davidfox280585

so who is runnung these injectors on a yb or zetec?
what power are you at and any pros and cons with these?

rog

iTrader: (2)

As above, exactly what injector is it? I run the 83lbs siemens ones, they are no longer available though. Direct fit into a coossie fuel rail, no messing about, seems that most people can map them or have experience mapping them.

rog

iTrader: (2)

Nice to hear as genuine ones are thin on the ground, as I'm sure you know.

davidfox280585

I've purchased some as I was unaware of anybody distributing from here, the ones I have bought are here and do state 80lb versions
http://www.ebay.co.uk/itm/221167070856
They will be going in my zetec turbo and currently on a t34.63 though I will be upgrading to a gt30

After liking about seemed the 630cc ones would be that bit small unless we could crank the fuel pressure up

Many thanks for the replies

davidfox280585

Having a scout about the cosworths run low impedence which seems that is mainly what the 83lb versions are and the 80lbs are high impedence, I'm currently using Dta s40 ecu which uses the high impedence injectors,

So no real bad reports then which is good
Many thanks for the replies guys

cossynut2

I have just had a look on e-bay and was about to say they are high impedence injectors which will not run on a Yb engine but your reply beat me to it As you are using a modern ecu on a zetec engine you wont have any problem apart from a suitable chip. You will probably have to have the engine live mapped and a custom chip as I doubt if there will be an off the shelf one available.

xr2wishy

iTrader: (2)

i ran 630cc siemens deka IV's on my zetec turbo, fully forged engine, cammed, ported and running a gt3071r 0.63 housing. ran 2BAR and didn't lean out at all on full chat.
they do respond well to raised pressure to act upto 900cc, the problem is getting a fuel pump to provide 6BAR plus boost to supply enough fuel.
if you can get hold of an 813 type 044 bosch fuel pump this is not a problem as they will run at 8BAR constantly instead of the low spec ones

QplateRST!

I run the 875cc siemens deka on my zetec turbo they are running at 60% duty at 3.5 bar base pressure doing 425hp

Stu @ M Developments

iTrader: (12)

We still have plenty left too.
http://shop.motorsport-developments....ance-234-p.asp

stevieturbo

Not sure how happy they will be with the batch fire of the DTA S40. Effectively they'll be equivalent to running 1600cc's as they always fire twice per cycle.

davidfox280585

Thanks for all the input guys and I will mention this to my tuner but he is a dra dealer and advised me on these as the std focus rs ones aren't playing ball after 17psi

Many thanks

davidfox280585

Many thanks for the reply, what ecu are you using? Hopefully they should be here shortly and I can get them fitted and get the car back in the rollers to be mapped again

xr2wishy

iTrader: (2)

that's not how they work, the listed flow is at full duty, so that literally is the max without increase pressure.

stevieturbo

I'm not talking about at maximum load.

I'm talking about around idle, and the minimum injection quantity. The S40 does batch fire only. It will always fire the injectors twice per cycle.

So regardless of them being 800cc, they must always be fired twice every cycle, and all injectors have a minimum opening/closing time. And in batch fire, this will always be a double hit compared to that of sequential

If it takes 1ms to open/close....then they will always inject a minimum of 2ms worth of fuel

ie equivalent to 1ms at 1600cc.

xr2wishy

iTrader: (2)

That just means the ecu needs setting up for the injectors. You wouldn't just fit them and hope would you.
I had batch fire setup on my zetec turbo, no issues. Also opening and closing times should be calibrated for, so it won't work like that.

stevieturbo

There is no setting up. Batch fire is batch fire. You cannot calibrate for basic physical limitations.

If there's too much fuel down low because there is too much injector, no amount of dreaming will fix it.

xr2wishy

iTrader: (2)

i get your angle now then.
large injectors can be a little trouble some at low pulse widths, although i did find the 60lbs i used were pretty good in batch firing, there was a little hump at low load and low rpm though so had to alter timing to get it to run smoothly enough.
deka's are quite good to be honest with opening/closing times though.
but has been noted that newer generation bosch ones seem to be better at low pwm's now and are even more linear than the siemens, which aren't bad at all.