1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

weber 48 dco

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Old Jul 8, 2014 | 09:02 PM
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From: pennsylvania
weber 48 dco

I posted something about carbs a while back. Im running a weber setup on my 91 fc. Just curious onwhat other setups people are running with webers. Jetting, venturi, distributor, ignition all that awesome stuff. Mines a little touchy cant seem to get it to run quite right.
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Old Jul 9, 2014 | 04:31 PM
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it would probably be more helpful if you posted yours. also share what timing you're running and your exhaust.

although you have a Gen II, you should probably look through the Gen I section of the board. many more guys run Webers there than the other sections.
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Old Jul 9, 2014 | 05:10 PM
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From: FL
i can't edit in this section ....

anyway, i just decided to move the whole thread rather than have you start a new one for the same thing. once you post how your carbie is currently set up, you should probably get much better help here.
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Old Jul 9, 2014 | 05:35 PM
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From: https://www2.mazda.com/en/100th/
i <3 my weber. it takes some tuning, but once you get it dialed, its really consistent.
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Old Jul 9, 2014 | 11:16 PM
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Originally Posted by j9fd3s
i <3 my weber. it takes some tuning, but once you get it dialed, its really consistent.
What do you mean by "<3?" Im a newb with these codes lol
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Old Jul 10, 2014 | 10:23 AM
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surely a professional internet **** king like yourself is not serious, Siraniko ... even a boring, old fart like me knows what that is.
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Old Jul 10, 2014 | 10:24 AM
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What is it? I dont text despite i postwhore lol
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Old Jul 10, 2014 | 10:40 AM
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Im running with tbe fb distributor. I've got the racing beat six port intake with the racing beat headers. Im running a 60f9 idle. F7 emulsion tubes 210 air corrector jets. I've also got a rather large street port. I love the carb just haven't gotten it dialed in perfectly yet.
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Old Jul 10, 2014 | 07:26 PM
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From: FL
Originally Posted by Siraniko
What is it? I dont text despite i postwhore lol
"love" ... it's a sideways heart. no text messaging? you and me both ... my phone still "flips" and everyone give me **** about it.
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Old Jul 10, 2014 | 07:37 PM
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Thanks man. Yeah i rather call than text lol
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Old Jul 10, 2014 | 07:50 PM
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Originally Posted by cj120
Im running with tbe fb distributor. I've got the racing beat six port intake with the racing beat headers. Im running a 60f9 idle. F7 emulsion tubes 210 air corrector jets. I've also got a rather large street port. I love the carb just haven't gotten it dialed in perfectly yet.
mains?
chokes?

also, what is the car doing or not doing? just saying it's "a little touchy" is too vague.
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Old Jul 13, 2014 | 11:58 PM
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Ahh sorry I haven't replied, cook life equals no life. I'll look at the mains tomorrow and let you know. Can't recall off the top of my head. The biggest problem with it is it stutters especially in first, also if you're cruising at one speed and ease off the throttle to slow. Sorta makes me think the timing may be a little off. I've had a light on it. Its pretty advanced not sure of exact degree. The guy I bought it from has custom marks set up.
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Old Jul 14, 2014 | 11:33 AM
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Originally Posted by diabolical1

"love" ... it's a sideways heart. no text messaging? you and me both ... my phone still "flips" and everyone give me **** about it.
Flip phone- u barbarian lol

Sent from my iPad using RX7Club. how bout that!
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Old Jul 14, 2014 | 02:15 PM
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Im more or less just curious as to what setups others are running.
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Old Jul 14, 2014 | 02:53 PM
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you'll need to verify where the timing is and adjust accordingly. do that before you start messing with the carbie. there is a chart of recommendations on the RB site.

https://www.rx7club.com/new-member-r...48-13b-931661/
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Old Jul 14, 2014 | 03:06 PM
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Nice awesome info. One thing I've noticed more recently is a considerable rise in rpm if I pump the brakes
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Old Jul 14, 2014 | 03:09 PM
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Also my mains are 230 with f7 emulsion and 210 air corrector
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Old Jul 14, 2014 | 11:00 PM
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Stop being lazy and check the venturies for size.
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Old Jul 20, 2014 | 12:13 AM
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Right now chokes are 42mm. The carb was supposed to have been made specifically for my porting by the guys out at the rotary shack. 60f9 idle gives me awesome cruise but leans out around 3k. 65f9 gives me great power all the way through the throttle however I cant cruise. Starts to stumble and jerk a lot at slight throttle.
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Old Jul 20, 2014 | 01:06 PM
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From: https://www2.mazda.com/en/100th/
i would try a smaller air corrector.
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Old Jul 21, 2014 | 08:43 AM
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Richen or use a larger idle jet to richen the mixture. i have index/number drill bits for this reason
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Old Jul 22, 2014 | 10:25 AM
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Someone a while back said that adding an extra progression hole was necessary.
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Old Jul 22, 2014 | 11:10 AM
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From: https://www2.mazda.com/en/100th/
Originally Posted by cj120
Someone a while back said that adding an extra progression hole was necessary.
older weber carbs have an idle hole, and 2 progression holes. if you pulled your carb off an looked at it, you would probably find that you are actually idling on the 1st progression hole, and not the idle hole.

the later webers have a 3rd progression hole, which lets you idle on the 1st progression hole, and still have 2 to transition to the main circuit.

or you can just get the main circuit to start working sooner with a smaller air...
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Old Jul 22, 2014 | 02:16 PM
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Good point. I forget about the progression holes
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Old Jul 22, 2014 | 02:33 PM
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I am idling around 1k rpm due to a large street port, sleeved exhaust port around the size of a t2 port, and all intake ports open.
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