01-14-2020, 04:43 PM | #1 |
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Tuned S55 motors with serious track time
Gang, I'm looking to flash with ECUTEK soon.
For those of you with 500-550 WHP tunes how has the drive train help up? Turbos? Engine, Clutch etc? THX, HAZMAT
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01-14-2020, 05:10 PM | #2 |
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From the comments in the spun crank hub threads it seems like you get a stage 2 tune and you spin the hub in the next few track outings
If you want to tune and do heavy track use I suggest you use a low torque option, like what ESS offers or what BM3 allows you to program (20% torque limit by gear) I track my CS heavily but the engine/exhaust are completely OEM |
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01-14-2020, 05:24 PM | #3 | |
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If you are tracking the car with more than stock power, I highly recommend getting a pinned crank hub
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01-14-2020, 06:00 PM | #4 | |
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Good to see you again Chet. All those years on the EVO Forums... I'm looking to see if anyone has extensively tracked their S55 with 20-22lbs of boost from a reliability standpoint and also any cooling issues.. Roughly a stage 1 tune...
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01-14-2020, 07:00 PM | #5 | ||
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The CBC does help, but its still possible to spin the hub.
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01-14-2020, 07:46 PM | #6 |
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Yes I know that but its good insurance vs OEM...
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01-15-2020, 09:20 AM | #7 | |
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The car is has treated me very well, I daily drive it with almost 60K miles. I've done 30 min sessions in 90+ degree weather and have never once had a cooling issue. |
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01-15-2020, 12:47 PM | #8 | |
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A little concern around spinning the crank hub. On the 150mph -> 80mph braking zone at my home track I try not to bounce off redline with downshifts. I've found I can sneak in a downshift mid-corner after trail-braking with the DCT, with sport+ the rear would wiggle a little but not to the point of risking a spin. AFAIK manuals weren't as susceptible to downshift induced crank hub spins, probably due to drivers being a bit more cautious about bouncing off redline with the downshift. |
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01-15-2020, 02:52 PM | #10 |
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01-15-2020, 05:36 PM | #11 | |
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many thx
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01-15-2020, 10:05 PM | #12 | ||
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I've found when driving on track (as many others on this forum have reported) that when in MDM, the rear feels floaty/loose under heavy braking, but the rear feels totally planted with very heavy braking with DSC fully off. |
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01-16-2020, 11:56 AM | #13 | |
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MDM was complete trash. The car would flash the traction control LED on the 3->4 and 4->5 upshift in sport+ on a slight downhill straight. Forget trying to roll in to the throttle mid-corner, it aggressively cut throttle every time. |
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01-16-2020, 04:29 PM | #14 | |
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On topic, my recollection is the heaviest track users on the forum like Canaut and Maynard have stock engines. I think masterP and MasterC17 and other posters had heavy mods on suspension but also stock drivetrain. Long story short OP, my recollection is the bulk of heavy user data we have on the forums is on stock drivetrains. |
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01-16-2020, 05:05 PM | #15 | |
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01-16-2020, 06:11 PM | #16 |
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I've tracked my DCT M4 with an E85 tune making 570whp/tq without any issues. Over 15 track days and daily driven. The only effects were increased consumption of plugs/injectors/coil packs. No crank hub fix or cooling mods. I never worried about aggressive downshifts or spinning the hub. I kept up on maintenance and took care of the car in hopes it would take care of me. Thankfully it did. To my knowledge, the GT4 race cars are running without crank hub fixes without problems, so why would I need one?
My two cents...spend the money on a custom tune specifically made for the track. Let your tuner know you plan to torture the car and dial things back. Even with the huge increase in power over stock, I actually had less traction issues with my custom tune on the street and track than I did stock. The powerband was so smooth and easy to drive at the limit. The car will overheat on long straights or high power circuits. Most notably at COTA in 90+ degree weather, Laguna in 90+ degree weather down the start/finish straight and Auto Club in 80+ degree weather down the long roval straight. I've severely tortured the car and done multiple 30-minute sessions with the car overheating, and it limiting power/revs nearly the entire time. I forgot exactly what pieces they were, but the only consequences were melted wires and o-rings. We replaced them, and the car ran continued to run perfectly after. It's expensive to run these cars at their limit but well worth it. |
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01-16-2020, 06:29 PM | #17 | |
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01-16-2020, 07:08 PM | #18 | |
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"The car is quoted at "above 431 hp" using the red power stick, which is both the lowest level available and the one used for IMSA Continental events. The silver stick, which is next up, is currently used in Pirelli World Challenge. I’ll be driving the car with the gold stick, which is the Goldilocks choice. Move all the way up to the top-flight black stick, and you’re probably illegal in any series anywhere—but you’re also close to 500 horses." https://www.roadandtrack.com/new-car...-car-on-track/ |
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01-16-2020, 07:43 PM | #19 |
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01-17-2020, 12:37 PM | #20 | |
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So you're looking at 40-60 minutes of track time, with only a quick stop to change drivers and refuel. Then a 20-30 minute break until the car would go out again for the next two sessions. That's 5 hours of track time in one day, and I was the opposite of easy on my car. For me, I think it speaks volumes to how capable the car is. 5 hours of steady abuse is no joke. |
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01-17-2020, 12:46 PM | #21 | |
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01-17-2020, 01:13 PM | #22 | |
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So people shouldn't be surprised those engines don't have many issues, the same as the GTS doesn't have many issues either. I'm pretty sure the stupid, useless torque hump at 3k rpm from highly tuned S55s is responsible for most of the hub issues
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