- Wed Jan 18, 2023 5:44 pm
#60663
I posted on the FB pages and struggling to find a path towards an answer.
My car using a UA4C Fishdog from SpeedyEFI, I love it so much I bought another for a future project, and got a 3rd for a customer project.
Here is some back story. I have no previous standalone tuning, but some piggyback stuff with an AEM unit. I am familiar with tuning parameters, not exactly green, but not tech savvy one bit.
Last year I got it running on my car, a 96 Tercel turbo autoX build, using the existing batch injection & batch fire. I initially made a jumper harness to be able to go back to stock when I needed it to work. I had it working within a couple hours, but it took a few weeks of occasional messing about to get it driving. Once I started getting my head wrapped around it I permanently installed it by eliminating the jumper. All was well. The only change to the car was to a GM IAT so it can be screwed in. Car was running good. Started upping the boost, went to bigger injectors but then started running out of ignition at higher boost levels. Decided to go "all in" and while going sequential COP with VAG coils, I also made the injection sequential. Also implemented boost control.
This allowed an immense improvement in overall drivability. Car ran cleaner, smoother and just better.
Ran like that for a couple months, then the GT2554R turbo went bad. In a pinch I threw on a GT1548 I had but it overboosted to the moon regardless of wastegate setting, even off which should default to around 6-7psi it would moon boost over 20psi. So that sent the rods out.
Fast forward to xmas break. I rebuild the car with a gen1 bottom end with better rods and slight more compression, built a new tubular manifold, got a GT1752 turbo. I could not use the gen2 pump on a gen1 to retain the stock crank trigger, so I got an external 60-2 wheel and made a new mount for the original sensor. The mount is steel.
Got it running and retimed and it seemed ok. But then I had odd cutout at 3800 like a switch. Checked everything, 100times, tunerstudio, car, grounds, etc. The only real standout was slight runout of the trigger wheel. I minimized that and it seemed to help a little. Played with trigger settings, even switched to falling edge vs rising just to see. No real changes other then occasionally I can rev it out. Somewhere along the line I lost the 3800, and now it often in the 43-4800 range with the occasional 5200. Redline is 6300. I should note it does this regardless of load or throttle...strictly RPM. In the beginning it would nearly shut off...now its just blips/breaking up.
Today, I thought well maybe its something else like dwell. Kicked the dwell up a little, revised the curve too to make it 100% at running voltage. No difference. Still does it. Meanwhile I have been retuning the car for larger injectors (with actual offset data) so that had improved idle quality with lights and fans. I have the tune pretty sorted out until the cutout issue. I have returned the main dwell back to where it was.
On top of all this, the tooth logger does not work for me at all, I even tried uninstalling TS with no change. Makes it really hard to diagnose this issue.
My car using a UA4C Fishdog from SpeedyEFI, I love it so much I bought another for a future project, and got a 3rd for a customer project.
Here is some back story. I have no previous standalone tuning, but some piggyback stuff with an AEM unit. I am familiar with tuning parameters, not exactly green, but not tech savvy one bit.
Last year I got it running on my car, a 96 Tercel turbo autoX build, using the existing batch injection & batch fire. I initially made a jumper harness to be able to go back to stock when I needed it to work. I had it working within a couple hours, but it took a few weeks of occasional messing about to get it driving. Once I started getting my head wrapped around it I permanently installed it by eliminating the jumper. All was well. The only change to the car was to a GM IAT so it can be screwed in. Car was running good. Started upping the boost, went to bigger injectors but then started running out of ignition at higher boost levels. Decided to go "all in" and while going sequential COP with VAG coils, I also made the injection sequential. Also implemented boost control.
This allowed an immense improvement in overall drivability. Car ran cleaner, smoother and just better.
Ran like that for a couple months, then the GT2554R turbo went bad. In a pinch I threw on a GT1548 I had but it overboosted to the moon regardless of wastegate setting, even off which should default to around 6-7psi it would moon boost over 20psi. So that sent the rods out.
Fast forward to xmas break. I rebuild the car with a gen1 bottom end with better rods and slight more compression, built a new tubular manifold, got a GT1752 turbo. I could not use the gen2 pump on a gen1 to retain the stock crank trigger, so I got an external 60-2 wheel and made a new mount for the original sensor. The mount is steel.
Got it running and retimed and it seemed ok. But then I had odd cutout at 3800 like a switch. Checked everything, 100times, tunerstudio, car, grounds, etc. The only real standout was slight runout of the trigger wheel. I minimized that and it seemed to help a little. Played with trigger settings, even switched to falling edge vs rising just to see. No real changes other then occasionally I can rev it out. Somewhere along the line I lost the 3800, and now it often in the 43-4800 range with the occasional 5200. Redline is 6300. I should note it does this regardless of load or throttle...strictly RPM. In the beginning it would nearly shut off...now its just blips/breaking up.
Today, I thought well maybe its something else like dwell. Kicked the dwell up a little, revised the curve too to make it 100% at running voltage. No difference. Still does it. Meanwhile I have been retuning the car for larger injectors (with actual offset data) so that had improved idle quality with lights and fans. I have the tune pretty sorted out until the cutout issue. I have returned the main dwell back to where it was.
On top of all this, the tooth logger does not work for me at all, I even tried uninstalling TS with no change. Makes it really hard to diagnose this issue.
Attachments
current tune
(10.76 KiB) Downloaded 27 times
(10.76 KiB) Downloaded 27 times
lastest log
(141.25 KiB) Downloaded 26 times
(141.25 KiB) Downloaded 26 times
Last edited by malibuguy79 on Wed Jan 18, 2023 6:30 pm, edited 2 times in total.