Tap'n gas a little before you downshift..

Quicktwinturbo · 08-24-2009, 02:38 AM

I do this time to time (usually when I downshift to 2nd or 3rd) and I always wonder if this will harm /stress the tranny... I wish our cars came with nicer tranny

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FrankW · 08-24-2009, 05:16 AM

i do it too. doesn't hurt. do it right it blips just before catching lower gear.

advans · 08-24-2009, 07:49 AM

I do it too. it should be fine!

Dingleberry · 08-24-2009, 11:48 AM

Could somebody explain

firstshadow · 08-24-2009, 12:32 PM

Quote:

Originally Posted by Dingleberry

Could somebody explain

Cliffnotes: Guys driving their automatics as if they were manuals.

Never have, never will.

1qikctr · 08-24-2009, 02:08 PM

Ditto here, I think it should be fine.

jturkel · 08-24-2009, 02:15 PM

i do it too.

Quicktwinturbo · 08-25-2009, 01:37 AM

Glad to see some of you does this as welll.. It actually works jst fine if you do it right...
Thanks y'all

JonMBZ · 08-25-2009, 01:42 AM

is that when u hit the kick down switch quickly making the car downshift? My bmw use to do this real well I didnt notice my C55 doing it and I have tried it a few times. I really dont like the shift patterns even in sport mode it seems to shift too early.

Quicktwinturbo · 08-25-2009, 04:18 AM

Quote:

Originally Posted by JonMBZ

is that when u hit the kick down switch quickly making the car downshift? My bmw use to do this real well I didnt notice my C55 doing it and I have tried it a few times. I really dont like the shift patterns even in sport mode it seems to shift too early.

Noooo... You should try ECU - Reset... Do search on how to.

We were talking about just tap'n a gas a litle to match RPM when you downshift (blip)

JonMBZ · 08-25-2009, 11:03 AM

oh I see what would be the purpose of this? To make the tires spin or racing situations? I would be afraid to do this myself. I always thought just downshifting would be hard on the trans if the RPMs were too high. I never really knew what a blip was I thought it was a C63 feature so I didn't really care much. I thought about resetting the ECU, but the way traffic is here I figured I might just make it worse than it is now by learning it to my traffic lifestyle. I was thinking a TCU/ECU tune would eliminate it. I read a post I forgot where it stated that a TCU tune would be aggressive all the time in sport and normal in comfort. Thanks for the info

PC Valkyrie · 08-25-2009, 01:17 PM

Quote:

Originally Posted by JonMBZ

oh I see what would be the purpose of this? To make the tires spin or racing situations? I would be afraid to do this myself. I always thought just downshifting would be hard on the trans if the RPMs were too high. I never really knew what a blip was I thought it was a C63 feature so I didn't really care much. I thought about resetting the ECU, but the way traffic is here I figured I might just make it worse than it is now by learning it to my traffic lifestyle. I was thinking a TCU/ECU tune would eliminate it. I read a post I forgot where it stated that a TCU tune would be aggressive all the time in sport and normal in comfort. Thanks for the info

The purpose of the throttle "blip" is the match engine speed with the speed of the drive shaft.

When you downshift (automatic or manual transmission), you will feel an unpleasant "jerk" when the lower gear is engaged because you suddenly force the engine speed to higher values. By blipping the throttle before the lower gear is engaged, you eliminate or minimize that unpleasant "jerk" which could be enough to unbalance the car and cause a spin when cornering on a track.

That's why people who drive manual transmission cars perform "heel'n toe", where they brake and throttle blip at the same time before they downshift and release the clutch to engage the lower gear. The newer dual clutch transmissions and AMG Speedshift Plus (C63) and AMG MCT (new SL63/E63) transmissions do this blip automatically before any downshifts.

JonMBZ · 08-25-2009, 02:45 PM

Ok that makes a lot of sense now I guess I will try this out. Thanks for taking the time to explain it to me. I am sure others will enjoy this piece of info as well.

Quote:

Originally Posted by PC Valkyrie

The purpose of the throttle "blip" is the match engine speed with the speed of the drive shaft.

