Tuomas FIN

I have a problem.

I have a wet sump but due to low oil pressure at WOT I really need to upgrade system to dry sump. See the screen shot.

Any recommends of the systems on the market I do not need to change the crankshaft or internal engine parts? Even available?
Looking for simple, reliable system fits to street car, any advise?

Thanks in advance!

Petraszewsky

Check out Aviaid and their dry sump setups. Some are true multi stage setups while others are only single stage.

Tuomas FIN

Any opinions of this??

Petraszewsky

I would just give Aviaid a call and talk to them about the issue. They would be able to help out. What oil pump are you currently using?

Tuomas FIN

Thats under progress. Melling 10296 but pump is not the problem, poor factory oil pan and oil pick up system is the reason I believe.

inspector12

If your running the short snout crank Aviaid works good. So does the ARE- http://www.drysump.com/3255Spump.htm.
Peterson and Johnson pump are two others that make Dry sump stuff. GL!
http://www.drysump.com/LS%20Tanks.htm

GSpeed

Can you add a Qt and see if it picks up? It should stabilize. Being that your wet sump, you must run it .5-1Liter over full. Literally just experienced this same issue with another TT car.

inspector12

GSpeed is right about that even says to run a quart more in the GM manual or maybe its a half a quart can't remember.

Tuomas FIN

Yeah added and first thought it solved problem when made few test pulls.
Now again went to fail safe due to low oil pressure (limiter 3000) when tried WOT pull with new tranny on highway.

Tuomas FIN

I added one quart.

Tuomas FIN

Aviaid system is head mounted and that only possible place install the pump. Made so huge work with cold side keep factory A/C so don't want to take it off.
Just doubt system using wet sump pump for pressure side if that really solve the problem and is enough at 1500 hp level..

GSpeed

Try running the car at 4-4500 rpm, no load. Light throttle. This will pump the oil out of the pan, faster than it can return ( in the turbo feeds, the drains, scavenge pump, etc etc) and see if pressure just drops.

If thats the case, it may need to be overfilled even more.

Tuomas FIN

We have made around 100 pulls at dyno without any problem with oil pressure. Looks when acceleration is more than 0.7G do not keep the pressure.
But thanks, will test this.

chuntington101

This is how Katech did it on a supercharged z06

https://www.corvetteforum.com/forums...3-1000-hp.html

Juhatee

Is it just longitudinal G-force which makes wet sump LS engines hurt or also sideways action? Is this somehow common for just one oil pan design in LS-family?

It seems very alarming (to all drivers..) if you suck the pan dry in just 2 seconds (according to that log screenshot).

I understand if the oil is escaping to the rear of the crankcase but there's not much room there anyways. Could it be that the oil is making foam in certain conditions? That would surely drop the oil pressure momentarily.

EDIT: If the oil pump volume exceeds the need of oil, all excess oil will exit the circulation via pressure limiting valve. This would be worse with higher rpm and big pump. How will the once ejected oil get back to the circulation fast enough?

EDIT2: If it's still stock-type oil pump, it will be a bypass that circulates oil from pressure side to inlet side so that's not an issue (except for oil being heated during that).

I would make the test GSpeed suggested. I'd also make sure you have as thin oil as possible for the temperature. Thick oils are hard to suck through the inlet pipe and screen with high rpm and on average street temperature. I suppose your bearing tolerances are close to stock which makes thick oils more harm than benefit. Just my 2 cents though.. Never had a 4-digit hp car

Tuomas FIN

Looks the problem is G-force, no any issue with oil press at dyno or "mild" accelerations.
Just noticed, oil level was little low after latest dyno session and tranny failure standing five weeks on lift waiting new. Filled little over one quart over factory line. Catch can came out maybe half quart.

Juhatee

One question about the log picture: The moment you push the throttle, oil pressure drops immediately 40 kPa. That drop happens even before acceleration crosses zero. Why is that?

GSpeed

When I saw that, that's why I made the comment I did. Throttle has no affect on oilp, except in G force. The oil system could care less what happens when you push the gas.

Tuomas FIN

I don't know but made few third gear test pulls on highway after filled oil, didn't check the logs yet but kept anyway pressure over fail safe limit, what is now 300kpa. Heavy traffic so could not make 4th gear pull unfortunately.

inspector12

Well back to your question about the head mounting I was going to tell you I still have my A/C and I kept it with my Vacuum pump mounted in same location with out any issues with the A/C and saw multiple Corvettes running the Aviad setup on vette's with A/C Just's a heads up. And for the comment from Juhatt about your bearing clearances being stock. I highly dought that anyone knowing anything about high HP motors would place stock bearing clearances in it. And I totally disagree with the thinnest oil you can find, and think it should just be the best oil for what your motor and setup is doing etc...GL That tranny looks promising!