what is the difference between a standard tune and a open loop tune?
what is the difference between a standard tune and a open loop tune? also...can an open loop tune slow the car down in the 1/4mi?
last year my car ran a best of 11.1@123mph. this year i added the fast 90mm intake and a new cam. i gained 24 peek hp and tq and in some spots under 5,000rpm's i gained 33hp. this year the car only ran a best of 11.28@122 in the 1/4mi,this year the car is on an open loop tune. for racing what tune is better open loop or standard tune?
thanks, mike c.
last year my car ran a best of 11.1@123mph. this year i added the fast 90mm intake and a new cam. i gained 24 peek hp and tq and in some spots under 5,000rpm's i gained 33hp. this year the car only ran a best of 11.28@122 in the 1/4mi,this year the car is on an open loop tune. for racing what tune is better open loop or standard tune?
thanks, mike c.
a full open loop tune is where no O2 feedback is used...this sometimes is done if you have a cam with large overlap. Some self tuners do it just to have full control over everything thats going on rather then have a ton of sensors trying to make decisions.
gaining power on the dyno in 1 gear is different then going to the track running through 3 or 4 gears with different conditions from one day to the next. Maybe a head wind that second day who knows...real world is different then a dyno.
Trending Topics
yeah i know,but ganining power i should of gained e.t. i just thought i would look into this new open loop tune that my tuner put into my car to see if that may cause something.
thanks.
thanks.
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
Originally Posted by mike c.
what do you mean done correctly? like i said i gained power at all rpm's,but still made np gain in the 1/4mi in e.t or mph.
meaning if you are commanding the optimum AFR and Timing for max TQ/HP, you won't loose a thing. If your fueling or timeing is not optimal for you combo you will loose power.
Originally Posted by mike c.
yeah i know,but ganining power i should of gained e.t. i just thought i would look into this new open loop tune that my tuner put into my car to see if that may cause something.
thanks.
thanks.
11 Second Club
Joined: Jul 2004
Posts: 123
Likes: 1
From: Sydney, Australia
Its possibly running lean at the track - when it was spot on when on the dyno.
The tune might need to be shifted just 0.3afr points richer.
More power will make it quicker at the track in good weather.
My baby cammed car is tuned in open loop using EFIlives custom operating system.
It has done 11.619/116 mph 1.583 off just a 3600 stall and 3.73s at a race weight with me in it of 3625lb
Its also getting 30mpg at 70mph cruise.
The tune might need to be shifted just 0.3afr points richer.
More power will make it quicker at the track in good weather.
My baby cammed car is tuned in open loop using EFIlives custom operating system.
It has done 11.619/116 mph 1.583 off just a 3600 stall and 3.73s at a race weight with me in it of 3625lb
Its also getting 30mpg at 70mph cruise.
