7THSIGN

Some of you may know from my last thread that I am going to be checking my Y pipe and seeing if it’s the reason why I don’t get boost at 4,500rpms where the secondary turbo should come on. Now before you tell me that the cause of my problem could be something else, the car has been taken to a reliable Rx7 shop and they replaced everything from a full hose job, to solenoids, to actuators, to nipples, spark plugs, earth wires etc….. They did not however check the Y pipe and some people on here told me that could be the cause of my problem.

I found this site to help me get to the Y pipe and remove it:

http://robrobinette.com/efini.htm

But I could not find a diagram of the inside of the Y pipe and what exactly I am looking for and should check or replace. Could anybody help me with a diagram of it? I would really appreciate it. Thank you.

My cousin and I have had the car for about 6 months now and for all those months we have had this problem, we have yet to feel the true performance of an RX7. I know this Y pipe might not and probably is not the problem (to good to be true), but I really need to check everything. We need to fix this car!

7THSIGN

I will be checkin out the y-pipe this weekend. I doubt the y-pipe is my problem for loss of boost on secondary. However I am thinking about converting my turbo's to non-sequential. Will this help me find out wether its something that controls the secondary such as silinoid or the turbo itself? I know someone who did this but then had problems with secondary is it unhealthy for the motor? My main question is will this help me eliminate some of the things that can be causing no boost in secondary?

KINETIK_FD3S

did they overlook the crv valve? i have the hose diagram but its 217kb and forum only allows 100kb

7THSIGN

correct, they checked the crv valve and all hoses. They didnt check the Y pipe though, that is what im planning on checking but im not sure what to look for.

BlueRex

Don't sound too reliable if they couldn't find your boost problem

The y-pipe removal is pretty straight forward. If you look at the shop manual on www.iluvmyrx7.com you can see the diagrams and everything that has to be removed. A few bolts for the airpump, loosen the belts, remove the secondary turbo inlet, etc... I'm not sure how this could be the issue of your boost problem, unless you are referring to the coupler that is known for forming a slit.

As far as going sequential, I'd read up on it a bit more before you decide to do something that drastic to fix your boost issues.

7THSIGN

Yeah, well i wish they could have found the problem. They have no idea what it causing boost to fall to 0 psi at and after 4,500rpms. They say it could be my 2nd turbo that is missed up and needs to be rebuilt, but the car only has 65k on it.

I dont know, I might just have to take it to another shop and see if they can fix it.

Speed of light

iTrader: (8)

Did they check to see if the TCA is opening to allow exhaust to spool the 2nd turbo? If not, the primary boost would vent back to the airbox through the 2nd turbo when the CCA on the Y-pipe opens. Also check the CRV as well.

I once had an exhaust leak (loose turbo mounting bolts) that prevented the proper pre-spooling of the 2nd turbo, giving the impression that something was wrong with the turbo itself.

7THSIGN

The shop "says" they checked it.

BlueRex

Before I worked on my car myself I had a shop work on it once (can't even remember what for, because it was so long ago). When I got my car back it had more problems then when I brought it in. They told me it was because my secondary turbo was messed up and told me I should go single . I took it to a shop that specialized in RX-7's and they found all sorts of stuff that the first shop didn't put back correctly and told me that my turbos were fine. All this was after I had already bought a replacement set of turbos from a fellow forum member.

What I'm trying to say is don't believe everything the shop you take it to is telling you. They will feed you lines of bs especially if you're not car literate.

Mahjik

iTrader: (1)

http://www.autosportracetech.com/RX-...BigPicture.htm

7THSIGN

BlueRex, I can’t agree more with you. They said that it might be my second turbo but I don’t believe that. I think I am going to take it to another shop and see what they say. Thank you.

Thanks Mahjik, that’s exactly what I was looking for.