Weber converted m10's

e21-Mark · Post by **e21-Mark** » Thu Jul 08, 2010 6:11 pm

Your opinions / experience please guys.

HarryPR · Post by **HarryPR** » Thu Jul 08, 2010 6:34 pm

I replaced the problematic FI on my US version 320i and couldn't be happier.

Fuel economy has improved, and so has performance. Maybe a brend new 320i had better performance, but by now wear and tear had taken its toll on the FI performance. I just used a 2002 manifold with a 32/36 and even left the injectors in place. Fuel delivery is via a low-pressure aftermarket electric pump.

DC · Post by DC » Thu Jul 08, 2010 7:48 pm

downdraft - best for street car
sidedraft - good for racing and super sound but worse fuel economy

tommi_e21 · Post by **tommi_e21** » Sat Jul 10, 2010 10:12 am

gotta be side draft all day long, sound and torque change the M10 massivly!
but what can i say i just sold my webers to make way for turbo kit lol

petroscf · Post by **petroscf** » Mon Jul 12, 2010 10:58 am

Mark, as you understand, I will look for this post again and then vote, in about 3-4 months...(maybe more, if I don't fit the carb as soon as I get them)
Hope to vote on the second choice, though

Reck · Post by **Reck** » Mon Jul 12, 2010 8:30 pm

Better MPG.. Cutting out at high speeds though. That may yet be traced back to the fuel pump though.

petroscf · Post by **petroscf** » Tue Jul 13, 2010 9:08 am

Reck wrote:Better MPG.. Cutting out at high speeds though. That may yet be traced back to the fuel pump though.

Sorry for my bad english, but what do you mean by "cutting out at high speeds" ?
You mean that the better economy mentioned above ("better MPG") is cut out at high speeds, or do you mean that the car cuts out in high speeds, so this equals to worse performance?
If it is the 1st, then this is not bad, it is more sincere IMHO, this means that this carb can give you economy if want, or performance if you prefer..
It would be much worse if you had worse economy at low speeds, and also worse performance at high speeds...
All this is a question, as I just ordered a weber carb from Mark and I am trying to foresee what to expect when I fit it on the car...

e21-Mark · Post by **e21-Mark** » Tue Jul 13, 2010 10:53 am

Cutting out at high speeds is most likely down to a failing fuel pump and fuel starvation. It's certainly not normal.

Pistonheader was the last person I recall fitting an m10 with a Weber and he loves it. You will too Petroscf.

petroscf · Post by **petroscf** » Tue Jul 13, 2010 10:56 am

can't wait to fit it and take the BM out for a drive!!!
Then I'll vote! TWICE!!!!!

nas80 · Post by **nas80** » Tue Jul 13, 2010 6:11 pm

standard car the carb was crap - then i put the 32/34 dmtl weber on and now it can actually do wheel spins! dont get me wrong it still doesnt have enough power lol

PK · Post by PK » Tue Jul 13, 2010 10:22 pm

my weber is amazing untill i push the accelerator a little and then it splutters and misses.

My car won't even start now. the fuel pump has died on me i think

humph

ill write this up when i actually have an answer to the pol ;]

pistonheader · Post by **pistonheader** » Thu Jul 15, 2010 4:17 pm

RetroBeemer wrote:Pistonheader was the last person I recall fitting an m10 with a Weber and he loves it. You will too Petroscf.

it transformed the car's cold starting (it now starts 1st turn of the engine, even in the winter in -8deg celcius after having been left for 8 days...it only took 1-2 secs to start), improved the economy if driven normally (driven hard, it's probably worse, but you get better performance), and it makes a much better noise. what's not to like?

the only time it was struggling to start was due to crappy spark plugs.

i still yearn for more power though

HarryPR · Post by **HarryPR** » Thu Jul 15, 2010 6:01 pm

Over at the BMW2002FAQ message board there is a jetting prescription for 32/36 carbs that has been used by many with great success.

It is supposed to improve performance and gas mileage. I haven't tried it, but might do so soon.

Here's the link:

http://www.bmw2002faq.com/content/view/62/32/

PeteK · Post by **PeteK** » Fri Jul 16, 2010 10:12 pm

I don't have webers, but I replaced the old mech injection with EFI and quad throttle bodies (kind of like dual SD webers I guess). It was bloody good. Didn't make enormous amounts more power, but it was much more even across the rev range. Probably a few more $ than webbers, but nice to have for future upgrades.

Cheers

petroscf · Post by **petroscf** » Tue Jul 20, 2010 10:59 am

is it also required to convert from automatic to manual choke as well? Or are there Webers to fit cars with automatic choke?
(I don't think that any E21 with carb had manual choke from factory, at least mine didn't-and it's an early model...could BMW go back later on?)
I just got the 28/36 but it has got a manual choke, so I can't replace my solex which is automatic........................opinions?

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