure out how everything works, its a lot of fun.. I could never go back to NA.

Hope this helps, if you got any more issues or questions, feel free to ask.

[Teaks92HB]

Thanks a lot, I appreciate it. The waste gate has 2 ports on it. 1 reads vacuum which is on top and the one below says boost. I have the one on top going to vacuum and the one below is hooked up to the compressor housing. That sound about right?

[tenchu]

According to the Tial instructions, bottom goes to the intake manifold, top is vented, unless running a boost controller, then T off the bottom line, and run the extra opening on the T to the bc and the top of the wg to the other port on the bc.


http://www.tialmedia.com/documents/w3_t ... nstall.pdf

[Teaks92HB]

Got a dc sport 4 into 1 I'm gonna install. Hopefully can get it back to stock by wed.

[Teaks92HB]

Curious, what would be a good gasket to run for that turbo? Any particular brand or just a metal gasket? And will any one fit for the t3/t4 turbo?