Yep I think you guys are right, both rallycar and myself have had bad runs with webers, which probably give us a really bad outlook... whenever someone says weber to me, I just think $$$$.

And just as a side note, I thaught u wanted to get your car running as lean as possible without detonation.... If this is the case why should webers use more fuel?

I tend to notice if your higher in the rev range, including track work you almost get better economy than city driving.

you normally fatten up the mixtures to about 12.5:1 at WOT

Quote:
I got 260km out of a tank (I think they're about 35l) in last year's QLD Challenge road rally including a number of special stages. But at sprint meetings last year where we were dual entering the car we went through more than 20L per day for under 50km of full noise running

hmm, maybe that was 20L for the weekend...

hmmm, 20L is 12 laps of Manfield for me....

Having been in both camps, I can say that carbs are great, like anything, it's what you're comfortable and familiar with. It took me a whole season to learn enough about EFI to make it as good as the carbs were.
There is no difference in absolute power between a well sorted carbie setup, and throttle bodies.

Now, on any decent competition engine you arent going to be able to use a vacuum signal to tell your ECU what's going on, so you have to do it with throttle position. This means that carbs actually have an advantage, in that they're self tuning, eg, if there's less atmospheric pressure around, the carb just naturally see's less vacuum across the venturi, therefore less fuel goes in.
The throttle position sensor knows nothing of this!

I did get major gains in driveability going from 50pph's to throttle bodies. It is a bit of a nutcase engine though... I also got good gains in horsepower by playing with the spark curve, which wasnt possible with a dizzy, however this isn't a carburetor limitation..!

I'm interested in why you cant use MAP sensor to work out the air pressure on a competition engine.

I'm not disagreeing the fact I would just like to understand why.

BTW I'm learning a fair bit from this topic.

Oh and the main reason I'm going EFI is because I picked up the TB's cheap and am goign to use megasquirt... hopefully learning more about EFI and how it works.

With a big cam & quad TBs the vacuum signal is unstable as, causing the ECU to fuel all over the place - most Quad setups work on TPS mapping which is, as stated above, not that crash hot in certian circumstances

at WOT where it matters there is very little if any difference in performance.....There are 2 4age powered starlets that race here one with efi the other with 50mm webers, and they are any differences between the two if anything the starlet with the carbs are quicker...

by the way....Injection is actually older than Carbs.