I have a '91 Civic SI hatch that has a stock B16a2, and To4e turbo kit pieced together which is running S300 on DSM 450's. I tuned the car myself and it runs pretty great on 9psi, but there is one NAGGING little thing that I have yet to figure out how to completely clean up.. and that is, when I am running the car hard through the gears it will give me an ever so slight sputter before picking back up, rather than just running cleanly through the gears. It has no issues whatsoever if you go quickly to WOT within the same gear from cruising/light load, but its only when you go from 1-2, 2-3, 3-4, etc. that it will ever so slightly sputter as soon as you get back on the gas after releasing the clutch. It's almost un-noticeable but its something i would really love some assistance on cleaning up if anyone can offer some suggestions.

 

Did you tune your tps tip in fuel trim? What injectors are you running? What does your afr do when the sputter happens?

 

The injectors are DSM 450cc, I've datalogged it twice and it goes lean for a millisecond before catching back up. I'm sitting at about 42% on the TPS tip in trim right now, thats where it seemed to work best for me. 39% was close, 40% was closer, 41% was even CLOSER, 42% was even CLOSER closer, and 43% made it start sputtering just a hair more than when it was less than 41% so I put it back where it seemed to work best at 42%.

 

You need to keep adding fuel to the tip in until you no longer go lean after shifting. On you data long you should see it spike lean (from lifting to shift), but then the afr should go back to target. You need to keep making changes and log it every time you make a change to see if that change made it closer. If it's lean enough to sputter you need to add more then a couple percent. Also do you have the correct dead times entered for you injectors?

 

Fixed it Guys...! The problem was my own user error. Turns out I had wayy too much fuel going for the tip in. I overcorrected it from what the basemap had. Originally it was 0% with the basemap and wasn't working well so I added too much fuel. Dropped it back down to 20% and it's absolutely perfect. Spins through 4th now! 😊✌🏾

Thread can be deleted if neccessary. Preciate it guys!

 

Nice work dude!