carburated or fuel injected? - Toyota Nation Forum : Toyota Car and Truck Forums

soulibrium · 05-28-2003, 10:24 PM

there is a starlet that someone was trying to tell to me, with a 4age swap with a side draft. now i dont understand why someone whould take out the fuel injectors with a carburator as a replacment?? is there a reason behind this? more power? better response? or is someone trying to be a baddas$ and wanna be different !? arnt carburators leff effecient then fuel injectors? can someone help me?

also, i see that lots of pepo change their fans from pump to electric. why? whats the reason for this ? does this improve performnace cause its not attached to the motor? less stress on engine? is that it? or is it just another one of these cool things that someone can do to make him/herself more unique??

im totally stumped !!

boroEF · 05-28-2003, 11:44 PM

with carbs u are able to run crazy cams without having to change a computer or get a stand alone for mad $$$$$

also it's much faster throttle response with carbs, sounds sweet and can flow a much higher volume of air into the combustion chamber when compared to the traditional intake manifold+tb setup

Flashmn · 05-28-2003, 11:50 PM

Well response is alot better with carbs and yeah you can run long duration cams alot better with carbs than efi.

Quote:

sounds sweet and can flow a much higher volume of air into the combustion chamber when compared to the traditional intake manifold+tb setup

Well it wont flow any more air into the combustion chamber, because we're dealing with a naturally aspirated car. Its just not possible, the vacuum of the piston going down will suck in a fixed amount of air regardless if its carbed of efi.

boroEF · 05-28-2003, 11:51 PM

and carbs sound sick!

i say why not

much cheaper than a stand alone...looks kool, sounds sick...why not

Flashmn · 05-28-2003, 11:54 PM

Hehehe, I'll be having soem twin sidedrafts on my AE92 as soon as I find a working pair of weber 40mm's or keihin FCR's

Deep · 05-29-2003, 11:30 AM

This was covered way back. The consensus was that for hardcore all out racing apps carbs win over f/i due to tunability. But for daily driving carbs require too much maintenence to keep them running perfectly. Ie, elevation and/or temp changes require rejettting, whereas f/i adjusts for those variables on its own.

Flashmn · 05-29-2003, 01:11 PM

Its a bigger hassle for me to go EFi than twin sides ;P

top-speed · 05-29-2003, 03:22 PM

just outta curiosty how mnuch was it

rezzle · 05-29-2003, 04:48 PM

I use an Impco 425 mixer with an Impco E type regulator.

goodcookiedrift · 05-29-2003, 08:33 PM

carbs and itb's DO pull in a lot more air than traditional TB's.

they totally increase your volumetric efficency. because its dedicated to each cylinder as oppose to air flowing thru 1 TB then dived by runners. Velocity is lost.

Carb's are infamous for sucking in vacum lines or whatever sits near the air horns!

nick

rezzle · 05-30-2003, 09:13 AM

Quote:

Originally posted by soulibrium
there is a starlet that someone was trying to tell to me, with a 4age swap with a side draft. now i dont understand why someone whould take out the fuel injectors with a carburator as a replacment?? is there a reason behind this? more power? better response? or is someone trying to be a baddas$ and wanna be different !? arnt carburators leff effecient then fuel injectors? can someone help me?

also, i see that lots of pepo change their fans from pump to electric. why? whats the reason for this ? does this improve performnace cause its not attached to the motor? less stress on engine? is that it? or is it just another one of these cool things that someone can do to make him/herself more unique??

im totally stumped !!

Carbs are way easier to setup unless you have a programmable ECU and it can be a bitch restringing all that wire.

Electric fans are better. There is a weight gain - with the addition of the electric motor but there is a significant HP gain about 5HP-15HP depending one the fan, even on cars with 'clutch' type cooling fans. The problem with pulley fans is that they are designed to move enough air at idle to provide cooling. Fan laws dictate HP1=HP2(rpm1/rpm2)^3 so you can see that the HP lost to the fan at higher RPM vs the lower RPM is equal to the CUBE of the speed ratio. In Canada it is also nice to not have the fan spinning on cold winter mornings because the car gets up to operating temperature faster.