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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Alpina and Linear Throttle



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      06-11-2016, 05:10 PM   #1
jwebb335xi
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Hey guys,

I don't know if this is the best place to post this note, but I had an observation I thought I'd share with the community. Generally, I hear people say the Alpina B3 transmission flash is either (1) terrible or (2) the greatest thing since sliced bread. Regardless of your previous opinion, I'd suggest (if you have it) trying to pair it with a linear throttle tune.

While swapping tunes this week, I noticed the constant need for the B3 to shift up to conserve gas was particularly frustrating with a "stock" throttle map. The car would surge, shift, surge, shift, etc.... But, I switched to a linear version of that same OTS tune and, although the car still hits 5th gear around 45 mph, I hardly noticed the shifting because the throttle is smooth rather than "peaky." Also, given the throttle is linear, if I apply more gas, the B3 tune holds lower gears longer, giving a somewhat NA feeling overall.

Clearly, in sport mode with your foot on the floor, these observations mean nothing because the car races toward red and shifts very crisply regardless of throttle style.

Bottom line, if you have the B3 and don't think it's the greatest thing since sliced bread, perhaps you can try it with a linear tuned throttle to see if that meets your needs. Or, as is the case with my primary custom tune, try using it with 380 ish AWHP; that works too!!
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      06-11-2016, 05:49 PM   #2
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I did not notice much of a difference with the OTS Cobb maps + Alpina flash with linear vs stock throttle. I've since moved to JB4 with BMS backend (race) flash. The newer JB4 firmware with variable linear throttle mapping has made Alpina D mode much more palatable,even on a more conservative setting.

I've said this in older threads but maybe worth repeating. It feels like the Alpina flash was meant to go with a motor + ECU flash that had much more aggressive throttle mapping.

So basically I'm agreeing with you, but from a different tune standpoint.
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      06-11-2016, 06:31 PM   #3
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Quote:
Originally Posted by ajsalida
I did not notice much of a difference with the OTS Cobb maps + Alpina flash with linear vs stock throttle. I've since moved to JB4 with BMS backend (race) flash. The newer JB4 firmware with variable linear throttle mapping has made Alpina D mode much more palatable,even on a more conservative setting.

I've said this in older threads but maybe worth repeating. It feels like the Alpina flash was meant to go with a motor + ECU flash that had much more aggressive throttle mapping.

So basically I'm agreeing with you, but from a different tune standpoint.
Cool perspective!
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      06-11-2016, 06:51 PM   #4
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Quote:
Originally Posted by jwebb335xi View Post
Cool perspective!
Thanks. There is some logic to it, the Alpina B3 motor has lowered compression ratio, running higher boost. Under that scenario the Alpina TCU map would be even more horrible, as there'd be even less power before boost kicked in with a stock throttle map. So I'm guessing they make sure a small pedal movement got you into boost right away, which is similar to what the JB4 menu 11 now does. It is much easier to get D to kick down, and keeping your foot into it just a bit will prevent it from shifting up into 6th so soon. Of course as soon as you let off the gas it goes to 6th but nowhere near as bad as with stock throttle.

I still prefer sport and M modes but D is not so painful anymore.
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      06-12-2016, 02:35 AM   #5
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To me the best part about the Alpina flash in D mode with a tune is the rev match, gives quite a nice exhaust note + spool sound with dp's under moderate acceleration.
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      06-13-2016, 11:16 PM   #6
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OP I completely disagree. For me Alpina plus linear throttle felt like I was being held back by a rubber band.

I agree with ajsalida though the jb4 has made it way better now.
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      06-13-2016, 11:27 PM   #7
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Playing devils advocate here, low Rpm shifts cause more load on the engine and though you might save a sniff of gas it's not really healthy for the drive train .. I loved it, ran it for a year then reverted to stock due to the same argument
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      06-14-2016, 01:18 PM   #8
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I hate Alpina D like everyone else, but the shifts in M mode are too good to give up.

Hopefully Nizpro will release their TCU tuning abilities soon and we'll no longer need to settle on Alpina or stock trans flashes.
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