3.5 v8 engine efi or carbs

jimjames2uk · Nov 15, 2016

have a v8 3.5 efi in my defender at momnet and have a spare engine i'm rebuilding. Would it be better to stick with the efi or rebuild it with carbs and which would be better su's or stromberg thanks

cooltide · Nov 15, 2016

Efi. Strombergs and su are both underwhelming (well they are on a low comp v8) Also your fuel pump pressure is too high for carbs.

jimjames2uk · Nov 15, 2016

thanks just thought id ask the question

J6BXR · Dec 17, 2016

RobV8Defender · Dec 18, 2016

Hi, I have just had a Weber carb fitted to mine - I am totally happy with it.

Probably, almost certainly, you will get better performance from EFI - but for reliability and simplicity - the carbs are great.

I'm in Somerset if you want a go to find out.

J6BXR · Dec 18, 2016

Hi I had weber on my last one and agree, it installed a bit of confidence when going on a long trip..........you can fix it if it goes wrong and it will run on lower grade fuel.......I do like the efi on my disco.

Thanks for the offer .......in Glasgow though

J6BXR · Dec 18, 2016

Rob what sort of fuel consumption do you get on a run?

jamesmartin · Dec 18, 2016

jimjames2uk said:
have a v8 3.5 efi in my defender at momnet and have a spare engine i'm rebuilding. Would it be better to stick with the efi or rebuild it with carbs and which would be better su's or stromberg thanks

efi is the better option

norseman · Dec 19, 2016

I've had four EFI RR V8's (I hotwire followed by 3 flappers) without any problems but agree that for pure simplicity it's carbs, preferably SU's I would say.

J6BXR · Dec 19, 2016

I swore by SU's until I used a weber 500 so much simpler to use than Holley , problem now is cost of weber and manifold . SU's still good excellent set up....Like my efi though

RobV8Defender · Dec 24, 2016

Hi, sorry for slow reply - as far as economy goes - I just don't know - but I think it is around 15 mpg..

I tend to just lie about it - saves a lot of conversations....

RobV8Defender · Jan 4, 2017

For the good of the order, I measured fuel in vs mileage - 35L gets 120 miles.

RobV8Defender · Jan 4, 2017

For completeness, this is a V8, 3.9 with Edelbrock carb going through a ZF Auto Gearbox

3.5 v8 engine efi or carbs

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