I think i asked you this as well at one point with the old motor? I think the only way is a leak down test per cyl from what I found. I could be wrong though.

 

I gotta admit, there is nothing like modding a N/A car. Just when you think everything is dialed in and done, something pops up out of nowhere. I had Aaron @ English Racing switch me to Speed Density this last week and WOW what a huge difference in response and drivability. Then 30 miles into driving it I threw a p0172 code (bank 1 running rich). Car started freaking out on me instantly. Did a bunch of reading and research, thought it was a number of different things that could be wrong with it and was about ready to spend money on things I didnt even need...lol. Decided to swing by after work and had Aaron throw his PC up to it. Found out it was a little setting in map that was tweaked weird. Reset the correct ratio and once again all was good. I found out quick how easy one little value can throw the tune out of whack.

 

Yeah one little setting can really mess things up. Kind of at a loss at this point as to how to fix this issue

 

Do you have any paper gaskets other than the exhaust manifold? Maybe a paper gasket finally went?

 

This is my thoughts now at this point. My only guess is that when I overboosted to 18 psi those couple times that it blew maybe the throttle body gasket or something, I have taken off my throttle body several times without replacing the gasket. I sealed off the entire intake tract from the turbo to the intake manifold and did a leak test with no issues but not sure how to test the intake manifold iteslf. I guess I could loosen the rocker arms for the intake side to close all the valves then run a test?

 

I don't think there are any leaks...Exhaust/Boost/Vacuum. Unless your seeing A/F readings that are way off from where they should be. If A/F is still reading correct, then its most likely another issue.

 

You still running stock internals? Is your compression all still good?

 

I run the Evo Tb with the Evo Tb gasket !
Check the wastegate adjustment and if there is any boost leaks .

 

Here is the thing with that. I am still running a tune set for 15 psi which means my afrs will already be rich since I am still dumping the same amount of fuel but not taking in the same amount of air with the low boost., Vacuum looks fine while cruising however boost will push the limits of the gaskets far greater than vacuum will.
Still running stock internals yes, I have not done a compression test and probably wont as it drives fine runs good and starts to pull good until it cuts off at 9psi then just steady pull.
Leak down test helps to determine where compression is leaking from if you have low compression in a certain cylinder but would not help me in this case testing intake mani pressure.

 

Pulled off wastegate and even installed a bigger spring and bypassed MBC with no change in psi. Confirmed no boost leaks at least up to the intake. Debating loosening those rocker arms tomorrow and testing mani itself.

 

Damn, wasn't even thinking bout the fact your running the tune for 15psi. It would throw you rich now...

I'm still at the early stages of learning most this stuff.

 

Yeah its a ***** when **** goes wrong lmao.

 

What do you mean testing the mani ? Doesnt it test everything by doing a boost leak test ? The way i test it usually shows everything .

 

Im redoing some stuff on my car right now and going to throw a Evo fpr on my car so that when running lower boost it doesnt completely bog it with so much fuel .

 

Right now im trying the theory of coated stock pistons make the stock block hold alot more power