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Search: Posts Made By: Dominic Sorresso
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Forum: DIY PROM
02-18-2024, 09:02 AM
Replies: 32
Views: 855
Posted By Dominic Sorresso

Re: Chasing BLMs

Once I have a new VE calcs I look at areas that were not changed using TP graphing. I try to “smooth” areas in between sections that were changed. Smoothing makes a difference in how the motor...
Forum: DIY PROM
02-17-2024, 08:58 AM
Replies: 32
Views: 855
Posted By Dominic Sorresso

Re: Chasing BLMs

Recall that the activity of the INT is affected by the Prop Gain. If the PG isn’t right, the INT will chase around trying to compensate.
Forum: DIY PROM
02-08-2024, 09:27 AM
Replies: 27
Views: 1,637
Posted By Dominic Sorresso

Re: Ostrich II battery replacement??

I’ve been using an Ostrich V1 and 2 for years. Never had the battery issue. However, if I am going on a long trip, I carry another prom loaded w a recent tune that will get me home. I may even backup...
Forum: DIY PROM
12-24-2023, 10:52 AM
Replies: 12
Views: 729
Posted By Dominic Sorresso

Re: Changing to Open Loop while Driving.

Agree.
Forum: DIY PROM
12-21-2023, 08:19 AM
Replies: 32
Views: 855
Posted By Dominic Sorresso

Re: Chasing BLMs

Here in Illinois we have 10% Ethanol. So my cal allows for an adjusted Stoich based on that. Be great to integrate a flex fuel sensor.
Forum: DIY PROM
12-20-2023, 09:29 AM
Replies: 32
Views: 855
Posted By Dominic Sorresso

Re: Chasing BLMs

I find that I need to increase AE at small delta MAP%(LT5 doesn’t use delta %TPS for AE) to avoid invoking SA Retard.
Forum: DIY PROM
12-19-2023, 12:36 PM
Replies: 32
Views: 855
Posted By Dominic Sorresso

Re: Chasing BLMs

When I was tuning my 84 Xfire using a 7747, I would lock BLMs and use the INT instead since the BLM update rate on the 7747 was very low. The INT updated more frequently. Then I converted over to...
Forum: DIY PROM
12-19-2023, 09:49 AM
Replies: 8
Views: 410
Posted By Dominic Sorresso

Re: Fuel injector tuning

For the LT5, the OE injectors are not really available and so ACCEL, FICs, and a few others. Its not easy to get Offset datasheets for these and I have resorted to sending them out to be both...
Forum: DIY PROM
12-18-2023, 11:21 AM
Replies: 8
Views: 410
Posted By Dominic Sorresso

Re: Fuel injector tuning

Link?
Forum: DIY PROM
12-17-2023, 10:44 AM
Replies: 32
Views: 855
Posted By Dominic Sorresso

Re: Chasing BLMs

none that I can determine. Locking the BLMs negates any change to the VE table which is where I do my WOT tuning rather than the PE table. VE is more granular.
Forum: DIY PROM
12-16-2023, 09:38 AM
Replies: 32
Views: 855
Posted By Dominic Sorresso

Re: Chasing BLMs

Whenever I went to the track, I would download a cal that would set BLM upper/lower limits to 128. Do that for dyno tuning also.
Forum: DIY PROM
12-10-2023, 10:17 PM
Replies: 26
Views: 843
Posted By Dominic Sorresso

Re: Miniram ~10% bigger injectors on cyl's 1-4

ULT,

My LT5 has also gone thru an injector “evolution”. I’ve been using FICs and as u inow the LT5 uses 16 21# injectors for both primary and secondaries. There’s VE for both states of operation,...
Forum: DIY PROM
10-22-2023, 09:36 AM
Replies: 10
Views: 964
Posted By Dominic Sorresso

Re: Opinions - Knock retard, real or false knock?

Ult,

I went thru the same issue as u have for a while. I flip flopped between “yeah real” to “ no false”.
And it seemed to occur with small incremental increase or decrease in MAP kPa. And it was...
Forum: DIY PROM
10-15-2023, 09:36 AM
Replies: 4
Views: 340
Posted By Dominic Sorresso

Re: Balancing injectors

Driveit,

In my case, its the P/S bank that runs rich and/or is burning oil. The first pic is of #2 and 4 on the passenger side, while the next 2 pics are of #3 on D/S.
...
Forum: DIY PROM
10-14-2023, 11:52 AM
Replies: 4
Views: 340
Posted By Dominic Sorresso

Re: Balancing injectors

Spreadsheet appears to be available. Basically, I am proposing to swap injector pairs so that the injector flowing the least in each pair will take up the primary position, while the greater flowing...
Forum: DIY PROM
10-13-2023, 06:11 PM
Replies: 4
Views: 340
Posted By Dominic Sorresso

Re: Balancing injectors

https://cimg2.ibsrv.net/gimg/www.thirdgen.org-vbulletin/1191x639/capture_ff0e8204df1617150c2a41d49c913d1f20ae6b7a.jpg
Forum: DIY PROM
10-13-2023, 06:01 PM
Replies: 4
Views: 340
Posted By Dominic Sorresso

