Injector setting's for siemens deka 630

[Perkele]

I have purchased the following injectors for my cosworth and I'm running Ms2 Extra 3.0.3u in sequential mode and I don't know if I can do the Alternative --> simultaneous test to find the best dead time for the new injectors. Luckily the net is full of specs for the 630 deka.

Specifications:
Coil Resistance: 12.5 Ohms / High Impedance / High-Z (No ECM driver modifications required)
Static Flow Rate @ 43.5PSI ( 300kPa ) w/Gas: 60 lb/hr = 630 cc/min = 453 g/min
Static Flow Rate @ 87PSI ( 600kPa ) w/Gas: 85.7 lb/hr = 900 cc/min = 648 g/min
Gain: 0.11ms/mg
Offset: 0.055ms
Turn on time @ 14VDC: 1.14ms
Turn off time: 0.85ms @ 600KPa
Connector: Bosch EV1
Series: DEKA 4 ( DEKA IV )


Lag info from http://injector-rehab.com/kbse/lag.htm
V ms
10v 0.83
11v 0.64
12v 0.50
13v 0.38
14v 0.28
15v 0.17

And I calculated the following (lag/deadtime/injector open time) for mega
13,2V = 0,36ms But can this small value be correct? And does anyone know what is this injector's close time @ 300-400Kpa as the specs tell only @ 600kpa
And Batt corr value
ms/V = 0,12ms
If anyone has found good values for these, I would really appreciate them.

[jsmcortina]

Hey... you could be in luck! I've got a set of what I believe to be the same injector installed in my flow bench at the moment. I'll report back when I've tested them out. I agree that those numbers look low.

James

[racingmini_mtl]

I have purchased the following injectors for my cosworth and I'm running Ms2 Extra 3.0.3u in sequential mode and I don't know if I can do the Alternative --> simultaneous test to find the best dead time for the new injectors. Luckily the net is full of specs for the 630 deka.

You can't change from alternative to simultaneous when running sequential. The code ignores these settings and just does sequential (if you have 4 drivers and a cam signal) which means one squirt per cycle for each cylinder.

What you can do is run in untimed mode and then do the alternative/simultaneous test. The 3.0.3u code allows you to use 4 drivers in untimed mode with injector drivers 1 and 3 firing together and 2 and 4 firing together.

Jean

[Perkele]

Thank you for the info and I'll be eagerly waiting for the test results. I'll have to swap my current 399cc Lucases to the dekas quite soon because I think cyl.3. injector leaks in to the manifold and PW hits the roof @ 5000rpm/1.3bar boost.

And about the calculated lag/dead time it might so small if the manufacturers announcement consists the time from closed to full flow and vs. but doesn't take account the fuel coming out during opening and closing so when testing with mega you might get a bit bigger values as for my current Lucases was good at 0.69ms.

[Paul_VR6]

I agree. I have had good luck running these injectors at ~.75ms dead time.

[jkxr4ti]

I'm running the 80LB versions on a MS1 currently. My settings are 1.3mS opening time, 0.12mS/V Battery voltage correction. I just went off the MFG spec sheet and they seem to be working well now that I have the Hi Res code installed.
Interested to hear anything else that is found out on these.

[Perkele]

Hey... you could be in luck! I've got a set of what I believe to be the same injector installed in my flow bench at the moment. I'll report back when I've tested them out. I agree that those numbers look low.

James

Have you had the time to test these? I've been having some trouble using the simultaneous alternating test the AFR changes so much that the engine stalls. I tried open time 0.3-->1.3ms. At sequential mode I use 0.79ms for now.

[jsmcortina]

I measured 0.4ms @ 13.2V. I'll post the charts in another topic later.

James

[jsmcortina]

Info is here: http://www.msextra.com/forums/viewtopic ... 31&t=41357

James

[Perkele]

Thank you wery much.
Can you tell me what fuel pressure you used and do you think that using P&H injector board will change the open close/times much?
As I'm using Jean's board.

Thank's again.

[jsmcortina]

I was using "standard pressure" from a Vauxhall C20LET fuel rail, I'll have to hook up an actual gauge to confirm.

Using the P&H board with hi-z injectors seems like a poor idea. Best check with Jean on how to disable the "hold" portion and give them full current all the time.

James

[racingmini_mtl]

Actually, while using p&h drivers with high-Z injectors is a more expensive solution than it needs to be, there is nothing that needs to be done to have a fully functional setup. Since the LM1949 senses the current, the hold portion will still try to drive the injectors at 1A so there will effectively not be peak and hold phases. There might be a very small dip in current at some point but that will not have any effect. And if the battery voltage can't generate 1A with some injector, the driver will simply remain in saturation.

And I've added a comment on the dead time testing thread about the need to use the same drivers (or at least driver type) as what will be used on the engine when performing the tests. Since every driver/injector combination may have different results, you can't really infer one result from another.

Jean

[jsmcortina]

Actually, while using p&h drivers with high-Z injectors is a more expensive solution than it needs to be, there is nothing that needs to be done to have a fully functional setup.

That's good to know.

James