BMW 2002 FAQ - Weber 38/38 carb.

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Date: 10-16-05 07:02 From: Jim Subject: Weber 38/38 carb.
I have what I believe to be a 32/36 Weber. Would you fellows recommend a switch to the 38/38 Weber? I understand that fuel economy would dip, but the power would go up. What else do I need to know? BTW, THANKS to Karl for his help w/my car yesterday and pinpointing some things that need correcting! TIA guys. JIM

Date: 10-16-05 08:12
From: c.d.iesel in South West Connecticut - Darien = The Right Coast

Subject: 38/38 ? - 32/36 ? which is 'better' ?

(nt)
first off - how do you drive the car - 0-3500 rpm, sitting in traffic, partial throttle most of the time ?

or,

on track with 1/2 to full throttle and 3500 - 6000 rpm ? - that's what the 38/38 carb is for.

What's your exhaust, ignition, compression, intake manifold,
condition of steering, suspension, brakes ? Before you go FASTER - you need to steering and stop 100% and adding a 38/38 means removal of the intake manifold for machining and cleaning - to prevent metal trash entering the motor - no small task.

fix the "stock" set-up first with proper valve clearance, timing, compression, carb adjustments, and you'll be surprised with the power and scatt. maybe your just suffering from throttle linkage that's not opening the carb to the FULL OPEN STOP - have you checked it lately ?
_________________
1976 BMW 2002 #2743711(sorry I sold it 12/25/06)
1986 BMW R65 650cc twin 19k miles
1964 BMW R27 250cc single 15K miles
2002 BMW 325xiTouring 29k miles
1984 MERCEDES-BENZ W123 300D Turbodiesel-188k miles fein-DIESEL

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Date: 10-16-05 09:06
From: tkent02 in Littleton, CO

Subject: The only significant change in mileage is your right foot...

Expect way more low end throttle response with a 38, a touch more top end power, it feels faster more than it is. Therefore much more fun to stomp the gas. Powerwise a well tuned 32/36 can come close, it just doesn't feel as good. Either can get up to 30 mpg on a long mellow highway if tuned perfectly. Maybe 27 without overdrive. If you don't have the time or effort to tune either one expect poor mileage and funky running.
_________________
Tom
Something always leaks.

Date: 10-16-05 09:36 From: Stu Subject: Re: Weber 38/38 carb.
Actually, I think the 38/38 is really superior to the 32/36 for everyday driving around town. The bottom end response is much better, since both valves open at the same time. You don't have to floor it to get it to go.

Date: 10-16-05 10:21 From: HarryPR in Puerto Rico Subject: Re: Weber 38/38 carb.
I agree with Tom and Stu. Low-end response with the 38/38 is much better than with the 32/36. One of the best upgrades I've done to my car... It does lower the gas mileage, but if I were worried about that I would be posting on the Toyota Prius message board instead of here ;-D _________________ HarryPR BMWCCA #19290

Date: 10-16-05 10:58 From: Stu Subject: Re: Weber 38/38 carb.
If I were worried about gas mileage I wouldn't have sold the 38/38 and had my engine performance built with 40 DCOE carbs.

Date: 10-16-05 03:27 From: stevehowe Subject: Should be stamped along the bottom edge as to what type you
have.

Date: 10-16-05 04:03
From: Airmack

Subject: Re: Weber 38/38 carb.

I put a 38/38 with an electric choke in my 74 2002. I love it; car's been running great for over 10,000 miles since I installed it. One very important thing to keep in mind though is the intake manifold. The throttle inlets must be modified to allow the larger 38mm throttle valves to open; if they don't clear, they will bend and would then need to be replaced. Also, a very good gasket between the manifold and carb is essential. I had my manifold machined perfectly flat to prevent any air leakage.

Date: 10-16-05 04:48
From: Benetton in fox island wa

Subject: hhaha me too, sold the 38/38 for dual webers!

Stu wrote:

If I were worried about gas mileage I wouldn't have sold the 38/38 and had my engine performance built with 40 DCOE carbs.

_________________
drive it like you stole it

Date: 10-16-05 05:37 From: 2002maniac in Utah Subject: Re: hhaha me too, sold the 38/38 for dual webers!
38/38 is great for the street! _________________ Formerly known a Cam_A -'91 318is

Date: 10-16-05 07:16 From: Brandon in Western Massachusetts Subject: Re: Weber 38/38 carb.
I had a 38/38 in my '71 and it was a noticable change in performance over the 32/36 I had in my '75. I would recommend it..and I had no problems with it for around town driving either. You do have to machine the intake manifold to fit it properly though. _________________ Jeremy '72 2002Tii - Track Car Need 02 parts? Check out my eBay store: http://stores.ebay.com/Davenport-Motorsports

Date: 5-7-07 04:38
From: Frederick
Subject: fyyup

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