Balancing injectors

In my efforts to develop a great tune for my LT5, I had taken my 16(1 primary/1 secondary) injectors to be flow tested. and from this flow test I paired injectors so as to give me as equal a fuel...
Forum: DIY PROM
10-02-2023, 01:15 PM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Re: Running a bit leaner is smoother/better

Thanks RBob. Sound like CVA may not be relevant to what I am trying to address but its always educational to hear about one of “rabbitholes” you and Grumpy have explored.
Forum: DIY PROM
10-01-2023, 12:05 PM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Re: Running a bit leaner is smoother/better

So by varying the closed valve angle, ur using the "tail to wag the dog" so to speak. Changes to the CVA, affect injector timing overall in terms at what degree the injector begins and ends...
Forum: DIY PROM
10-01-2023, 08:22 AM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Re: Running a bit leaner is smoother/better

So RBob, in ur instance the value used for the parameter was what? And it represented what?
Or was it simply an option that u checked or unchecked?
Forum: DIY PROM
09-30-2023, 02:28 PM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Re: Running a bit leaner is smoother/better

RBob,

I believe that I understand the closing valve angle to be a fixed point, ie does not change w PW. What does change is the starting point of the injector opening based on the duration of the...
Forum: DIY PROM
09-28-2023, 04:12 PM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Re: Running a bit leaner is smoother/better

Let’s see if I understand. And I am very appreciative of ur indulgence, The valve closing angle is a fixed point in terms of when it occurs during the crank revolution. The calc’d PW is accommodated...
Forum: DIY PROM
09-28-2023, 10:00 AM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Re: Running a bit leaner is smoother/better

RBob,

Not totally familiar w Injector Closing Angle. If u could expound on that, thank u. I’m certain I have a Compensation Load v RPM table. Never really looked at that before. Did u modify the...
Forum: DIY PROM
09-26-2023, 03:24 PM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Re: Running a bit leaner is smoother/better

The more obvious indicator for me is bank to bank rather than front to back w the D/S bank being the “lean” side. Now I have wondered if there isn’t an FP drop from left to right bank given that the...
Forum: DIY PROM
09-26-2023, 10:45 AM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Re: Running a bit leaner is smoother/better

Do tell RBob!
Forum: DIY PROM
09-25-2023, 02:00 PM
Replies: 5,155
Views: 636,533
Posted By Dominic Sorresso

Re: Tuning with the EBL

You should ask ur questions. There are plenty of people that use some version of EBL that likely can answer. However, u should familiarize urself w how it works and the basics of tuning.
Forum: DIY PROM
09-24-2023, 10:17 PM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Re: Running a bit leaner is smoother/better

So GM was modifying the PW for each injector.
Forum: DIY PROM
09-24-2023, 05:57 PM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Re: Running a bit leaner is smoother/better

So ULT, what exactly are u adjusting w these trims? Is this a factor applied to PW? Even something along these lines applied to the primary injectors. Don’t need to be concerned w the secondaries as...
Forum: DIY PROM
09-24-2023, 03:44 PM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Re: Running a bit leaner is smoother/better

Thanks guys. I’m happy to have begun a discussion even if only it results in further educating me and hopefully some others.
My operating premise was that the O2 on each side provides the ECM w the...
Forum: DIY PROM
09-24-2023, 11:09 AM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Re: Running a bit leaner is smoother/better

LT5 is SFI. Thanks RBob for chiming in. Always look forward to ur input. Could u explain further as to why that would not be a good strategy? With 2 O2s I know that the O2 input does modify the PW on...
Forum: DIY PROM
09-24-2023, 10:31 AM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Re: Running a bit leaner is smoother/better

Don’t I wish. Earlier somewhere I wished that someone could come up w a hack allowing adjustments of the O2 mv windows on a bank to bank basis.
My passenger side bank is the richer bank, w the left...
Forum: DIY PROM
09-23-2023, 07:15 PM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Re: Running a bit leaner is smoother/better

ULT,

Yes the LT5 has dual NB O2s. And yes I definitely get the “split” blm issue which is very marked at idle but straddles 128 +/- 3 in most other instances
Forum: DIY PROM
09-23-2023, 04:50 PM
Replies: 34
Views: 814
Posted By Dominic Sorresso

Running a bit leaner is smoother/better

I find that actually running something just a bit leaner than 128BLM appears to make my motor run smoother/quieter. Exhaust note was smoother and more mellow. Responsiveness was very good. Overall...
Forum: DIY PROM
09-05-2023, 08:44 AM
Replies: 12
Views: 700
Posted By Dominic Sorresso

Re: How to adjust INT Rich/lean/mean O2 tables? EBL Flash 2

Maybe I could talk RBob into patching the LT5 code to try separate O2mv tables for each bank.
😉😂
Forum: DIY PROM
09-05-2023, 07:53 AM
Replies: 12
Views: 700
Posted By Dominic Sorresso

