Trouble with COS5 and 60lb injectors

[jet231]

Hi,

I'm currently trying to get my car running on a COS5 system. The operating system is 01290005. It is an ls2 turbo engine with 3.3bar MAP (MAF-less) and using siemens deka 60lb/hr injectors. It also has a cam around the 227/227 at 50, a FAST102 manifold and t/b.

Basically for a base tune, I copied a ve table from another n/a vehicle I did which had a similar cam. I then changed the IFR table to a flat 8.73g/sec. The fuel system is a non-return setup but it is vacuum referenced. With the pumps running and vac hose off, it is 58psi. The MAP sensor scalar is set to 430 and the offset is 10. Everything else in the tune is fairly stock.

Can anybody see a problem with this at all? The car will fire from a crank but stall immediately. It is a transplant, so the VATS is off and there is no BCM.

Thanks

[darcy]

I haven't read of anyone having success using that MAP sensor.

http://forum.efilive.com/showthread....p-sensor/page3

[joecar]

How can you have a non-return MAP-referenced system, since there is nowhere to bleed off excess pressure...?

for example, when MAP drops, the FPR will now need to bleed off some fuel to drop the rail pressure.

[jet231]

I have two bosch 044's feeding a -8 hose to the fpr. From the fpr I have a -8 hose running to the front splitting into two -6 feeds for the rails. I have a return hose from the reg back to the surge tank and a vacuum line run from the front of the car to the rear (where the reg is located).

[joecar]

Ah, ok, I see... your MAP reference line is very long (it behaves like a delay line, MAP signal arrives at FPR delayed).

[joecar]

This:

I haven't read of anyone having success using that MAP sensor.

http://forum.efilive.com/showthread....p-sensor/page3

With key-on-engine-off, what kPa does MAP show on scantool (with your scaler set to 430)...?

[jet231]

Yeah it will be a bit delayed but it will be tuned to suit. I think I will try another MAP sensor after reading that thread. Cheers for the help guys. Sounds like the exact problem I'm having.

[jet231]

I bought a 2bar map. Delphi p/n281397776. Same dramas though. Scaler set to 190 and offset 10. 100kpa with key on.
Anyone care to have a look at the tune? Need a fresh set of eyes..

[darcy]

Can you post the tune?
(I can't seem to find it in this thread if you already have)

A log too would be helpful.

[5.7ute]

Siemens 60 data in efilive format here.
According to the transferred data, G/sec should be 9.24 across the board.