Tuning Tbi (for probably the thousandth time)

[CountyLineGarage]

I recently rebuilt a 350 TBI for my 95 Sierra. It’s got summits 62cc aluminum heads and lunatis barebones efi compatible cam and lifters and flo tech headers run to 3 inch pipe. It runs great. Just a little bit of surge on idle not sure if it’s the cam or something else(any advice is welcome in regards to that) aside from that does anyone do the prom chips or what other options do I have any links to parts are welcome. It is my daily so whatever down time can be avoided would be nice as well. Thanks!

 

[LA2SD]

The old EPROMs will lose their memory after so many years. I went with the ZIF socket and 27SF512 EEPROM flash chips. Bought an ALDL cable, Moates Burn2, and downloaded TunerPro RT for my 88 C1500. Now I can data log and flash my own. You can read your OE chip with the Burn2 but can't burn them. You can also look up your bin file on Gearhead EFI

http://aldlcable.com/aldl.asp

http://www.moates.net/burn2-chip-programmer-p-197.html?cPath=94

http://www.tunerpro.net/

http://www.gearhead-efi.com/gearhead-efi/

^ Here's a post from another thread that might help. There's also a great sticky in the engine performance & maintenance forum.

 

[Schurkey]

Connect a scan tool, look at the data stream; especially when the engine is surging.

Verify fuel pressure.

I advanced the base ignition timing to 4 BTDC from 0 on my engine. Aluminum heads, but not the same ones you have. ZZ4 intake manifold, OEM TBI and emissions equipment. Vortec L31 short-block including cam and pistons. Someday, I'll jack-up the fuel pressure from ~11 to 13--15 or so.

 

[PlayingWithTBI]

Here's a post from another thread that might help.

There are other options if you want to get into tuning. I'm guessing you probably have the 7427 PCM in which you could use the G1 adapter from Moates. Here's a link on how to.
http://www.gearhead-efi.com/Fuel-Injection/showthread.php?1591-Installing-G1-Adapter-form-Moates

You can get an emulator setup there like the G2 or APU1 AutoProm at the same site. Or get in touch with someone on Gearhead-EFI to help tune it. Dave w (Old School EFI) has helped me in the past.

It’s got summits 62cc aluminum heads and lunatis barebones efi compatible cam and lifters and flo tech headers run to 3 inch pipe.

My setup is similar, same heads, a little stiffer cam, and bored 46mm Throttle Body running 20PSI Fuel Pressure with a Vortec EP381 pump. My SA (Spark Advance) table is quite a bit higher than the stock one was in my 88. After some time tuning with a WBO2 sensor and running open loop at idle I got it smoothed out. What I wound up doing was flatten out SA and VE (fuel) tables at, and around idle. Here you can see what I mean in my Main SA table. HTH

You must be registered for see images attach

 

[CountyLineGarage]

There are other options if you want to get into tuning. I'm guessing you probably have the 7427 PCM in which you could use the G1 adapter from Moates. Here's a link on how to.
http://www.gearhead-efi.com/Fuel-Injection/showthread.php?1591-Installing-G1-Adapter-form-Moates

You can get an emulator setup there like the G2 or APU1 AutoProm at the same site. Or get in touch with someone on Gearhead-EFI to help tune it. Dave w (Old School EFI) has helped me in the past.



My setup is similar, same heads, a little stiffer cam, and bored 46mm Throttle Body running 20PSI Fuel Pressure with a Vortec EP381 pump. My SA (Spark Advance) table is quite a bit higher than the stock one was in my 88. After some time tuning with a WBO2 sensor and running open loop at idle I got it smoothed out. What I wound up doing was flatten out SA and VE (fuel) tables at, and around idle. Here you can see what I mean in my Main SA table. HTH

You must be registered for see images attach

So yeah I’m pretty new

There are other options if you want to get into tuning. I'm guessing you probably have the 7427 PCM in which you could use the G1 adapter from Moates. Here's a link on how to.
http://www.gearhead-efi.com/Fuel-Injection/showthread.php?1591-Installing-G1-Adapter-form-Moates

You can get an emulator setup there like the G2 or APU1 AutoProm at the same site. Or get in touch with someone on Gearhead-EFI to help tune it. Dave w (Old School EFI) has helped me in the past.



