O/L SD help please
Thread Starter
TECH Enthusiast
iTrader: (10)
Joined: May 2013
Posts: 500
Likes: 19
From: Van Nuys, CA
O/L SD help please ok so im not goin to be driving my car much and wanna just run the car on open loop speed density. is there somewhere or someone that can show/tell me how to set up a basic O/L SD tune on my setup?
info on my setup:
2001 5.3l
2000 4l60e
GT500 H122 blower
36lb injectors
vic jr intake
HPTuners
i have no maf and no o2's on my harness.
ive had it running for a little while but it doesnt seem to like it.
i did try searching but it finds sooooo many random things.
info on my setup:
2001 5.3l
2000 4l60e
GT500 H122 blower
36lb injectors
vic jr intake
HPTuners
i have no maf and no o2's on my harness.
ive had it running for a little while but it doesnt seem to like it.
i did try searching but it finds sooooo many random things.
Thread Starter
TECH Enthusiast
iTrader: (10)
Joined: May 2013
Posts: 500
Likes: 19
From: Van Nuys, CA
ok heres what i got. um i tried zeroing out the maf airflow tables and i believe that was when it likes to run a little better.
sorry im a noob to tuning and no im not going to tune this thing myself im just trying to get it driveable so i can take it to get tuned.
sorry im a noob to tuning and no im not going to tune this thing myself im just trying to get it driveable so i can take it to get tuned.
Teching In
Joined: Sep 2012
Posts: 18
Likes: 0
I haven't looked at the tune.. But are you still on a 1 bar factory map sensor? if so you need to upgrade to a 2 or 3 bar. Also im assuming this is the 2001 0411 pcm, if so you need to do a custom operating system to run so you can have positive pressure tables added to the pcm for boost.
If running the car without both of those things will be a disaster.
If running the car without both of those things will be a disaster.
Thread Starter
TECH Enthusiast
iTrader: (10)
Joined: May 2013
Posts: 500
Likes: 19
From: Van Nuys, CA
just curious why i would need a 2 bar map if a 1 bar is good for 14.7psi and im only boosting about 7psi? also ive never heard of anyone having to make a custom operating system. please explain.
ive built 3 boosted cars and never had an issue with needing a custom system. of course they were turbo but its pretty much the same.
ive just never set up a open loop speed density tune.
ive built 3 boosted cars and never had an issue with needing a custom system. of course they were turbo but its pretty much the same.
ive just never set up a open loop speed density tune.
Trending Topics
Teching In
Joined: Sep 2012
Posts: 18
Likes: 0
1 bar is 14.7 Absolute or also known as Atmosphere. to add 7psi on top would mean you need a 2 bar. please see my picture related to this.
as you can see 7.3psi is actually 22psi absolute. So yes you do need a 2 bar if you dont wanna blow this thing apart.
As for custom operating systems, the 0411 PCM's load can only go to 105KPA. you need a COS to go beyond 105KPA for boost. This is referring to EFILive but i would imagine HP tuners also has their own word for COS.
All in all you need a map sensor and a software to correctly scale the sensor and tune the car.
as you can see 7.3psi is actually 22psi absolute. So yes you do need a 2 bar if you dont wanna blow this thing apart.
As for custom operating systems, the 0411 PCM's load can only go to 105KPA. you need a COS to go beyond 105KPA for boost. This is referring to EFILive but i would imagine HP tuners also has their own word for COS.
All in all you need a map sensor and a software to correctly scale the sensor and tune the car.
Last edited by FreshDA9; Jan 4, 2014 at 10:05 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
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
TECH Enthusiast
iTrader: (10)
Joined: May 2013
Posts: 500
Likes: 19
From: Van Nuys, CA
so i found these steps on hptuners website that someone posted. going to try them out and see if thatll work. ordering a 2 bar map here soon.
- multiply Primary VE by 1.15, ( I don’t have secondary VE)
- set “DFCO” to 284˚F ( and I have stall RPM to 925)
- set EQ vs RPM table to 1.13
- set PE table to 1
- set STFT open loop to Disable
- set TFT to Enable
- min ECT to149˚F and Max ECT to 284˚F
- set “closed loop Enable coolant Temp vs. IAT” to 284˚F
- set COT to Disable
- copied high octane table to low octane table
- set MAF fr. To 0
- multiply Primary VE by 1.15, ( I don’t have secondary VE)
- set “DFCO” to 284˚F ( and I have stall RPM to 925)
- set EQ vs RPM table to 1.13
- set PE table to 1
- set STFT open loop to Disable
- set TFT to Enable
- min ECT to149˚F and Max ECT to 284˚F
- set “closed loop Enable coolant Temp vs. IAT” to 284˚F
- set COT to Disable
- copied high octane table to low octane table
- set MAF fr. To 0
Teching In
Joined: Sep 2012
Posts: 18
Likes: 0
I am unsure how HP Tuners does it, EFI Live doesn't use the credit system on Operating Systems they are free.
You can force open loop speed density the way it is now, but you will be stuck to 1 bar and the factory 105kpa operating system. So yes you could get it running and drive-able to get the car to who is doing the tuning.
You can force open loop speed density the way it is now, but you will be stuck to 1 bar and the factory 105kpa operating system. So yes you could get it running and drive-able to get the car to who is doing the tuning.
Thread Starter
TECH Enthusiast
iTrader: (10)
Joined: May 2013
Posts: 500
Likes: 19
From: Van Nuys, CA
yeah thats all i want for now is to be able to roll it around and then get tuned. i have the bypass valve ziptied open so i cant even get into boost if i wanted to.