I'm jumping a generation as there seem to be more EFI conversions in C3 and C2 doesn't really have a Tech/Performance section. Some of you may remember the long running (now at 20+ years) Project NoFlight. I've recently changed it to a Holley Terminator X as I no longer have a 16 bit laptop capable of talking to the original Accel Gen 7 system. The conversion to the Terminator has so far been a big improvement. The car runs much better now with minimal 'learning' than the Accel system ever did. The Hiborn IR/8-stack is a different animal than the typical manifold and throttle bodies. The Holley 'Wiazrd' GCF was way off. Fortunatly the Holley laptop tuning software package contains a GFC for a 502 BBC with a Hilborn system. I adjusted it for displacement and my injectors, and it was much better behaved from the start than the 'Wizard' configuration. I've been driving the car over as wide a range of conditions as I can rationally reach on the local streets. The 'learning' map shows some drastic changes to the BBC Hilborn GCF at lower RPM (30%) then transitions to fairly small adjustments going to higher RPM. I attribute most of that to the BBC GCF likely (my guess, no documentation) being for a 502 crate which has a much milder cam than my motor. Above 2500 RPM, about the bottom of my cam, the 'learning' adjustment starts to rapidly transition to close to the baseline fuel map by 4000 RPM, which is as high as I could get running in 2nd gear on the local roads.

I'd like to put the learning map into the baseline fuel. My question is what if anything did you do or do you recommend for blending/smoothing the baseline fuel map outside of the on-road tuning area. I'd like to get it on a chassis dyno sometime where it would be possible to tune/'learn' the map at higher throttle/RPM regions but that will need to be something for the future.

Thanks

 

When the terminator system first starts learning, as you described, you saw large percentages of fuel changes. Normally I advise partial transferring of the learn fuel to base, not 100% of the large changes. In the areas outside of your learning leave them as they are for now. For example, highlight the whole learn table, right click, then select the 'offset' option. In the blank field, type "*.75" or "*.5" depending how conservative you are. This will cut your values by 75% or 50%. Then transfer those new values to base. In the beginning, when you are making large fuel changes, I usually smooth the whole table. Later on, as your changes get smaller, I don't take that approach. Then allow your system to learn fresh in the drivable areas and repeat the process after you've driven some more. There will be many areas of the fuel table that you'll never really enter. Some of the areas you may tinker with manually, some you'll never touch. Smoothing the whole table at first will drive some of the unused areas into more reasonable numbers. I'm not sure this all answers your question, but I hope it will help.

KT

 

That sounds like a good approach. Taking a .7 step is a typical convergence scheme. It should help the system from oscillating on the Closed Loop. I didn't know you could scale the learn table.

Thanks.

 

Yes, you can scale it as well as perform any mathematical operation on it. Sometimes I copy it in it's entirety to the clipboard, make the offset adjustments, transfer to base, then restore the original table to learn on top of! Sometimes I'll scale the new learning down and let the system relearn.

 

Also - check out holley sniper for dummies in the "sticky section" of this C3 section. Although the subject focuses on the Sniper, the Terminator software is very similar, and the tuning tips apply universally.

 

I've been talking to a recommend Hilborn tuner, Starr Performance. Would be limited where on map could tune on streets so want to look into if I could get on a friend shop chassis dyno and then have Starr tune remotely. Concept for the spring as I'm running out of weather here.

 

The Holley Terminator seems like a good controller for those of us growing beyond the capabilities of our Holley Sniper EFI systems.

The Holley software is very similar and with a little help from my friends who sold the Holley Terminator to me I will get it up and running. The plan is for a short single plane intake with multi-port EFI using a thin dry throttle body and the Terminator to control all the parts involved.

The suggestion of reading the section above Holley Sniper for Dummies is wise advice! There is a lot of good information there.

 

Just FYI over on LS1tech.com there is a guy that can do remote tuning on Holley stuff. Search Andrewb.

 

Thanks. Will take a look.

 

Finally making some progress. Re-indexed the shifter and re-aligned and adjusted the TV linkge/cable and was able to get up to 60 without the severe surge above 50. Nice second gear roll-in with automatic shifting between 4000 and 5000 RPM (EFI said 4800). Still under 1/2 throttle.

All the 'Learn' values are now 7% or lower after transferring prior learn and slight smooth. 'Learn' at high throttle/RPM is under 2% even where it hasn't been before so the Holley Hilborn EFI map is looking pretty good once it starts making power.

Hopefully my stress level will come down now. Was pretty high after the heavy surge between 50 and 60 the other day. Going to need to find a chassis dyno (probably in the spring) to do much more envelope expansion.