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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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05-14-2020, 09:16 PM | #1 |
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Transmission issue opinions requested
I read a number of posts about the benefits of changing the transmission gear oil. When I changed the oil I did have some metal on the drain plug as it said I would. I added three quarts of Lucas synthetic gear oil and thought I was all set.
The issue is now when the transmission is cold first tot second, second to first changes are very notchy. To the point of difficult shifting. Once it warms up it is much better. Additionally when I'm on the power and pulling hard it becomes difficult to shift. I have the Edelbrock SC so pulls are harder than stock would be. Why would this have happened when changing the gear oil? Would changing back to the stock oil or another brand solve the problem? |
05-14-2020, 09:24 PM | #2 |
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By mentioning hard pulls with your bad-ass Edelbrock SC, all I read is "I have absolutely no idea how a transmission works."
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05-14-2020, 10:10 PM | #3 |
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I use Motul Gear 300 and no issues. It feels better in cold starts too than the stock oil.
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05-14-2020, 10:27 PM | #4 |
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My opinion is that transmission shifting issues are more from flex in the drivetrain mounts. Stiffen the transmission and differential mounts with whiteline parts.
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05-14-2020, 11:13 PM | #5 | |
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Quote:
Also, this is why all modern oils are multi-grade. The lower the number, the thinner on the viscosity scale it acts at a specific temperature. 0W-20 oil acts as a 0 weight at "low temperatures" (These are per-grade, but usually around -35C to -40C), which is going to be more viscous than its "operating temperature" grade (100C). Gear oil is usually 70W-90, so it's pretty thick, but a 70 weight at -35C is still going to be pretty thick compared to a standard 70 weight at 100C, it will just be slightly thinner than a 90 weight at -35C, just the same as the 90 weight side will be thicker than a standard 70 weight at 100C. |
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05-15-2020, 01:29 AM | #6 |
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But the only way to shift is with the entire driveline completely unloaded. There is literally zero torque applied at that moment.
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05-15-2020, 07:36 AM | #7 |
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05-15-2020, 07:37 AM | #8 |
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05-15-2020, 07:44 AM | #9 | |
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Quote:
I don't drive it hard until it is warmed up. Sorry for the misunderstanding. I understand the viscosity and temperature relationship. My "cold transmission" comment isn't necessarily referring to the outside temperature but more to the temperature of the transmission itself. This is a comparison to how it felt with the oil I just drained out of it. Both of the oils were/are of the same viscosity rating. Thanks |
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05-15-2020, 10:18 AM | #10 | |
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Quote:
If the OP got 3 quarts of oil in his trans, it wasn't level. It takes 2.3 quarts, link to manual in Ultra's sig
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05-15-2020, 10:59 AM | #11 |
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I'm seconding NoHaveMSGs experience. Better oil (obviously filled to right amount, 3qt is overfill, which just like underfill may worsen shifting) & stiffer tranny bushings improved shift feel, but hard to get into 2nd when gearbox is cold is still there. I just accept that as given and don't see myself limited by that during first 5 minutes of driving for gearbox to warm up when one shouldn't push it anyway. Yes, it would be nicer if that behavior hadn't been there, but as otherwise gearbox works fine, and it's throws are rather short and feel precise relative to most cars i've driven before, so i'm ok with that.
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05-15-2020, 12:20 PM | #12 | |
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Quote:
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05-15-2020, 02:45 PM | #13 |
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My point is that if you truly want to learn about the transmission, humility is your greatest asset. Do you want to learn about your transmission, or are you here to have your preconceptions validated? If it's the latter, I'll kindly excuse myself.
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The Following User Says Thank You to Ultramaroon For This Useful Post: | Spuds (05-15-2020) |
05-15-2020, 03:07 PM | #14 |
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If you believe someone needs knowledge, then why did you offer ridicule instead of information.
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