EFI to carb conversion?

Pedey · Post by **Pedey** » Mon Mar 19, 2012 10:28 am

Hi guys,

As I said in my intro post, I'm new to Zeds so any help would be appreciated. One of the many areas of my S30 280Z that needs attention is the motor. The L28E is currently running the Bosch Jetronic fuel injection system, which, from what I can tell, is pretty horrible. I think it needs to go, and I'd like to go to a carb set up.

From my understanding, I'll need carbs, filters, manifold, fuel pump and other bits and pieces. Is there anyone out there with experience in doing this? What is the easiest and cheapest way to go about it here in NZ?

Thanks in advance, Pedey

Andy · Post by **Andy** » Mon Mar 19, 2012 1:59 pm

We have used Hitech in Drury in the past, Bob Homeward can supply and tune Weber sidedraughts and Redline manifolds.
Best to use an airbox and remote filters in my opinion rather than filters in the engine bay, as the temperatures above the exhaust are very high, carbs must be seperated by a shield from the exhaust headers and using coated headers is recommended to keep engine bay temperatures down. Carb manifold should be longer if possible the stubby bent ones do not flow as well. If you're planning any headwork or a cam of course get that done before Bob starts work. Fuel pump recommendation, I have none for a road car, I run a Carter, its reliable but noisy as.

us2 · Post by **us2** » Mon Mar 19, 2012 4:17 pm

The easiest and cheapest way,--- for a street car.

Drop on a set of manifolds and SUs from a 240Z. They can go quite well on a 280. Set and forget.

Pedey · Post by **Pedey** » Mon Mar 19, 2012 5:44 pm

That would work for me, the problem would be finding a set, surely?

Andy · Post by **Andy** » Mon Mar 19, 2012 5:51 pm

Pedey wrote:That would work for me, the problem would be finding a set, surely?

They are around, many have them gathering dust as the body may have rotted away but the carbs survived also many triple carb conversions have left behind a set of SU's. The "round top" versions seem to be preferred.

us2 · Post by **us2** » Mon Mar 19, 2012 7:22 pm

I know of a set if you are serious.
They are the preferred 'round top''SUs. Left over from a triple conversion. They are in good condition, but not sure if they would be for sale.

nzeder · Post by **nzeder** » Mon Mar 19, 2012 8:32 pm

Not sure but I might have set of 240z SU's can't remember now. But I know of another set too and I am sure they could be sold. I will find out for you.

Cheers
Mike

Pedey · Post by **Pedey** » Mon Mar 19, 2012 9:43 pm

Thanks Mike

rusty260z · Post by **rusty260z** » Mon Mar 19, 2012 10:00 pm

if your not keeping the fuel injection
i'd be keen to take it for spares
do advise when you have made conversion,
and how much, ta.

Pedey · Post by **Pedey** » Mon Apr 02, 2012 8:35 am

These came off a Japanese L20, does anyone know if they would be of any use to me and secondly if the price is reasonable considering they need a rebuild etc? Thanks!

http://www.trademe.co.nz/Browse/Listing ... =462580518

mike260z · Post by **mike260z** » Mon Apr 02, 2012 8:50 am

A carby L20? Must be off a JDM Fairlady. If you want some decent power from that L28 you should look into some Webbers or Mikunis.

Andy · Post by **Andy** » Mon Apr 02, 2012 9:08 am

Pedey wrote:These came off a Japanese L20, does anyone know if they would be of any use to me and secondly if the price is reasonable considering they need a rebuild etc? Thanks!

http://www.trademe.co.nz/Browse/Listing ... =462580518

They are flat tops and some say not the most tuneable type, $200 is a good price but wait for some round tops.

us2 · Post by **us2** » Mon Apr 02, 2012 9:14 am

Agreed. The reason they are cheap is because they are not so desirable.

ZMAD · Post by **ZMAD** » Mon Apr 02, 2012 9:53 am

I sold 2 sets of flat tops for about $2 on a dollar auction ages ago. Not very desired alright.

ZMAD · Post by **ZMAD** » Mon Apr 02, 2012 9:55 am

The panels for sale by that trader are interesting and here in Tauranga too.