how to tune a 4af carb - Toyota Nation Forum : Toyota Car and Truck Forums

freakinbox · 02-13-2006, 04:23 PM

title says it all, I messed around with it and got lucky that it's running smoother but I'll be honest, I know fuck all about that little carb lol

Flashmn · 02-13-2006, 05:28 PM

Throw that POS away and get yourself a weber or two

freakinbox · 02-13-2006, 08:44 PM

ugh I hate when I ask questions like this and someone has to be a smartass, first of all I have NO money. Went back to school and I am broke. I messed around with the carb the other night and it seems to be running better but I want to do it properly. Besides right now I need to limit the power that enginehas because if it had more I would use it, and I don't need to go faster right now

Flashmn · 02-14-2006, 02:13 AM

Well I wasnt trying to sound like a smartass, but the AISIN carb is REALLY limiting, adjusting the mixtures screw only applies to idle. So you cant really limit high rpm unless you change the jettings.

gasman · 02-14-2006, 04:01 AM

hey flashmn i was thinking of getting a set of oer racing carbs (japanese copies of webber) 40mm, but not too sure on the inlet manifold and how hard it would be to install them. got any advice on it?

Flashmn · 02-14-2006, 06:13 AM

Can you get jets and parts for the carbs?
Thats a big issue, if theres no support for the carbs leave them and get some webers from redline.

freakinbox · 02-14-2006, 07:14 AM

I couldn't find the air fuel mixture ratio screws lol

***REN69*** · 02-14-2006, 07:16 AM

Could be worse dude.. you could have 4AC super powa!

Flashmn · 02-14-2006, 11:11 AM

So if you didnt find the fuel mixture screw then what did you adjust?

freakinbox · 02-14-2006, 01:41 PM

not a clue lol, thay long screw with the nob, adjusts the idle and another screw that was on an arm of some sort lol

Flashmn · 02-14-2006, 02:12 PM

The long screw with the knob adjusts the idle speed.
The screw on the arm sounds like the dash-pot, which keeps the gas up for few seconds so that the engine wont stall on throttle shut-off.

So in essence, you didnt really adjust the carb at all.

freakinbox · 02-14-2006, 03:04 PM

lol if it's on the carb and you adjust it, it's adjusting the carb

Flashmn · 02-14-2006, 04:07 PM

gasman · 02-14-2006, 08:00 PM

Quote:

Originally Posted by Flashmn

Can you get jets and parts for the carbs?
Thats a big issue, if theres no support for the carbs leave them and get some webers from redline.

from what i hear the jets and parts are interchangable with webber ones. how about the manifold and instillation ? how hard was it for you to install?

freakinbox · 02-14-2006, 08:29 PM

how do you install an aftermarket carb? thought they didn't use the stock vacume lines? which leaves me not knowing what to do with any of those lines