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Carby upgrade advice
https://www.auszookers.com/forum/viewtopic.php?f=5&t=56118
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Author:  Jgladman [ Sun Nov 10, 2019 8:49 pm ]
Post subject:  Carby upgrade advice

Hey guys looking at upgrading the carby on my 1.3L sierra, what is generally the most common upgrade and what do people suggest? Cheers

Author:  fordem [ Mon Nov 11, 2019 12:25 am ]
Post subject:  Re: Carby upgrade advice

Did you consider a search, this has to be one of the more commonly asked (and answered) questions - Toyota Corolla carb is the answer.

Author:  bumstein [ Mon Nov 11, 2019 8:22 am ]
Post subject:  Re: Carby upgrade advice

In the good tech section you’ll find some info on the 4K carby Fordem is talking about. All you need to know is there really. Some people go for a Weber copy which give a slight increase in power but they suffer on steep inclines. Might be an option depending on what you use your car for

Author:  Jgladman [ Mon Nov 11, 2019 7:01 pm ]
Post subject:  Re: Carby upgrade advice

bumstein wrote:
In the good tech section you’ll find some info on the 4K carby Fordem is talking about. All you need to know is there really. Some people go for a Weber copy which give a slight increase in power but they suffer on steep inclines. Might be an option depending on what you use your car for


Yea I'll do some searching thanks. I'm going to be using it mainly for 4x4ing, nothing to hard but I would say a fair few hill climbs in the areas I go, so maybe the weber isn't the go. Is that the same with the corolla carb?

Author:  tanshi [ Tue Nov 12, 2019 8:03 am ]
Post subject:  Re: Carby upgrade advice

there is no need to upgrade the carby with another carby. Just rebuild the stock one. if you want more power go EFI

Author:  bumstein [ Tue Nov 12, 2019 8:36 am ]
Post subject:  Re: Carby upgrade advice

Jgladman wrote:
I'm going to be using it mainly for 4x4ing


Then I’d suggest not to go the Weber. They’re set up differently and will over-fuel on either inclines or declines depending on type. I’ve run a Weber on two Sierra’s. While they’re ok for highway, off road (and I’m talking about mild 4wding, not even difficult stuff) it was rubbish.

The 3k or 4K carby are cheap, simple and work well. I think that’s the go.

As Tanshi says, EFI is a great option however it’s a more difficult conversion. Up to you if you want to consider it, although if you’re looking at concerting ti EFI then why not convert to a G16B while you’re at it? Then the whole thing becomes a big project. $100 and a bit of time will have your car running great while you consider long term improvements like EFI.

I advise against rebuilding the stock carby. IMO they’re old, worn out and not worth rebuilding. I spent around $550 having a carby guru rebuild my stock carby and it still doesn’t run right. It was good for a while (not great, but good) but now I’m replacing it with a 4K carby that cost me $85 delivered. I should have done that it the first place I reckon

Author:  Brenno [ Tue Nov 12, 2019 8:45 pm ]
Post subject:  Re: Carby upgrade advice

Can you do this 4k carby upgrade on a g16a?

Author:  MrRocky [ Tue Nov 12, 2019 11:05 pm ]
Post subject:  Re: Carby upgrade advice

I would assume same same

Author:  Jgladman [ Tue Nov 19, 2019 3:57 pm ]
Post subject:  Re: Carby upgrade advice

bumstein wrote:
Jgladman wrote:
I'm going to be using it mainly for 4x4ing


Then I’d suggest not to go the Weber. They’re set up differently and will over-fuel on either inclines or declines depending on type. I’ve run a Weber on two Sierra’s. While they’re ok for highway, off road (and I’m talking about mild 4wding, not even difficult stuff) it was rubbish.

The 3k or 4K carby are cheap, simple and work well. I think that’s the go.

As Tanshi says, EFI is a great option however it’s a more difficult conversion. Up to you if you want to consider it, although if you’re looking at concerting ti EFI then why not convert to a G16B while you’re at it? Then the whole thing becomes a big project. $100 and a bit of time will have your car running great while you consider long term improvements like EFI.

I advise against rebuilding the stock carby. IMO they’re old, worn out and not worth rebuilding. I spent around $550 having a carby guru rebuild my stock carby and it still doesn’t run right. It was good for a while (not great, but good) but now I’m replacing it with a 4K carby that cost me $85 delivered. I should have done that it the first place I reckon


I'll be using my zook for 4x4ing so I can rule the weber out. How does the 3k 4k carby go 4x4ing also any good websites you recommend for kits?

Author:  bumstein [ Tue Nov 19, 2019 5:17 pm ]
Post subject:  Re: Carby upgrade advice

They should be perfectly fine 4wding. They’re almost the same carby as the original, made by the same manufacturer, except it doesn’t have the excessively complicated choke systems. They just work.

Hit up eBay for the carby. I got mine for $85 delivered, mostly they’re between 90 and 100 clams.

Peruse the ‘Good Tech’ section and there’s a thread that will give you some good info on them. Usually have to make a bracket for the accel cable.

There’s some discussion on here about changing carby jets to run them on the Sierra, I’m not going to advise on this, but there’s threads if you want to confuse matters

Good luck!

Author:  Jack jr [ Tue Nov 19, 2019 5:49 pm ]
Post subject:  Re: Carby upgrade advice

G'day i have a 4k on my sierra it is mostly good off road but dose have problems on very steep slopes if it stalls, but its way better then the Weber off road.
Cheers Jack.

Author:  bumstein [ Tue Nov 19, 2019 7:00 pm ]
Post subject:  Re: Carby upgrade advice

Jack jr wrote:
it is mostly good off road but dose have problems on very steep slopes if it stalls.


Does the steep slopes make it stall or is it difficult to start again if it stalls? Inclines, declines or both? What kind of angles?

Author:  MrRocky [ Tue Nov 19, 2019 9:15 pm ]
Post subject:  Re: Carby upgrade advice

No dramas on angles with my new $90 ebay 4k carb
Certainly alot better than any stock sierra carb rebuilt or otherwise

Author:  Jack jr [ Tue Nov 19, 2019 10:08 pm ]
Post subject:  Re: Carby upgrade advice

My carby was an eBay 4k and it would run ok on slopes with a few revs on but would run rough/ try to stop at idle and would flood if stalled but that was only on very steep tracks.

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