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Old 10-18-2021, 11:29 AM   #301
biknman
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Member#: 47915
Join Date: Nov 2003
Chapter/Region: MAIC
Location: Parkville, MD
Vehicle:
1996 GC8 FFR818r
19 Forest Touring

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Congrats!
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Old 10-20-2021, 04:08 PM   #302
Sgt.Gator
Scooby Newbie
 
Member#: 374688
Join Date: Nov 2013
Chapter/Region: NWIC
Location: Bend Oregon
Vehicle:
2005 STI
WRB

Default Enduro Tech Recap

Enduro Tech Recap. The air temps were foggy and a bit chilly in the morning, 55 degrees. They rose to 68 degrees in the afternoon. Full sun.
A few things we learned in the Enduro:

Pros:
Coolant temps are not an issue at all. The oem gauge stayed under halfway the entire time. This was confirmed on our AP data.

Oil Temps were almost too cold (more below). They stayed at 185 for a long time, eventually rising to 200-210 for the race. Even 6 hours in we were still at 205 or so.

Cons:
The rear diff has no cooler and needs one. It stayed at 240+ most of the race, hit a high of 250F. We'll be adding a pump and cooler over the winter.

The CV axle failed in the outer front passenger joint. This is a classic Subaru issue because of the nearby up & down pipes. The heat also affects the hub life. We have done extensive exhaust heat wrap on those pipes but it's not enough for endurance racing, especially at tracks like PIR in non chicane configuration, the WOT is a long stretch that blasts heat out the pipes. We are going to figure out a way to add an additional air intake ducted to the CV/Hub area on both front axles. Hopefully more cool air blowing in the area will solve this problem.

The DS scavenge is still not maintaining solid vacuum above 6,500 to 7,000 RPM. We have a one way valve on the crankcase vent that is normally closed under vacuum sending all the blow by to the DS tank to be vented. Again, due to the long straight, and shifting at 7K, the vacuum goes slightly positive, opening the valve and sending blow by gases to the catch can. If you keep doing this the catch can eventually overflows making a mess. However if we shift at 6K there is no problem at all. And we can occasionally shift at 7K if we are trying to pass a car and the brake zone for a corner is coming up. But routine shifting at 7K is the problem.

This also causes the oil temp to skyrocket. In the practice session we overflowed the catch can and hit 260F oil temp.

We think the scavenge pump is being overdriven and starts to cavitate at 7K. Unlike most traditional DS scavenge pumps that run at 1/2 crankspeed, ours runs at full crank speed+ off the A/C ring on the crank pulley. If that is the issue then adding more scavenge sections to the pump won't help. We'll do some testing this weekend at ORP to verify if this is what is happening.

The long term solution is a DS system like the Dailey Engineering and RCM systems, or a drive mandrel off the front of the crank like the former Cosworth system, or a mandrel attached to an ATI damped crank pulley which is used in many V8 applications. Or find a damped underdrive crank pulley, but neither ATI or Fluidamper makes one for the Subaru EJ. There is an underdrive crank pulley on the market but its not damped and we want to avoid that in a endurance race engine.

And we want to keep the STI and 818R as similar enginewise as possible. There's very little room between the front of the engine and the firewall due to the mid engine configuration.

However it's not a huge deal in the real world of endurance racing. If you want your engine to survive for 8 hours, or 25 hours, shifting at 6K is a very good idea anyway! And our EJ257 has a ton of TQ at 4K-4.5K so it's really not a problem.
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Old 10-21-2021, 10:11 AM   #303
Scargod
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Member#: 260314
Join Date: Oct 2010
Chapter/Region: NESIC
Location: S central CT, New England
Vehicle:
2007 STI
silver gray metallic

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Thanks! All great information!
I've been repacking my bearings/CVJ's with high temperature grease. Are you doing that?
I've been very happy with the engine setup on my '08 STI. I've a Daily system sitting here and it's hard for me to justify putting it on the engine. I've now run around 62 hours on this engine and I regularly take it near 8K. Nothing unusual with oil temps. I frequently hit/sustain 1.3G's but only briefly get to 1.5 with the 285 Hoosier R7's.
It's coming apart in the coming week for a refresh, so stay tuned. On 10-18 I was out hammering it and I saw no signs of it pooping out!
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Old 10-21-2021, 04:03 PM   #304
Sgt.Gator
Scooby Newbie
 
Member#: 374688
Join Date: Nov 2013
Chapter/Region: NWIC
Location: Bend Oregon
Vehicle:
2005 STI
WRB

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We've been using OEM CV axles on the STI, untouched unless a boot is failing. We're considering the DSS axles with the Road Race option. And have oem for spares. As you said, we should repack the oems with high temp grease. I am going to figure out a way to blow more air on the CV & Hub.
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Old 11-06-2021, 12:22 PM   #305
Homemade WRX
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Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Mooresville, NC
Vehicle:
96 3MI Racing
search FIRST, then PM!!!

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Nice!!
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Old Yesterday, 05:49 PM   #306
Sgt.Gator
Scooby Newbie
 
Member#: 374688
Join Date: Nov 2013
Chapter/Region: NWIC
Location: Bend Oregon
Vehicle:
2005 STI
WRB

Default Cascade Enduro 8 Hour Video up!

We made this relatively short video of our experience at the Cascade 8 hour Enduro. Hope ya'll enjoy it!

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