Why the personal attack on a respected member that made a valid point? It was your original post that created the confusion.



Here are some answers for you:

1. Yes, the transmission shifts at redline under full throttle acceleration. I don't believe any car shifts at rev limiter rpms in auto mode. That would create more potential for engine damage and actually slow your acceleration with the momentary engine cut out. Yes, use manual shift mode at the track. See Dave B's great explanation for drag strip driving. If you are talking about a road course track, yes use manual mode as well to be in the right gear at the right time. (I only have experience with an MT in this regard.)

2. Yes, over revving causes engine damage. At 30-40 mph in 4th gear you will not be over revving since the engine/gearing is capable of driving in 1st gear at those speeds. At 40mph in my 6MT I drive in 5th and even 6th gear when I am just cruising. I don't know what you mean by overshifting to save gas. If you are talking about manually shifting to the highest gear possible at low speeds this will help fuel economy but probably not more than in auto mode. If you drive your car in auto mode it will always select the highest possible gear to minimize engine rpms and maximize fuel economy unless it is under load to accelerate or climb a hill etc.

 

-EDITED-

Screw it, dont feel like getting banned, I'll jsut send an angry PM or something. =_=

 

^????

 

Seems like this thread is ready for closure or deletion at this point.

OP - you might just want to PM people...less trouble for us all , I think.

Rick

unsubscribing

 

FWIW... I believe the OP had 2 simple questions... does the AT shift at redline in full auto mode = answer no, it will shift much sooner than redline in every gear. His second question (even though initially miss represented) is will shifting to a higher gear early in the rmp range help mpg = answer, generally yes - basically it's rmp that burn gas, the lower the rmp the better you mileage... As previously stated driving in full auto will almost certainly be your best bet for best mpg.

As far as drag racing... always stay in MM. I have no idea how the G lost to the Camero in MM but won in full auto (stated in previous post) I guarantee you will run slower in full auto... the highest HP is in the higher rmp and the only way to max out the rmp is in MM.

Brake Torque has been a perplexing issue most of the time... for me it simply kills power to the extent that is not worth it. I've heard many others encounter the same thing (Gs and Zs)... however some seem to generate good launches with this technique. You'll have to try it yourself to see what your car does. There are tricks though, that address the ECU cutting power when applying brake and throttle at the same time - and one (possibly another) aftermarket vendor is working on a mod for this.

 

i think i saw a thread about the 1/4 with using the tip vs auto...i think auto was quicker right right..but when on the track i would think using tip would be more fun and quicker...but yup

 

OK - so for me - personally and my car - this is not at all the case.

So to put that comment in context - I have an FI'd car - LOTS of goodies! My car get much better gas mileage when the RPM's are higher, as it is tuned and designed to be more efficient when the RPM's are higher.

I get about 8-10 MPG around the city and general street driving. I hold the car and 2nd and 3rd all the time to keep the RPM's above about 2200 - when I do, I get about 16-18MPG on average. I have tested this MANY times.

Now - on the freeway - same thing - once I got my gears, my mileage went up, again, because the car is tuned to be more efficient in that area of the curve.

Now - with a VB upgrade or a custom trans build - everything can be thrown out. I use 1st to launch and then almost immediately put the car into drive for the rest of the way. On average - the car betters itself by about .2 when I do this. This isn't because I don't know how to drive my AT either! It's because the computer is far better at shifting at the right time than I am, and pretty much everyone else. My car, in Auto mode, will shift right at 7400RPM - in every gear. If I go manual, I can miss it by 100-200 RPM, and therefore not get as good of a time, or worse, hit the rev limiter.

So - for an NA application - not many mods, you know the simple stuff, I completely agree that you should be in manual mode only, when racing, as the car WILL shift at about 6400-6600 RPM's regularly.

If you go FI, and DO NOT modify the trans, it will shift closer to 7K RPMs, as the trans computer can shift as fast as the RPM's are rising, as it doesn't know any better. Some FI's hit the rev limiter and think they need VB upgrades. If you reflash the ECU though, and raise the rev limiter, it wont be an issue, unless you have major build. You may still need/want the VB upgrade, but the ECU reflash is far more worth it in the end, and you should do both. Wild builds - well then have a trans built properly and you'll never worry about it.

So that's my take, experience, and look at this. Some of us will argue about how it works for them versus others. Almost all of our cars are different, so no particular answer may be correct, depending on mods. These cars react in very weird ways to mods. Best 5AT mods you can do to help shifting are ground wires and an engine torque brace, then VB upgrade or all the way to a custom trans build.

 

That sh*t is FUNNY!!!

 

this thread my be a little old but since you guys are talking about trannies I figured i could ask a quick question.

Is it harmful to down shift the 5at....suppose i had the car in manual mode and was driving with moderate acceleration, then i wanted to stop is it bad move the selector down while i am applying brakes? Also when its starts to rev match is it more harmful when it rev matches a higher rpm than a lower one?

 

It wont harm anything - really - realistically it does put more stress on the tranny and drive train, and does force the engine into higher RPM's when it doesn't need to be there....so that's the technical answer.

For me - hell I drive the car as if it was a stick and engine torque brake all the time by downshifting it.

Rick

 

cool...thanks^^^