also on what gear are you seeing 1.1bar???
you must see full boost in higher gears just put it on 4th gear at 3000rpms and floor it when it reaches 3500rpms check what the boost is?

maybe 1.1 you are seeing it in 1 gear??? just a thought!

 

How do you make sure all valves are closed? Will it leak 100% of the time if they arent closed?

 

Ok, some updates. I've done a boost leak test, and I still hear air leaking around the throttle body. It changes tone when I open the throttle. Not sure what to do about it. I've already done the shaft seal replacement once.

jrsimon27, I hit a max of just under 1.1 bar in all gears, not just first.

I've felt for the restrictor pills after the BCS, but I can't find either of them (near the BCS or near the turbo). It could be that I'm overlooking them somehow but I wouldn't think they'd be difficult to find. I don't think I'm missing both of them AND leaking at the throttle body.

I've checked assorted vacuum lines but didn't find anything loose or leaking. The air leaking around the throttle body is pretty loud, so if I have a tiny leak elsewhere I might not hear it.

Any ideas? Should I try to get a used throttle body? Send mine off to WORKS for rebuilding? I hope I didn't mess the throttle body up in some way and make it un-rebuildable. I can't afford the $700 core charge. It sounds exactly the same as before I replaced the seals; I would think if I had messed it up it'd sound worse.

 

Hey Tom whats your setup on your MR? When my MR was stock I held 1.1 kg/cm2 also. The stock boost control kinda sucks.

 

Really? Hmm. My car is stock apart from an oil catch can. It's just that I can hear air leaking near the throttle body when I do a boost leak test, so I don't think that it's the stock boost control. Still, it is a very steady 1.1 kg/cm2. Would it be really erratic if there were a leak?

 

Im almost positive what your describing is normal. Like I said, my 06 MR when I got it boosted to 1.2 kg/cm2, & would hold about 1.1-1.2 in 4-6th gear. After I installed my MBC, I hold 1.5 flat in any gear 3rd & up. First through 3rd will spike to 1.5, then vent to 1.4. The stock pill system is very inefficient in my opinion. When I installed my MBC I removed about 90% of the hoses & tubing. This way hits the boost quick & keeps it steady all the way to redline. The difference between 1.1 kg/cm & 1.5 kg/cm is amazing.

 

Well that kind of turns my view of the situation upside down. When I took the car to the dealer and told them it wasn't making full boost, they offered to take a new IX MR for a spin and see what it boosted to. They said it went to 1.1-1.2 kg/cm2, just like you just said; I assumed that they were either lying to get rid of me or driving the car like a grandma but apparently not. I guess '06s might make more boost than '05s, explaining why my gauge only reads 1.0-1.1 and you see 1.1-1.2?

Ok, so where do we stand? In all the "what's stock boost?" threads, people say that 2005s make 20.3. I didn't see anyone saying "they advertise it at 20.3 but I only see 17."

So does the factory MR-edition gauge consistently read 15-20% low? 1.1-1.2 kg/cm2 is only about 15.6-17.0 psi, and my car does NOT peak over 1.1, at any time. Anyone else have an MR and see nowhere near 1.43 kg/cm2 (=20.3 psi) on the stock gauge? Anyone have an MR, replace the gauge, and notice much higher readings on the new gauge?

The sound I hear when I do a leak test sounds so much like this thread: https://www.evolutionm.net/forums/sh...d.php?t=209776 that I thought my situation was exactly the same, but either I botched the seal replacement or that wasn't the problem.

 

maybe the new seals weren't seated properly when you put the TB back together again. It seems to me like you may have to re-install the seals if you want that leak to go away. Its a pesky leak and probably one of the worst you can get considering that it usually starts leaking with minimum pressure. this is very likely one of the reasons you are boosting lower than normal. you don't have a MBC to help "overcome" the loss of boost and the BCS is just going to boost a set amount. Leaks anywhere in the system are going to kill your boost/power.

 

Ugh, I didn't want to read those words Well, the side of the TB facing the front of the car is where it sounds like the leak is coming from, and if I remember correctly that's the side that was easy to replace the seal in. If it was too easy to get the new seal in, maybe it's a hair too small to make a good seal with the sides. Does anyone think it'd be a good idea to squirt a little gasket maker around the edges before I shove the seal in, or is that a stupid, stupid plan?

 

Did you have to overcome any resistance to push the seal in? As long as the gasket maker isn't going to harden and crack the rubber seals prematurely, give it a shot. Don't forget to test your system again, before taking your car for a spin after fixing this leak. There could be other leaks that will need attention before testing your boost on the road.

 

before you go tearing apart the TB agian go to the dealer and purchase a new set of hoses for the stock BCS with the pills in and reinstall that.

 

There was a whole lot of resistance pushing the seal in on the firewall side of the TB, and the old seal was extremely hard to remove on that side too. I thought I was doing something wrong and kept re-reading the directions to make sure I was pushing the seal in the right way. There was resistance putting in the seal facing the front, but much less. It was easy to get in. If I remember correctly (it was about a month ago) it was tight enough to not fall out when I tilted the TB, but loose enough that it came out again when I put the shaft back through.

I'll do that. I may have just missed the pills the first time, not knowing what to look/feel for, but at the same time I'm not an idiot and I did try to find them. They may be missing, and from what I read the set of hoses is only about $15.

 

even if you have a small boost leak or two you still should be able to make the normal amount of boost a stock EVO makes. Unless there is a problem with the stock boost control solenoid, which I believe is your problem, in which case a new set of lines will fix.

 

Hey guys, sorry for bringing this thread back from the dead, but I got a new set of BCS vacuum lines with restrictors from the dealership and I'm making full boost now! I just put them in last night, and I only took the car out for a quick spin because the weather is awful. Can't wait 'til it stops raining and I can get used to 5 psi more boost! Thanks, everyone, for your help.

 

good to hear !