Datatek
Well-Known Member
The auto box is controlled electronically and the firmware can be adapted for many different situations just as it will be different for the petrol engine compared to the diesel.
+1 it's all described in RAVE, but that doesn't detail the ECU strategy. Only how valve-4 works & the stages.
Datatek
Well-Known Member
Be Surprised if it makes it the whole way
FEI
Well-Known Member
If your diffs new diffs fit physically.
Your torque converter will spend more time out off lockup. That will result in more heat in your atf fluid so a slight decrease in atf fluid lifetime.
Then higher cylinder pressures. It will take x amount of energy to move the car down the road at a certain speed. In order for your engine to produce x amount of energy but at lower rpm it will have to output more torque. Torque is directly related to cylinder pressure. So if your rpm drops by 20% your torque will go up by 20% for the same amount of energy output. If your torque is up by 20% that means cylinder pressure is up by 20%.
Thats not taking into account that engine efficiency changes with rpm so at low rpm you usually have bad efficiency then where the engine makes peak torque you have peak efficiency and then efficiency gets worse again as rpm increase.
So if you drop your engine rpm too far below your peak torque rpm your cylinder pressure will have to be even higher than 20%.
Your torque converter will spend more time out off lockup. That will result in more heat in your atf fluid so a slight decrease in atf fluid lifetime.
Then higher cylinder pressures. It will take x amount of energy to move the car down the road at a certain speed. In order for your engine to produce x amount of energy but at lower rpm it will have to output more torque. Torque is directly related to cylinder pressure. So if your rpm drops by 20% your torque will go up by 20% for the same amount of energy output. If your torque is up by 20% that means cylinder pressure is up by 20%.
Thats not taking into account that engine efficiency changes with rpm so at low rpm you usually have bad efficiency then where the engine makes peak torque you have peak efficiency and then efficiency gets worse again as rpm increase.
So if you drop your engine rpm too far below your peak torque rpm your cylinder pressure will have to be even higher than 20%.
Grrrrrr
Technician, Bodgit & Scarper Ltd
I mentioned oil pressure and water pump for cooling. I don't know if it will be an issue but it is something I would keep an eye on in case it becomes an issue. I'm not a motor engineer, I am a tinkerer and I am well aware that these things are fiendishly complex with lots of trade-offs. I'm sure there will be other trade offs. Will they be ok, livable with or catastrophic? Don't know. You've checked what you can and it looks OK so time to try it but with an eye scanning for Captain Cockup trying to muscle in.
Like I say, I will be interested to see how it turns out. Best of luck.
Grrrrrr
Technician, Bodgit & Scarper Ltd
Phil is the guru on these boxes. Whatever he says.
Speaking from very recent experience, if an suto box runs for any petiod of time with less than the normal amount of fluid in it, it will soon be curtains for the box. And mine had less of a hard time than the OP's one did.
I'm not driving it there to scrap it on this trip, instead I need it to make it all the way there and back without any problems. I have stated repeatedly that this will be a return trip.So if your gona drive it there and scrap it why bother with any of this bollocks
J
It may be another few years before I leave England and at that future time I will scrap it. Unless somebody wants to come and get it.
Are you asking me these questions just to attack me or do you have an actual reason for wanting to know this information? I came here to ask a question about my car and it seems like I have to answer personal questions about my life every few comments.
And for the 3rd time I will find this out with my OBD reader so I'm not worried.
I was not offended by it. But have a look at the second comment. Then the third comment, the fourth comment, the fifth comment, the six comment etc.
But if you want to call it banter then everything that I have said back to you guys is just banter.
When I call you guys idiots for saying really dumb things or for trying to play a game of gotcha questions it's just banter.
Why are you getting offended by my banter?
My gearbox did not have a hard time, it had about three days of missing gear changes on a 10 minute drive, and then I stopped driving it, found the leak, fixed it and filled it up again.
Thanks. People drive at 1,300 RPM at lower speeds for long periods and have no concern for the water or oil pressure. If it was running at 500 RPM I would consider that fact, but it will be running in a typical rev range.
Datatek
Well-Known Member
Should be fun when your (generic?) OBD reader tells you on the autoroute that the torque convertor is not locking up and you are not in top gear. I doubt that you can manually force the selection of top gear, the electronics decide when to shift not you.. My old diesel runs happily at over 2k rpm on the autoroute. As said repeatedly, lower revs/taller gearing requires more torque which equals more strain on the engine not less.