My setup is similar, same heads, a little stiffer cam, and bored 46mm Throttle Body running 20PSI Fuel Pressure with a Vortec EP381 pump. My SA (Spark Advance) table is quite a bit higher than the stock one was in my 88. After some time tuning with a WBO2 sensor and running open loop at idle I got it smoothed out. What I wound up doing was flatten out SA and VE (fuel) tables at, and around idle. Here you can see what I mean in my Main SA table. HTH

You must be registered for see images attach

First off thanks for your help and to the rest of the people who gave advice as well! Second I’m pretty new to this whole thing so excuse my ignorance but is what you said about the tuning all one thing or were there a few options as to what goes with what. In other words how does that stuff work. Is that something that I’m going to have to burn chips for or does it adapt it to on the fly tuning?

 

[PlayingWithTBI]

is what you said about the tuning all one thing or were there a few options as to what goes with what.

These are all different options. Unfortunately your PCM doesn't auto-learn (other than minor changes in INT/BLM), you have to data log and tune (modify tables) until you get it right. There's a lot of research to do before jumping in. It's easier to ask someone to tune it for you but, a word of caution, mail order chips aren't the best way to go. They'll help some but won't get you dialed in right. As I said someone on Gearhead-EFI can help but you'll want to be able to flash your own chips so, you can drive around and data log with TunerPro RT, email them the log, they'll tune your .bin, send it back to you, rinse and repeat until it's right. In this scenario you want the software, a Moates burn2, an ALDL cable, a ZIF socket adapter, a couple SST 27SF512 chips, and you're on your way.

You'll want a somewhat working knowledge of EFI acronyms and definitions too. Or at least this dictionary on hand.

http://www.gearhead-efi.com/gm-ecm-pcm-conversion/efi-dictionary.html

 

[CountyLineGarage]

These are all different options. Unfortunately your PCM doesn't auto-learn (other than minor changes in INT/BLM), you have to data log and tune (modify tables) until you get it right. There's a lot of research to do before jumping in. It's easier to ask someone to tune it for you but, a word of caution, mail order chips aren't the best way to go. They'll help some but won't get you dialed in right. As I said someone on Gearhead-EFI can help but you'll want to be able to flash your own chips so, you can drive around and data log with TunerPro RT, email them the log, they'll tune your .bin, send it back to you, rinse and repeat until it's right. In this scenario you want the software, a Moates burn2, an ALDL cable, a ZIF socket adapter, a couple SST 27SF512 chips, and you're on your way.

You'll want a somewhat working knowledge of EFI acronyms and definitions too. Or at least this dictionary on hand.

http://www.gearhead-efi.com/gm-ecm-pcm-conversion/efi-dictionary.html

I’ve heard a lot of good things about Dave w from gear head efi but can’t figure out how to work that forum, they won’t activate my account or something. Is there anyone on this forum that knows anything about it or anybody I could directly contact?

 

[CountyLineGarage]

These are all different options. Unfortunately your PCM doesn't auto-learn (other than minor changes in INT/BLM), you have to data log and tune (modify tables) until you get it right. There's a lot of research to do before jumping in. It's easier to ask someone to tune it for you but, a word of caution, mail order chips aren't the best way to go. They'll help some but won't get you dialed in right. As I said someone on Gearhead-EFI can help but you'll want to be able to flash your own chips so, you can drive around and data log with TunerPro RT, email them the log, they'll tune your .bin, send it back to you, rinse and repeat until it's right. In this scenario you want the software, a Moates burn2, an ALDL cable, a ZIF socket adapter, a couple SST 27SF512 chips, and you're on your way.

You'll want a somewhat working knowledge of EFI acronyms and definitions too. Or at least this dictionary on hand.

http://www.gearhead-efi.com/gm-ecm-pcm-conversion/efi-dictionary.html

also do you have links to the right parts for all of that if so that would be great! Again thank you for your help.

 

[PlayingWithTBI]

I’ve heard a lot of good things about Dave w from gear head efi but can’t figure out how to work that forum, they won’t activate my account or something. Is there anyone on this forum that knows anything about it or anybody I could directly contact?

Did you go to the "introductions" forum and try to post a thread introducing yourself? Note: the little yellow bus is his and his email is just below it.

http://www.gearhead-efi.com/Fuel-Injection/forum.php

 

[PlayingWithTBI]

also do you have links to the right parts for all of that if so that would be great! Again thank you for your help.

Most of the links are on post #2. The rest you can navigate through Moates website to find them. You may want to call or research there to see if you can just solder in a ZIF (Zero Insertion Force) socket or you need to use the G1. Then see where the "start of your device" address is. It sounds complicated but, the "Flash and Burn" utility makes it pretty simple. HTH