Turbocharging help/input (4a-c [carbed])

[O 16581 72452 5]

My license is soon to be suspended and my insurance dropped (which i'm not proud of) so i'll have alot of time to be at home and will need a project. I'm wanting to turbocharge my SR5, but i'm pretty new to carboretors, i'm going to be running roughly 6psi on stock internals, what CFM carbureator and type should i be looking at for this engine and my needs?

I will further study this on my own, but i need a base to start with.

[|PuNiSh3R|]

Don't waste your time.. I know it isn't the answer you would want to hear, as I've wasted a lot of time/money on my 4AF. But it is a waste. First off you will fucking KILL yourself with all of the tuning issues you will run into with having a TC'd carburetor.. it is NOT worth it. Ok, so today.. it is 60f out.. sunny with the sun beating down.. nice and warm.. beautiful day. Car runs really nice.. perfect mixture. Oh well since it is the end of winter/beginning of spring, Come this evening the temps will be dropping down to 30-40F .. boy, from 60F to 30F.. that is a big change.. You will be constantly having to tune the fuel mixtures on the carb.. and to top it off it isn't just like, ok turn this screw n that screw n i'm done... nope.. It's more like, remove any intake tract that's in the way.. remove whatever u need to remove on the carb to get to the jets.. put in a diff set of jets.. etc etc.. PAIN IN THE ASS. GO with EFI.. u'll get a LOT better fuel economy a LOT easier tuneability PLUS a lore more tuning power.. If you invested in a programmable ECU you could tune the system using a laptop.. in 5 minutes change whatever settings u want with out even popping the hood.
I've been through everything with carbs man it is expensive, tiring.. annoying.. trying to cold start your car during the winter will be a bitch.. ugh I've had ENOUGH of carbs, this is why they invented EFI. Only time I'd prefer a carb setup over EFI would be during a continual VERY HIGH rev race.. and even for that they are developing much more robust EFI systems that can handle high rpm duty cycling.

[Flashmn]

I see punisher has a change of heart
I dont see any problems running a turbocharger with a carb. Theres few ways to do it, do some research. Oh and about the ambient temp thing, dont worry, because with a turbo you'd basically be running the same ambient condition into the carb all the time, because you're artificially producing pressure. Normally you'd have to change the jettings, because the carb takes effect on ambient conditions.

[O 16581 72452 5]

This is more of a budget turbo project, meaning, i won't be converting to EFI as i won't have the funds. I already have the turbo laying around as well as a by-pass valve, i'm now looking for a carburetor that will suit the needs of a turbo.

Can someone explain to me a "blow through" and a "draw through"? Most people running turbos that i've seen are running "blow through".

Lastly, where would i tap for the oil line?

[Flashmn]

Oil line would be tapped of the block.
With a blow through you could basically use the stock carb (just make sure you dont put alot of boost and the jetting is ok). But you'd have to make a box around the carb and run a tube from the turbo intake-outlet side to the box to equilize the pressure inside the box and outside the box. That way your carb wont leak out fuel from every hole, because it wasnt exactly designed for turbo use.

[|PuNiSh3R|]

It is more trouble than it's worth. You will run into jetting issues. You will have to put in larger jets and no way in hell would it perform on the stock carb. Building the box won't be easy either.

[O 16581 72452 5]

Originally posted by |PuNiSh3R|
It is more trouble than it's worth. You will run into jetting issues. You will have to put in larger jets and no way in hell would it perform on the stock carb. Building the box won't be easy either.

I can get ahold of a guy to build me a box to suit my needs, once i get the Corolla specific tuning needs, i will go to him for the general needs.

Where would i tap the block for oil?

[Tercel GTS]

running throttle linkage into the box without a bad air leak will be fun too...
For the price of the custom fabrication you'll need will prolly cost near what a swap can be done for. Consider this, I was told it'd cost me $5000 - $8000 to put a 3SGTE in a Tercel. With this figure in mind I set out to prove people wrong. I borowed $2000 and purchased a 91MR2turbo locally that had already started the parting process. I found a forum for MR2's and started selling parts that I wouldn't need. After taking out for the shipping charges I've collected $1200 and applied that towrds paying of the loan. My boss found a Tercel at a goodwill auction, $122 total price. Bad 3E and nice body. Perfect! My dad did the custom cutting/welding on the frame to clear the tranny without loosing any strength, as if there was any strength to start with... $277 for a camry tranny to get FWD parts from and if the MR2 cv joints will flex far enough I'll modify the shafts myself.
So far I have a little over $1000.00usd in my project and I'm looking at welding in the mounts this weekend weather permitting. I still have a few parts to get yes, some will be expensive. And I also still have a few MR2 parts to sell.
Your budget can be greatly enhanced by your resourcefulness.

[O 16581 72452 5]

I really don't see turbocharging this engine going over $500 (i already have the turbo), i'm running it without an intercooler, i'll be using radiator hoses from a junkyard for the piping and a carb box from someone who has been professionally making them since the 70s.

I've access to a welder also.

