go to carbs or stick with efi ?

[993phill]

putting together my project car old tuscan challenge car
and i am trying to decide wheather to stick with the efi or to fitt a four barrel carb ie webber / holly
both have there advantages
carb will look a neater instilation in this car and i will not have to keep visiting rolling roads with the laptop every time i do an upgrade and will probably be cheaper in the long run
efi i have all the standard parts done and ready to fit
any advice would be helpfull
many thanks

[tvrolet]

Holley 750 double pumper does it for me

But judging from what you see when you look down the barrels when you open the throttle, I guess a watering can would have much the same effect.

Price no object I'd love 8 throttle bodies and FI, but the big Holley seems to do just fine.

[antonyj]

Personally ,I would stick with FI.
The megasquirt ecu looks good for its cost, and I like the look of the emerald.
I know the carbs give some good power gains, but in theory they can still go out of tune.

Surely its would make sense to be able to use a laptop and view o2 readings and the like.

Isnt there a local specialist who can help you with tuning and setup??

[apache]

Heck of a lot less to go wrong with a carb set up

[Jasper Gilder]

Holley eh? What became of a few downdraft Webers - I've got 3 on my 3000M - You'd need some larger ones for a AJP, and a fancy manifold

[eliot]

993phill said:

i will not have to keep visiting rolling roads with the laptop every time i do an upgrade

What makes you think that you wont need to visit the RR after each upgrade when running carbs?
Fuel Injection all the way i'm afraid.

[993phill]

cost is also an issue and to modify the efi system seems very expensive and complicated
with assorted airflow meters different ecu chips and flow rates etc etc etc
webber 500 carb better cam and maybe a bit of gas flowing to the heads may get the results for a lot less
i think

[993phill]

sorry forgot to say on rover v8 not ajp

[trackcar]

injectin all the way for me too, but on a proper ecu with mapped ignition : better manners, smooth power delivery, better fuel consumption (yes it's important even on a race car, less fuel carried = faster car), mapped ignition for max power gains, it's a no-brainer for me, still can't understand why people outside of historic series run carbs ..

[Graham]

after running a car with fully mapable fuel and sparks on the rollers a few times and seeing the huge gains you can get by tweeking a few things there is no way i'd go back to carbs.. you can tweek much easier than with carbs, and you can change things in different parts of the range that you cant do on carbs.

yes i did convert the tasmin back to a carb but that was replacing an agricultural expensive to maintain mechanical FI.


the standard rover/tvr stuff is more difficult to tune as the dissy is mechanical and the ecu needs chips. swap that out for an emerald and your well away.

you can run it with a locked distributor or go to crank sensor and coil packs.

with the latest one you can swap between 3 maps on the fly and with a wideband lamba it will adaptive map.

it will also data log, so do a few changes, run down the road. look at the data a few more tweeks

G