What carburetors are suitable for a turbo setup

[NZAE92]

ok
im thinking of turboing the 4AF
and for everyone who thinks it's a waste of time i really don't care
i like being different and in my eyes i think it would go hard
down to business.
i have found a weber carb for sale here is the link
http://www.trademe.co.nz/Trade-Me-Mo...-233122259.htm
could someone tell me if that would work on my car and it's only $20
thats 13 bucks usd im not trying to be cheap but if it's worth more then thats great
any suggestions,points or help
is very much appreciated
cheers
Greg

[4agetercel]

not that i think its a waste of time but, is it possible? ive seen 4ac's turbo but how does the engine know to shoot more gas in without management?

honestly i dont see it working without fuel injection, and if it does really how much boost can you run? 3, 4psi maybe before you lean it out and burn holes in your pistons and valves

[NZAE92]

yea it is possible
i think someone on here has done it before and u don't need fuel injection for a turbo anythings possible theres a tickford ford capri thats turboed with a carb
but all i need is patience and alot of time but i really need members help on deciding if i should get that carb in the link since it's so cheap or what is decent for a new carb or used im not sure
please help

[4agetercel]

probubly not if its so cheap, weber carbs are usually more than that

[Donald]

I believe that there are two ways to turbo a carb engine. One is to have the N/A carb upstream of the turbo intake, the other way is to have a pressurized carb, or a N/A carb in a pressure box, down stream of the turbo. Either way the carb works normally, but the really fun part is getting the jetting right so as to not cook your pistons or valves.

[REN69]

Flashmn will probably chime in on this thread, I'm pretty sure he had a few carbs with his turbo 4AF setup before he decided to switch to EFI.

[NZAE92]

i knew there was someone on tn that had turboed there 4af i need flash to tell me how he had done it.
did he change the carb i will have to find out once he pops in on this thread
finally someone can give me some good pointers cause they have done it aswell
im happy lol

[Rookie_One]

Originally Posted by NZAE92

i knew there was someone on tn that had turboed there 4af i need flash to tell me how he had done it.
did he change the carb i will have to find out once he pops in on this thread
finally someone can give me some good pointers cause they have done it aswell
im happy lol

flash did it with a 4A-FE, not a 4A-F

[Flashmn]

I never had carbs with my turbo setup. They're so limited.
However, you can pull it off with almost any carb, even the stock one.

Rookie_one, my base engine was a 4A-F

[NZAE92]

ok so u only used the base engine why did u use the base and has n e one turboed a 4AF engine like the whole thing cause i am skating on thin ice here im trying to do more research on turboing the engine but need more help and guidance

[REN69]

Originally Posted by Flashmn

I never had carbs with my turbo setup. They're so limited.
However, you can pull it off with almost any carb, even the stock one.

Rookie_one, my base engine was a 4A-F

that's right! yeah, didn't your motor start as a 4AF then you modded it to accept the EFI system right?

[NZAE92]

so getting back on topic
should i snatch that weber up or what else should i search for thats suitable

[canadianae92]

I think whatever carb you use, it needs to be modified for blowthrough, I'm not sure on the particulars of this weber or the factory 4af carbs. I'm also not a big carb wiz just very basic knowledge. I would vote for a aftermarket unit....

There is a mustang in winnipeg running carbs making over 1000hp twin turbo.... who refuses to use efi... Obviously there has been success elsewhere with carbs/turbo, some factory cars came with carb/turbo also...

I don't know if i contributed to your previous thread but I'll throw out some stuff I've picked up since I'm going to be putting together a turbo setup through the winter but I will be using megasquirt/edis 4 I think.

DIY making a Manual boost controler http://www.geocities.com/chmwatson/FAQs/mbc.html

Ebay intercoolers are cheap... have someone local help put together a manifold for you, if you can't do it(SOMEONE EXPERIENCED). Buy the flanges that you can and piping... guide http://www.sdsefi.com/techheader.htm... or ebay manifold and modify turbo flange if you have to....

You said you have a turbo, does it have an internal wastegate? If it does then lucky you because it seems to me external waste gates = $$

Anyways do a lot of reading on turbo/carb the newer age people won't have a clue on carbs for the most part because of how good efi is. So look into hot rodder/old school theories maybe read some of the old books that exsist, a lot of info is out there. Carb isn't any more of a pain than efi(talking aftermarket management) if you know what you're doing but a lot of people simply stay away from carbs for all sorts of reasons and not all of them good. I suggest finding someone local who is a carb wiz to aid you..

You will need to upgrade the fuel system if you want to be safe btw... even for low boost... Unless someone has experience on low boost with 4af carb stock fuel system which I doubt. Better to be safe than sorry.

I'm tired, sorry. Also I'm not the most knowledgable person on here I'm sure and some stuff could be wrong and if it is please chime in and correct me, thanks. Don't rush, get everything together...

[Flashmn]

First of all, you need to buy this book: Corky Bells Maximum boost, you need to learn the basics of the whole turbocharging.

Obviously there has been success elsewhere with carbs/turbo, some factory cars came with carb/turbo also...

Yeah, obviously there has been, but why would you insist on using something from stone age in a car, when you could use something you can get adjusted and running properly. Carbs are always going to be a compromise. And yes, carbs are a pain in the ass compared to EFI when it comes to boosted cars.

Heres very briefly how you turbocharge your car with a stock carb:
-build a pressure box over the carb, that totally encases it onto it and run the boost pipe to the box. Done.
-Install an EFI in line pump/in tank pump and use a carb fuel pressure regulator with boost reference, adjust it to 6psi base pressure.
-Drive on street to see how the mixtures are from a innovate LC-1

[canadianae92]

I'm neither insisting on using carbs or advocating the use of carbs, with turbo... By the way.

I will check out that book flashmn... also I would really appreciate any advice you have for someone who is about to tackle turbo charging for the first time! Any other good reading material on the subject? etc...

I don't mean to thread jack or anything but the information should be helpful to OP as well.