Weber 48IDA on Stockport 12a
 

Ok, so looking at RacingBeat's recommendations for the 48IDA setup, it should not be bolted to a 12a stockport. The "lowest" it can be bolted to is a 12a StreetPort.

Venturi: 37mm
Fuel Jet: 170
Air Jet: 150
E-Tube: F-11
Needle Valve: 250



I know it would probably not work with a stockport (and will probably end up with SP jetting) but what would be "comparable" jetting for a stock port?

see if you can find the jetting specs for the dellorto dhla 48mm they sold. I had this on my stock 12a wit hr.b jetting and it did great hell it helped out my mpg even. then after i built my large street port 12a i just rejetted it and blam. I had a a/f meter and if i ran the stock port jetting it would run lean on the higher rpms but did fine under normal driving. i even kept them in a ziplock bag in the glovebox so i could rejet when i was going on a long trip.... mpgs. I was getting over 20mpg on the stock jetting and around 12mpg with the jetting i had for the street port.

I had 34mpg in the city with the Nikki. I got a buddy with a Dell 48, I will see what jetting he had. The thing with Dells, is that the 48 is equiv to a 47 weber. Oh well, I was going to run SP jets with my Stockport, so it shouldn't be bad.

I'll let you guys know what jets he has, for searching things.

a good starting point:

40 venturies
150 air
200 main
65 main jet

be sure to ditch the filter @ IDA's inlet.

Too bad, I couldnt find the video when my bro's SA went heads up with a S2000 on the freeway. This with a stock 12-A, 48 IDA and dual exhaust (used a stock motor after he blew the 12-A monster streetport).

im about to pick up a nice gs with a stockport rebuild with 10k and it's running a weber 48 and it runs great. it seems like that would be a little bigger than the dellorto 48 but i dont know what jets he's using.i'll try and find out if you want.

Thanks wacky. I got everything but the filter comment. Are you talking about the screen filter inside the carb?

Yes please!

Yes he is..and drill out the inlet to the fuel bowl....am running a 48 IDA on a large SP 12A and it is way too much fun....getting shitty mileage atm, but after I change the jets, it will easily get 200+ miles on a full tank, depending on your right foot....

Inlets for the fuel bowl? I haven't heard of much modifying for the IDA, besides the 3rd progression hole and adding a fuel bowl extension...

I assume you mean to enlarge the passage in the carb where the fuel gets into the bowl? Wouldn't I need a larger needle?

PS: Currently rockin out on 400+ miles a tank if I can keep out of it :)

400 a tank, Jeezus is right! porting = yummy fuel.
But yes, under the screen, the tapered hole can be bored out....needle doesn't NEED to be swapped on stockorts, but I recommend a #300 needle. Not a fan of Grossejets...

Haha, yeah. I am gonna miss the fuel mileage, but that is why I have my daily driver.

EDIT: This is the IDA thread, not the QJet...

Jeezus
here are some links i followed when i picked up my 48ida, give them as read through and pic and choose what you feel like modifing

these guys make it to the 51 ida but all the mods are here
http://www.vwtrendsweb.com/tech/0308...ce_weber_carb/

heres a good one on general rebuilding
http://www.aircooled.net/gnrlsite/re...idarebuild.htm

Your comparing sidedraft to downdraft. Different beasts but the Dell is a 48mm carb. Bolts to the same flange as weber DCOE.

Go to this link to see what the jetting for stockport and SP 12as are for Dells gruntled.

Maybe you get that IDA on your stockport and you can keep up with me on the next meet :)

I'm no expert but wouldn't a 48 ida be huge for a stockport 12a? Unless you run smaller jets etc... I only thought you'd run an ida on an extend port or above? People over here just run jetted nikki's/ 4 barrels on the smaller ports.

thats the advantage of a 48 IDA. It has removeable venturies so it will work on most application. You buy it once and thats it. I use a nikki carb as a door stop. :lol::lol::lol:

Yes just use the 37mm chokes and no it's not too big a carb. Jet it and you'll be fine. Great carb. Throttle response amazing.

Haha bloody rich americans :lol::lol: send a few 'doorstops' over here you'll be able to fork them off for some $$$

Hey wack, would the F11 Etube be good?

Also, how did the 7 do against the S2000?

F11 is the de facto etube for rotormotor.

f-11 is great for stock port driveability adn good gasmileage, but it will cause transition problems especially on a stock port 12a. you'll get good gas mileage, but you're going to have a lean stumble at 3000 rpm cruise. If you want to get rid of the cruise stumble you will have to degraded gasmileage.

^^If I lose mileage thats alright. I want the jets and whatnot to be "tuned" more for mid to high RPM.

I am going to go with what Whacky says:

40 venturies
150 air
200 main
65 main jet (is this idle jet? 65F9? 65F7?}
F11 emulsion tube

Looks like I have:

F7 emulsion tubes
135 main
120 air

F10/70
120

I'll sell you my f-11's for $35 shipped. I don't want them anymore... pm me

Bump. Going to be getting my jets in this week. I am ready to order the parts, but the Main Jets are holding me back. Do I get the 65F9 or what 65F#?

Also, I do not want the 3000 rpm stumble, so if I lose a mile or two a gallon that is fine. After F11 the next rich e-tube is the F7, correct?

I am sooo ready to order this stuff and get her on!

Midweek bump.

Final bump. Someone somewhere has to know something!

Wacky?
Hyper?

sorry, I just found this thread. whats the question? just PM me

XXF10 is the #

Any updates Jeezus on getting this carb to work well in your stockport 12a?

