I have the LT1 in car, car was originally TPI. motor mounts hooked up, fuel lines done, P.S lines done, etc, etc. All wires are hooked up except C100, C105, C210, C220 and C230 connectors. On to...

Hello, as stated before I have 2 LT1s one is a 97 out of a TA. TA one has cut wires, no relays, no fuse box. The other LT1 is supposedly from a Roadmaster but the PCM has Fleetwood wrote on it, again...

Getting ready for my first EFI build, after many back and forths between wether I wanted to go carb, TPI, TBI or LT1 I have settled on a vortec 350 with a LT1 cam OR LT4 hot cam, single plane vortec...

Hello everyone, I just got a 1995 2 door Chev Tahoe with the 7427 PCM. I have heard nothing but good on the 7427. It is my understanding there is only 1 VE table with this PCM. I grasp tuning idle,...

Awesome, thank you!! Now I don’t need to know formulas for figuring BPC in any fashion lol. Thank you very much.

Let me start by saying I can calculate BPC with stock F.P my issue is when you change F.P I don’t understand the formula. Is there anyone that could point me in the right direction for order of...

Let me start by saying I can calculate BPC with STOCK fuel pressure. My issue is I don’t understand how the formula works for calculating BPC with a NEW fuel pressure. Is there anyone that could help...

I have done research and know that VE 1 is data and VE 2 is just an adder. Before I make changes that could harm my engine could someone point me in the right direction of what VE tables look like in...

I appreciate the input Dave. I should have clarified, other than TP for edits and an ALDL is there anything else needed? Do you by chance know anything about my other questions? thanks!

As many of you know I’m planning a 454 tbi build. I have decided to go the EBL route because of the VE learn (as well as many other reasons) such as if I were to go the old chip route by the time I...

Still planning and researching on a tbi build. I grasp getting the vehicle to idle, adjusting BLMs, etc. I struggle with the VE tables. Reading the EagleMark Adjusting VE tables with BLM data...

Could anyone give me guidance on how to calculate bpw of injectors with 65 lb hr injectors, new fuel pressure of 18, old fuel pressure of 25, 350ci. These are example numbers. Formula is SQRT (25 /...

When tuning 7747 ECM VE tables, VE 1 is used from 0 RPM UP TO 3,200 RPM correct? If i understand correctly, VE 2 is added to ALL VE 1 values. So IF I am correct I add VE 1 values and VE 2 values...

First things first, thanks all for the advice and input, I like how everyone is so willing to help others, it’s awesome- you don’t see that much any more I don’t care what the topic is. I’m not...

I would tune using a MAP sensor and narrow band for the time being. I could switch between MAP and MAF if needed. Added a few edits since your reply. Good to hear from ya.

Theoretically, if I were to tune a '94-'95 LT1 ECM / PCM from start to finish, would this be the correct order and method(s) to do so?

Engine would be a: 1994-1995 350ci LT1 with stock bore and...

great read, thank you. So if I understand correctly in whatever editing program (TunerPro, Tunercats, etc) I use just zero the actual offset and add my estimate “offset” to the Base Pulse width,...

found this 4 min video on youtube: https://www.youtube.com/watch?v=Id7zc4NjQfE from what I gathered, you can still run the engine just fine and tune it without touching the offset (aka lag aka...

appreciate the response Steveo. I haven’t messed with LS tuning yet, just heard the software / hardware is expensive wasn’t sure exactly what all was required or the cost. It’s be interesting if we’d...

@Fast 355 do you know how to calculate the injector offset? I have access to one of the correct tbi ecm for TPI conversion. If this is all more work than it’s worth I may just end up buying a 730 ecm...

Thanks for the heads up Dave. So say I was to have the soldering done, jumper done, switches set and now it’s time to change the injector offset. Is this how I’d do it?: Fuel Injector Constant
This...

Thanks dave- so if i were to solder the resistors and add the jumper and change constants, do i have to change anything else such as injector offset if i use oem tpi injectors? Also does it HAVE to...

sounds good 1project2many send archives on over

Hello, I have done some looking around and discovered you can splice the 8 inj for TPI into your existing tbi harness and make a tpi harness. I know you have to change knock sensor and lengthen TPS...

No matter if im tuning a TBI, TPI, LT1, LT4, LS based, "tue LS" or the new LT motors would it be a good idea to follow the steps in this link? I understand 94 LT1s and any motor newer you dont have...