little problem... boosting too much

BKs50trimGST · 04-04-2007

ok guys... in the past week I installed a new fmic (a lot bigger then old one) and the piping is now short route. I tested my type-s bov and it was leaking, so I installed a 1gbov crushed. When I first took out the car i may have boosted a little too high, around 22-23psi spike. After that the past few days I drove on it normal. Yesterday, I turned down the boost just to get it set at about 19psi and about a 20psi spike. Well everytime I would turn down the boost it wouldn't change. Now the car boost spikes to 25psi while accelerating and still goes up, so I cut it off before any higher. Could it be the BOV?

BKs50trimGST · 04-05-2007

if this will help, i run a 50 trim, internal wastegate and a MBC

EclipseGST · 04-05-2007

No its not the BOV... Bypass the MBC and see if it still happens. Hook the line going to the MBC directly up to the wastegate actuator. If it still happens, you are just getting boost spike and need a ported housing or something that will flow a little better to control boost.

If it doesnt happen, then replace the MBC or you have it hooked up wrong. Make sure the lines are all hooked up and good to and from the MBC.

**JET** · 04-05-2007

Is the wastegate on the 50 trim ported or a large flapper?

BKs50trimGST · 04-05-2007

when i had the type-s bov the intake was going to the bov, now that i switched them i just plugged the intakes bov return and have nothing going to the 1g bov.

EclipseGST · 04-05-2007

The BOV is not your problem! Hook the line back up to the BOV and leave it.

Where is the line coming from that goes to the MBC?

BKs50trimGST · 04-05-2007

both lines from the MBC are going to the turbo, the bov line is all hooked up right, i put a little clamp on just in case it wasn't leaking a little bit, i'm gonna go test it out now, I still don't think this will solve my problem.

BKs50trimGST · 04-05-2007

took it out on a test drive, still is boosting way too high. Everything is hooked up right, i think it has something to do with the BOV, before the BOV wasn't venting, my type-s was hooked up to my intake bov return. Now the intake BOV return is blocked off and the 1g crushed is venting... i turned the MBC almost all the way down... to the point where its almost out all the way.

**JET** · 04-05-2007

A BOV can't raise the boost level, it just vents when you let off the gas. Are you using the brass 90* in the turbo for the reference boost source?

BKs50trimGST · 04-05-2007

i'll take a look at everything tonight, maybe i over looked something, and i dunno if the i'm using the brass 90*. sorry if i'm not helpful, i do believe that my internal wastegate was ported out, shindley put my car together and i do believe remembering him telling me he did.

BKs50trimGST · 04-06-2007

so i just eliminated my MBC and took one of the lines and zip tyed one-end to the wastegate actuator and the other to the turbo... the wastegate held to 16lbs and then launched to like 25lbs. I think its because i accidently cut the line a little bit, and when i hit max boost on the acuator it broke open the line. So, tomorrow i'm getting a new MBC and lines, hopefully it'll solve my problem.

EclipseGST · 04-06-2007

Just replace the line if you cut it... Thats all there is to it!

BKs50trimGST · 04-06-2007

ok, replaced everything and well it's still doing it, so that means that it must be the wastegate, right? Any ideas of a route i should go for a new wastegate?

**JET** · 04-07-2007

The wastegate probably just isn't flowing enough, I doubt it is bad. You can adjust the arm some. It should just BARELY push on the wastegate to keep it closed. That will allow it to open as much as possible. If that still doesn't cut it, then you will probably have to have the wastegate ported.

BKs50trimGST · 04-07-2007

ok, can you explain to me how the wastegate arm works, i've looked at it, now i just need to know how to adjust it so that it barely pushes on the wastegate.

myslow00transam · 04-07-2007

well see everyone i am having the same problem except that mine is all stock. and i have placed the vacume line from the intake to my wastegate and it does nothing at all i have tried everything i can think of but replace my wastegate unless there is something hooked up wrong somewhere like a vacume line i have no idea i dod not install the bov or mbc so i am sooo comfused and well my moms funeral is tomorrow so if anyone can help that would be awsome thanks

BKs50trimGST · 04-09-2007

my new solution.... When I was first building my 2g eclipse I bought a 50 Trim internally gated off of ebay, well turned out that I got scammed and the turbo was bad. So after storing it and losing it I finally found it. The wastegate is identical, so i'm just going to swap them and see if that works. The one that's getting pulled out will just be looked over and maybe ported out. If anyone knows anything about porting out wastegates let me know!

MATCHBX · 04-10-2007

I had this problem on my old car and it ended up to be the wastegate actuator wasn't working. Might want to check that out as well.

Talon628 · 04-10-2007

Quote:

Originally Posted by MATCHBX

I had this problem on my old car and it ended up to be the wastegate actuator wasn't working. Might want to check that out as well.

Was just gonna say that..Did in all of your guy's searching to find a problem think of your waste gate actuator...its probly not hooked up or you eliminated it when you put your MBC in didnt you. Just had my buddy come over yesterday bitchin how his car was boostin up to 20 psi, I go look, and the actuator is just chillin with no lines to it, you might wanna check that. And a crappy bov would cause a vac leak, not huge psi spikes. Witch would make your car run like ass.

BKs50trimGST · 04-10-2007

all my lines are running where they are suppose to be, the line to the BOV, the line to the turbo and the line to the wastegate, the lines from the wastegate and turbo are going to my MBC, and are set-up correctly. Last night I swapped the wastegates and well the problem isn't fixed but better, so i'm gonna try a different MBC just in case my old one worked and it was just the wastegate, if that doesn't work then it has to be something with the BOV in my mind. Can someone explain to me about why you would recirculate your BOV to an intake return? My Type-S was recirculated before I took it off, now that the 1g crushed is on I don't have it recirculated, but I changed my FMIC and the set-up went to short route IC piping, would that be why I don't need to recirculate?