Oil temps from time attack
 

Hey Guys,

I have a 25 row z1 setrab oil cooler on my 370z and the temps get to 130+C which is about 266+F after about 5 laps.

I was thinking of upgrading tot he 34 row.

Does anyone else here using the 25 row unit and able to do long runs of 30 mins plus without oil temp issues?

Do you guys think the 34 row unit will solve the issue?

The air temps were fairly high in the high 80's low 90's here in Toronto during the track days.

FYI, even with a 34 row, when you are doing 25-30 min sessions, you will still push 265 deg..... it just won't go past that. That's what I hit regardless of 90-100 deg.....

What's your diff temp?
;)

What i don't know won't hurt me :stirthepot:

Why, is the smoke that I have coming out of the diff vent tube bad?

lol@diff temp, I will kill the stock vlsd and then upgrade.....

Thats the real question. Most people have no idea how hot its getting back there. I put finned Nismo cover which Im sure does next to nothing to cool things but some fins are better than none! Wish somone would make larger diff cover that allowed a little more fluid. I guess cooler is more effective but for me really isnt required. We were shooting mine with gun it was screaming hot. I think thats were we will be seeing most track car failures in cars that dont have a way to cool diff.

350s had high diff temp issues too, its no mystery. Lack of air flow from the pumpkin being mounted so high into the chassis. Soon ill be doing 1.5way diff, diff cooler, Nismo cover, and shorter final drive all at the same time. Should perform much better and rule out rear diff temp issues

Just so you know.... Track guys you are Prob pushin 400f and that's only 10-15 minute runs.
We hit 380 f and that was with a pump and cooler.... and have really worked to get them liveable.
Change that fluid often ..... For sure!

I've quite literally had complaints that my car was burning from other drivers as I passed them, diff fluid smells pretty nasty when it smokes.

I change it every time I change the engine oil. I'm definitely wanting a diff cooler but drilling and tapping the pumpkin for fittings is a PITA.

If someone made a diff cover with the holes already drilled for the cooling lines that would be awesome! Hint hint, nudge nudge, wink wink.

Copy.... Or you could buy one and send it to us... And we could do it for a small fee.
;)
Not only do we run a pump and cooler... But we also have upgraded the fan twice to move more air though our cooling block. Our system sits where the OEM saddle tank was ...on the driers side.... The cooling block is home for trans, oil, and diff cooler.

Huh... Sounds like a simple enough single billet component to consider once the fuel cans are out and about.

Does the 370z borrow the 350z diff cover? I have a 350z cover in the garage, but never stared at my 370s cover.

Covers are different I believe, just slightly.

Edit: Hmm, they are listed as separate part numbers but I'm not sure what the difference actually is.

I'm probably going to lose the muffler can and stick it there, and maybe add a baffle/air guide for more air flow.

yeah thats why i really only do like 3 hot laps right now with no cooler and stock VLSD. im honestly surprised the VLSD lasted this long :icon17: my car wont see the track again till after the new diff and diff cooler setup.

Yep that's temp we got when I pulled into hot pit after 15 minutes on THill 400 on the dot. Ignorance isn't bliss! I use OS Giken fluid with OS Giken LSD it holds up remarkably well. And runs a little cooler but not much. During track days I would just run couple laps on couple laps off to manage heat. Even for time trails that worked for me. But guys who don't pay attention to rear diff heat are going to cook things nicely especially if they don't change fluid.

When I plan longer track days at hot tracks it will be my next mod but my sprints really don't stress rear diff too badly. Temps under 350 degrees mostly.

I see one main problems being lack of fluid capacity in stock diff. But cooler is mandatory for anyone running these cars seriously.

Hi - are you involved with the 370z running in the continental tire series?

I don't know what my diff temp is...thanks for the advice on that. I am running a quaife diff.

So I should change the diff oil how often and what would your recommend I use for oil?

Also, how much cooler will the car run with the 34 versus the 25 row setrab? any experience comparing the two?

Anyone have 35 row they want to sell? :)

I have a time attack event coming up at mosport in a couple of weeks and want to make sure the car runs as cool as possible.

