Transmission fluid additives

[timatt]

I am getting ready to take my 91Q in for a transmission flush and will replace the fluid with Mobil 1 ATF. I've seen reference on this forum to 'BG' additives which are evidently recommended. However, I cannot seem to locate this topic using the forum search. Can someone tell me the recommended additives (I believe there are two) and the respective amounts of each.Thanks

timatt

[Q45tech]

BG Quick Clean for Transmissions is used for 15 mintes just prior to the flush exchange to free up the varnish and friction materials into the ATF [by running the car off the ground in all the gears including reverse to speeds] so they can be removed with the old ATF.

BG Conditioner is just a group of extreme pressure additives [Zinc organo phosphates] to protect the planetary and pump gears.

The future critical part is keeping the ATF temperature below the 200F range to extend ATF and internal seal life..........use the color of the ATF to tell you what is/has happened.

[elwesso]

Tim.. I think your thinking of Lubeguard Red and lubeguard black..... Q451990 posted a thread about this thats just down this page..... Check it out!

[timatt]

Wes:

You are right. Any idea where I can get this stuff?

tim

[VA99Q45]

I brought mine at NAPA.

[maxnix]

Differences between Lubeguard Red and Black

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"Red is synthetic sperm oil (can't kill whales anymore) and is used to smooth out the final engagement shock (lock-up.) It is a friction modified that lowers the coefficient of static friction relative to the dynamic friction. Dynamic is when the clutch faces are slipping past each other--static is when they are stationary.Black lubeguard increases static friction and dynamic friction coefficients, raising the locked-up torque handling capacity of the clutch unit (results in 'firmer' feeling shifts)

The Q45 TCU/ECU backs off on torque during the shift to give smooth shifts. For a given transmission condition/temp/oil condition, one can 'tune' the fluid characteristics somewhat. Factory settings are a compromise between smoothness, durability, and performance.Ideally you would get a continuous flow of driveshaft torque under all throttle and speed conditions, with no noticeable jerk or sag. Hard to achieve in this world.

You want to be careful with harsh shifts--they stress the metal parts and clutch faces (and driveline parts) more than intended. This is not to say they will fail (right away), but incremental wear/damage is unavoidable with hard shifts."

I am proabably really dumb, but I run no additives in any of my 3 Q45 transmissions. Shifts are crisp, but not jarring, but all were flushed while fluid was in pristine condition. Maybe I am just not sensitive enough to tell what they need.

[elwesso]

Then I must ask... Why does the valve body modification which gives us firmer shifts say that it increases transmission longevity...

[AlabamaDan]

Is a flush something that can only be done at shop? Can't be done at home?

[maxnix]

Then I must ask... Why does the valve body modification which gives us firmer shifts say that it increases transmission longevity...

My undeducated guess is that at high power inputs it reduces the shift time, and thus slippage and thermal increases in the ATF.

The Infiniti (and other luxury car maker's) strategy of reducing timing advance at the moment of shift allows for a hisft at lower power, extending transmission life, but increasing shift time and decreasing performance.