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-   -   E46 rev drop for good (http://forum.e46fanatics.com/showthread.php?t=936240)

alinLink 07-31-2012 03:55 PM

E46 rev drop for good
 
Hi guys!

Before you say VANOS, please read below :)

The car:
- 2001 320i (170hp) saloon with manual transmission.

The problem:
- rev the engine (while in neutral) up to a point, keep it there, after 2sec the rev drops about 200rmp and it stays there (does not stutter).

This causes problems in 1st gear and mostly in reverse.
Because the engine is slightly revved when the rev drop happens, this occasionally leads to engine stall.

Got any ideas on what could cause this annoying issue?

manywelps 08-01-2012 02:44 PM

Fuel pressure... so fuel delivery?

Pump or filter maybe?

When it's cold idle I assume nothing happens.

Paulmac 08-12-2012 07:34 PM

Eagerly awaiting a reply on this one too...
I've got a 2001 325ci manual, and it does the same thing.

Ask the car for 1500rpm in neutral (or more critically while you're trying to reverse out of a carpark...), and you get it for 1 second before it drops to 1300 on you, often resulting in a stall.

Otherwise it appears to drive just fine...

325CiMaN 08-17-2012 12:17 PM

Quote:

Originally Posted by Paulmac (Post 14647318)
Eagerly awaiting a reply on this one too...
I've got a 2001 325ci manual, and it does the same thing.

Ask the car for 1500rpm in neutral (or more critically while you're trying to reverse out of a carpark...), and you get it for 1 second before it drops to 1300 on you, often resulting in a stall.

Otherwise it appears to drive just fine...

Mine did the same thing... It's normal for drive by wire.. Fix is sprint booster, it keeps the voltage up and doesn't allow it to drop.

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Beamer Creamer 10-01-2012 01:50 AM

Sprint booster is a joke that jump adds to the sport mode.

325CiMaN 10-01-2012 04:05 AM

I love sprint booster. I lowered my 60ft times and my reaction time on the 1/4 mile. It also adds pep to the car and less pedal effort for the same effect. I rev faster then a normal e46 cause the dme its seeing full throttle before your foot hits the ground.

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Beamer Creamer 10-01-2012 04:10 AM

True that. It is faster shifting then to floor again but on the line i see no gain cause need to milk into throttle to get grip anyway. I ran a 13.56 quarter with stock manual. Just wondering what others are running?

325CiMaN 10-01-2012 04:30 AM

I haven't ran yet with this new motor but this Wednesday i hope i will be able to :D

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Beamer Creamer 10-01-2012 04:50 AM

Sorry. Thot u had m3 for some reason. I guess youll be doin real good if u beat that.lol

325CiMaN 10-01-2012 05:03 AM

Just dynoed it today 360rwhp at the wheels 285ftlb :eek:

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325CiMaN 10-01-2012 05:07 AM

I smoked my moms bone stock 04 m3 smg today.....she didn't like that to much...now she's trying to get my dad to buy her a supercharger. Mines all motor n/a power baby love it! Built the motor my self dad came to my place a few times to help but mainly my buds and i built it out of my garage had a machine shop do all of the calculating and machine work but i assembled it.

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Beamer Creamer 10-01-2012 06:29 AM

Sweet. What displacement and motor? I had a 323ci before the m3 . U do have a stick though rite?

325CiMaN 10-01-2012 07:32 AM

Ya its manual its a 3.0l 11:1 compression pistons, ported polished head schrick 272 cams.

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Beamer Creamer 10-01-2012 07:45 AM

How much for port and polish? Thats pretty impressive hp for that. Now u just need the m3 suspension and body and brakes......... Just jokes. Nice job

325CiMaN 10-01-2012 08:32 AM

Already done lol just put the front bumper on lol and suspension its completely done to much to list tho lol

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alinLink 10-01-2012 09:20 AM

Hey fellas, remember to focus on the topic: "E46 rev drop for good" !

325CiMaN 10-01-2012 09:30 AM

Sorry! Got carried away! Have you resolved the issue yet?

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