Also on another note, I tried the carbotech xp12 up front and xp10 in the rear based on some advice from z1 motorsports....bad combination...the rears overheat and brake balance goes all to the front. xp12 all around will be a better option.

I'm surprised the 12/10 combo didn't work out for you. I'm running 10/8 with Stillen's brake ducts on the front and it's the best setup I've had yet. This is street tires in HPDE-like stuff though.

If you drive the car fairly hard I would change it after 2-3 track events. Street driving is far less demanding, so about 5000 miles of street. I've used Motul, Redline and even Royal Purple in the rear end. I was using 80W90 but have switched to 75W140 to maintain viscosity at higher temps.

COMSCC? What car class are you registered for? Mosport is a heavy throttle use track so you'll want the most cooling you can get. Wish I was going.

Are you sure? That seems unlikely that you are overheating the rears. Have you used temperature paint to see what rotor temps you have? I had ABS locking up the rear wheels very easily when I used the same compound all around, maybe you could jump up to XP16 if you are running on R-comp tires.

Thanks I am going to put 75w140 in today then.


Ontario Time Attack Series (OTA). I am in the GT1 class. Yeah I have been going to mosport on and off now for about 20 years. It is by far my favorite track. This is the first time with the 370z. My previous cars were a gt3 and a c6 z06 and a long time ago - miata :) I think the track record in gt1 is in the 1:35 range, so we will see how I do.

Yeah, I am sure :). This was happening on a fairly small technical track (Toronto Motorsport Track) with not much time for cooling brakes. When I had the x12 on the front and x10 on the back the balance was ok at the beginning of the run, but towards the end of the run the front tires would lock up too easily because the rears were no longer applying enough braking force.

I happened to have some x10 front's so I put those on and the car maintained a better braking balance through the run, but I could not brake as hard without feeling the front brakes give up towards the end of the the braking zone at the end of the longest straight.

I use to run x12/x10 on my c6 z06 without any issues, but that car is lighter than the 370z and it does have brake cooling vents for the rear.

I created my own brake ducting for the 370 because the stillen kit was not available at the beginning of the season. I will be ordering the stillen kit just to get the mounting plate for the rotor so that the hose will pump air more towards the center of the rotor. The solution I created involved cutting a hole in the dust cover and riveting a flange to it. But the air is pushed more on the outer portion of the rotor than the center.

Those times are similar to our (COMSCC) current class records for STGT and SPB set back in 08. We fully expect the records to fall this time around as cars have got a lot faster, and the last couple of times we have been there it was cold and rainy. So if you feel like doing back to back time trials at Mosport you are more than welcome to sign up :)
July 30-31 COM Sports Car Club

I find it interesting that you are overheating the rear first because I normally get the reverse effect. I tend to overheat the front pads and then the rear starts to lock up. The Stillen brake ducts certainly help, but they are a little undersized to be ideal. The effect is positive, just wish they were 3" and not 2" as it would be over twice the air volume.

id look into a upgraded radiator also if your going to be on track during the summer. our are very thin. I was on track last weekend in 105 degree weather. My oil was soilid with my 34 row cooler, but water started to get hot

LOL....I have seen a few cars where the diff temps get hot enough that the magnet on the drain plug literally mushrooms out. You end up having to pull the diff to get the cover off to drain the fluid.

That is probably one of the old Nissan tricks that they pull with the part numbers from time to time. The covers are identical from what I recall. Just an example, Nissan Motorsports lists the same part number for the Finned NISMO Diff Cover (which is really not a NISMO part at all, but a Middle Eastern/Austrailian spec part) for all VQ platforms. They just re-number the OE boxes....

My magnet literally melted off, I guess I got lucky that it didn't get stuck!

Good to know!

Thanks for the invite...I don't think my car could handle 4 straight days of track abuse :). But maybe I will drop by.

I put 3" hose on my car. Maybe I won't get the stillen kit then :)

changd the diff oil
 

changed the diff oil today on a my quaife - the oil smelled really burnt :) Smelled terrible.

It had 5 track days on that diff. I will be changing much more frequently and also will be investing in the GTM diff cooling kit.

Cheers.