I feel the same way. Thats why im going to school for it.

 

All about who you know

 

I know a lot of ppl here, but nobody with ecotec knowledge. Even though it's probably basic compared to the BMW's and Audi's they tear apart...

All good though. I'm about to take out the intake mani etc and new gasket. Hopefully this will work and I will be finished!

 

Did the gasket, filled it up with silicone. Let it cure for about an hour an half, then I tightened the bitch all the way down. Did another boost leak test and well no more leak from intake mani gasket... However there was a little leak from the evap purge solenoid. I took it out and put some silicone and pit it back. Gonna go tighten it in 20 and try another boost leak test. Progress is definitely being made!

 

Good to hear man, keep plugging away!

 

Good luck man!

 

So did all that. Found a tiny leak again I guess where the MAF sensor is. I did that back in june I guess there's another one. I'm gonna redo that. However the leak is tiny compared to what it was before. My first log and guess what!!! Same ****. Surge blah blah blah idk. I'm gonna guess it still needs tuning after that huge leak. Maybe the MAF sensor leaking is that bad and ******* it up. All i have to asy 7.5k rpm redline is badass...

 

But why only 7.5 and not 8k?

 

^^ this lol

 

WG rod is too short which is causing the surge. MBC or factory WG control?

 

Term he was on factory control and then went to a mbc. Had the same issue with both.

 

Than that further reinforces my theory about the WG rod being too short. Short WG rod mens the WG cannot open enough even if it needs to. That introduces surge as it spools up.

 

You think so? I tested the flap when I connected the rod with the new 1.5 bar spring adn thenew pre load. It opened up normally. I get surge when it's spooled up or like 300 rpm away. It surges when it's like about to hit peak boost. I never spike or anything. Just surges at 4.7k rpm etc.

But yea. I fixed all my leaks AFAIK. I did the intake mani gasket, no leaks. did the Evap purge solenoid, no leaks. Did another test, found leak from MAF relocant and MAP sensor AGAIN. Pulled that **** off last night and redid everything. The car pulled like a big turbo should last night. I haven't felt that since my EFR... Still surges though. I'm guessing just needs a little more tuning. Maybe Cams are tricky? I dont know we'll see what James says.

 

Never thought of that, as I most people I know that run larger turbos are externally gated. Good point Term.

Even so, I bet the car came into boost so much harder with the leaks fixed.

 

I'm going to adjust preload on saturday if we cant tune through it. I just hope it doesn't get worse LOL. A lot of the evo guys have problems with these wastegates.

Term, I got a question for you. I have a 1.5 bar spring in right now. I put my MBC to 0 I should boost to 22 psi right? Well I'm surging and peaking at only 17... So idk what that means. And before the 1.5 bar spring when I had the 1 bar spring in with MBC to 0. I would only boost at 13-14 psi as I should.. So what does that mean?

 

idk if I have the same wg as you or not but I have small flutter from about 4500 to 4700 then it's smooth from there til redline. and that's only in 3rd and 4th gear where it's a bit of a slower spool.

 

Yea, I'm gonna try and go back to the regular boost solenoid soon. We're gonna see if he can control everything better using that since there are no leaks etc.

 

Have you thought about switching tuners? Honest question, and not a ash towards james but I would love to see ur car with someone else running the computer

 

I've told him that multiple times. Someone should step up to the plate though...

Sent from my Samsung Galaxy S4 using CobaltSS

 

I have, but the only person that I would trust in this case will not tune me. Or probably anyone else at this point. I'm going to keep with James until he says he's not going to tune me anymore. For now after all these leaks I will stick with James. I'm sure he can tune it now without all these comlications I've had.

 

Are you talking about me? If so I have never said I would not help you.

 

I believe it is a combo of a few things. You have the wg rod too short more than likely, and honestly surging with heavy wg springs and MBCs is very common as the wg cannot open properly when it needs to. I had a MBC on my stock turbo before we had wg control and I hated it. It surged a lot at mid throttle (ran a 4.2 60-100 though stock turbo on 93 LOL)

 

Okay, I will try it out and losen the preload on the WG spring. I'll have to do that on friday or saturday. Today I'm going to log some more for james since the car has no more boost leaks 100% now. So I'm gonna see what he says. Then put the stock boost controller too. I'm thinking maybe the MBC is causing the turbo to spool too fast and causing the surge. IDK yet though. I was talking about GMtech to tune my car. I know you would tune my car lol, we've spoke about this before like 2 months ago. You and 09cobaltss1 are on my list if I need to switch. I don't think that's going to happen unless I see no other resort.


What If I just removed the line going to wg and gave it gas to build boost. What should happen if wg works properly what should happen if it doesnt...

 

GMtech is too arrogent IMHO. I do not like dealing with him because he will never admit he is wrong even if he is. John (09cobaltss1) gets my recommendation if you were not picking me. It should boost 22 psi or so with the 1.5 bar spring but if the rod is too short it will surge badly as it spools which could hamper its ability to build boost safely and properly which explains the 17 psi max you are seeing (assuming all leaks are fixed).

 

The turbo isn't spooling "too fast" for an MBC. There are plenty of turbo's that spool much faster with no issue. Could the EBC help bandaid the issue? Perhaps. As term said, loosen the wastegate rod and try it out again with the MBC still hooked up to eliminate any more variables. IWG's have never been my favorite, but you gotta do what you gotta do.