None yet, just trying to get the jettings down before I buy them.

I ran a weber 48mmDCOE on my stockport 12a for a while. It ran like a bat out of hell above 3500, ran like complete crap below that. I played with jets and what not for quite a while. The idle wasn't that great cause it was large and it will bog/stumble if you get on the gas below 3 grand. It would start ok with 3 to 5 pumps of the pedal. I replaced that with a 45mm that started and ran alot nicer for a daily driver, but just didnt pull hard up top like the 48 did. If you can live with the really crappy low end, it will scream up top well past 7k.

its all in the tuning...

IMHO, a 45 is a waste of hard earned cash. It looks nicer than a Nikki but performance wise, I'm not impressed. Ask mazda83 for his opinion. he upgraded from a 45 to a 48 IDA plus he has ridden in that SA with stock 12-A and IDA.

Sounds nice, so the car would die if you are at a light and dont keep revving it with the 48 in a stockport ?

You dont have any dyno runs with both setups, do you? Can you estimate how much hp you got over the 45 with the 48 in top end?

Thanks.

For a IDA carb only use F10 idle jets. The air bleed for the idle jets is in the idle jet holder. Run 65f10 idle jets with 120 idle jet holders.

wacky's right, don't fall into the spell of a 45 weber:jerkit:...i had a 45, and my car ran like crap:icon_tdow...the 48 is the way to go...i just put mine on a couple of weeks ago and i am very happy with it, it even gives your exhaust a better deep sound... it's just the way to go...and there's alot of advantages if you get the 48... for example, easy to work on:icon_tup:, easy to take apart:icon_tup:, can tune it to any setup you want to upgrade in the future:icon_tup:...if you don't believe me, test drive a 45 then a 48... The SA with the stock 12-A and 48IDA was one of the most impressive runs almost crapped myself on the canyon run:lol:

it's all in the tunning...

There is always the dellorto 48 DHLA..they fixed the issues...put a choke..mine runs good below 3 grand..doesn't stumble..as long as you don't try to floor it from stop..it doesn't bog...and above 3 grand..its a bat out of hell...

Slammed gsl finally told me that he loves his finally tuned yaw..but driving mine the other day..there is a noticeable power difference...now he's going 13b and a weber 48..

One of the things a lot of folks don't understand about progressive 2 barrels like
webers, dellortos, mikunis, etc is that for a stock port rotary you have to use the
right sized venturis so that the idle and the progression circuits work well upto full throttle.

Lots of times folks put a 48 whatever on there with the biggest venturi on a stock
port and then get upset when it doesn't perform well except at WOT. The problem is
without a smaller venturi in there at idle the stock port can't get enough velocity for
the air and fule to mix.

n0ferz, the car would idle fine with the 48. It just had to be set a little higher, like around 1000 to really be happy. As wackyracer said, i didn't enjoy the 45mm. As for seat of the pants dyno, i would say the 48 put down around 15 extra horses, especially in third. The carb transitioned alot better in third fourth and fifth than it did in the lower gears because the rpm changes so quickly in first and second.

Ok, so F11 E tubes
65F10 idle jet
120 holders
37mm Chokes


135 main
120 air

All correct? I will be ordering them tonight if this is good. I tried PMing Rotaryshack to see his recommendations and if he sells the jets but still no answer :(

Thanks to everyone so far!

Very nice, 15 extra HP over the 45:icon_tup:....I will start saving to buy a 48 IDA just for the hell of it.:lol:

you need atleast 170's for your mains. Let me know what you need i have some extra jets lying around i'll let go cheap since they're just dead weight to me.

As I always recommend, invest on index and number drill bits. Drill them out until you find the size that fits your driving habit. then go to the partshouse and purchase the correct size. this is what you do when the 48 IDA you just purchased came with VW specs (smaller jets etc etc)

There is a great deal on ebay under "weber jets" from 'carbpartsdirect'(which is actually pierce manifolds) They will sell you 24 mains for $25 plus shipping, IIRC about $10 for 2 day. They were all 115's when I got them so you can punch them out to anything usable for us.

By the way, I had just had a full bridgeport 12A on the dyno this week. We are forced to run 40mm vents but I got the AFR flat at 13.5 from 4000-9500rpm with 240 mains, 170 airs, F11's. If the car gets below 4K rpm when its running we have bigger problems than afr's but it was just a little rich down low.

You can make these carbs work on just about anything.

they are good guys too. stay the hell away from weberpartsdirect and carbs unlimited.

The RX-4 that we sold early 08 had a bridgeported TII block with 51 IDA. I had 45 venturies on it and that puppy was a beast on the freeway. that was just during break-in period and not fully tuned to its potential. Too bad, it was sold

http://img.photobucket.com/albums/v3...3/DSC00161.jpg
http://img.photobucket.com/albums/v3...3/DSC00164.jpg

yeah too bad it was sold:( great looking car...

Jeezus. Clear out your PM inbox and your sent items. I'm posting my reply to your PM here.
Goodnight.

yea that's about right. you might be able to go smaller on the mains stay between 170-200 and keep the air correctors between 120-170. It all depends on how strong your engine still is, and your elevation, how humid your area is. That's why noone can just give you a gaurenteed setup. $35 shipped for the e-tubes.

i replied to his pm too.. i think he is trying to buy one set of jets one time and have the car run perfect. not going to happen.. each car is different so your going to need to buy a combination of jets and play around until you find your cars sweet spot. te most we can do is point you in the right direction :)