CK_32

iTrader: (1)

So for the past year my oil pressure sensor went out on my Z and would just show 120psi no matter what on oil.

im on a Boosted DE making 450whp.

About 6 months ago I hit Autoclub Speedway and was overheating every lap. Pretty sure I got an air pocket in my coolant system.

I got the sensor replaced before my last autox session. Temp was fine. But after my 3rd run I noticed my oil pressure go from 30 psi to 20 at idle.

After my 7th run I was around 5psi oil pressure idle. 30 under load.

im thinking instead of 5w-30 bump to 10w-40. This is a garage kept track car. 0 street use accept to drive to the autox event 5 miles away.

after the ride home it’s back to normal temps. So it’s the oil viscosity not my galleys. I hope anyway haha

No oil cooler, no breather. But we’re talking oil here. Remember I’m boosted, so I’m making way more heat than N/A.

i8acobra

iTrader: (6)

If it's a track only car and you can let it idle in the pits to warm up to operating temp before driving, ditch the multi-weight oil. Multi-weight was designed to allow for people starting their cars and driving off without ample warm up time. To accomplish this, additives are used to make the oil act like different viscosities and different temps. These additive reduce the lubricity of the oil because the additive molecules displace oil molecules. For track use, use straight weight oil. Choose 30, 40 or 50 weight based on ambient and operating temps. I run NMCA West at AutoClub, so I'm familiar with the temps in Summer. It's hot. Not Vegas hot, but still hot. For the Summer season, I'd start with straight 40 weight and see how your oil pressure and temps look. Adjust from there. Just always remember to let the car come up to temp before driving.

dkmura

iTrader: (64)

As a counterpoint, I've had good success running a multiweight lubricants in my SCCA race Z. I live in Colorado, and while I race throughout the country, Mobil 1 0-40 FS continues to deliver good UOAs for my VQ35HR. No experience running FI at race tracks, as I can barely afford tires, brakes and race fuel as it is.

Escobar

iTrader: (27)

great points, I would highly recommend running a aftermarket radiator and a oil cooler for a turbo track car. As far as oil goes, ive been running valvoline VR1 10-30 with good success. I like what cobra said, Im gonna try that next time, SAE 30 or 40. Side note, how long have you been boosted on stock block? Im at 8 PSI now, considering going up a bit

CK_32

iTrader: (1)

solid point. Honestly didn’t even know they offered straight weight oil. Ima look into that. Only thing about letting idle is we have timed runs in SCCA. It much time to kill between runs with out slowing the event.

CK_32

iTrader: (1)

Yea fully stock. I’m running 11lbs but my Z only has 50k miles and was taken care of pretty well for most of its life. I’m surprised it’s taken this much abuse at this power. I wouldn’t go more than 10lbs on a stock block if you want it to last.

Plan on building the block after I finish a couple other projects I’m working on.

i8acobra

iTrader: (6)

When I did track days with my Evo, I'd start the car before the driver's meeting.

Escobar

iTrader: (27)

yea I think I'll stick with 8 PSI and just beat on it until something fails.

jhc

@CK_32
IMHO the oil pressure senders in this line are Notorious for failing quickly. Do yourself a favor and change the sender, you'll have an accurate read and sweat less.

GreyZ

iTrader: (2)

This is also what I run in my Boosted Z. I have had zero issues with it even in heavy use. I do not have data after going turbo though actually on track. Hopefully soon.