seabass07

Get smaller tires.

Lol, no.

Or you can log total timing and see it spike to the negative teens or low twenties during a shift.

It definitely happens during shifts, but I've never seen it during a launch or even heard about it.

I think he's referring to the shift timing retard. Actually I re read it and have no idea wtf he's talking about.

What could go wrong?

That sounds like what he's talking about. I tried messing with that for a while, but lost interest. Someone with more IDA experience could probably figure that out in a day.

That doesn't mess it up?

 

Usually not the first few times...

The 05-06's do that in sport mode. I think they kept that logic in the 07+.

Only because the turbo motor makes more torque at the lower rpm!

It's probably the same torque converter

 

I doubt that's the case with the h6 though.

Ahhhh. That explains everything. You have an h6 which has a different torque converter. Completely different since its not a high stall.

Nope. 3rd. That's the odd tcc behavior. Id have to give it a significant amount of gas to get up the hill and that would disengage the tcc. It wouldn't lock up at all while going up mountain passes unless I started going up above 50mph. If I started out slower, it would hang up at the stall speed and sit there heating up the fluid.

No. I had it hot enough that I had a fuel cut though. Coolant temp was still in the middle, but all power cut. No cel or codes, just a total fuel cut. As I pulled over, the coolant temp slowly caught up. After a few minutes, everything was fine.

from my experience the tcc is hydraulically not available in first and 2nd. as its a limp home mode in case of electric or mechanical issue with the tcc solonoid.

i'm sure that can be bypassed but it would need to be figured out.

 

but 3rd should have enough torque to pull most things with the tcc engaged.

I don't think it's really necessary to get the tcc working in 1st and 2nd. The heat will be produced in 3rd during long climbs. There's definitely plenty of torque in 3rd to take care of that.

Following up for FYI and anyone that may have been wondering..

 

I ended up not installing a cooler or doing a flush/fluid change of any kind.. The only thing i did was add a hitch and pulled the trailer. I had 800lbs of people, pets, and stuff in the car and the trailer weighed ~3500lbs (a lot more than expected), i pulled it 3300 miles in 4th gear, rarely did the car hunt for 3rd. It never overheated and did spectacular at 70mph. On the whole trip I averaged 16mpg (mileage/fuel calculation). I anticipated hills, stopping, slowing, and even ran the car hard a few times to merge in to traffic.

 

There is absolutely no reason I believe a trans cooler would have been needed and aside from the cost of fuel and boredom of the trip, I wouldn't hesitate to tow the same trailer across the country again.

 

And when I dig the cooler, thermostat, and extra hose out from the middle of my garage full of household goods, i'm going to post it for sale...what a waste of money.

 

Your experience was the polar opposite of mine. I think I would have had many more issues without the cooler. I had several overheating issues all related to strange TCC behavior. If I were to do it again, I'd install a switch to control the TCC. In that case, I agree that a cooler wouldn't be necessary. Unless you went out of your way to avoid mountain passes, I don't believe that you didn't have some severe temps. Did you log anything?

That's odd. I've never had a blinking at temp light after a TCU reset. At least with the 4th gen, I have felt no difference between doing the learning and not. Its difficult to do the learning process. Basically you need a flat long road that you can just barely go through all the gears at less than 10% throttle. Sounds simple untill you actually try it. Or a lift.

its why i question the ability of the external cooler. as i said its roughly 10% of the surface of the radiator.

 

I've questioned that as well. But when I question it, I get responses that using only a stand alone tube and fin trans cooler with an aftermarket radiator is plenty to keep temps in check. So I still wonder and can't fine real data. I'm sure the radiator is more efficient to a certain point, but then asking a ridiculously thin stock radiator to cool the engine and trans is too much under some conditions.

If I were to do it over again, I'd put the cooler before the radiator so fluid doesn't go directly from the TC to the radiator.

This was with the external cooler after the radiator. I imagine it would have been much worse without the external cooler.

Yup. The problem I ran into was starting up a mountain pass too slow. If I started the climb below 50mph, I was screwed and would have to pull over several times along the way. It was usually because of a truck or a traffic light at the bottom.

 

1st or 2nd would eventually overheat due to no TCC functioning. The trans would not let me get past the stall speed in third. So my trans turned into a coolant heater. I'd hit the fuel cut when the coolant temp was about 2/3's up the gauge, so I know it wasn't coolant temp.

Next failsafe after the tcu locks the tcc is a fuel cut. That's quite a shocker while you're trying to climb a mountain pass.

But give a certain amount of throttle and it will disengage and try to re-engage at a higher rpm. What I found was that it would stay disengaged until around 4500 rpm under those conditions. It was the torque converter that caused my temps to climb. In this case, its an h6, so I'm sure it has a different torque converter, but I would still strongly recommend the cooler for the trip.

I agree with that, however my experience towing a very heavy trailer across country says that engine overheating is likely. The trans will contribute to the engine overheating. Unless the entire trip will be on flat ground. Mountains and very hilly areas are why I say its mandatory.

You will absolutely NEED that trans cooler on your trip! You'll likely overheat the transmission otherwise. IMO, this is mandatory. As for after the trip, you do not need it. Or you can just install it along with a thermostat and leave it there. With a thermostat, you shouldn't have to worry about low operating temps.

 

Do the DIY trans flush. Change both diff fluids. Otherwise, you should be fine.

Kerb is unemployed, so that wouldn't make him less lazy.

 

Just take her to school you lazy bastage.