mis-shifting ...

bimmer_02 · #1 (**permalink**) 09-09-2005, 10:44 AM

mis-shifted a few days ago in my e46 320i, 2nd instead of 4th. i took it to the dealership and they did a compression test to find about 3 or 4 cylenders leaking, they said its not on warranty and will cost about $4k

-wat do you think?
-wat can i change in the engine to make it go faster since they aleady going to open it?

hammerfang · #2 (**permalink**) 09-09-2005, 10:52 AM

that sucks man, i've read alot of threads lately where people have money shifted their cars, as for making it go faster, i would see if u could get a larger motor...there is no replacement for displacement, but if thats not what ur interested in doing i'd got with a supercharger

Andrew · #3 (**permalink**) 09-09-2005, 12:05 PM

Thats alot of $$. It may be good to do some more to it since its all opened, but it will cost extra. DOnt put more $$ into it if you dont really want to add anything. DO whatever you want

corwyn · #4 (**permalink**) 09-09-2005, 12:40 PM

Not sure how much the dealer will want to do in terms of performance mods...sometimes they're awfully touchy about that sort of thing.

Here's a site on shifting technique to avoid having this problem again:
http://www.shortshifter.com/techniques2.htm

SizzFlair · #5 (**permalink**) 09-09-2005, 12:44 PM

yea somehow my 528i didn't shift well. Kept slipping (automatic).

4300$ down the drain

hammerfang · #6 (**permalink**) 09-09-2005, 02:16 PM

that was a very useful link, i pretty much always do that stuff but its good to review

Mpower///_tyron · #7 (**permalink**) 09-09-2005, 05:30 PM

Quote:

Originally Posted by corwyn

Not sure how much the dealer will want to do in terms of performance mods...sometimes they're awfully touchy about that sort of thing.

Here's a site on shifting technique to avoid having this problem again:
http://www.shortshifter.com/techniques2.htm

Thank you for that, I'm jus learning how to drive a manual transmission and I find that helped alot thnx again.

BlazingEngine · #8 (**permalink**) 09-10-2005, 04:52 PM

great link, just recently learned stick to the point of being able to freely go around in sf as well as freeway etc... Safe to say i have had some trouble going into fourth from third at times, seems i keep going through neutral, but iv got it down now

.

Crazy 13immer · #9 (**permalink**) 09-10-2005, 08:10 PM

Yeah, I learned how to drive like that too... After I pulled a $$-shift. I used to always hold it like the picture of him shifting from first to second. And when you have it in third and you pull back, your body has a natural tendancy to pull inwards, especially if you aren't concentrating.. like if your messin around.
But, now WOULD be the right time to upgrade. whether you want to swap motors, or just get a new clutch... it's better to do it now than pay double for labor later on

hammerfang · #10 (**permalink**) 09-10-2005, 10:49 PM

bimmer_02 · #11 (**permalink**) 09-11-2005, 02:36 AM

im thinking more of changing internals in the same enignee i.e cams, pulleys, and things like that, im not really thinking of swaping motors, i dont have that kind of money now ...

why's it called a moneyshift by the way?? :S

napa1m · #12 (**permalink**) 09-11-2005, 04:42 AM

Cos when you shift like that... say BYE BYE to all your MONEY.

Anyone seen a run-through for a RHD? I cant exactly backhand the shifter TOWARDS me. lol

Oh well, I can only see myself pulling the lever UP a gear accidentally, not down... which is a good thing I guess.

csk · #13 (**permalink**) 09-11-2005, 12:38 PM

Quote:

Originally Posted by bimmer_02

why's it called a moneyshift by the way?? :S

Pun on "money shot" maybe? That one brief yet definative action that makes someone a whole pile of money. And just like a money shot, it's proof that you're f**ked now...

marlinspike · #14 (**permalink**) 09-11-2005, 03:00 PM

Shouldn't the rev limiter have kicked in to prevent this?

csk · #15 (**permalink**) 09-11-2005, 03:14 PM

Quote:

Originally Posted by marlinspike

Shouldn't the rev limiter have kicked in to prevent this?

No.

The rev limiter can only prevent you from overrevving because you dumped too much air and fuel into the engine. The rev limiter can't do anything to protect the engine from overreving due to a bad shift because an external force is turning the crank too fast.

I'm too lazy work out the numbers, but here's a scenario: Let's say I redline (7000rpm) in 2nd at 60mph. in 3rd, i need about 4000rpm to hold 60mph. I speed up to 70mph at 5500rpm. Opting for fuel economy, I intend to upshift to 4th, miss and end up in 2nd. Bad things happen: I was already at 7000rpm at 60, plus the 2500rpm i picked up in 3rd. Factor in the difference in gear ratios from 2nd to 3rd, and suddenly my transmission is trying to turn my engine at 10000rpm. I could cut the fuel supply (as the rev limiter does) but that will do nothing to stop my transmission from trying to turn the engine.

Clear as mud?