I don't know if this belongs in the right category. But I had a conversation with my friend about perfect up shifting. I try to drive the car with out jerking too much but then he said that a manual car is supposed to jerk and that I am supposed to let it jerk because it's normal. From what I heard the jerking means the wearing of the syncros on the gear. And perfect up shift will lessen the tear or worn on the syncros. Any opinions? Feel Free.

 

Well, a perfect upshift would be pre-revving the motor to EXACTLY the right revs before letting out the clutch. So You would clutch, shift, wait, and let it out as it fell or try to match it with the gas. Our cars jerk more because of DBW and its hanging revs. It is do-able, and may save some minor wear and tear, but probably not enough that you would notice for all that extra effort.

 

It should be a smooth transition almost like a new automatic if you are doing it right.

 

does anybodys car jerk really hard when the engine is not warm, in 1st and 2nd mostly... even if you have your foot off the gas and the clutch and are just coasting in 1st or 2nd???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Honder07si &raquo;</TD></TR><TR><TD CLASS="quote">does anybodys car jerk really hard when the engine is not warm, in 1st and 2nd mostly... even if you have your foot off the gas and the clutch and are just coasting in 1st or 2nd???</TD></TR></TABLE>

Yes,only when the car is cold / just remeber to warm it up and all is good

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Honder07si &raquo;</TD></TR><TR><TD CLASS="quote">does anybodys car jerk really hard when the engine is not warm, in 1st and 2nd mostly... even if you have your foot off the gas and the clutch and are just coasting in 1st or 2nd???</TD></TR></TABLE>

Yep, I get a jerk when it's cold between 1st to 2nd, and 2nd to 3rd. I also get a jerk when I change driving styles from conserative to aggressive, even when it's warmed up. As I understand it (and as I have observed on my A/F gauge), the ECU adjusts fuel mix based on your driving style.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Demonis &raquo;</TD></TR><TR><TD CLASS="quote">Well, a perfect upshift would be pre-revving the motor to EXACTLY the right revs before letting out the clutch.</TD></TR></TABLE>

Hey guy its not a 10 speed freigthliner. The transmissions have synchronizes, let them do their job. You don't rev match gear when up shifting, you rev macth when down shifting. This is done in vehicles with unsynchronized transmissions, such as commercial motor vehicles and old school ausitin healy's.

As far as down shifting goes, attempting to force the transmission into a gear it isn't ready for requires extra work and can cause premature wear. revving the engine some can help out the synchos a bit and make it easier to place it in the lower gear. If it wont go into gear easily don't force it hold it firmly until it does. Try this out and you may see what I am talking about.

As far as up shifting goes, learn to manipulate the clutch pedal properly and the jerking you are describing will soon disappear.

 

i have been driving sticks since i was 16,but for the
last three years was driving an automatic. i recently
purchased an Si sedan,i am on my second week now
but still having issues with shifting. maybe because,i
am not used to it anymore. what i noticed was when i
drive slow and release the clutch slowly,no jerking
happens,but when i rev hi and shift,1 out of three, the
jerk pops up. i say just get used to shifting properly
meaning releasing the clutch slowly,maybe it's just me,
but it seems that the Si shifts differently than other sticks
that i drove.

 

Sometimes the jerk is what makes it fun!

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Demonis &raquo;</TD></TR><TR><TD CLASS="quote">Well, a perfect upshift would be pre-revving the motor to EXACTLY the right revs before letting out the clutch. So You would clutch, shift, wait, and let it out as it fell or try to match it with the gas. Our cars jerk more because of DBW and its hanging revs. It is do-able, and may save some minor wear and tear, but probably not enough that you would notice for all that extra effort. </TD></TR></TABLE><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EK k kay &raquo;</TD></TR><TR><TD CLASS="quote">It should be a smooth transition almost like a new automatic if you are doing it right.</TD></TR></TABLE>

I agree When done right, you could hardly feel it.

 

i always let my car warm up until revs drop to 1500 rpm's. then head out of my driveway...

 

Yeah...

But if you're jerking so you're moving forward (so the car is slowing down) that's the wrong kind of jerk!

 

sounds like drivers ed 101 in here.

makes my 14 yr old brother look like a professional race car driver.

 

Even with dbw, i still manage silky smooth shifts, and it is all about matching the correct rpms whilst moving into the next gear.

 

alot of people dont agree with pre revving is there an actual reference to this by manufacturers and car experts?

 

When it blinks, WOT shift!! Works for me every time!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by will_rex &raquo;</TD></TR><TR><TD CLASS="quote">When it blinks, WOT shift!! Works for me every time!! </TD></TR></TABLE>

yeah i guess that works too!!!