LS6 Z28

iTrader: (4)

lastnight we dyno'd it again on the same boost as last time to see the difference in locking the converter made so I could send that info off to circle d so he could see how its acting. Now as far as any smoke after the pulls my tuner called me and said they basically lifted the valve covers up a very tiny bit to see if it changed anything and it actually did help to alleviate some of the issues we were having, I need to put in a catch can asap and some breathers but the oil pressure was still high but didn't hit the 100 lastnight but was close. Looking at the graphs he just sent me I thought he turned it up to 20 pounds last night but he did not, the most he took it up to was 17 pounds and didn't push it to hard. We are slowly but surely double checking everything and working on some solutions. Once everything does get alleviated and I get my catch can and breathers in ill have him turn it up harder but for right now talking with chris at circle D we are trying some things to test and see if its strictly just the converter slipping or if its both the converter and trans before I pull it.

bad6as

iTrader: (17)

do you have pictures of this combo?
imo 100 lb of oil pressure seams like a lot.
aes lost my busness when they said any thing over 22lbs of boost will lift the heads regaurdless of what turbo.

StrokerTA

Where is oil pressure picked up at?
Does it make 100psi at idle, or 100psi at 7000rpm?
If it is smoking on decel I would say your turbo drain is probably not draining fast enough, so make sure it runs downhill enough and is large enough.. We run 10an drains, and it needs at least 1" of drop for every 6-10" of travel...

Also, all my engines make around 50psi at idle and climb to maybe 75psi full throttle with good oil in it...

LS6 Z28

iTrader: (4)

I don't have current pictures yet, and all I can say is anytime I had any questions or needed help on anything Brian and the guys at AES was always more than accommodating and always helped me out. Talked to them a couple days ago about the oil pressure, he also agreed I need to put in some breathers and a catch can and that will reduce a lot of what I was seeing as far as high oil pressure.

LS6 Z28

iTrader: (4)

I posted the graph that was sent to me so you could see where it climbed during the pull. Right now I plan on getting -12 breathers and at least 1 catch can I think that should be enough unless you think I should need 2. I have talked to my tuner about looking into seeing if any oil got passed the seal in the turbo. He just got out of the hospital so giving him time to bounce back before he gets back to looking at it.

thompson

iTrader: (4)

I would almost guarantee you that it is the turbo leaking at high pressure. I have had the same problem numerous times with 3 different turbo companies when running high oil pressure. You MUST run a restrictor, High oil pressure is good for the motor bad for the turbo.

LS6 Z28

iTrader: (4)

I'll have it checked, but could you possibly send me a picture of what you mean or how you run your restrictor, this is my first big build like this so I'm not quite sure how to go about that

haulass350

iTrader: (2)

are you running a catch can? i have an AES 390 and a procharger as soon as i got it broken in enough to do a WOT pull i did and noticed i was blowing oil out all over the place, i was running 20-50W like the reccomended and had about 70lbs oil pressure, i installed a catch can and replaced the oil pan gasket where it it was leaking and havent had a drop of oil leak out since.

AES Racing

iTrader: (6)

We Recommend a LSX anything above 22lbs and or around 1200 RWHP as that's when the 4 bolt blocks tend to have issues.

AES Racing

iTrader: (6)

Proper Breathers are essential on these engines as the create a lot of crankcase pressure.

Anchor

All they're doing with this comment is saving your and their own ***...

Wouldn't you rather a builder go overboard instead of turn it into a budget "lets hope it will hold together" build?

allout06

iTrader: (11)

I also have an AES 390, (not running yet) but brian has always helped me and never has a problem spending 30minutes on the phone with me. fwiw, im running a -10 from each valve cover to a jegs catch can, plus a breather filter on the passenger valve cover to avoid these kinds of issues. GL!

bad6as

iTrader: (17)

Not all turbos flow the same. But for a statement that said 22psi is the limit was just wrong. I don't want to start a pissing match. They have alot of good running engines out there

T76s10

iTrader: (6)

why would it matter what turbo It is? weather its a 7675 or a 91.5 22psi is 22psi and nothing more. and that's not the first time I heard 22lbs is the limit for stock heads. someone did a in depth test and came up with 22.5 of when the head actually started to lift but I cant remember when or where I heard that. some people don't push water at that much boost and some people do.

bad6as

iTrader: (17)

So your saying a 75 and a 91 on 22 psi flow the same amount of air.

T76s10

iTrader: (6)

it doesn't matter how much air the turbos flow to lift the heads. the boost pressure is what lifts the heads. compressor airflow will determine hp capability and efficiency

bad6as

iTrader: (17)

Right. So a 75 on 22 psi would be less likely to lift heads then a 91 on 22 lbs because its not following the same amount of air.

T76s10

iTrader: (6)

just think of it like a wastegate. lets say you have a 60mm wastegate and its making 10lbs boost on a 4.8. put that same wastegate on a 408" motor and its still going to make 10 lbs boost even though the 408" is flowing more air than the 4.8 is. that make sense? pressure is just a measurement. im not a scientist that's just how I look at it. either way those heads are seeing 22lbs of force on them

bad6as

iTrader: (17)

my thinking. A 75Mm on 22psi Won't make as much cylinder pressure as a 91 on 22 psi. More ccylinder pressure would cause head lift. It may take a 75 35psi to make the same cylinder pressure as the 91 on 22 psi. That's why I said saying at 22psi the heads lift regardless of turbo IMO was wrong.

ren987

iTrader: (4)

Its all about mass flow, lb/min you can use the compare feature on garretts website to see what two turbos will flow in lb/min. And you will notice there is quite a large difference in mass flow between a 4202 and a 5543 at a pr of 2.5.

As for the op, like others stated check on the compressor side to see if oil was getting past on the other side as well.