Carby Question??

[ae95- wagon kid]

I don't think anybody has done this before but here goes.

 

i have a 4afe head that is getting ported etc

 

and a nice 272 degree cam is going in

 

my mate has alot of weber and dellorto carbs

 

i was thinking twin dellorto 40's

 

i can get a manifold from south africa for around the 100-120 mark

 

i have measured and it will fit in the bay ...... but will be tight

 

i can tune the carbs and upkeep on them is the easy part

 

what would i also need to get this to work as i understand that the computer probably controls

 

i can buy welsh plugs easy that will fit

 

any suggestions sorry for rambling on fellas

[Hiro Protagonist]

I don't think anybody has done this before but here goes.

 

i have a 4afe head that is getting ported etc

 

and a nice 272 degree cam is going in

 

my mate has alot of weber and dellorto carbs

 

i was thinking twin dellorto 40's

 

i can get a manifold from south africa for around the 100-120 mark

 

i have measured and it will fit in the bay ...... but will be tight

 

i can tune the carbs and upkeep on them is the easy part

 

what would i also need to get this to work as i understand that the computer probably controls

 

i can buy welsh plugs easy that will fit

 

any suggestions sorry for rambling on fellas

 

As usual, why would you? Despite what many people try to argue, tuning twin carbies and keeping them in tune will never be as easy, reliable or powerful as a proper EFI setup, especially for a more modern engine like the 4AFE which already has EFI in the first place. By the time you figure in the cost of the carbies, the adaptor manifold, tuning, something to control ignition and the like, you might as well have just spent the money on a decent piggyback computer and a couple of hours tuning on the dyno and be done with it.

[Des]

4AFC carby would work to solve ignition problems.

[altezzaclub]

One problem would be the computer's reaction to a rich or lean reading from the oxy sensor in the exhaust.

 

Would it alter ignition in compensation? Would it run at all without an oxy sensor? (which you should hook up to a mixture display for jetting the carb too)

 

Is there a feedback from injectors that the computer would be looking for, or does it just send a millisecond timed signal down the wire and then ignore it?

 

We've just done Victoria & back, 2000km at 120kph in the Altezza, and the 2L 3SG-E turned in 7.5L/100km. That's as good as the 1300cc 4K does in the KE70 on the same sort of trip at 100kph! As Hiro says, why bother?