Gen 3 P01 injector size limit?
Thread Starter
Joined: Aug 2011
Posts: 4,729
Likes: 814
From: Portland, OR
That's about where I'm at with my car and ID1000's at 60 psi base.
But I'm about to tune my buddies car with FIC 1650's.
I'll let you know how it does.
idle could be interesting.
It will be on E85
But I'm about to tune my buddies car with FIC 1650's.
I'll let you know how it does.
idle could be interesting.
It will be on E85
Teching In
Joined: May 2024
Posts: 5
Likes: 1
How is that possible?I have been trying to adjust the 80lb injectors, resulting in a too rich mixture at idle.I have adjusted the Short Pulse Limit to almost 0.00 and the Minimum Fuel Milligrams to 0.Still, the fuel mixture is too rich.When I tried to lean the mixture using the fuel trim via actuator test, the idle got worse.
How is that possible?I have been trying to adjust the 80lb injectors, resulting in a too rich mixture at idle.I have adjusted the Short Pulse Limit to almost 0.00 and the Minimum Fuel Milligrams to 0.Still, the fuel mixture is too rich.When I tried to lean the mixture using the fuel trim via actuator test, the idle got worse.
Trending Topics
Teching In
Joined: May 2024
Posts: 5
Likes: 1
The fuel system is otherwise stock.The car ran without issues with the stock injectors.The new injectors are LS1 style Siemens Deka 80lb.The calibration data has been updated accordingly in HP Tuners. Fuel Delta Min Ince. is set to 0.Various values between the original and 0 have been tested for the Min Fuel Milligrams setting. Several YouTube videos and discussion forums have been reviewed on this topic.However, the instructions are limited to injector data entry, Min Fuel Milligrams, and Fuel Delta Min Incr.I believe the problem lies in other settings, but where?
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
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Fanatic
Joined: Jan 2018
Posts: 1,059
Likes: 198
How is that possible?I have been trying to adjust the 80lb injectors, resulting in a too rich mixture at idle.I have adjusted the Short Pulse Limit to almost 0.00 and the Minimum Fuel Milligrams to 0.Still, the fuel mixture is too rich.When I tried to lean the mixture using the fuel trim via actuator test, the idle got worse.
I also changed the open loop target AFR from 13.6 to 14.7, but I was expecting that alone to just raise my AFR from 12:1 to 13.1. It's actually very close to 14.7 now.
* On second thought, they're actually 3.5x bigger than stock. Close enough I guess.
Teching In
Joined: May 2024
Posts: 5
Likes: 1
Look for a parameter named "minimum trim pulse width" in the Long Term Fuel Trim section. Stock was 1.2 milliseconds for my car. I divided it by 4 since my injectors are about 4x bigger than stock*, and my car stopped running way richer than the tune called for at startup. I'm not certain that was the key thing, but I think it might have been.
I also changed the open loop target AFR from 13.6 to 14.7, but I was expecting that alone to just raise my AFR from 12:1 to 13.1. It's actually very close to 14.7 now.
* On second thought, they're actually 3.5x bigger than stock. Close enough I guess.
I also changed the open loop target AFR from 13.6 to 14.7, but I was expecting that alone to just raise my AFR from 12:1 to 13.1. It's actually very close to 14.7 now.
* On second thought, they're actually 3.5x bigger than stock. Close enough I guess.
The AFR is still set to 14.63.
I was going to mention the min fuel milligrams but he had mentioned it in his post.
Why it's in the transient section I don't know.
When I installed my ID1000's, it was pig rich and nothing helped until I changed mine to .012
Why it's in the transient section I don't know.
When I installed my ID1000's, it was pig rich and nothing helped until I changed mine to .012
Last edited by LilJayV10; May 30, 2024 at 05:12 PM.
TECH Fanatic
Joined: Jan 2018
Posts: 1,059
Likes: 198
The other value thats been discussed is under engine>fuel>transient
TECH Fanatic
Joined: Jan 2018
Posts: 1,059
Likes: 198
This is why I put trim in bold earlier:
