|
|
|
|
Thread Tools | Display Modes |
08-02-2004, 10:11 AM | #1 |
Scooby Specialist
Member#: 14723
Join Date: Jan 2002
Chapter/Region:
South East
Location: Fort Myers, FL
Vehicle:2008 Unlimited AWD Redline Time Attack Champ |
STi + Track Day = Overheating Rear Diff. = Help
any recommended rear diff fluid to keep temps down? any other ideas?
about 20 min. of track time it brought up the warning light and then the fluid never seemed to cool down. after that it was every 10 minutes and i would let the car sit for about an hour. i'm guessing this will just get worse w/ more HP. luke
* Registered users of the site do not see these ads.
|
08-02-2004, 10:12 AM | #2 |
Scooby Guru
Member#: 7492
Join Date: Jun 2001
Chapter/Region:
South East
Location: Hotlanta, GA
Vehicle:No race cars www.tomhoppe.com |
Motul Gear 300.
-Tom |
08-02-2004, 10:44 AM | #3 |
Scooby Specialist
Member#: 14723
Join Date: Jan 2002
Chapter/Region:
South East
Location: Fort Myers, FL
Vehicle:2008 Unlimited AWD Redline Time Attack Champ |
this stuff?:
MOTUL GEAR 300 RACING 75W90 or do they make a LSD version like the service manual recommends? STi model Gear oil LSD (Part No. K0904AA080) or equivalent i'm guessing you'll still get the warning light, but you'll feel more comfortable ignoring it? luke Last edited by lukerussell; 08-02-2004 at 11:10 AM. Reason: add on |
08-02-2004, 12:26 PM | #4 |
Scooby Guru
Member#: 26361
Join Date: Oct 2002
Chapter/Region:
TXIC
Location: Sugar Land (Houston), Tx
Vehicle:My shenanigans are cheeky and fun |
Check the connections on the rear diff too. The grounding wire got knocked off mine and it caused the rear diff warning light to go on, since Ive plugged it back in its never come on during a track day.
|
08-02-2004, 12:31 PM | #5 |
Scooby Specialist
Member#: 25905
Join Date: Oct 2002
Chapter/Region:
SCIC
Location: San Diego, CA
Vehicle:2003 Silver Wagon Tuned with Enginuity |
Any synthetic fluid will reduce temps by a good amount. They can reduce temps by up to 20-30 degrees in some applications, not sure how much it will reduce them in the rear diff of the STi. Synthetic fluids also reduce thermal breakdown a lot better than dino oils, so you may feel more comfortable ignoring the warning light for short periods of time should it come on.
|
08-02-2004, 02:09 PM | #6 |
Scooby Specialist
Member#: 42478
Join Date: Aug 2003
Chapter/Region:
South East
Location: Atlanta, GA
Vehicle:2004 WRX STi White/Gold |
Some performance Japanese companies make a replacement diff cover with larger heat sinks to dissipate the heat faster.
Syms comes to mind...... |
08-02-2004, 02:15 PM | #7 |
Scooby Specialist
Member#: 42478
Join Date: Aug 2003
Chapter/Region:
South East
Location: Atlanta, GA
Vehicle:2004 WRX STi White/Gold |
Some performance Japanese companies make a replacement diff cover with larger heat sinks to dissipate the heat faster.
