large_x7

iTrader: (1)

Okay guys, I need some advice. I have already searched and I understand all the risks/rewards of going non-seq. What I am looking for is some advice particular to my situation. So here goes:

I will be garaging my car for the winter. I plan on doing some major work/servicing to it this winter, since I will not be driving it! Since I will already have it very much apart, I was thinking of going non-sequential. The main reason for this is because I have been having boost issues (no secondary) ever since I did the vacuum hose replacement in June, and I am getting sick of trying to find the problem. The only performance mod so far is a downpipe, but I do plan on adding exhaust, intake, FC, and possibly either a MP or high flow sometime in the next year. But all of those things can be added without taking the whole car apart!

So my question is, would it be worth it to go non-seq now, or try and track down my boost problem (which I have had no luck with so far!) and keep the seq setup? How bad is the lag without a full exhaust, etc?

I'm just looking for opinions here, any input you have would be greatly appreciated! Thanks guys.

jalers

I have had the same problem for almost a year with no second boost. I did all the trouble shooting there is to do and nothing. Did you look under the turbo to see if the turbo control acuator is connected cause the snap ring falls off? If that is still on then tak off your intake hoses and disconnect the part that goes over your second turbo (by the fire wall, 2 -10mm nuts). Now try to spin your turbine blades. I did that and I found out that they were seized .Time to get some rebuilds if seized. Don't know if you can run them non-seq. with just the primary turbo.

large_x7

iTrader: (1)

No, I don't think they're seized. I get boost sometimes, which leads me to believe that maybe one of the hoses is kinked or something is not connected not perfectly right. I just haven't been able to find it, and its driving me nuts! I don't want to have to redo the vacuum hose job, just to find the one part thats giving me trouble! I checked the TCA and CCA per the instructions I received in a previous thread:
https://www.rx7club.com/forum/showth...hreadid=127557
So now I'm at this stage. What to do?

Mahjik

iTrader: (1)

Well, I would suggest you track down your problem. If you had full boost before you did the vacuum hose job, then it's just something in your work that is messed up.

Just recheck your work, I'm sure you'll find a mis-routed hose in there somewhere which is probably the cause of your boost problem.

Good luck.

large_x7

iTrader: (1)

Yeah I don't know if I had full boost before I did the job cause my dumbass put the boost gauge in afterwards. But the car certainly feels slower. I guess I can double check it this winter; its just redoing everything thats already been done that kind of annoys me!

WONG FRIED RICE

How do you know if you have no second boost? I can't tell....(sorry i'ma n00b)

large_x7

iTrader: (1)

i watch the boost gauge. it goes 10-8-4. doesn't hold boost after the secondary turbo spools up.

dubulup

I would track down the gremlin eating your boost before you start moding the car, since its pretty much stock now...I had a boost problem for a month before I track it down. But I was very happy when it was fixed. I'm an idiot though.

Mahjik

iTrader: (1)

I had a similar problem over the summer. I was fixing a gas odor problem. When I finally got the car back on the road, my boost wouldn't hold after transition. I was basically getting 13-8-fall down to 0...

It was the two vacuum lines going into the UIM on the firewall side. They were short and I had a difficult time getting the UIM installed again and getting those attached at the same time. I ended up replacing them with some longer hoses to make the UIM install a little easier and it fixed the problem. I assume one or both of those hoses weren't attached properly.

May not be your problem, but it's a start.

JSpecRZ

What is your vacuum at idle?

Try spraying carb cleaner around all the vacuum lines.. under the UIM and turbos... your car will stumble if there is a leak when you spray the cleaner...

Also, check you main cat.. it's possible that it could be clogged.. i had that problem.. i couldn't see past 5lbs on my secondaries..

I've been in the same situation... but I am going non seq.. I have all the block off plates, will run a power FC, remove the entire rats nest.. and run no cats.. I'm trying to simplify as much as I can now and get it ready for a single turbo set up in the future..

hope this helps..

13brv3

Check out the this thread, particularly my last post:

https://www.rx7club.com/forum/showth...ighlight=rusty

I had no secondary when I got the car a couple months ago, and ended up doing a much needed hose job. Once I fixed the hose problems (and there were a couple), I had boost intermittently. The final fix seems to have been the turbo control solenoid that's mounted on the ACV.

As for seq vs non-seq, I'm pretty convinced that seq is the best way to go, until you NEED to go seq due to spiking or other issues.

Good luck,

large_x7

iTrader: (1)

Thanks guys. Hopefully when I have the UIM off, etc. something will jump out at me. Otherwise, I will have to examine everything a little more closely. Wish me luck!