When you downshift (automatic or manual transmission), you will feel an unpleasant "jerk" when the lower gear is engaged because you suddenly force the engine speed to higher values. By blipping the throttle before the lower gear is engaged, you eliminate or minimize that unpleasant "jerk" which could be enough to unbalance the car and cause a spin when cornering on a track.

That's why people who drive manual transmission cars perform "heel'n toe", where they brake and throttle blip at the same time before they downshift and release the clutch to engage the lower gear. The newer dual clutch transmissions and AMG Speedshift Plus (C63) and AMG MCT (new SL63/E63) transmissions do this blip automatically before any downshifts.

08-24-2009, 05:16 AM	#2
FrankW MBworld Guru Garage is empty, add now Join Date: Apr 2002 Location: Diamond Bar, CA Posts: 21,989 Drives: white and whiter	i do it too. doesn't hurt. do it right it blips just before catching lower gear. __________________ 2002 W203 M112K with insane amount of mods "updates on last page!" 2008 W204 M272 with not so much mods. wants 307hp 7200 redline engine from SL350 (new pic on last page) For Sale:

08-24-2009, 07:49 AM	#3
advans MBWorld Fanatic! Garage is empty, add now Join Date: Jul 2005 Location: New York City Posts: 7,398 Drives: C55 ///AMG, 535xi	I do it too. it should be fine! __________________ from c320 coupe to C55 ///AMG ________on e9xpost.com________ from 535xi to ///M3 ZCP ___________________on mbworld.org

08-24-2009, 02:08 PM	#6
1qikctr MBWorld Fanatic! Garage is empty, add now Join Date: Apr 2004 Location: sf Posts: 1,582 Drives: Merc power	Ditto here, I think it should be fine. __________________ A Machine Gun

08-24-2009, 02:15 PM	#7
jturkel MBWorld Fanatic! Garage is empty, add now Join Date: Oct 2006 Location: Houston, TX Posts: 4,786 Drives: 02 C32 AMG	i do it too. __________________ \| 02 C32 AMG \| SL55 Intake w/K&Ns \| LET 185 Pulley \| Custom dynotune \| LET Heat Exchanger \| Eurocharged Headers \| Res Delete \| NGK IX Iridiums \| Magnecor KV85s \| NW Pulley Saver \| NW ISO Kit \| Valentine1 \| DashDyno SPD \| CF Trunk Lip \| Need to Install: NW oil catch can, C3P I/C Reservoir

08-25-2009, 01:37 AM	#8
Quicktwinturbo MBWorld Fanatic! Garage is empty, add now Join Date: Jun 2006 Location: IL, GA, CA Posts: 1,897 Drives: CLS, SLK, ETC	Glad to see some of you does this as welll.. It actually works jst fine if you do it right... Thanks y'all __________________

08-24-2009, 11:48 AM	#4
Dingleberry Super Member Garage is empty, add now Join Date: Aug 2009 Location: USA Posts: 982 Drives: Marsaydees	Could somebody explain

08-25-2009, 01:42 AM	#9
JonMBZ MBWorld Fanatic! Garage is empty, add now Join Date: Jun 2006 Location: California Posts: 2,040 Drives: 06 C55, 09 E350	is that when u hit the kick down switch quickly making the car downshift? My bmw use to do this real well I didnt notice my C55 doing it and I have tried it a few times. I really dont like the shift patterns even in sport mode it seems to shift too early. __________________ Resonator + Rear Cats Deleted

08-25-2009, 11:03 AM	#11
JonMBZ MBWorld Fanatic! Garage is empty, add now Join Date: Jun 2006 Location: California Posts: 2,040 Drives: 06 C55, 09 E350	oh I see what would be the purpose of this? To make the tires spin or racing situations? I would be afraid to do this myself. I always thought just downshifting would be hard on the trans if the RPMs were too high. I never really knew what a blip was I thought it was a C63 feature so I didn't really care much. I thought about resetting the ECU, but the way traffic is here I figured I might just make it worse than it is now by learning it to my traffic lifestyle. I was thinking a TCU/ECU tune would eliminate it. I read a post I forgot where it stated that a TCU tune would be aggressive all the time in sport and normal in comfort. Thanks for the info __________________ Resonator + Rear Cats Deleted

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08-25-2009, 02:45 PM