Holley terminator 5v output limits
Thread Starter
Joined: Nov 2013
Posts: 6,389
Likes: 558
From: Portlandia
Holley terminator 5v output limits I'm using the 5V output on the I/O plug as a pull-up for the flex fuel sensor, and to power two other 0-5v pressure sensors.
I was fine with the flex and 1 sensor, added a second (dome) and now the FF sensor fluctuates wildly. remove one or the other pressure sensors and it reads alcohol content fine.
Any other places I can grab 5v from safely?
as a side note, this type of failure will strand you. have a tune stashed on your SD card in case your FF sensor fails.
I was fine with the flex and 1 sensor, added a second (dome) and now the FF sensor fluctuates wildly. remove one or the other pressure sensors and it reads alcohol content fine.
Any other places I can grab 5v from safely?
as a side note, this type of failure will strand you. have a tune stashed on your SD card in case your FF sensor fails.
J1 A26, J3 B8 and B22, and J4 20 are 5v out.
When I tune one with flex I do the main tune on whatever fuel they plan on running mostly. If E85 then I tune on E85 and use the flex for pump that way on E85 it isnt using the sensor basically. It also a good practice to have a tune with no O2 sensor incase it goes out, just load your OL tune and drive home.
When I tune one with flex I do the main tune on whatever fuel they plan on running mostly. If E85 then I tune on E85 and use the flex for pump that way on E85 it isnt using the sensor basically. It also a good practice to have a tune with no O2 sensor incase it goes out, just load your OL tune and drive home.
Thread Starter
Joined: Nov 2013
Posts: 6,389
Likes: 558
From: Portlandia
right I have a no 02/no FF stashed on the card. default to 50% alky it'll get ya home.
I ended up buying a cheap 12v to 5v step down thats good for 3A, I'll put all my sensors on that. I'd be curious to know how much draw the cheapy china pressure sensors have.
as a side note I just recently started eating bosch sensors with the terminator. i dunno if its the wide overlap cam and super short dump off the turbo but they get wacky like every 3 months. considering an HP upgrade just to get an NGK sensor in there.
I ended up buying a cheap 12v to 5v step down thats good for 3A, I'll put all my sensors on that. I'd be curious to know how much draw the cheapy china pressure sensors have.
as a side note I just recently started eating bosch sensors with the terminator. i dunno if its the wide overlap cam and super short dump off the turbo but they get wacky like every 3 months. considering an HP upgrade just to get an NGK sensor in there.
The terminator uses the same wideband sensor as my AEM wideband. On boosted stuff what I have found is how close to the turbo and where the sensor is installed in the pipe makes a huge difference on sensor life. On the dyno I have had sensors last months and have had cars with horrible bung locations eat up a sensor in a day. They also hate moisture, cold starting e85 cars tend to have more moisture so that doesn't help either.
We run dominators with NTK sensors in everything we race. The sensors do tent to hold up alot better but the location can still effect them. If you do go the HP route I have a used one from a car I upgraded to a dominator I going to sell.
We sell and tune alot terminators and install a few of them but primarily use dominators in everything we build. I can tell you there is a big difference in a hp or dominator over a terminator when it comes to tuning and little glitches.
We run dominators with NTK sensors in everything we race. The sensors do tent to hold up alot better but the location can still effect them. If you do go the HP route I have a used one from a car I upgraded to a dominator I going to sell.
We sell and tune alot terminators and install a few of them but primarily use dominators in everything we build. I can tell you there is a big difference in a hp or dominator over a terminator when it comes to tuning and little glitches.
Thread Starter
Joined: Nov 2013
Posts: 6,389
Likes: 558
From: Portlandia
yeah my e85 car is eating them like candy. i have a terminator on my work truck too and it's been on the original o2 since new, running on gasoline 99% of the time.
I sent you a PM I am definately interested in your HP.
I sent you a PM I am definately interested in your HP.
Teching In
Joined: Feb 2019
Posts: 9
Likes: 0
J1 A26, J3 B8 and B22, and J4 20 are 5v out.
When I tune one with flex I do the main tune on whatever fuel they plan on running mostly. If E85 then I tune on E85 and use the flex for pump that way on E85 it isnt using the sensor basically. It also a good practice to have a tune with no O2 sensor incase it goes out, just load your OL tune and drive home.
When I tune one with flex I do the main tune on whatever fuel they plan on running mostly. If E85 then I tune on E85 and use the flex for pump that way on E85 it isnt using the sensor basically. It also a good practice to have a tune with no O2 sensor incase it goes out, just load your OL tune and drive home.
No don't do that at all. Take your exciter wire and run it to the fuse box and it'll charge the battery. Pin B on the alternator connector with a 470 ohm 1/2 watt resistor inline
Trending Topics
Edit: Old thread and I replied to the wrong question.
I don't know how this stuff really works, I just assumed that three wire sensors use the sensors +5V and IPU ground as a reference for proper sensors signal scaling? In other words, the current draw is very small, and all current leaving the ECM goes back to the ECM. And I think maybe the ECM has internal voltage regulation on those drivers so that it's highly accurate at 5 volts all the time.
But if you want to use it as a power supply for a resistive device, or current does not go back to ECM ground, then I think it needs to be completely separated from the other sensors on one of the custom outputs, correct? I think Holley gives specs for current limits on their custom output.
I don't really know the answer, I'm just asking these questions because it might lead to the answer.
But if you want to use it as a power supply for a resistive device, or current does not go back to ECM ground, then I think it needs to be completely separated from the other sensors on one of the custom outputs, correct? I think Holley gives specs for current limits on their custom output.
I don't really know the answer, I'm just asking these questions because it might lead to the answer.
Last edited by QwkTrip; Jun 29, 2023 at 07:59 PM.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