Syms comes to mind...... http://www.syms.jp/products/impreza/gda/clutch.html ¥36,000 |
08-02-2004, 02:32 PM | #8 |
Scooby Specialist
Member#: 14723
Join Date: Jan 2002
Chapter/Region:
South East
Location: Fort Myers, FL
Vehicle:2008 Unlimited AWD Redline Time Attack Champ |
sweet diff cover, i'd look like all those racing m3's that were at the track. i'll check into that. in the meantime, motul offers a LSD specific oil:
MOTUL 90 PA LIMITED SLIP DIFFERENTIAL FLUID Specially designed for limited slip differential and hypoid gear rear axles, this high performance mineral gear oil is perfectly suited for use in racing cars, 4 x 4's and passenger cars. If you have aftermarket clutch type LSD's (Nismo, KAAZ, Cusco, Mazda Comp. etc.) this oil is meant for your clutch type LSD. API GL5, MIL-L-2105-D, ZF TE ML. MOTUL 90PA Limited Slip Differential Oil - 2 Litre 3181/CZ …….. $14.00 vs. the synthetic stuff: GEAR 300 75W90 100% ESTER SYNTHETIC Motul's highest quality 100% ESTER BASED synthetic 75W90 gearbox oil. Designed for today's high performance vehicles, and all out race cars. This lubricant is virtually unshearable. Its stability at high temperatures make it ideal for extreme conditions. Many endurance professional race teams swear by this oil. Designed for transmission gearboxes and rear axles. API GL4 and GL5/MIL-L-2105C. GEAR 300 75W90 100% Synthetic Gear Oil - 1 Litre 3178/CZ …… $13.00 Which one is right for the STi for the track? luke |
08-02-2004, 02:40 PM | #9 |
Scooby Guru
Member#: 6713
Join Date: May 2001
Chapter/Region:
TXIC
Location: Houston TX USA
Vehicle:2007 Prius brown |
if you are starting to beat on the car that hard at track days you might look into getting an oil cooler too, and gauges to closely monitor water and oil temps.
might even need to address transmission cooling. high power cars have high power needs when you open track them |
08-02-2004, 03:23 PM | #10 |
Scooby Specialist
Member#: 25905
Join Date: Oct 2002
Chapter/Region:
SCIC
Location: San Diego, CA
Vehicle:2003 Silver Wagon Tuned with Enginuity |
Looking at the specs, the Gear 300 is designed for gearboxes (although can be used for rear ends as well), the 90PA would be more appropriate for the rear end of the STi and it's LSD.
|
08-02-2004, 03:47 PM | #11 | |
Scooby Specialist
Member#: 3184
Join Date: Dec 2000
Location: Albuquerque, NM
Vehicle:00 Grp N Wrx STi, +99 V6 STi, |
Quote:
Doesnt the warning light trigger the diff to run open mode. |
|
08-02-2004, 04:15 PM | #12 |
Scooby Specialist
Member#: 738
Join Date: Jan 2000
Chapter/Region:
MWSOC
Location: Southern Ohio USA
|
Luke, I'm assuming your car isn't stock?
What track is it heating up os much on? I did Mid-Oho last year and the outdoor temps were 70. WE ran 12 25 min sessions that weeekend without any problems. I'm going again in 1 month where the temperatures might be much hotter. Just wondering how hot the outdoor temps are and how hard you are running it. Davis |
08-02-2004, 04:36 PM | #13 |
Scooby Specialist
Member#: 14723
Join Date: Jan 2002
Chapter/Region:
South East
Location: Fort Myers, FL
Vehicle:2008 Unlimited AWD Redline Time Attack Champ |
i drive the car as fast as it will go, so i don't take it easy on anything. it was sebring and 95 degrees, hot. i've only made suspension mods, no engine or HP mods.
does anyone know at what temp the rear diff temp light goes on at and if it does open the lsd? one other tidbit: i had the muffler and midpipe replaced w/ a cheesy 90 degree pipe to throw exhaust towards the ground. (i ordered a catback but it didn't show in time, i can't run w/ the stock muffler because i can't hear anything and keep bouncing off the limiter). anyway the cheesy pipe ended up straigtening out so it was throwing hot exhaust in that general direction. all that said, does anyone else concur that the motul 90PA may be better than the gear 300? |
08-02-2004, 06:12 PM | #14 |
Subtly Outspoken
Moderator Member#: 238
Join Date: Sep 1999
Chapter/Region:
MWSOC
Vehicle:OG05 STi 51E |
MOTUL is bringing a new Syn gear 300 out that is especially for LSD 6 spds...I am supposed to have it in by the end of the week...and will let you know the prognosis...
