Toyota Repository

[ryanallaire]

how u read ECU Toyota with HPtuner sir ??

The tuner doesn't read the ECU, you click 'read vehicle' and hpt sends you a stock file.

[Wynnded]

I was curious to know if anyone has encountered long cranking times after upgrading to 750cc injectors (from the TRDs), not only just long cranks, but needing multiple attempts before the vehicle starts. When it finally starts, there's a plume of rich black smoke from the tailpipe. I have the correct injector constant and offsets. The LTFTs are +/-3%. This TRD S/C'd 2011 has a Walbro 450 fuel pump and the stock fuel pressure regulator, not boost referenced. It transitions to Closed Loop in about 90 seconds. It runs fabulous in every other respect. All that I changed were the injectors, the inj. constant/offsets and adjusted the fuel trims. The only unusual aspect is my elevation of 8000ft. I thought that I was getting somewhere by bumping up the Startup Airflow tables, but as it turns out that really doesn't solve it. Thanks for any feedback/ideas.

[Wynnded]

dont bother calculating the inj const as the maf scale is limited to 512g/s in some ecus after 450g/s the ecu doesnt compensate, you are going to end up running lean anyway, start by leaving your maf as its and adjust the inj const until you are 2-5% richer than your target from there you can adjust your maf.

or you can use stock maf and add 15% fuel or start with trd maf scale before adjusting the injector const

and beside that the 650cc are too small if you already maxed 450cc, we were able to use 1600cc at 58psi (id1300) on the stock ecu no issue other than cracking which you can work around

You mention the issue of hard cranking when using large injectors. I maxed out my TRD 535cc injectors so I installed some 750cc ones. I updated HPTuners with the relevant data relating to them, but now have a pretty consistent hard starting issue. I was wondering if you would be willing to share some guidance as to how this might be dealt with. Any time you can spare to this is greatly appreciated.

[ZPhilip]

I was curious to know if anyone has encountered long cranking times after upgrading to 750cc injectors (from the TRDs), not only just long cranks, but needing multiple attempts before the vehicle starts. When it finally starts, there's a plume of rich black smoke from the tailpipe. I have the correct injector constant and offsets. The LTFTs are +/-3%. This TRD S/C'd 2011 has a Walbro 450 fuel pump and the stock fuel pressure regulator, not boost referenced. It transitions to Closed Loop in about 90 seconds. It runs fabulous in every other respect. All that I changed were the injectors, the inj. constant/offsets and adjusted the fuel trims. The only unusual aspect is my elevation of 8000ft. I thought that I was getting somewhere by bumping up the Startup Airflow tables, but as it turns out that really doesn't solve it. Thanks for any feedback/ideas.

Im in the same boat here. Extended cranking after newly installed Deatschwerks 650cc on my supercharged Tundra. Any help from the much-smarter-than-me members here would be greatly appreciated!

[Romulo]

2008 Land Cruiser (stock)

Looking for Harrop Stage 1 and Stage 2 tune