Running a 1uz with aftermarket ECU and no ICS

[stradlater]

SO I've got the Haltech Sprint 500 on the 1uz, with no ICS.

I can get it to idle, but getting it to start is a nightmare.

I have the injector pulse time at 0.4ms at idle and that seems to give it the right AFR, but then when I hit the start button the prick won't start until I move the injector pulse time up to like 1.5ms

Can you have an engine run without an ICS?

[JP]

isn't there a pre-crank prime and additional cranking enrichment available on the haltech?

[JustCallMeOrlando]

Does it have separate control for cranking fuel?

[CrUZida]

Engine will run without ISCV but you'll need to block the ISCV hole and crack the throttle open a little bit (or severely restrict the ISCV opening).

With the ISCV opening fully open she'll rev at 3000rpm.


As the others have said, there will be a cranking enrichment map with is a fuel vs coolant temp map.

[stradlater]

Thanks. I have already blocked off the iscv ages ago with a big chunk of alloy. (Only about 8mm thick.:-) )

I've got it so the throttle is cracked slightly now and it seems ok, but I've yet to find the crank enrichment table.

I've got a 0RPM row on the injector map, I've used that as cranking enrichment, maybe that's suitable???

I've got a Fuel vs Coolant temp map, and that works fine, but it doesn't DIRECTLY correlate to cranking enrichment when the engine is hot?

ANyway, I've got some testing to do on that front

More importantly, there's one map I've yet to figure out, the "Injector Dead Time" map

What does that do?

[JP]

Injector dead time is quite important, also known as injector latency. Depending on how the deadtime map is configured, it usually compensates for deadtime v's battery voltage or even a 3D map of deadtime/voltage/fuel pressure.

You need to have the injectors tested to get an accurate representation of the real deadtime values, the other way if you dont know the deadtime values is to start with about 1ms at 14V and tune the engine so you have a stable rpm, load and AFR. Once stable either use an electrical load tester or disconnect the alternator and monitor the AFR with a wideband as the voltage decreases, as the voltage decreases you adjust the corresponding deadtime values so you have the same AFR.

If you're lucky the deadtime values will be listed on one of the various websites out there for denso/bosch/siemens etc, but a lot of those dont list the pressure the values were measured at. Deadtime is related to fuel pressure also.

One example of an injector deadtime list can be found here:
http://injector-rehab.com/kbse/lag.htm

And a page detailing how someone measured it can be found here:
http://blog.nsfabrication.com/2010/0...d-time-part-1/

[stradlater]

Hrm, thanks mate.

Because I've configured all my fuel maps and compensations to be around 1ms injector time, but it's still putting out 1.9ms.

Which means it either takes into account the injector dead time, OR, there's another compensation I'm not taking into account.

[JP]

Do you have 0.9msec in your main fuel control table?

[stradlater]

I have 0.6 in my main fuel control table
so I was expecting something like 1ms in the actual firing time after the compensations i know about.