Can Hp Tuners change Firing order on the pcm?

[daftinnovations]

I currently have been tuning my 04 gto engine in my Toyota Cressida also with help from a local shop. I love hp tuners. I have a Lexus v8 in my Toyota truck. 1uzfe 4.0 twin cam 32 valve setup. The stock ecu is not really tunable. I already have the crank pulley modified to hold the ls1 24x reluctor wheel with it properly timed as well as the cas hooked up and all the ls1 sensors, coil packs, knock sensors...

I was hoping to be able to tune it all with ls1 throttle body, map sensor, maf, and eventually turbo charge the setup. I know people have told me to just use megasquirt.. but I would rather not.

I know I can just re pin the ecu to change the cylinders that i want to fire but I was curious if there was a way to change it in the pcm itself.

firing order
ls1 - 1-8-7-2-6-5-4-3
1uzfe - 1-8-4-3-6-5-7-2

Thanks

[daftinnovations]

I posted a bit prematurely without doing enough searching. I found a guy on this thread trying to put ls1 management on a Chrysler motor. Firing order is the same as my Toyota motor. basically what happens is that it will never go into closed loop because the bank fuel trims wont be correct. On the Chrysler you can just get a cam reground the same firing order as the ls1 and have no issues. The Lexus v8 is 32 valve 4 cam so will be a bit more money to do that!

A way to get rid of this is to go speed density and not run o2s ?

[daftinnovations]

I just emailed support to get the new beta. I guess this has an option to change what injector cylinders are on what banks.. this will fix my issues.

[copley87blazer]

Have fun re pining the ecu,

[wyochimneysweep]

i think theres a tab with abitly to change the injector order

[Fast9C1]

What you are trying to do is the same thing everyone that has ever installed a 24x kit on a Gen1/2 small block has done (same 18436572 firing order). The injector bank reassignment just tells the PCM which O2 sensor is affected by which injectors. That is important if you want to have sane closed loop fueling.

Apparently, the part of the firing order that we don't have access to is the physical one. You need to be mindful of this when wiring up the injectors AND the coils.

[Chris@HPTuners]

the ECM is hardcoded to fire the injector drivers and coils in a particular sequence it is up to you to wire them correctly (GM generally labels them sequentially after crank reference sync is achieved, Cyl A,B,C etc.). The firing order tables that are shown are usually for misfire disagnostics and fuel bank assignment.

Chris...

[daftinnovations]

Thanks guys. I have some progress thus far on getting my trigger wheel setup on the crank pulley. I will be building something to hold the crank angle sensor this week as well as a throttle body adapter. I have an Idea on deigning the 1 tooth wheel for my cam gear for the cam angle sensor to read from as well. I figured I would have to re pin the pcm to change my firing order. Some of the cool things is that the temp sensor has same 12mm x 1.5 thread pitch, knock sensors use same threads as well. I trying to use the current 1 wire knock sensors that the Toyota motor has. Some people might say.. why not just use megasquirt.. at this point It probably would be cheaper to do. Once you buy a ls1 harness, pcm, throttle body, water temp sensor, crank angle sensor, cam angle sensor, air temp sensor, map sensor, 02 sensors, coil packs, maf - if not speed density tune, it seems like it starts adding up real quick. Not to mention the custom adapters, brackets to get everything working. The harness needs to be re pinned, you need to already own or purchase hp tuners in order to tune the vehicle. I have used megasquirt and I think its to ghetto and generic. I feel like its something I bought from radio shack. I also like the challenge of making this work.

[blownbluez06]

the ECM is hardcoded to fire the injector drivers and coils in a particular sequence it is up to you to wire them correctly (GM generally labels them sequentially after crank reference sync is achieved, Cyl A,B,C etc.). The firing order tables that are shown are usually for misfire disagnostics and fuel bank assignment.

Chris...

In other words, if you don't get your driver and passenger bank assignments correct for the injectors, the PCM will go ape sh!t when it goes into closed loop and tries to make any fuel adjustments and you'll end up with a runaway freight train effect on your fuel trims.

[daftinnovations]

Ok everyone.. Got the ls1 to 1uzfe throttle body adapter finished. The first prototype we forgot to flip the idle air passage.. that's fixed now. Throttle body sits a tad high but I have plenty of clearance under the hood. Stock 1uzfe is 70mm tb and ls1 is 75mm. Lexus did make a front facing intake that would put the throttle body in a better spot. This manifolds about $250. Once I get everything working I will be changing over to that.







The cam trigger we decided to make a single tooth setup like stock ls1. We mated it into 1 of the 1uzfe cam gears and are going to machine the cover that will take place of the original cap and have have the ls2 style cam angle sensor for the pickup. We also counter balanced this cam wheel as well.





Pic of before we machined it.



In morning I will machine and snap some pics of the cover that will hold the ls2 sensor. Getting a bit closer everyday.

[daftinnovations]

Got the whole cam position sensor plate and wheel completed. Just need to make a bracket for crank position sensor and try to start engine.

[daftinnovations]

More updates. It runs. Well I need to let it warm up and do a crank relearn procedure.. once it warms up its hard to keep it running. I guess its something to do with injector vs ect or whatever the multiplier. I will start playing with that next.

I will post a video and a log of a full start up and warm up to see if anyone can chime in.

Here is a couple random pictures I recently took.

[Tigre_loco]

Cool project!

[detroit]

very cool, wanted to do very similar with an old buck motor...props for your fab work.