Re: How to adjust INT Rich/lean/mean O2 tables? EBL Flash 2

I recall u doing that. There was something in LT5 lore that showed something experimental like that during development. Would be nice to be able to modify fueling bank to bank. At idle things are...
Forum: DIY PROM
09-04-2023, 11:00 AM
Replies: 12
Views: 700
Posted By Dominic Sorresso

Re: How to adjust INT Rich/lean/mean O2 tables? EBL Flash 2

The LT5 is bank to bank with separate O2s modifying injector PW. Each of the secondary injectors get firing signal off their corresponding primary injector while using drivers external to the ECM....
Forum: DIY PROM
09-04-2023, 08:46 AM
Replies: 12
Views: 700
Posted By Dominic Sorresso

Re: How to adjust INT Rich/lean/mean O2 tables? EBL Flash 2

There are several threads involving modifying the O2mv for motors with greater overlap. Traxion and RBob have written at length about this. My LT5 has cams and I have changed the O2mv but only for...
Forum: DIY PROM
09-03-2023, 10:33 AM
Replies: 23
Views: 1,044
Posted By Dominic Sorresso

Re: Data Logging Analysis 101

Excellent observations and guidance. I like to simply turn ignition on, not run, and log the sensor values to make certain they are “nominal” or set properly, ie O2, TPS, IAC, etc.
Forum: DIY PROM
06-17-2023, 11:36 AM
Replies: 27
Views: 1,637
Posted By Dominic Sorresso

Re: Ostrich II battery replacement??

Very nice.
Forum: DIY PROM
06-12-2023, 11:17 AM
Replies: 27
Views: 1,637
Posted By Dominic Sorresso

Re: Ostrich II battery replacement??

No I had not. thanks.
Forum: DIY PROM
06-12-2023, 09:31 AM
Replies: 27
Views: 1,637
Posted By Dominic Sorresso

Re: Ostrich II battery replacement??

Anybody want to share which external socket they used for their Ostrich battery replacement?
Forum: DIY PROM
06-11-2023, 09:34 AM
Replies: 27
Views: 1,637
Posted By Dominic Sorresso

Re: Ostrich II battery replacement??

A friend of mine did exactly that a few months ago. What socket did u use?
Forum: DIY PROM
06-05-2023, 03:39 PM
Replies: 11
Views: 3,076
Posted By Dominic Sorresso

Re: Bin offsets for different size chips?

No not checksum disable. Whenever I burned SF512, it comes up w an SES light using the proscribed offsets. It comes up Code 41.
I unchecked that MALF in the cal, and voila it runs fine. Again, not...
Forum: DIY PROM
06-05-2023, 02:45 PM
Replies: 11
Views: 3,076
Posted By Dominic Sorresso

Re: Bin offsets for different size chips?

Well just a quick update. I was able to burn cal onto 27SF512 as outlined in the Moates notes w/o need to stack the bin. However, I needed to make a small change to the bin and I recall now having to...
Forum: DIY PROM
06-03-2023, 08:08 AM
Replies: 11
Views: 3,076
Posted By Dominic Sorresso

Re: Bin offsets for different size chips?

TP,

Thanks. To clarify however, is this saying I can take a 32k bin file and put it directly onto a
27SF512 as long as I use the offsets prescribed? I recall when previously doing this, I would...
Forum: DIY PROM
06-02-2023, 07:14 AM
Replies: 11
Views: 3,076
Posted By Dominic Sorresso

Re: Bin offsets for different size chips?

Reviving this thread since its been soooo long from when I burned proms. Thank u Mr. Moates for the Ostrich. I want to burn a prom to have as a spare w my current cal, in case something goes wrong w...
Forum: DIY PROM
04-26-2023, 10:05 AM
Replies: 5,155
Views: 636,533
Posted By Dominic Sorresso

Re: Tuning with the EBL

If u r using Closed Loop for everyday driving, BLMs will factor into the Open Loop/ WOT calc for determining final pulsewidth. IOW, if ur BLMs are above 128 when u go O/L WOT, then the ECM will...
Forum: DIY PROM
04-20-2023, 08:55 AM
Replies: 5
Views: 430
Posted By Dominic Sorresso

Re: injector tuning question

I would also have the injectors flow checked to assure consistent delivery to all cylinders. Don’t assume!
Forum: DIY PROM
03-24-2023, 08:35 AM
Replies: 13
Views: 766
Posted By Dominic Sorresso

Re: BLM variability at low maps

I always modify VE in the boundary cells as well for that reason. One of the things I do once the VE adjustments is made to a particular cell after a datalog, is to compare the new VE table(s) with...
Forum: DIY PROM
03-22-2023, 08:45 AM
Replies: 13
Views: 766
Posted By Dominic Sorresso

Re: BLM variability at low maps

Fast,

Altho I had my injectors tested for IB, I still get the proverbial “bathtub” in the area of idle along w the dreaded split BLM on my LT5 which no doubt contributes to bathtub curve. The...
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