Downshifting?? Pros and cons? good or bad
01-21-2009, 06:39 PM
#101
5th Gear Member
Join Date: Jul 2007
Location: TX
Posts: 4,897
You don't want to slide it out of gear on the down rpm. Your synchros are less likely to disengage when you're slowing the car while in gear and you don't want to disengage with power applied (bad). I only slide it out of gear while in a steady powerband and use my brakes to slow the car. Takes practice I guess.
I'm not entirely sure why but I have noticed that the mustang is harder to do this with than my old 90 honda. With the mustang sometimes it doesn't seem to want to gently fall out of gear for me when I'm slowing it down and it ends up starting to bog the engine at which point I have to put the clutch in and get it out that way.
01-21-2009, 07:28 PM
#102
4th Gear Member
Join Date: Mar 2008
Location: Alberta Canada
Posts: 1,432
it seems that between 800-900 rpm is the best place to pull out of gear with out the clutch everywere else gets resistance. if there is resistance... dont do it. as said before if it sounds/ feels bad, it is.
01-29-2009, 01:15 PM
#105
1st Gear Member
Join Date: Sep 2008
Location: New Hampshire
Posts: 74
01-29-2009, 03:50 PM
#106
6th Gear Member
Join Date: Feb 2007
Location: state of confusion
Posts: 7,635
But in practical terms of the amount of extra fuel used it doesn't amount to much. One estimate of the extra fuel used might be about 4 cc per double-clutch downshift, counting the brief acceleration enrichments plus the extra fuel used by the higher revs. That's 0.00106 gallon, so every 944th time you do this, you've finally managed to use up an extra gallon.
Norm
01-29-2009, 04:17 PM
#107
4th Gear Member
Join Date: Jul 2007
Location: TN
Posts: 1,895
when i try to rev match and with the clutch in and the shifter in neutral, you almost have to floor the gas pedal to get the rpms to come up past 2k. but then when i leave it in gear and give it gas the rpms shoot right up like normal. it has been like this with both my gt s197's so i thought this was normal. but now hearing ya'll talk about this i am beginning to think something is up?
i know the drive by wire plays a part in this but is something wrong?
i know the drive by wire plays a part in this but is something wrong?
01-30-2009, 02:53 AM
#109
4th Gear Member
Join Date: Dec 2007
Location: Pacific Palisades, CA
Posts: 1,834
if i don't get the rev's up to the right range, i'll just double blip the throttle. but i just use the brakes, no real sense in downshifting at every opportunity. sure, in emergency situations on the highway at 70 and some guy cuts you off you can get out of that sticky situation with a snap in the gears.
01-30-2009, 08:35 AM
#110
4th Gear Member
Join Date: Jul 2007
Location: TN
Posts: 1,895
shipping it out this weekend to get it re-tuned for my pcm code. decided to go back with dynospeed canned tune. loved it in my 07 and after feeling brenspeed and bama tunes i know joes compare very well. my uncle is going to take it to his shop and get him to re-write the tunes i have now to include the stingers. hopefully will have it back in a couple of weeks. let the fun begin again 
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