Tunning A/F question
05-08-03, 02:15 PM
#1
Tunning A/F question
Hey Guys,
I really don't know jack about tunning, so I ask for help! I've heard about tunning A/F's on the street because of load, what exactly do people mean by load?
Another question is, what the perfect A/F's? And I don't mean the numbers, but should the numbers be linear vs the rpm's? or should the increase\decrese vs rpm's?
I would appreciate any info, if not anybody knows books that my answer my questions?
I really don't know jack about tunning, so I ask for help! I've heard about tunning A/F's on the street because of load, what exactly do people mean by load?
Another question is, what the perfect A/F's? And I don't mean the numbers, but should the numbers be linear vs the rpm's? or should the increase\decrese vs rpm's?
I would appreciate any info, if not anybody knows books that my answer my questions?
05-08-03, 03:01 PM
#2
Some people prefer to tune on the street because there is more rolling resistance placed on the car compared to a dyno. This means more accurate tuning.
Some dyno's (ie DynoDynamics and Mustang Dyno's) 'LOAD' up the car to simulate that resistance.
Load in terms of tuning an EMS, is the amount of manifold vacuum or boost you see.
For instance, 100% load on my car is 15 psi, since I'm wastegate limited to that.
Your desired air fuel ratio is dependent on load and rpm.
You will definitely need lees fuel at 5000rpm while cruising than at 5000rpm under boost.
The more load, the more fuel...
Some dyno's (ie DynoDynamics and Mustang Dyno's) 'LOAD' up the car to simulate that resistance.
Load in terms of tuning an EMS, is the amount of manifold vacuum or boost you see.
For instance, 100% load on my car is 15 psi, since I'm wastegate limited to that.
Your desired air fuel ratio is dependent on load and rpm.
You will definitely need lees fuel at 5000rpm while cruising than at 5000rpm under boost.
The more load, the more fuel...
05-09-03, 06:13 AM
#3
Originally posted by eViLRotor
Some people prefer to tune on the street because there is more rolling resistance placed on the car compared to a dyno. This means more accurate tuning.
Some dyno's (ie DynoDynamics and Mustang Dyno's) 'LOAD' up the car to simulate that resistance.
Load in terms of tuning an EMS, is the amount of manifold vacuum or boost you see.
For instance, 100% load on my car is 15 psi, since I'm wastegate limited to that.
Your desired air fuel ratio is dependent on load and rpm.
You will definitely need lees fuel at 5000rpm while cruising than at 5000rpm under boost.
The more load, the more fuel...
Some people prefer to tune on the street because there is more rolling resistance placed on the car compared to a dyno. This means more accurate tuning.
Some dyno's (ie DynoDynamics and Mustang Dyno's) 'LOAD' up the car to simulate that resistance.
Load in terms of tuning an EMS, is the amount of manifold vacuum or boost you see.
For instance, 100% load on my car is 15 psi, since I'm wastegate limited to that.
Your desired air fuel ratio is dependent on load and rpm.
You will definitely need lees fuel at 5000rpm while cruising than at 5000rpm under boost.
The more load, the more fuel...
So how do you tune for cruising vs boost in say a halltec\microtec? Do they have special functions for this? Or is just "practical" to tune for "under boost" and use this map all the time?Thanks for your response!
Anybody else want to chime in?
TIA!
05-09-03, 09:39 AM
#4
Queer
Join Date: Mar 2001
Location: Formerly in the Ass end of the pacific.
Posts: 742
Likes: 0
Received 0 Likes
on
0 Posts
Cruising should be close to 14.7
Full boost should be around 11.5-12.0
You just need to tweak until you get it. No easy way.
Sorry, it's early in the morning Hop onto Haltech's page and DL a demo of the software. It will give the inside look of how to tune things.
Full boost should be around 11.5-12.0
You just need to tweak until you get it. No easy way.
Sorry, it's early in the morning
Hop onto Haltech's page and DL a demo of the software. It will give the inside look of how to tune things.
05-09-03, 02:05 PM
#5
Got Boost?
Hmm, I see. This is actually more complicated than what I thought So how do you tune for cruising vs boost in say a halltec\microtec? Do they have special functions for this? Or is just "practical" to tune for "under boost" and use this map all the time?
So you have to tune everywhere, not just under boost.
05-09-03, 08:08 PM
#6
Originally posted by fatboy7
You can tune for both...... there are usually hundreds of points at which you can tune. Usually there are 15+ load points from heavy vacuum (engine braking) to full boost, that can be tuned for at many different rpms. So like on a map when you are finding a city, which has coordinances (D-2 for instance) EMS's have a "map" that they use to detirmine the amount of fuel to add. (15psi - 4500rpm), is an example of the coordinances that would be used.
So you have to tune everywhere, not just under boost.
You can tune for both...... there are usually hundreds of points at which you can tune. Usually there are 15+ load points from heavy vacuum (engine braking) to full boost, that can be tuned for at many different rpms. So like on a map when you are finding a city, which has coordinances (D-2 for instance) EMS's have a "map" that they use to detirmine the amount of fuel to add. (15psi - 4500rpm), is an example of the coordinances that would be used.
So you have to tune everywhere, not just under boost.
I guesss I need to pick a good book in FI!
Thread
Thread Starter
Forum
Replies
Last Post
t-von
3rd Generation Specific (1993-2002)
9
09-10-15 01:56 PM
Nosferatu
2nd Generation Specific (1986-1992)
7
09-05-15 02:13 PM
