Just would like to know how hard it is to convert an injected 5litre efi to carby engine and whether anyone can help thank you.

I would assume you just buy a manifold to replace the EFI one, then just bolt a carby on. But why?

Carbys cost less to setup for big hp, they look better in older cars.

I think there is a Harrop manifold that doesnt need a bonnet scoop like the Active one.

manifold swap, harrop and torque power make manifolds that would suit a carby.. then youll need to disconnect the efi stuff... not cheap to do and at the end of the day it'll drive ****ter than the efi setup and be illegal. so WHY!?!?!? efi has been put on every car since 1990 for a good reason, if u cant get power from it then u dunno what you're doing.

is that all i have to change, or does anybody know who to talk to about it thanx i was just curious thats all

You'll need to be able to shift your gearbox using something other than a computer if it currently does so. Sinister - stock manifold and throttle body are restrictive on the 304. By swapping to carby you can get more power without paying for twin throttle bodies etc. Plus carbies sound better, and suit older cars. Swapping to say, a COME manifold would cost about $3500 all up. Swapping to a TP manifold and Holly would cost about $1500 all up. Now the first is a lot better than the second, but the second is better than stock.

you will have to change the dissy to as the efi ones are differant to usual electronic ones..... other than that its fairly simple you will need to get another fuel pump as carbys run way less fuel preasure than efi ones...if you car has a vn-vr turbo 700 you wil not need a computer to run the box as i think vs onwards is a computersied box... as for the come manifolds they are **** compared to the flowcraft ones and ae the are the same price... however the carby will always make more power as the fuel speed is much greater, as it get pumped from much higher up in the manifold unike at the bottom of the runners with fuel injected cars....

ppl focus too much on kilowatts.. a manifold swap might make more kilowatts but it would definately be down on torque, nothing beats the bananas on torque, and if u daily drive the car then u want torque especially in the lower rev ranges, the kind of power where u just need 2cm of throttle driving in traffic.. a carby converted efi car is stupid, its illegal, will get heaps worse economy, lot of stuffing around and will kill your resale value too.. As for sound ha... ive never heard a 308 that sounded better than my statesman, its all in the exhaust... course a cammed up 308 will sound tougher but keep it apples to apples

I think Street Machine would find this fascinating....What I have read over the years is completely different to what is being said in this thread. A carbie set is better then EFI? You get more power from old school carbie set up? Been a long time since Top Fuel, Top Alcohol, Top Doorslammer ect ect have used carbie/s. Even Pro Comp are running forms of EFI now. The bottom line is EFI is better then carbies, its that simple. Save ya money and buy a better EFI set up, better then going backwards.

Quote: Originally Posted by VLT_RB30 I think Street Machine would find this fascinating....What I have read over the years is completely different to what is being said in this thread. A carbie set is better then EFI? You get more power from old school carbie set up? Been a long time since Top Fuel, Top Alcohol, Top Doorslammer ect ect have used carbie/s. Even Pro Comp are running forms of EFI now. The bottom line is EFI is better then carbies, its that simple. Save ya money and buy a better EFI set up, better then going backwards. here here.

I'm thinking of doing the same thing, using an efi engine and converting to carby setup and stroked to 355, vn type heads ect. I'm planning something to make minimum 300rwhp. What im curious about is what would be the best base engine to start with and rebuild. These are the options i'm considering. 1-just a regular carby 308-304 from a vk-vl, very cheap 2-efi 5L from vn-vs, bit more expensive 3-vt block,now these are still expensive and much harder to come by, but are all ready clearanced for a stroker crank, would i be better off paying more for one of these engines? keep in mind which ever i engine i decide to use, i will be having it rebuilt, stroked and will NOT be using efi. I've kinda already ruled out using a vt block as i dont want to spend to much on the initial purchase of an engine but i'd just like to know what do other people think then?

It all depends what you're wanting to achieve. Older car - Convert it back to carb!! Big carb, big cam, big manifold and itll hammer. Itll cost alot more to do this with EFI. Carbs suit older cars, theyre easy to tune and they work very simplistically. Youll need to change distributor, manifold, carb, (auto will be fine if its VN, VP or VQ. VR onwards is hopeless, keep the EFI). I was 90% of the way through this conversion and think it's a top one!

so thats all i have to do to convert efi to carb distibutor,manifold and carby yea its just ive already got the efi motoor it was out of a vs maloo ute and cant be bothered selling it and would really like to put it my vh as carby also got a price on harrop single plane high rise manifold or duel plane $880.00 and also a proform 750 carby for $800 from flowcraft just need to know wat type of distributor i need. im guessing one off a carby 308 because they have vacuum advance im not sure just a guess

my mates got a a 304 with a carb just changed it over from injection he never touched the dizzy ???? why do u have to change it guys ???

i fink some people dont know much about the EFI side of things with engines so they tend to wanna just stick with carbie in a way i understand this as with an EFI car everything u change and upgarde you need to tune the ECU where as a carbie car is alot better you change somthin u can basically do it in your own back yard tuning and all that. but yer i have heard of people converting from carbie to EFI and back. i have seen plaent of rotaries and 4AGE engines running webbers and makin pretty good power.

If i had an injected motor to begin with, i would never have used a carby. Only reason why i have used one is because i couldnt afford buying all the ****. As far as tuning goes, tuning an EFI car is alot easier than carbs. There is no need to change jetting, fuel going everywhere etc, all you do is sit in the car with a laptop. Not only that, EFI keeps its tune, even on the coldest days, it will start first go. Not like carbs when the piece of **** won't idle correctly when cold. And because of the greater range of tuneability with EFI, not only does fuel economy get better, but you can get better midrange torque as well. With carbs, they are tuned for either economy or power, it's very hard to get the in between.

Quote: Originally Posted by NIX-3LT my mates got a a 304 with a carb just changed it over from injection he never touched the dizzy ???? why do u have to change it guys ??? does he have any dromams with it mate and if it just a case of changing manifold and carby can you use a manifold and carby off a 253 engine?

The factory distributor is controlled by the computer. I cant see how it can work on a carby engine.

i dont know guys but i asked him what ignition he is running the other day he said the stock stuff that was already on the car ?? who knows thanx for the input ELA-RE just going on what he said ???