[|PuNiSh3R|]

The more we tell you to not waste your time the more it'll push you to do it, and coming from me.. a man who has wasted more time/money on my carb'd 4AF I can tell you straight out that it is going to be so much trouble trying to tune a stock carb on a Toyota, a carb that isn't made to be tuned in the first place, is going to make you go fucking crazy. But have fun.

Remove your oil sensor switch on the block, install a brass T in there.. or whatever you wanna do.. it should be an 1/8" NPT thread. There is your oil. Remember after taking your sporting new turbo stock carb'd car for a run that you let it sit to cool down before you turn it off or all hell will break loose on your turbo, engine and oil. Remember that the stock carb isn't going to know how to control the boost either, I doubt it.. It won't be able to supply enough fuel when needed so you will be running lean.. You will end up blowing the motor because of it. To top that off the stock carb will be a huge restriction in power because of the small throttle plates..

[O 16581 72452 5]

Originally posted by |PuNiSh3R|
The more we tell you to not waste your time the more it'll push you to do it, and coming from me.. a man who has wasted more time/money on my carb'd 4AF I can tell you straight out that it is going to be so much trouble trying to tune a stock carb on a Toyota, a carb that isn't made to be tuned in the first place, is going to make you go fucking crazy. But have fun.

Remove your oil sensor switch on the block, install a brass T in there.. or whatever you wanna do.. it should be an 1/8" NPT thread. There is your oil. Remember after taking your sporting new turbo stock carb'd car for a run that you let it sit to cool down before you turn it off or all hell will break loose on your turbo, engine and oil. Remember that the stock carb isn't going to know how to control the boost either, I doubt it.. It won't be able to supply enough fuel when needed so you will be running lean.. You will end up blowing the motor because of it. To top that off the stock carb will be a huge restriction in power because of the small throttle plates..

Where's the switch located?

I realize it won't be a huge difference, but i'm sick of having to floor my car just to keep up with traffic.

[Flashmn]

Remember that the stock carb isn't going to know how to control the boost either, I doubt it.. It won't be able to supply enough fuel when needed so you will be running lean.. You will end up blowing the motor because of it. To top that off the stock carb will be a huge restriction in power because of the small throttle plates..

We have lots of cars running turbos with carbs over here in finland, yes some run with stock carbs. Well efi wont know how to control the boost either, you'll need a separate controller for that.

[|PuNiSh3R|]

But you won't have the tuning nightmares that you will with a carb..

Now, it's really stupid to do this just so u can keep up with traffic.. You would be much smarter to just do an engine swap.. that engine is seriously worthless.. specially since it is only a single cam 8valve engine.. Sorry to say it bro.. but you could get a nice used engine for 500 along with the wiring harness and ECU.. I got my 7AFE with everything for 500USD and only 79K on the engine.. it's in excellent condition.
I loved carbs.. and I hated EFI.. I would never switch over to EFI basically because of the problems we seemed to be having with our Fords.. It just seemed like EFI was such a horrible thing.. with its computer and shit I just didn't want to trust everything to a computer. But what I've come to realize is that carbs can be a fricken nightmare if you try to tune them or upgrade them or whatever have you.. The continual changes with the jets for different temperatures.. It's murder. Yesterday here it was literally 55F and sunny, georgeus day... Today it is snowing 5-7" and currently is 29F.. Took my car some time even after the coolant got hot to stay running.. I'd come to a stop n would have to put it into neutral n rev it or else it would drop down n stall out.. That plus with EFI you can literally tune and change fuel mixtures with a laptop in no time.. if you have a programmable ECU (a good 1G for one tho) but you could get an S-AFC which would do the job just as well for 70-300 bux.

I know you will install that turbo and you are going to have hell with driving problems.. all kinds of tuning issues and idling issues, but it is your money. I've beat around the bush a few times with carbs and wasted a LOT of money on them.. just on a few jets alone I've spent a good 60 dollars.. Real carb people have a box filled with jets for different weather conditions.
I've just grown up and came to the conclusion in my mind, EFI = driveability in all conditions, almost worry free depending on your customization.. Carbs = Time, money, trouble horrible horrible gas mileage if they aren't tuned in specificly.. one day you might get excellent mileage the next you might get shit depending on the temps.. could have the carb set to run at 60F and then the next day it is cold more like 40 or the night time be like 30F and you will be running lean then.. or if it's cold one day like it is here and then warm the next you will be running rich.. blah blah blah bullshit.. exactly why EFI was invented and carbs were put on the shelf's and left for racing and some sports bikes where people usually only ride on warm days.. Fuck, even motorcycles are finding EFI systems on them now.

[Flashmn]

Hell I wonder whats wrong with your carbs, I ran my carbs in +30C and in -30C and hell I didnt have any problems what so ever, no adjustments needed.

[O 16581 72452 5]

It's not only for drivability issues, i was simply giving an example of how slow it was. I have problems passing cars on highways, problems entering the interstate, etc. I really want to make the car more fun. Turbocharging seems to be my best route as i already have the turbo, i need to do something with it insted of letting it sit and be in my way.