What is the culprit? Auto/Steptronic or Throttle Response?

E90076 · 03-04-2008, 02:02 PM

I've notice when cruising at about 40 mph (5th or 6th gear - 1,500 rpms) that if I give it just a little throttle, the tach blips up about 200 to 300 rpms, falls immediately back down to 1,500 and then starts to accelerate. It happens pretty fast but it just seems odd to me. I'm used to the manual Z I traded in - is this normal for a stock 335i auto and if so, what's the cause?

E90076 · 03-04-2008, 06:31 PM

Edit: It may only pop up about 100-200 rpms before falling, then the power comes in an she accelerates...

bimdaddy · 03-04-2008, 06:48 PM

Hmm....I hadn't noticed. Most of the time I'm in DS hanging on to the wheel with both hands and eyes on the road. No time to look at the tach cuz SSTT pins you hard to the seat!

baggerben · 03-04-2008, 07:14 PM

maybe the torque converter locking up/unlocking?

cn555ic · 03-04-2008, 07:18 PM

Hmmmm I had that same problem, but after installing the Forge DV's the throtte response for on and off throttle seems to be seamless!!

E90076 · 03-04-2008, 10:15 PM

Thanks to all. Just went on a drive and to clarify - this happens mainly when I am completely off the throttle and then quickly give it a tap and hold for a little gas. Rpms blip, fall slightly and hold with a little acceleration. This is most noticeable while cruising in 6th/M6. If its not too much trouble, and you can do it SAFELY, would any of you auto guys mind checking this out sometime? My main concern is that my torque converter was replaced in December and I want to make sure I'm not being paranoid before I return it to the dealer. I sure would appreciate it.

e90AW335i · 03-04-2008, 10:17 PM

Quote:

Originally Posted by E90076

Thanks to all. Just went on a drive and to clarify - this happens mainly when I am completely off the throttle and then quickly give it a tap and hold for a little gas. Rpms blip, fall slightly and hold with a little acceleration. This is most noticeable while cruising in 6th/M6. If its not too much trouble, and you can do it SAFELY, would any of you auto guys mind checking this out sometime? My main concern is that my torque converter was replaced in December and I want to make sure I'm not being paranoid before I return it to the dealer. I sure would appreciate it.

I will test this out in the morning for you and get back to you. What mph were you at roughly?

BMWPower06 · 03-04-2008, 11:10 PM

same thing happens to me when im in M5 (my top gear, i know i dont have a 6th gear

)

pretty sure its normal

E90076 · 03-04-2008, 11:43 PM

Quote:

Originally Posted by e90AW335i

I will test this out in the morning for you and get back to you. What mph were you at roughly?

Thanks man. Roughly around 35 - 40 mph. Should be around of 1500 - 1700 rpms in 6th or at least it is for me.

E90076 · 03-06-2008, 12:54 PM

Quote:

Originally Posted by e90AW335i

I will test this out in the morning for you and get back to you. What mph were you at roughly?

Any luck with testing this?

turbotko · 03-06-2008, 02:20 PM

Yeah, it's the convertor locking up. Completely normal. When you let off the gas the convertor unlocks, then when you roll back into the gas the convertor locks back up dropping the rpm.

The way BMW locks up the convertors on the E90's almost immediately once the car starts moving from a dead stop is the main reason these new steps are so nice. It makes them actually feel like a manual trans.

marcvtec · 03-06-2008, 06:22 PM

why in high gear at that speed

cn555ic · 03-06-2008, 06:36 PM

I don't know about that but ever since i installed my forge DV's that response from the sudden gas after letting go of the throttle has almost totally disappeared...

e90AW335i · 03-06-2008, 08:24 PM

Quote:

Originally Posted by E90076

Any luck with testing this?

Nothing conclusive really. I am going to take a different route to work tomorrow with less traffic (longer though), and test it out. I will report back here around 10am when I am out at the clients....

E90076 · 03-07-2008, 08:42 AM

Quote:

Originally Posted by e90AW335i

Nothing conclusive really. I am going to take a different route to work tomorrow with less traffic (longer though), and test it out. I will report back here around 10am when I am out at the clients....

Thanks, I appreciate it.

E90076 · 03-07-2008, 08:45 AM

Quote:

Originally Posted by turbotko

Yeah, it's the convertor locking up. Completely normal. When you let off the gas the convertor unlocks, then when you roll back into the gas the convertor locks back up dropping the rpm.

The way BMW locks up the convertors on the E90's almost immediately once the car starts moving from a dead stop is the main reason these new steps are so nice. It makes them actually feel like a manual trans.

Thanks, I have heard that the TQ convertor locks up around 1500rpms from a dead stop. But just to make sure I understand your statement - you're then saying that while the car is cruising and the driver lets off the gas, the convertor will unlock. Then when getting back on the gas, it locks up again while cruising?

e90AW335i · 03-07-2008, 07:04 PM

Quote:

Originally Posted by E90076

Thanks, I appreciate it.

Mine reacted the same way. I think you are fine. I only got to test once or twice because of traffic but I will test again on my way into work in the morning. There is a lot less traffic tomorrow.....

I would worry much though man, I think you are fine....

E90076 · 03-07-2008, 07:05 PM

Quote:

Originally Posted by e90AW335i

Mine reacted the same way. I think you are fine. I only got to test once or twice because of traffic but I will test again on my way into work in the morning. There is a lot less traffic tomorrow.....

I would worry much though man, I think you are fine....