Better heat disipation, Better oiling qualities...and again...Ginetically designed for the 6spds... Bill |
08-02-2004, 08:50 PM | #15 |
Scooby Guru
Member#: 177
Join Date: Aug 1999
Chapter/Region:
NWIC
Location: Austin, Texas, USA
Vehicle:The 93 W/EJ20K-sold Subaru-less :( |
mmm gin
sorry i couldn't resist |
08-03-2004, 08:07 AM | #16 | |
Scooby Specialist
Member#: 14723
Join Date: Jan 2002
Chapter/Region:
South East
Location: Fort Myers, FL
Vehicle:2008 Unlimited AWD Redline Time Attack Champ |
Quote:
luke |
|
08-03-2004, 11:22 AM | #17 | |
Scooby Guru
Member#: 456
Join Date: Oct 1999
Chapter/Region:
NWIC
Location: Redmond, WA, USA
Vehicle:2008 Forester XT Steel Gray Metallic |
Quote:
Have you checked tire pressures are even? This seems kinda odd to me. Are you pushing very very hard in corners, ie beyond minimal slip? (ie sideways) So the exhaust was pointing at the diff? That's bad. You know you want to keep that away from bodywork too, lots of heat will be coming out of it. Glenn PS I've not heard about this on any STis including Subaru's test cars (which have been tracked), so you either have a problem or your exhaust is the issue. |
|
08-03-2004, 11:36 AM | #18 | |
Scooby Specialist
Member#: 738
Join Date: Jan 2000
Chapter/Region:
MWSOC
Location: Southern Ohio USA
|
Quote:
I try to keep my ears open on drivers who track their STi's, especially stock nes. I haven't heard of anything like yours before. A good friend of mine tracks his car at HPDE weekend/events 12 times a year. He has had no problems with his car. Bullet proof. However luke IS running in conditions that are very hot and humid. Maybe if you are sliding around everywhere for a long period of time the diff would get excited? Hard to say. I think you gotta keep an eye on the exhaust issue. Let's us know if the newer oil helps or anything else you experience at the track. |
|
08-03-2004, 06:24 PM | #19 |
Scooby Guru
Member#: 1594
Join Date: Jun 2000
Chapter/Region:
MWSOC
Location: Carson, IA
Vehicle:1999 2.5 RS 2002 Legacy |
Consider Amsoil as well. I use their Series 2000 race synthetic fluids in my transmission and the regular synthetic in my rear differential.
There is a fellow STi owner as well as some more WRX guys running the same set-up. |
08-04-2004, 01:37 PM | #20 |
Scooby Specialist
Member#: 14723
Join Date: Jan 2002
Chapter/Region:
South East
Location: Fort Myers, FL
Vehicle:2008 Unlimited AWD Redline Time Attack Champ |
i don't think it's the diff, it was the hot exhaust. it went from pointing down to pointing straight back and melted a bunch of plastic and electrical tape. but i think i'll swap out the diff oil to be safe.
luke |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Overheating Rear Diff?? | Rallycarperson | Transmission (AT/MT) & Driveline | 10 | 08-24-2011 11:54 AM |
Rear diff help. Not sure if it's locked, welded, or upgraded. | my3awds | Transmission (AT/MT) & Driveline | 0 | 06-05-2008 01:32 PM |
96 outback rear diff help! | TomRitt | Transmission (AT/MT) & Driveline | 5 | 01-07-2007 08:00 PM |
Replacing WRX box/rear diff with STi 6 spd & rear diff. | renhoek | Subaru Conversions | 3 | 05-14-2005 01:53 PM |
rear diff help wrx 2002 | mikaust | Transmission (AT/MT) & Driveline | 0 | 09-07-2003 04:56 PM |