Question to Qsiguy

[youngq45r]

on a previous thread you said "Maybe your dropping resistor is disconnected or bad. When that's disconnected it shifts much harder because it gives full pressure to the solenoids in the transmission...from what I understand. I disconnect mine on purpose when I want it to shift harder. Planning on wiring it to a WOT switch so it is disconnected when I'm on it hard." I went throught the FSM and couldnt find that. is there another name? Maby you, or somebody else, has a diagram or something? Also, any bad side affects to doing this? I Miss the hard shifting of my 91'. thanks

[maxnix]

Just added 6 oz. of Lubeguard Red to mechanically exchanged M1 as opposed to straight M1. After reading TexasOil's and Q45tech's posts on modifying the shear porperties of the fluid, I realized that the crisp shifts were perhaps not optimal. Now shifts are just as fast, but very much smoother without the 2-3 laziness at part throttle I had before.

There is a reason Nissan programmed the TCU to retard timing just before shift. Part was smoothness of feel, the other was transmission longevity. One should consider the consequences of modifying the shift sequence carefully.

[youngq45r]

so your saying, when i change my oil and filter, add the lubeguard red with the M1 fluid?

[Haitian_King]

Just added 6 oz. of Lubeguard Red to mechanically exchanged M1 as opposed to straight M1. After reading TexasOil's and Q45tech's posts on modifying the shear porperties of the fluid, I realized that the crisp shifts were perhaps not optimal. Now shifts are just as fast, but very much smoother without the 2-3 laziness at part throttle I had before.

There is a reason Nissan programmed the TCU to retard timing just before shift. Part was smoothness of feel, the other was transmission longevity. One should consider the consequences of modifying the shift sequence carefully.

So the addition of a 1st Gear start TCU to a 92 was a bad move? I understand about the Lubeguard, but the shift sequence modifications are what I'm lost on.

[qsiguy]

Here's the thread that I went into more detail.

zerothread?id=301493

If you wire it to a WOT switch it would be pretty safe I think but do it at your own risk. It's obviously there for a reason. Maybe it's just for smoother shifting but it's certainly going to be harsher for the transmission. I can't say if the slow, slipping shifts or the harder shifts with the resistor disconnected are worse for the transmission. I will be wiring up mine to be disconnected upon WOT and maybe above 3 PSI of boost as well.

You will most likely get the "Transmission Malfunction" warning on the message center if you do it.

In the FSM you can look at page AT-35, AT-36, AT-39, and AT-82 for info, diagrams, and images.

By far the easiest place to find the wire to disconnect is right at the TCU in the driver kick panel. It's the 2nd one down on the right side, a Pink w/blue stripe. Here's a pic of mine already cut.

[heywier427]

so all you would do is mount a single stage spring switch under the gas pedal to depress at wot.

cut the wire at the ecu, loop it to the switch and reconnect to the ecu.

simple.

[maxnix]

so your saying, when i change my oil and filter, add the lubeguard red with the M1 fluid?

No, when you mechanically exchange the ATF.

REad Q45tech's and TexasOil's posts on Lube Guard.

[maxnix]

So the addition of a 1st Gear start TCU to a 92 was a bad move? I understand about the Lubeguard, but the shift sequence modifications are what I'm lost on.

No, not at all.

The TCU intiates a sequence that includes retarding timing during a shift until the next gear is engaged.

Another reason why acceleration times are a little dumb as eliminating this sequence will decrease shift times and increase transmission maintenance. It's all about trade-offs and intended use.

[Q45tech]

Without the ~~ <1.0 sec of engine retard and progressive ramp up it is doubtful that a RE4 would last 10,000 miles with agressive WOT shifts.

[qship96]

Just another example of why only the foolish here think they can outsmart the engineers who designed the machine

A little knowledge is a dangerous thing, and many dont realize they know JUST enough to do, recommend, or endorse modifications that ultimately will destroy what they think they are improving

[maxnix]

What's scary is how much lighter duty the RE5 is!

[qsiguy]

Just another example of why only the foolish here think they can outsmart the engineers who designed the machine

A little knowledge is a dangerous thing, and many dont realize they know JUST enough to do, recommend, or endorse modifications that ultimately will destroy what they think they are improving

I added my disclaimer in my previous info post. For me personally, if I was worried about "destroying" my car it would still be stock and my wife would still be using it to haul the kids around.

For the record, I've spoken to several people who've bypassed the dropping resistor only during WOT and have had it that way for several years with no adverse effects as of yet. A permanent disconnect would be much more likely to significantly decrease the lifespan of the transmission. As far as I'm concerned, unless I get my transmission rebuilt the extra horsepower will eventually blow it up anyway and that's my problem. I have another ready to take it's place

[qship96]

Many would say letting the wife drive around with the kids is the quickest way to destroy any car!!!!