Thanks man, please let me know how your test tomorrow goes as well.

e90AW335i · 03-07-2008, 07:07 PM

Quote:

Originally Posted by E90076

Thanks man, please let me know how your test tomorrow goes as well.

For sure bro, relax and have a good friday.....

E90076 · 03-16-2008, 09:42 AM

Quote:

Originally Posted by e90AW335i

For sure bro, relax and have a good friday.....

Hate to be bothersome but I was just wodering if you ever had a chance to check this out on your drive with less traffic? Thanks again.

About to schedule an appt for the Dinan flash and I want to make sure this is in order before doing any mods...

E90076 · 03-22-2008, 04:02 PM

So now I'm a little worried. Just drove the 135i and didn't get the same results. Any thoughts as to what's wrong with my ride?

03-04-2008, 02:02 PM	#1
E90076 Lieutenant 235 Rep 506 Posts Drives: X3M, M2CS, M5CS Join Date: Nov 2007 Location: USA iTrader: (0)	What is the culprit? Auto/Steptronic or Throttle Response? I've notice when cruising at about 40 mph (5th or 6th gear - 1,500 rpms) that if I give it just a little throttle, the tach blips up about 200 to 300 rpms, falls immediately back down to 1,500 and then starts to accelerate. It happens pretty fast but it just seems odd to me. I'm used to the manual Z I traded in - is this normal for a stock 335i auto and if so, what's the cause?
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03-04-2008, 06:31 PM	#2
E90076 Lieutenant 235 Rep 506 Posts Drives: X3M, M2CS, M5CS Join Date: Nov 2007 Location: USA iTrader: (0)	Edit: It may only pop up about 100-200 rpms before falling, then the power comes in an she accelerates...
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03-04-2008, 06:48 PM	#3
bimdaddy Major 37 Rep 1,165 Posts Drives: 911 Carrera & G01 X3 Join Date: Feb 2007 Location: MD iTrader: (10)	Hmm....I hadn't noticed. Most of the time I'm in DS hanging on to the wheel with both hands and eyes on the road. No time to look at the tach cuz SSTT pins you hard to the seat! __________________ 2020 X3 X-Drive 30i; Alpine White/Mocha
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03-04-2008, 07:14 PM	#4
baggerben Private First Class 2 Rep 141 Posts Drives: volvo s70 t5,for now.335i soon Join Date: Jul 2007 Location: north eastern usa iTrader: (0)	maybe the torque converter locking up/unlocking?
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03-04-2008, 07:18 PM	#5
cn555ic 441 Rep 18,331 Posts Drives: 335i Join Date: Jun 2007 Location: US iTrader: (6)	Hmmmm I had that same problem, but after installing the Forge DV's the throtte response for on and off throttle seems to be seamless!!
	Appreciate 0 Quote

03-04-2008, 10:15 PM	#6
E90076 Lieutenant 235 Rep 506 Posts Drives: X3M, M2CS, M5CS Join Date: Nov 2007 Location: USA iTrader: (0)	Thanks to all. Just went on a drive and to clarify - this happens mainly when I am completely off the throttle and then quickly give it a tap and hold for a little gas. Rpms blip, fall slightly and hold with a little acceleration. This is most noticeable while cruising in 6th/M6. If its not too much trouble, and you can do it SAFELY, would any of you auto guys mind checking this out sometime? My main concern is that my torque converter was replaced in December and I want to make sure I'm not being paranoid before I return it to the dealer. I sure would appreciate it.
	Appreciate 0 Quote

03-04-2008, 11:10 PM	#8
BMWPower06 A^M=G is nothing w/o the Power of ///M 171 Rep 1,816 Posts Drives: ///M5 & ///M3 Join Date: Jan 2007 Location: Washington D.C. iTrader: (0)	same thing happens to me when im in M5 (my top gear, i know i dont have a 6th gear ) pretty sure its normal __________________ Indianapolis Red BMW ///M5
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03-06-2008, 02:20 PM	#11
turbotko Lieutenant 67 Rep 527 Posts Drives: 09 E90 M3 Join Date: May 2007 Location: georgia iTrader: (3)	Yeah, it's the convertor locking up. Completely normal. When you let off the gas the convertor unlocks, then when you roll back into the gas the convertor locks back up dropping the rpm. The way BMW locks up the convertors on the E90's almost immediately once the car starts moving from a dead stop is the main reason these new steps are so nice. It makes them actually feel like a manual trans. __________________ 10 AW on fox E90 M3 with 2 pedals, gentleman’s ride 08 AW on fox E92 M3 also 2 pedals, a bit more rowdy
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03-06-2008, 06:22 PM	#12
marcvtec Banned 407 Rep 2,704 Posts Drives: M5 Join Date: Oct 2006 Location: toronto iTrader: (0)	why in high gear at that speed
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03-06-2008, 06:36 PM	#13
cn555ic 441 Rep 18,331 Posts Drives: 335i Join Date: Jun 2007 Location: US iTrader: (6)	I don't know about that but ever since i installed my forge DV's that response from the sudden gas after letting go of the throttle has almost totally disappeared...
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03-22-2008, 04:02 PM	#21
E90076 Lieutenant 235 Rep 506 Posts Drives: X3M, M2CS, M5CS Join Date: Nov 2007 Location: USA iTrader: (0)	So now I'm a little worried. Just drove the 135i and didn't get the same results. Any thoughts as to what's wrong with my ride?
	Appreciate 0 Quote