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Old 02-16-2009, 01:50 AM   #1
007WRX
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Default Need Opinions: Corolla Content

I'm going to start ripping the engine out of my corolla next week. It is 1986 SR5 Automatic. I'll be replacing the the automatic with a 5speed, obviously, and going to drop in the OEM gts 4age. Now I have to decide which route I want to go. I can either:

1. 4age EFI, install everything from another GTS parts car.

2. 4age Carbeurated. Will consist of a custom Intake Manifold with Dual sidedraft carb setup. Probably would be some Mikuni 41mm or Weber 44mm.

My only hesitation with doing the carbeurator swap on the 4age is the ability to get it running properly. But I realize once set-up properly, will produce more power and a nicer, more adjustable power band with regards to Intake Manifold Length and the Carb Velocity stack length.

Here is simple picture for people unsure of Dual Carb Setups:





If anyone has any insight to dual carb setups, please share your thoughts.

Thanks!
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Last edited by 007WRX; 02-16-2009 at 01:56 AM.
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Old 02-16-2009, 01:56 AM   #2
truenosan
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IIRC isn't the ITB's still EFI? It just usually needs a standalone ECU to run it.

and if we have to, overnight parts from Japan.
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Old 02-16-2009, 01:57 AM   #3
007WRX
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I am not talking about an ITB setup.
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Old 02-16-2009, 02:05 AM   #4
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ITBs FTW 20V blacktop Ryan, do it, do it.
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Old 02-16-2009, 02:08 AM   #5
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I need to look more clearly, just glancing, those sure look like ITB's

I remember in my corolla days, a lot of guys were debating going carbs, but it doesn't seem worth it in the end.
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Old 02-16-2009, 02:09 AM   #6
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I had dual mikunies running in my 87 CRX I loved them but had many issue's trying to get them dialed in or even someone able to get them running. You should be able to find a intake manifold on ebay TRD and I think weber had one available to.
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Old 02-16-2009, 02:10 AM   #7
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Quote:
Originally Posted by truenosan View Post
I need to look more clearly, just glancing, those sure look like ITB's
Those are carbs Jonny (No injectors, fuel bowls)
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Old 02-16-2009, 02:14 AM   #8
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Quote:
Originally Posted by semaj View Post
ITBs FTW 20V blacktop Ryan, do it, do it.
Its not worth it with regards to dollar to power ratio.
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Old 02-16-2009, 02:15 AM   #9
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Quote:
Originally Posted by dasnowman View Post
I had dual mikunies running in my 87 CRX I loved them but had many issue's trying to get them dialed in or even someone able to get them running. You should be able to find a intake manifold on ebay TRD and I think weber had one available to.
So once it was all up and dialed in, it ran great? How was startup on colder days etc?

What were you running for ignition?
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Old 02-16-2009, 02:16 AM   #10
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Quote:
Originally Posted by 007WRX View Post
Its not worth it with regards to dollar to power ratio.
Well if you're going to talk dollar to power, then you should be talking 4AGZE or 4AG turbo
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Old 02-16-2009, 02:17 AM   #11
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This is a low cost project. One day maybe, I just want something to drive around in thats fun.

Diff will be welded too
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Old 02-16-2009, 02:22 AM   #12
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just from a general perspective (not corolla specific) i find that carbs are a pain to deal with. Have you ever tuned a carb? let alone two carbs that need to work parallel with each other...?

from when i was driving the brat daily i quickly learned that carbs blow and need constant attention to be maintained. EFI (if you can get past the wiring) is way better.
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Old 02-16-2009, 02:26 AM   #13
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I have found tons of information about setting them up properly so I'd be willing to give it a shot. I know what you mean about them being brutal, but I don't really think you can compare this type of carbuerator to the carb on your old brat, or even the one on the car at the present time.

The wiring wouldn't really be an issue, as everything from a GTS will work without any modification.
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Old 02-16-2009, 02:38 AM   #14
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Quote:
Originally Posted by 007WRX View Post
I have found tons of information about setting them up properly so I'd be willing to give it a shot. I know what you mean about them being brutal, but I don't really think you can compare this type of carbuerator to the carb on your old brat, or even the one on the car at the present time.

The wiring wouldn't really be an issue, as everything from a GTS will work without any modification.
you're right, i can't really compare mikuni 41's to the old hitachi carb or the weber 32/36 and i really can't compare it to the MPFI system on it now.

i have worked on datsun 510s with dual weber 44 side draft carbs. I'm not spewing info without first hand knowledge. tuning a carb is more of an art than a skill. reading about how to do it helps, but when it comes down to it without experience it is extremely difficult to do.

if you have somebody who has tuned these systems properly that can be there with you to help set it all up then go for it.
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Old 02-16-2009, 02:43 AM   #15
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Ah yes indeed. I'm more than willing to give a go though, can't learn without trying it. There are many carb setups for sale on club4ag.com, idealy, I'd like to buy one properly jetted and make the minor modifications to make it suited to my setup.

I've read the webers are quite finicky compared to Mikunis, any thoughts on which is better brand if I go that route?
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Old 02-16-2009, 02:55 AM   #16
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i've only dealt with hitachi and weber. For your application i really can't give an opinion as to which carb setup to go with. I would opt for the webers because it's a carb that i know however in your situation my opinion is irrelevant.

do what you want, be who you wanna be.
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Old 02-16-2009, 02:56 AM   #17
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IMO carbs will be much less work. if the cars not EFI it will be a PITA to convert it.

i know a local guy whos a great mechanic and im sure he would be able to get it running just fine.
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Old 02-16-2009, 02:57 AM   #18
007WRX
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Quote:
Originally Posted by Zefy View Post
do what you want, be who you wanna be.


Running the carbs on the new engine isn't a bad process. I need an inline fuel pump, new fuel lines, a fuel pressure regulartor, and I need to lock the distributer out at around 30degree.

Of course there are other minor things needed to be done. I'd like a more unique type setup too kind of, ya know.
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Old 02-16-2009, 03:00 AM   #19
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I do believe I might have an engine too, Bluetop 7rib off dorikaze.
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Old 02-16-2009, 03:11 AM   #20
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just make a custom manifold and run some kind of edelbrock 4-barrel or something. now that would be unique.
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Old 02-16-2009, 04:44 AM   #21
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Drop an F20C or F22C in there. Some guy in Vancouver has a Corolla running around with one. It's blazin' fast.
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Old 02-16-2009, 10:21 AM   #22
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If you're looking for something that requires a bit of fiddling every so often, then go with the carbs. It's a project, not a daily-driver. They can be a pain, but it is awfully satisfying to get them just right.
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Old 02-16-2009, 11:04 AM   #23
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EJ20 swap with rearwheel conversion

make it just like how all the new Toyo Subbies are gonna be, Toyo styling Subbie power


what? no?
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Old 02-16-2009, 12:39 PM   #24
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Quote:
Originally Posted by alcoolaid View Post
Drop an F20C or F22C in there. Some guy in Vancouver has a Corolla running around with one. It's blazin' fast.
theres at least 4 here in the lower mainland as I know the guy who did those swaps.
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Old 02-16-2009, 12:44 PM   #25
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Personally I would go with EFI. Carbs are finicky, the jet requires regular adjustment, it doesn't correct for temp or altitude.

The only thing good about them is that they are easier to work.

I believe a member on this forum actually owns one of those S2k powered Corolla.
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