low BLM

[stew86MCSS396]

Throw the Harris chip in the garbage can and start over with a stock file for your truck.

If you are running without a cat that cam will always have a slight fuel smell to it around idle.

Assuming you are running the stock 61 lb/hr 350 injectors the 18 psi spring, much less the 14 psi spring is low. Going to need more like 22-24 psi to support the 350-375 HP that engine is capable of.

You need to get a performance oriented Vortec spark map like the one I have posted numerous times on here in the timing maps. From there you need to up the fuel pressure to atleast 22 psi. Set your injector flow constant to match the new flow rate. From there you will need to dial in the VE table.

Have you set your NEW injector flow constant? You need to do this first and can calculate it bottom of page here: https://www.witchhunter.com/injectorcalc1.php

What are you doing to the VE tables that made it move from 90 to 105? Don't get me wrong...I want you to dumb it down so I know you know what you're doing.

[dhworkin]

Thanks for helping me with the injector calculator. I left the constant at 61 pph bc I didn’t know that it had to be changed. You want to make sure that I know what I’m doing, the obvious answer is (not really). So with 350 hp the calculator says 109 pph, does that mean that I should change the constant to 109? I input 12 for old and 22 for new fp and I got a new flow rate of 24, what should I do with that calculation? Thanks for the help, I am enjoying the process.

[Kitch]

My PCM has provision for a scalar to set the "Injector Flow Rate (TBI lb/hr)", I just input the new calculated value there.
This is not the most technical explanation but I've found if you just increased the fuel pressure you would be way rich, you can manually edit the VE table to compensate for the increased fuel flow (reduce the values) or in my case I can just change the Injector flow rate and seems to have a similar effect.

[Kitch]

With my 8626 PCM the Injector flow rate value is also used for the TunerPro MPG calculations.

[dhworkin]

Ok, I was doing it wrong. I tend to complicate the easiest of things. As soon as I looked at your screen shot I understood. Thanks Kitch. I understand TP5 and have no problem making changes, my question was about the why and not how, bc I input old FP, then new FP but didn’t fill in old flow rate before calculating and was getting unusable numbers.

[donf]

My PCM has provision for a scalar to set the "Injector Flow Rate (TBI lb/hr)", I just input the new calculated value there.
This is not the most technical explanation but I've found if you just increased the fuel pressure you would be way rich, you can manually edit the VE table to compensate for the increased fuel flow (reduce the values) or in my case I can just change the Injector flow rate and seems to have a similar effect.

$OD Bin has this too and I learned if you over or under estimate it you can end up with some really impressive or unimpressive VE% depending on what way you go. A lot of other ecms have the same thing. On another board some hot head was bragging that his VE% was way over normal, he got schooled by the other members. There are spread sheets here that help you figure out the proper numbers. The best way is to have the injectors cleaned and tested at a particular pressure.

[dhworkin]

I can not figure this out. It's been 2 years and I'm getting nowhere and I wish there was someone local to hire and get it right. I don't have to drive a lot because I live in a small town but want to drive to the coast of Oregon this summer. Can I pay one of you guys to help? This is the log after injector and FP calculation.99.xdl

[donf]

You can do it. Sure I will help you no charge. Members here helped me when I needed it and now its not so hard. What have you been doing? Do you have the spreadsheet to insert your log data? Post up your current bin with changes.
Have you checked your fuel pressure with a good gauge? I just watched your last datalog. Its not bad, it needs work though. Also when you are logging, remember slow throttle movements, especially at first. Toward the last you got on it fast, then let off fast filling a few cells with one hit wonders.

[dhworkin]

I start with a bin that I loaded from this site, set initial timing at 10 deg advanced (same as the distributor) then delete EGR and change injector constant and FP to match the calculation for them with a 330 HP engine. Next I copy and pasted vortec timing from spread sheet into bin, disconnect battery for a couple minutes (don't know if that's required), reconnect battery and load bin to the emulator. I have logged data (like instructed) and used the VE spread sheet, but that was with the old injector flow and FP. I'm going to disable PE and log data after 2 o'clock today and will post after. Earlier today I was emulating and dragging my VE tables around to try and figure it out and hit save by accident so I started a new bin BJYK_95_C-K_Truck_5_7.bin